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Engine Specific Info and Questions => IDI Engine => Topic started by: Doakster on September 07, 2009, 07:00:08 pm
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I looked up the specs for my trans and the ecodiesel has a .745 fifth gear with a 4.250 final drive.
Does anyone sell a taller gear than that?
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not really, but there is an alleged .68 fifth gear set floating around out there somewhere. you need to change your final drive ratio honestly tho, cause .75 is pretty high already. but the final drive is really low.
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the 1980-1984 FF, FO and FN transmissions had a .71 5th gear. Autotech sells a .71 5th kit as well. Not cheap though.
The bad news on the FF, FO and FN transmissions is that they won't bolt into your ECODiesel. The gearset will, but the transmission will not.
I think the bigger problem is the high final drive. That's higher than any stock VW trans. It's a desirable transmission, but if you want MPG, you'll want to go down to 3.89 or 3.91. You can try a 3.67, but I generally find the cars get doggy with the 3.67.
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i have 3.67's in my rabbit in an AUG trans. everybody told me to avoid an aug like the plauge, but i had a free low miles trans, so i used it, and boy im glad i did. it might not have a very high fifth gear (.89) but it sure is fun to drive. i get great mileage also. and its so nice having a GTI feel with the close ratio trans, it keeps the turbo spooled alot better than the old GC 4 speed did.
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the 1980-1984 FF, FO and FN transmissions had a .71 5th gear. Autotech sells a .71 5th kit as well. Not cheap though.
The bad news on the FF, FO and FN transmissions is that they won't bolt into your ECODiesel. The gearset will, but the transmission will not.
I think the bigger problem is the high final drive. That's higher than any stock VW trans. It's a desirable transmission, but if you want MPG, you'll want to go down to 3.89 or 3.91. You can try a 3.67, but I generally find the cars get doggy with the 3.67.
and why would an ff,fn or fo not bolt to an ecodiesel? i was under the impression that a VW trans bolts to any VW 4 cylinder with the appropriate clutch and flywheel? what makes it not fit the eco-diesel?
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It will bolt to the Eco-Diesel no problem. You just won't be able to bolt it into a MKII chassis. ;) FF, FN, and so on are MKI boxes that only have the provisions for MKI motor mounts.
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sell the ecodiesel trans to a racer and get an ACH or AGS trans. You'll like it a lot better.
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the 1980-1984 FF, FO and FN transmissions had a .71 5th gear. Autotech sells a .71 5th kit as well. Not cheap though.
The bad news on the FF, FO and FN transmissions is that they won't bolt into your ECODiesel. The gearset will, but the transmission will not.
I think the bigger problem is the high final drive. That's higher than any stock VW trans. It's a desirable transmission, but if you want MPG, you'll want to go down to 3.89 or 3.91. You can try a 3.67, but I generally find the cars get doggy with the 3.67.
I looked on Autotech site, but i only see that they sell a .72 5th gear for 02A/02J transmissions. Here's a link.
http://www.autotech.com/prod_drive_gearconv.htm
I'll be talking to a local VW performance shop near me to get a price on a trans rebuild with a peloquin limited slip and possibly see what they can come up with for a 5th gear.
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i have 3.67's in my rabbit in an AUG trans. everybody told me to avoid an aug like the plauge, but i had a free low miles trans, so i used it, and boy im glad i did. it might not have a very high fifth gear (.89) but it sure is fun to drive. i get great mileage also. and its so nice having a GTI feel with the close ratio trans, it keeps the turbo spooled alot better than the old GC 4 speed did.
I generally eschew the use of a 3.67 in a 1.6 unless you've got a turbo with LDA to push it in 1st, 5th and reverse. 2nd thru 4th are fine in any trans, but the 3.67 with a low power motor makes takeoffs and reversing a little hard with a 1.6NA. Also, you need the power to accelerelate in 5th if you've got a .75 or .71 and a 3.67 R&P. Otherwise, you'll do alot of downshifting to pass on the highway in 5th gear.
