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Engine Specific Info and Questions => IDI Engine => Topic started by: 8v-of-fury on January 26, 2009, 06:58:09 pm
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I know that decreasing the resistance of the exhaust increases the over all efficiency of the engine and such. lol
Does that mean that in all good theory, by adding like race headers to a diesel, and then opening up the intake real good, would make for some good power gains and lower egt?
ALSO where is the best place to get 8v headers? they will be the same as the 8v gassers correct?
Seems like this may definitely be something i will be doing in the future.. maybe :)
So say for this header from Techtonics Tuning:
http://www.techtonicstuning.com/showpart.asp?partnum=251.242
it says 1.75 in.. does that mean each in dividual runner is 1.75in? what is the diameter of the pipe after they come back to one? Anybody else run headers on a diesel?
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nice, but, uh, where does the turbo go :?:
:P
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I have an N/a, Guess i should have mentioned that eh? lol
Do you figure it would make a good improvement on an N/a engine? I mean headers are as nonrestrictive as they get right? LOL Plus you can tell people yeah my diesels got headers. lol
Anyone else ever do this to an n/a?
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Is this on a MK2? If it were mine I would find a dual outlet manifold/ downpipe from a gas car and go with that. I don't think there is much difference in flow between it and headers. You would also have the reliability of an OEM piece, headers are prone to cracking. Couple that with a nice exhaust system and you should get a nice little bump in power. 8)
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X2 on what Cyrus said... Headers are more trouble than they are worth IMHO... You'll probably be able to find the decent manifold for less $$$ and have alot less headaches...
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for the price of headers you might as well just turbo your N/A with a VNT, and enjoy even more power than they would deliver, and wayy more fun :twisted:
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Yes the 1.75 are the primary tubes. I have never put headers on a diesel so I don't know what the gain is, but the only reason I hated them on a gas engine is it made it hard as can be to get to the spark plugs. You shouldn't have that problem LOL. I did put a 2.25 inch exhaust on my NA and a custom intake and actually had to let off on the interstate. Before it was so gutless that I would floor it and let the hills keep me at about 65 MPH. After I did all the work to the engine I was headed to work looked down and I was doing about 83MPH.
IMHO If you want to do it I bet you would see gains, wonderful if you could make your own, so so if you had to buy the 400. some dollar one.
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I have a 16v dual exhaust manifold let me know if you want it..
I think a good manifold would be more noticeable on a NA diesel...vs a TD
but the gains would be very minimal either way...
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for the price of headers you might as well just turbo your N/A with a VNT, and enjoy even more power than they would deliver, and wayy more fun :twisted:
X2
3X ;-) You'll get more of an increase in efficiency and power with the turbo than a header. Do you have access to a TIG welder ? You could make your own stainless steel header with 304 SS and not worry about cracks, or make you own 3" or 2.5" SS down pipe for a turbo if you go that route.
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So.... speaking of headers.
Anyone know of a manufacture that DOES make a Tube Header for a Turbo Diesel?
I have seen pictures of them, here and there, but never found out who made them.
// End of thread Hijack //
:D
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So.... speaking of headers.
Anyone know of a manufacture that DOES make a Tube Header for a Turbo Diesel?
I have seen pictures of them, here and there, but never found out who made them.
// End of thread Hijack //
:D
Dave (935racer) made some. i'm sure his tubular manifold wouldn't be cheap (made for a turbo). port & polishing, as well as polishing the N/A intake system, and a nice free flowing exhaust should wake up the motor.
but it won't be anything like an N/A with a VNT & conservatively fueled engine. good vnt turbo's (with manifold) can be had for about $300. they work well in the mk1 application with the ALH manifold, but not in the mk2/mk3 as the rear mount gets in the way. i suppose a custom mount could be made so the turbo can clear it though... really does make things easier when you don't need a turbo flange :wink:
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Those 935racer tube turbo manifolds were works of art. I don't need, I want!
