VWDiesel.net The IDI, TDI, and mTDI source.
Engine Specific Info and Questions => IDI Engine => Topic started by: jlpst94 on July 24, 2013, 03:34:00 pm
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I'm currently running an EcoDiesel tranny with an AVX code. I looked it up and it's got a .75 5th gear ratio which is one of the taller 020 5th gears. It's still revving too high on the highways for me. Is it possible to swap in a newer TDI tranny or any other tranny? Anyone have any options for this. I'd love to be at 2500rpm cruising at 65-70.
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I guess I shouldn't just ask for the tallest 5th gear because of the different final drives. What are my options to get lower rpms on the highway? The EcoDiesel tranny runs around 3500 at 70mph and I'd love to get it lower
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Pretty much al the other .75 and .71 transmissions (020) cruise 100 (60mph) at 2500-ish.
The AVX has a 4.25 F/D and it shows. Be a good trans for a screamer 16v lol!
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http://www.scirocco.org/gears/
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Just get an FF out of a cabriolet and be done with it.
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Lots of time, effort, and money for a few hundred measly RPM I say, just live with it.
The last tank in my ECOdiesel was 645.3 miles on 14.213 gallons.
That's 85% highway / 15% city.
Still managing mid 40's running 70-75MPH up there around 3500 RPM after all those years and miles.
Car just rolled over 392,000 miles, original engine, original headgasket, original turbo, etc.
I did burn up 5th gear in the original AVX tranny awhile back, but promptly replaced it with another AVX because it is a great transmission and great match for the 1.6TD with the K14.
Those Germans matched that tranny to that engine for a reason...and if you've never driven the combo you can't really say much.
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This is true sir..
Our 1.6TD and 4S trans loves to be above 3000RPM on the highway.. and we squeeze nearly 50 out of it every tank.
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Possibly install some sound deadening or turn the volume up on the pod?
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I guess it is a lot of work but I'd like to get a tranny ready for my next build or if this car fails. Maybe the cabrio tranny is the one to get. Thanks guys
I do get around 50mpg so I shouldn't complain. Maybe a louder stereo is the fix
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I installed a modified passat b3/b4 inner boot on my mk2 and it killed a lot of sound. its a heavy rubber boot that goes under the outer cosmetic boot.
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An 020 swap is an easy afternoon...
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An 020 swap is an easy afternoon...
'ay, but for a few hundred RPM?
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Yep
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Absolutely. If I had an AVX in an ECO I would most certainly swap it out along with the injection pump and the soda straw exhaust...
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I swapped a tdi o2a ctn into my 3. Changed fifth gear from .74:1 out for a 0.658:1 set. Combined with my ctn's 3.164:1 R&P, 110km/h (70ish), is achieved at 2100.
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Absolutely. If I had an AVX in an ECO I would most certainly swap it out along with the injection pump and the soda straw exhaust...
The eco exhaust is at least bigger than an na exhaust.
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Get taller tires.
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That's what I did on the van - works good but it raises all of 'em.
I have a K14 and getting the breadbox rolling up a hill from a dead stop is trickey.
I'm speaking from memory though - I'ts been in rebuild mode for over a year ;D
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Get taller tires.
Is the results the same as changing final drive at same rpm?
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175/70/13 with 3.94 and .71 is 2500 @ 60 - with 3.67 and .71 is 2300
185/70/14 with 3.94 and .71 is 2300 @ 60 - with 3.67 and .71 is 2100
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Aerodynamics aside from bigger tires provided there is no interference in wheel wells, seems much easier than changing the diff to lower rpm.
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There are more significant downsides to larger tires than aerodynamics, most notably the added rotating mass hurts fuel economy during acceleration (similar to added weight in the car) and makes the brakes less effective (similar to added weight in the car). It's a better idea to get close with gearing and fine-tune with small changes in wheel/tire size. When you consider the cost of used larger rims and new tires the cost is more than a good used trans. Swapping a trans is a little more work than swapping 4 tires. The trans you pull out can usually be sold for close to or the same as what you pay for the taller geared one - there are certainly folks who want the close ratios for added pep. Used 13" rims and tires are hard to give away and go bad on the shelf.
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If rotating mass is an issue why are new cars going with bigger and bigger wheels? Why not go the other way?
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The short answer is that cars have gotten heavier to accommodate stricter safety requirements and given two sizes of the same model of tire with the same aspect ratio, the larger size will carry a higher load rating. Heavier cars = bigger tires. Newer cars also have much larger brakes to accommodate stopping both the heavier car and the bigger tires...
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The short answer is that cars have gotten heavier to accommodate stricter safety requirements and given two sizes of the same model of tire with the same aspect ratio, the larger size will carry a higher load rating. Heavier cars = bigger tires. Newer cars also have much larger brakes to accommodate stopping both the heavier car and the bigger tires...
Also the trans final drive is selected with both engine power, vehicle weight and wheels' tire size taken into accommodation. That's why the 2013 passat TDI rides at 70mph @ 2250 on a relatively flat beltway-style freeway and has good power.
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If rotating mass is an issue why are new cars going with bigger and bigger wheels? Why not go the other way?
Those bigger alloy wheels are probably still not that much heavier than our thick gauge steel rims.
I didn't notice any hit in mileage or performance when going from the 175/70/13 to the 185/65/14's on the mk2.