A stock ECO, despite having a turbo, is still light on power. Unless the cat's been ripped out and an LDA pump installed, it's still limited in power. It might work. I've never tried it. But, if you could find an ACH, AGS or AOP and add a .71 5th (since he's having the trans rebuilt anyways), then that would be ideal for a stock ECO (in my mind). The original 1.6TDs sold in the Jettas had those transmissions and they hauled a$$.
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i have 3.67's in my rabbit in an AUG trans. everybody told me to avoid an aug like the plauge, but i had a free low miles trans, so i used it, and boy im glad i did. it might not have a very high fifth gear (.89) but it sure is fun to drive. i get great mileage also. and its so nice having a GTI feel with the close ratio trans, it keeps the turbo spooled alot better than the old GC 4 speed did.
I generally eschew the use of a 3.67 in a 1.6 unless you've got a turbo with LDA to push it in 1st, 5th and reverse. 2nd thru 4th are fine in any trans, but the 3.67 with a low power motor makes takeoffs and reversing a little hard with a 1.6NA. Also, you need the power to accelerelate in 5th if you've got a .75 or .71 and a 3.67 R&P. Otherwise, you'll do alot of downshifting to pass on the highway in 5th gear.
A stock ECO, despite having a turbo, is still light on power. Unless the cat's been ripped out and an LDA pump installed, it's still limited in power. It might work. I've never tried it. But, if you could find an ACH, AGS or AOP and add a .71 5th (since he's having the trans rebuilt anyways), then that would be ideal for a stock ECO (in my mind). The original 1.6TDs sold in the Jettas had those transmissions and they hauled a$$.
That is one thing that worries me, having to tall of a gear and no power to push it in 5th gear, heck i have a hard enough time passing people on the highway as it is. But to throw another thought out there, I'm doing some other work to the car while the trans is out. New injectors from Giles are on there way, and i'll be putting a 2.5 in DP and exhaust in. At some point in the future i'm going to converter to a Giles built LDA pump. So I think i may be good on the power at that point. I could always try and find a used 3.941 final drive set and install it on the rebuild, at that point it would be the same trans/specs as an AGS, AOP, but that would probably cost me more money and time then i want to spend.
You really think a .71 5th gear would be too much for the ECO? I still can't find anyone that sells one.
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Another questions for you fellas.
The AVX (ECO) has the following gears.
3.455/1.944/1.286/.909/.745 Final Drive 4.250
The AGS has the following gears.
3.455/1.944/1.286/.909/.745 Final Drive 3.941
So the only difference between the two is the final drive which will essentially still lower rpm over all but will have the same gearing between each gear, correct?
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no, each gear will be slightly longer, because of the longer final drive ratio.
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Doakster,
I have been there, I had an AWY in my NA Jetta. (3.94,3.45,1.94,1.44,1.13,.89)
First I had a FF put into a 4S MKII case (3.89,3.45,1.94,1.29,.97,.80)(the 4S was trashed).
With the FF it was decent, but the .80 was not tall enough for the 70 mph interstates.
I put a .71 5th in. (purchased from www.brokevw.com, GREAT transaction and support).
The car is very good at highway speeds now, the only drawback to this setup is the large jump from 4th to 5th.
I would recommend this setup for anyone who had lots of highway in their driving and doesn't want to try a 3.67r&p.
If I ever have to do another tranny for this car I am going to look for an ACN.
VelocityConservation
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Doakster,
I have been there, I had an AWY in my NA Jetta. (3.94,3.45,1.94,1.44,1.13,.89)
First I had a FF put into a 4S MKII case (3.89,3.45,1.94,1.29,.97,.80)(the 4S was trashed).
With the FF it was decent, but the .80 was not tall enough for the 70 mph interstates.
I put a .71 5th in. (purchased from www.brokevw.com, GREAT transaction and support).
The car is very good at highway speeds now, the only drawback to this setup is the large jump from 4th to 5th.
I would recommend this setup for anyone who had lots of highway in their driving and doesn't want to try a 3.67r&p.
If I ever have to do another tranny for this car I am going to look for an ACN.