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Is this on a MK2? If it were mine I would find a dual outlet manifold/ downpipe from a gas car and go with that. I don't think there is much difference in flow between it and headers. You would also have the reliability of an OEM piece, headers are prone to cracking. Couple that with a nice exhaust system and you should get a nice little bump in power. 8)
If this is the direction the OP wants to go, I have a Rabbit dual outlet manifold and downpipe I'd be willing to cut a deal on. I don't own a transverse VW, so it's practically useless to me. :D
Both are rusty, but no holes except the ones that are supposed to be there!
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Does anyone know if a 16v dual outlet manifold will fit an 8v n/a diesel head? If so, Turbine we may have a deal in progress :) lol
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no only 8v stuff will work on the diesels, i heard a n/a 1.6 with a exhuast the other day...sounded really cool actually...
the good thing about n/a is the instant torque they produce.....its a different driving experiance...
i think if you were to do a few tweaks it would make it a much better (to drive) engine
plus it would be good to see/hear of tuned n/a...and it would be a different from everybody else...
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no only 8v stuff will work on the diesels.
8v only is true. this might work but you may need to grind some metal to clear the intake flange. pic is mk4 AEG manifold. [header look-a-like] (http://i304.photobucket.com/albums/nn184/dieselwagen/aeg20manifold.jpg)
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no only 8v stuff will work on the diesels, i heard a n/a 1.6 with a exhaust the other day...sounded really cool actually...
the good thing about n/a is the instant torque they produce.....its a different driving experience...
i think if you were to do a few tweaks it would make it a much better (to drive) engine
plus it would be good to see/hear of tuned n/a...and it would be a different from everybody else...
yeah, i don't need the power of a TD.. yet loll. I'm a teenager trying to make some head way in life.. i want economy! loll plus the N/a's are like the simplest engine known to mankind :P All you need is two wires, a battery and diesel.. and your good to go! loll I just love how self sufficient they are.
*** eh? only 8v stuff eh.. figures.. sorry turbine.. no deal :P HMM what about taking the original manifold and for lack of better words "porting and polishing" the inside of it, and making a bigger opening and then running a good size pipe all the way back?
Also, if you don't mind i have some questions about the use of a muffler. Some people claim that an N/a is loud with no mufflers. I don't see how this could be true, because I have my diesel engine on a stand and running straight from the manifold.. and it's not loud.. Even holding a 2 foot piece of pipe up to the manifold quiets down like 40% of the noise.. so if your running straight pipe all the way back.. how could it be loud? So my question is, will running straight pipe harm the engine the same way it would a gasser? do diesels need back pressure? I have heard of guys running big 7.3 fords straight pipe. Are they just dumb? lol No muffler would make doing a side dump alot easier. LOL
Thanks.
8v
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No deal? I'm the one with the 8v manifold I'm trying to sell you... it came off a diesel. :lol:
The diesel camshafts have no overlap to them, so big, wide open exhausts can only be your friend.
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no only 8v stuff will work on the diesels, i heard a n/a 1.6 with a exhaust the other day...sounded really cool actually...
the good thing about n/a is the instant torque they produce.....its a different driving experience...
i think if you were to do a few tweaks it would make it a much better (to drive) engine
plus it would be good to see/hear of tuned n/a...and it would be a different from everybody else...
yeah, i don't need the power of a TD.. yet loll. I'm a teenager trying to make some head way in life.. i want economy! loll plus the N/a's are like the simplest engine known to mankind :P All you need is two wires, a battery and diesel.. and your good to go! loll I just love how self sufficient they are.
*** eh? only 8v stuff eh.. figures.. sorry turbine.. no deal :P HMM what about taking the original manifold and for lack of better words "porting and polishing" the inside of it, and making a bigger opening and then running a good size pipe all the way back?
Also, if you don't mind i have some questions about the use of a muffler. Some people claim that an N/a is loud with no mufflers. I don't see how this could be true, because I have my diesel engine on a stand and running straight from the manifold.. and it's not loud.. Even holding a 2 foot piece of pipe up to the manifold quiets down like 40% of the noise.. so if your running straight pipe all the way back.. how could it be loud? So my question is, will running straight pipe harm the engine the same way it would a gasser? do diesels need back pressure? I have heard of guys running big 7.3 fords straight pipe. Are they just dumb? lol No muffler would make doing a side dump alot easier. LOL
Thanks.