VelocityConservation
Man I'm not digging the big jump from 4th to 5th you're talking about. I do a far amount of highway but not a tremendous amount. Maybe I'll just stick with my regular old AVX
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If you're doing the mods, then I think a 3.67 will work on the ECO. It's hard to say how you'll like it until you try it.
The 7A, AOP or AGS is what came in the stock 1983-1986 US-spec Turbo diesels with the LDA. They were a good match for that motor (3.94 R&P and .75 or .71 5th).
If you to go on the cheap (i.e. not rebuild), then just buy one of those transmissions. They are a bit hard to find, especially the 7A.
I think with the mods you'll be doing, the .71 would be fine with a 3.89 or 3.94 R&P. That will keep you in power on the highway. A .71 with a 3.67, I'm not so sure...
If you're committed to rebuilding, then I'd say just drop a 3.89 or 3.94 final drive in there and keep your AVX gearset. If you find you want to drop the RPMs even more on the highway, then you can source a used .71 and swap it in yourself on the car. If the shop that is rebuilding your trans is VW specialists, then I'm sure they'd swap you for the 4.25 AVX R&P. If you find you have to buy an R&P, then be sure to keep the 4.25 one, to sell on VWVortex. Those turds are always looking for those gearsets. I've had meatheads want me to pull the ring and pinions out of good transmissions and sell them to them for beans.
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personally, i like the high ring&pinion with the low trans gears. but then again, i like shifting.
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Well fellas, I got another option.
Thanks to Ilikevwdiesel (Scott), i just talked to another local trans builder. Turns out he might have a AGS trans which i could have rebuilt, or I he's going to try and find a .71 fifth gear.
So these are my most logical options:
1. Swap my AVX out for an AGS, the way the builder described it was the car over all will be a little more sluggish, but I'll get a little lower RPM as a whole. And with the few build ups that i plan on doing to the motor it would be a pretty nice set up. I just ordered a 2.5 downpipe and exhaust from techtonics so that is going on when the trans goes back in. Rebuilt Giles injectors are going in and eventually a Giles IP.
2. Rebuild my AVX and install a .71 5th gear. There will be a noticeable jump between 4th and 5th on this one he said. I'll still do the same engine mods with this set up though. I'm actually leaning toward this set up because once the mods get done, i would think i should be able to pull through any bigger jump from 4th/5th with the added power.
Thoughts about either trans set up with the mods i'm going to do?
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If the costs are the same, I'd go with the AGS with a .71 5th.
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Find a 4K or an AWY, then get a .71 5th and BOOM amazing trans.. You'll be able to keep the engine in the power band all through out the 4 in town gears (1st 2nd 3rd and 4th) and be able to keep the revs done, whilst near the torque band for highway economy and passing ability!
Assuming a tire size of 185/65/14 and the 3.94 Final drive with the .71 5th gear, you will be able to turn 2400 rpm's at 60 mph on the highway. Doing the limit and good economy :) however it will still make good power all the way up to 3500, which will put you near 87mph :D
You would have awesome power in town, and amazing cruising ability! I have the 4K in my Gasser right now with a tach, and i can turn 2300 in 4th in town doing 60 kph or roughly 36 mph. HOWEVER there will be a HUGE jump from fourth (1.13) to fifth (0.71) which isn't really a big deal.. means you just gotta take fourth to about 3500 rpm's or about 55mph. And then not shove it back down in to fourth on the highway EVER lol Really simple if you ask me.. It will make the diesel feel sporty in town for sure.
It's what I am going to do when I get my N/a in my car, put a .71 in my 4K :)
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Yes the AGS with a .71 5th will be optimal.. it will be slow as all hell on an N/a you will feel like you are driving a RIG! lol
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Another questions for you fellas.
The AVX (ECO) has the following gears.
3.455/1.944/1.286/.909/.745 Final Drive 4.250
The AGS has the following gears.
3.455/1.944/1.286/.909/.745 Final Drive 3.941
So the only difference between the two is the final drive which will essentially still lower rpm over all but will have the same gearing between each gear, correct?
If you're interested, I have an ACH out of an 85 Jetta NA and an AGS out of an 86 Jetta NA. And in my 85 Westy Golf I'm running an ACH-hybrid with the 0.71 fifth from an FF rabbit. That gearing puts me at 2500 RPM at a *GPS confirmed* 60 MPH. I also have a buddy with a NA using a 9A-hybrid (3.67 R&P coupled with 0.71 fifth). Both work out great for interstate cruising and very manageable even without a turbo. I've been getting 52 mpg on the interstate!
I can sell you one of these transmissions for $125. I highly highly recommend getting rid of your AVX with that R&P and selling it to an auto-crosser. I'm sure they'd love to have it.
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125 bucks is a damn good deal for a tranny! especially with a .71 already installed.
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Sorry, I wasn't clear...I'm not parting with my modded ACH tranny. I have two extra ones: stock AGS and stock ACH. $125 for either.
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Thanks for all the input fellas, I'm actually dropping the trans off to the rebuilder tomorrow, I talked to him today and he has an AGS available, but his suggestion was to .89 fifth gear in it so that it wasn't such a dog in fifth gear, really though that would go against what I'm trying to do with getting lower RPM in 5th. Plus i don't really want to mess with adapting the reverse switch although i'm sure it isn't too hard.
I actually do like how peppy the AVX is, just not the high rpm of the 5th gear. He also said that the used .71 fifth gears that he has are for a smaller shaft size and won't fit on the AVX shafts.
So i'm at a cross roads. And i think ultimately I am going to stick with the AVX, if i can't do the .71 5th gear now than I may end up doing while the trans is back in the car if I can ever find one.
I even called Brian at brokevw, he doesn't have a .71 available right now.
I'm gonna talk it over with the builder tomorrow again when i see him.
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dude...you're going at this from the wrong angle. Do you know why VW put a 4.25 to 1 ring and pinion in the ECOdiesel Jetta? Because the engines are DOGS! If you increase the power output of the engine you won't have to mess around with building a transmission you can just use an as is AGS, ACH, 4S, or AOP trans with a 3.94 to 1 ring and pinion. If you get a bigger engine like an AAZ, you can use a Mk3 gasser trans with a 3.67 to 1 ring and pinion and turn even less RPM on the highway. Now on the other hand, if you are going to race keep the AVX trans and put a 9A gearset in it. If you want to run better, increase the power and decrease the RPM drop between shifts. Go to scirocco.org/gears and compare the gearsets on the various boxes.
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dude...you're going at this from the wrong angle. Do you know why VW put a 4.25 to 1 ring and pinion in the ECOdiesel Jetta? Because the engines are DOGS! If you increase the power output of the engine you won't have to mess around with building a transmission you can just use an as is AGS, ACH, 4S, or AOP trans with a 3.94 to 1 ring and pinion. If you get a bigger engine like an AAZ, you can use a Mk3 gasser trans with a 3.67 to 1 ring and pinion and turn even less RPM on the highway. Now on the other hand, if you are going to race keep the AVX trans and put a 9A gearset in it. If you want to run better, increase the power and decrease the RPM drop between shifts. Go to scirocco.org/gears and compare the gearsets on the various boxes.
I know most of you guys are shying me away from the AVX rebuild. I realize they had to put a shorter ring and pinion to compensate for the lack of power of the eco, but I also like the way the trans shift because most of the gears are closer.
I'm not going to go crazy on power with this motor, or swap a bigger motor in the car, I'm simply going to add an exhaust, built pump and maybe an intake.
I was surprised when George suggested to put a .89 fifth in the AGS if he rebuilt the AGS for me, because that really wouldn't gain me much in fifth. What ever trans i get, regardless of he condition, it's going to get rebuilt with a peloquin. I'm not going to have the trans out and not get it done while i can. Call me crazy for not doing it cheaply, but that's what i want.