8v
take the car on the highway, and then tell me it's not loud... the drone should change your mind... especially at 3000 rpm... :lol:
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Yup under load through the rpms there are a couple different rpm ranges that are very loud. Run the dual DP maniwith a good downpipe from TT and 2.25 pipe with a Dynomax super turbo. Got this on my dads rabbit but it is a 2" kit.
get this kind of mani:
http://www.techtonicstuning.com/images/parts/251.101.jpg
And depending on what gen car you have:
http://www.techtonicstuning.com/images/parts/251.222.jpg MKI
http://www.techtonicstuning.com/images/parts/251.204S.jpg MKII
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@ Turbine, you said in your IM that the Mani was a 16v! lol Get your stuff straight man! Im sent back to you.
I didn't seem to think of when the engine was under load :P That would make quite a mean noise eh!? Soo no cam overlap means you can run as big and as non restrictive as your heart desires :) theoretically. lol
So then, if I were to get a dual mani, and the required dp.. then run 2.25 pipe back to a cherry bomb (glasspack) i should have a good sounding and very free flowing exhaust system!
$491 for the set from Techtonics.. Pricey.. lol What about widening the opening of the current single manifold and making a bigger Dp? for a cheap solution for starting with, so i can gain some cash to buy the TT set up maybe?
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Turbocharge it.
You will do it eventually anyway, so easier just to do it right away and save all the money that would be (wastefully) spent on the N/A.
Sure, you can improve the N/A, but after a while you'll get hungry for more power and then only turbo can provide...
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oh dearest TurboJ... :lol:
I wish to make this one bad mofo of an engine, and will probably if the time and money is right turbo it with a good ol' fashioned Vnt setup. :)
BUT sadly for now and all the crap going on for me, it will stay a sad little sack of N/a poopy lol
but definetly.. i am already power hungry :) my other car is a '67 cougar; 4 speed, 300 horse 302 ford small block.. Yeah i have the need for power! lol
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Here's my car when it was an NA, with a 2" straightpipe from the turbo back. I thought it sounded kinda ricey and crappy...might be cool if the car had upwards of 250whp, but...
The reason the rpm's are hanging in between shifts was due to the governor mod, which I quickly undid.
http://www.youtube.com/watch?v=NNM1LDTJ0ys
And here it is with an open manifold...loud as hell.
http://www.youtube.com/watch?v=ZS7lUIbyHg8
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Man it sounds like a BAMF straight off the DP! I love it.. When i do my swap i wont try and squeeze the exhaust in to the swap date. I will live a week with it loud as freakin hell! But dayyyyyummm it sounded good! nice lookin car
you score 10/10! :lol:
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I have installed headers on two of my n/a diesels in the past (I still drive one today). It does make a difference, especially on the highway. The headers are Pace Setters, from JC Whitney, cost was 110.00 great fit and did not crack. Add a flex-joint and a cherry bomb or glass pack type muffler with 2.5" piping, and enjoy.
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I have the original 8V GTI exhaust (including manifold) on mine, and it's pretty good on the highway. Hills kill it still, but on the flat, it can maintain 75mph fairly easily which is a lot better than other similar horsepower gasoline cars that I've owned.
Z
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I think it would work great. I would also add that if you take that stock airbox and cut a hole in it and run some 3 or 4 inch pipe with the header it will do wonders. The best thing I did with my na was put 3" into the airbox and turn up the fuel a little. With the stock 4 speed I could do 85 on SR 30 going to canton easily. I also had 2.5" all the way back with glass packs for mufflers.
The first time I realized that I could do 85 was by accident. Before I would floor it and the hills would keep me in the legal speed range of 65-70 MPH. Doing the same thing I didn't even realize it until I looked down "holy sh!!" It was fun to drive.