I'm going to talk it over with George tomorrow and see if we can finalize something. Bottom line is that even though it isn't critical that this car gets back on the road, I want it back on the road in a few weeks and if I end up keeping the AVX and maybe doing a .71 5th in the future then i can live with that.
I did do the calculators and you're right, the 3.94 will drop the rpm more than putting a .71 in the AVX, the 3.94(.75 fifth) drops it about 220rpm @ 65mph, while the 4.25 w/.71 fifth only drops it about 160rpm @ 65mph, in comparison to the original 4.25(.75) AVX setup.
And actually Georges suggestion of the AGS with a .89 fifth comes out to be 274 rpm higher than the original AVX set up, so that's not going to work.
So how about this idea, have George swap a 3.94 final in my AVX, then i would have the same exact set up as an AGS and i wouldn't have to alter my reverse switch. I would be a little more doggy of course but all the more reason for me to put an LDA pump on it.
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dude...you're going at this from the wrong angle. Do you know why VW put a 4.25 to 1 ring and pinion in the ECOdiesel Jetta? Because the engines are DOGS! If you increase the power output of the engine you won't have to mess around with building a transmission you can just use an as is AGS, ACH, 4S, or AOP trans with a 3.94 to 1 ring and pinion. If you get a bigger engine like an AAZ, you can use a Mk3 gasser trans with a 3.67 to 1 ring and pinion and turn even less RPM on the highway. Now on the other hand, if you are going to race keep the AVX trans and put a 9A gearset in it. If you want to run better, increase the power and decrease the RPM drop between shifts. Go to scirocco.org/gears and compare the gearsets on the various boxes.
I know most of you guys are shying me away from the AVX rebuild. I realize they had to put a shorter ring and pinion to compensate for the lack of power of the eco, but I also like the way the trans shift because most of the gears are closer.
I'm not going to go crazy on power with this motor, or swap a bigger motor in the car, I'm simply going to add an exhaust, built pump and maybe an intake.
I was surprised when George suggested to put a .89 fifth in the AGS if he rebuilt the AGS for me, because that really wouldn't gain me much in fifth. What ever trans i get, regardless of he condition, it's going to get rebuilt with a peloquin. I'm not going to have the trans out and not get it done while i can. Call me crazy for not doing it cheaply, but that's what i want.
I'm going to talk it over with George tomorrow and see if we can finalize something. Bottom line is that even though it isn't critical that this car gets back on the road, I want it back on the road in a few weeks and if I end up keeping the AVX and maybe doing a .71 5th in the future then i can live with that.
I did do the calculators and you're right, the 3.94 will drop the rpm more than putting a .71 in the AVX, the 3.94(.75 fifth) drops it about 220rpm @ 65mph, while the 4.25 w/.71 fifth only drops it about 160rpm @ 65mph, in comparison to the original 4.25(.75) AVX setup.
And actually Georges suggestion of the AGS with a .89 fifth comes out to be 274 rpm higher than the original AVX set up, so that's not going to work.
So how about this idea, have George swap a 3.94 final in my AVX, then i would have the same exact set up as an AGS and i wouldn't have to alter my reverse switch. I would be a little more doggy of course but all the more reason for me to put an LDA pump on it.
that's a good idea, then you'd have a ***in trans and all you'd have to do is get a good pump and a straight exhaust and you'd run a lot smoother. sell the AVX ring and pinion on the vortex for big bux to a racer.
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that's a good idea, then you'd have a ***in trans and all you'd have to do is get a good pump and a straight exhaust and you'd run a lot smoother. sell the AVX ring and pinion on the vortex for big bux to a racer.
Yup i think it all just came together, mostly thanks to you guys and your suggestions, gonna talk it over with George tomorrow, and persuade him to do so, hopefully he has a 3.94 final.
So what can i sell a 4.25 for?
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Doakster,
I think you are on the right track. Although I think I would go with the 3.89 R&P instead of the 3.94. Not much difference in final but every little bit of RPM you can take out of cruising speed goes right to longevity.
Plus a 5th gear swap can be done "in the car".
I did mine on "out of the car" but it was not that difficult with "BrokeVW's" instructions.
VelocityConservation
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I should have all my parts this week, so next hopefully next Saturday I'll be watch/helping the guys who's rebuilding my trans. Going to go with the 3.94 final and .71 fifth gear later on if needed.
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the thing with short gear transmissions and our cars is that our engines red line at a low speed so the benefits of the short ratios aren't as productive with our cars, especially when you have a turbo
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Trans is back together with all new seals, a peloquin and 3.94 final. Also painted it machine gray. Going to try and get it back in the car tomorrow. Thanks for all the input fellas.
And thanks to Scott for sending me to George, what a stand up guy. I watched him reassemble the trans and learned a thing or two.
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crap, I've got a 4S sitting in my barn that I'd have gladly traded for a AVX... :'(
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crap, I've got a 4S sitting in my barn that I'd have gladly traded for a AVX... :'(
agreed, the AVX is 'gold' to auto-x. Usually they will trade 2 good gas trannies for each AVX,
I use .71's out of older "A1" trannies, and really like a 9A w/ .71 for GTD driving, but I use ACN / AGS (Gas stock) for 'flatlander' 1.6 NA's or TD's in the mtn.
I would change the Eco Turbo to a 'larger' 1.6 turbo + an IP with Boost. Should be able to find a package deal for under $500.
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Any idea what you guys think i can get for the 4.25 R&P that came out of my AVX
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I have a 1992 EcoDiesel; Giles LDA pump, 2-1/4 in. exhaust, GTD intercooler and injectors, boost controller, stock K14 turbo. I sold the 4.25 R&P, found a .71 top gear and a 3.67 R&P and had http://www.aatransaxle.com/ rebuild it (the trans has worked flawlessly since rebuild 20,000 miles ago). The car was an absolute dog before the mods. It could barely hold 65 mph on even shallow grades. It now runs incredibly and easily pulls the taller gears. It'll smoke a Honda Civic ;D in stop and go traffic and run comfortably all day long at 75 mph on the interstate. And, the best part: I get better mileage than before the mods. City, if I drive sensibly, returns 44-46 mpg. Highway with cruise control (Audivox setup -- love it) set at 65 mph delivers 48-50 mpg. Taller gears as part of other performance upgrades makes good sense. Stock, an Eco would have a tough time pulling taller gears, imo.
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I have a 1992 EcoDiesel; Giles LDA pump, 2-1/4 in. exhaust, GTD intercooler and injectors, boost controller, stock K14 turbo. I sold the 4.25 R&P, found a .71 top gear and a 3.67 R&P and had http://www.aatransaxle.com/ rebuild it (the trans has worked flawlessly since rebuild 20,000 miles ago). The car was an absolute dog before the mods. It could barely hold 65 mph on even shallow grades. It now runs incredibly and easily pulls the taller gears. It'll smoke a Honda Civic ;D in stop and go traffic and run comfortably all day long at 75 mph on the interstate. And, the best part: I get better mileage than before the mods. City, if I drive sensibly, returns 44-46 mpg. Highway with cruise control (Audivox setup -- love it) set at 65 mph delivers 48-50 mpg. Taller gears as part of other performance upgrades makes good sense. Stock, an Eco would have a tough time pulling taller gears, imo.
That's some great feedback. Only thing i did at the same time as the trans mods was a 2 1/4in exhaust. I doubt that will give me much for now but hopefully a MPG or two. Maybe a giles LDA pump in the spring.
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That's some great feedback. Only thing i did at the same time as the trans mods was a 2 1/4in exhaust. I doubt that will give me much for now but hopefully a MPG or two. Maybe a giles LDA pump in the spring.
It's money well spent. Giles knows injection pumps. I also had him do the VE pump on my 12V Cummins powered '91.5 Dodge pickup. HUGE performance gain.
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Your conversation is over my head - I am not getting the gear ratios v. final drive, etc...
I am interested in MPG (not preformance) in my 85 TD Jetta. I have had the car for 14 years and recently lost 5th gear. The trans case is in poor condition so I need to purchase a used trans. I drive a ton at 70 mph. Should I be looking for the AVX for the best mileage? I am on a budget and want to avoid custom gearing.
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an AVX is garbage for mileage. sell it to some racer on the whortex. it has 4.25:1 final drive. you will not get real real good mileage with an AVX. now if you put something with a .71 fifth gear and something besides 4.25's, it would work better. that is the lowest geared trans you could ever get in a stock VW. my AUG has 3.67 final drive gears and does fine on the highway.
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Thanks Kevin. Good info. I have an extra gasser trans and after searching the forum it looks like that might be an option to stick in there. I will check the code see what the ratios look like. lower rpm's will be good for the 'montana super 2 lane' highway driving (70 - 75 mph). thanks
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if you want a really sweet trans, just swap in some 3.94 or some 3.67 final drive gears in there. its already layed out right gear wise, just needs taller final drive.
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if you want a really sweet trans, just swap in some 3.94 or some 3.67 final drive gears in there. its already layed out right gear wise, just needs taller final drive.
And that's exactly what these guys convinced me to do.
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The gas jetta I bought for the sheet metal (I hit yet another deer) has an ASF 5 sp trans. That might work well for highway cruising. The car was not drivable when I got it so I will have to look it over closely before I think about putting it in.
Doakster - are you happy with how things turned out with your trans? And did you find somebody that wanted the AVX? Swaping out the final drive might not be something I can do - I will read up on it this weekend.
Oz
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The gas jetta I bought for the sheet metal (I hit yet another deer) has an ASF 5 sp trans. That might work well for highway cruising. The car was not drivable when I got it so I will have to look it over closely before I think about putting it in.
Doakster - are you happy with how things turned out with your trans? And did you find somebody that wanted the AVX? Swaping out the final drive might not be something I can do - I will read up on it this weekend.
Oz
I actually haven't fired/drove it yet since the trans went back in. I was doing a bunch more parts at the same time for other stuff on the car and forgot a few things, hopefully it will be up and going by the end of next week.
I actually didn't take out the AVX, just swapped the ring and pinion out for a 3.94 ring and pinion, and put it back into. The R&P swap requires a complete tear down of the trans. When i pulled the trans to do my clutch it had a bunch of oil leaks on it, so i decided to put some different gears in there and a peloquin limited slip while it was apart.
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Update:
Trans is back in, after a little bit of a drive here are my thoughts.
1st, 2nd and the lower part of 3rd have decent power, can't really tell much of a difference from the 4.25 ring and pinion.
4th, and 5th have a noticeable decrease in power, but not to much, just have to plan the shifts and rev a little more before the shift. Definitely doesn't have much pulling power on long hills and usually requires a down shift.
RPM sounds to be a little lower, i can't really tell because my ECO doesn't have a tach.
The bad news is i didn't see a mileage increase, in fact a little bit of a decrease, but I have other issues going on with mileage that i'm continually fighting.
If and when i put a Giles pump in, i will probably swap in a taller 5th gear, i think it should be able to handle it fine and drop the rpms a bit more in 5th.
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You may be seeing your 43 mpg drop to 31ish because of the fact that you either need to be on the peddle wasting fuel, or downshifting and revving the piss out of her for more power.. I mean probably not 10mpg worth.. but possibly a good factor.
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You may be seeing your 43 mpg drop to 31ish because of the fact that you either need to be on the peddle wasting fuel, or downshifting and revving the piss out of her for more power.. I mean probably not 10mpg worth.. but possibly a good factor.
The mileage drop occurred some time well before pulled the trans and swapped final drives. I had been driving the car with poor mileage for months before the trans work. Before the trans was pulled i was getting 32-33ish, and after the trans work I'm getting 31.5ish. My mileage battle continues.
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You and me both!! I've got a super tall transmission but my mileage numbers are right around the same as yours. Doesn't seem to make a lick of difference where I tune everything, my mileage is suuuuper consistent. At most I can squeeze an extra 50 km out of a tank by being really easy on it...