2.8 034 single turbo build. research and development

[8bitwarfare]

Ok i know this is the s4 section but i figured i would get a lot better responses from here. ok first off by no means am i doing this soon. but it definitely will happen. right now i have a 2000 a4 2.8 quattro with the drive by wire atq motor and next spring plan on swapping the 6 speed and whole s4 drive train into it. but my ultimate goal here is to strum up some ideas for the motor. iv been doing a lot of research and plan to get the 034 Motorsports single turbo kit. and am aiming for a reliable 400-500hp. i know i need forged pistons and probably 4 bolt main bearing caps. what im not sure of is if the rods can handle that safely or if i should get new ones as well. and anything else that i might need or that would be worth doing. also another major hurtle is tuning it. i really don't want to do stand alone unless i have no other choice but i was wondering if the s4 wiring harness and ecu would work. another issue is where i would do this at. i live in western pa and the best place i have heard of is up in Connecticut. but anyway iv been gathering ideas for quite some time and even talked to some really cool people down in ocean city for h2oi.

[zillarob]

Uh oh, now you gone done did it!

[disrepos]

Some insights / things to be aware of:

Heater Hose connections to the rear coolant crossover pipe are different, I believe, you'll want to confirm it will work as is, or find an alternative.

Getting and oil line to and from the turbo

No reason why you couldn't run a 2.7T harness and ECU

Go for the Mahle Pistons

Not sure if the rods are different, with S4 being stronger. If so, I have a couple spare sets of OE rods. Also have a spare APB block all machined and ready to go for 81.5mm, and many other engine parts if you need any when the time comes.

Good luck on the build. Sounds like a nice conversion.

[8bitwarfare]

Ok I wasnt aware of the heater hoses. Ill definitely have to look I to that.

And as for the oil lines I was thinking of taping in right by the oil filter in the cooler block for the feed and drill and tap a hole somewhere in the pan for the return.

Ok that would make it a lot easier to get it tuned I think. As there would be a lot more people familiar with it.

I believe the rods are the same. From what iv seen the only confirmed differences in the block are the pistons, bore, oil lines, 2 bolt main caps. But the block is drilled for 4.

thank you ill definatley keep that in mind but for right now my first step is finding a salvaged s4 doner car for parts ccause ill be needing a lot of them.

[AudiA4_20T]

this won't happen

[mikeb17]

this won't happen

As much as I'd like to see it happen I think your right. Not to be rude but by the time you get the 2.8 ready for boost you would of been better off buying an s4. If you could advance the 2.8 platform though then more power to you.

[AudiA4_20T]

As much as I'd like to see it happen I think your right. Not to be rude but by the time you get the 2.8 ready for boost you would of been better off buying an s4. If you could advance the 2.8 platform though then more power to you.

plus he's trying to do this *and* dreaming of a single turbo setup, which in itself is a project

[michael66899]

Buy an S4, you'll thank me later.

[spd579]

Buy a 2.7T drivetrain and upgraded rods and you're ready to go. Done

[somebody5788]

The 2.8 has the same rods as the 2.7, the pistons are the weak part.

ALL of the information you need is in

http://www.audizine.com/forum/showth...turbo-soon-etc

But ya you'll spend twice the money doing this then you would just buying my S4. http://fortwayne.craigslist.org/ctd/4108170613.html

[8bitwarfare]

I dont think it will be that bad. Sure it will be hard to do but thats what makes it fun. As far as money goes I dont think it will be too bad. When i get a doner car i can sell anything i dont use and in all acuality id just need pistons and main bearing caps. Plus i have a little bigger displacement and better heads. Even if I did swap a 2.7 Id still want to single turbo it just cause I like the idea and challenge. Money isnt too big of a deal. I can always get more. For the price of challenging myself and I really like the idea of keeping my engine with my car. Its all about taking dirt and turning it into diamonds. Isnt that what we all are doing here? If that wernt the case everyone would just buy crazy fast cars from stock.

[RedRocketS4]

i would have to agree with most of the others. a 2.7t block is pretty cheap and easy to come buy now-a-days. Actually, your best bet would be to pick up a short block and rebuild with rods. 2.7 pistons are good for your goals. Then (given they are good), rebuild/build/whatever your 2.8 heads and use them. or just use the 2.7 long block and single turbo it with something small. it will easily get you 450whp.

there is a short block, long block, etc. for sale a few hrs from you... not mine. http://www.audizine.com/classifieds/...n-turbo&cat=23

Good luck and I hope you have a spare car to daily

[hots4auce]

Clint your the man. Your the Audi racing
god guru you win. Your a winner ding ding ding!
There are you happy. Put your money where your
mouth is what are you running. Oh wait an 88glx.
If you can not be a prick in one post ill come down to
ftl and pay you.

[97B518TQM]

How about you start by bolting a set of stock S4 K03s with a stage 1 tune on your A4 and see how long your 2.8 engine will last. Then if your engine is still in one piece then think about 400-500 reliable hp.

[somebody5788]

How about you start by bolting a set of stock S4 K03s with a stage 1 tune on your A4 and see how long your 2.8 engine will last. Then if your engine is still in one piece then think about 400-500 reliable hp.

Been done,

no it didn't last.

Let's just put it this way, if I wanted to put a single turbo kit on my S4 I'd have to spend about $6k all said and done and that is on a completely stock engine without adding rods, pistons, or anything special but getting around 450 awhp. To do the same on a 2.8l + the 01E trans swap + a built motor you're looking at an easy $12,000-$15,000

[Raacerx]

With proper tuning, a stock 2.8L will last just fine. Plenty of vehicles run boost without forged pistons. The 2.8L and 2.7T share the same rods, same valvetrain, etc. The primary differences are the compression ratio and the 2 bolt versus 4 bolt mains. Except that they use 4-bolt main caps, they just don't use all 4 bolts. Some of the blocks are even drilled and tapped for the other bolts, most have at least a pilot hole. Compression ratio is easy to deal with.

Especially with water/meth and a good intercooler and good gas (E85 would make it way easier), you'll have no trouble running Stage 3 power.

The big difference is that the 2.7T, due to being a turbo motor from the factory, has more safeties in place when dealing with detonation or high EGT so the tuning matters even more on the 2.8L. You'll definitely want to swap in the S4 ECU and harness because the 30v V6 uses ME5 and not ME7, which makes tuning way more of a PITA.

I was going to turbo my 2.8L, and the only reason I didn't is because I also had a single turbo S4 and I had no need for 2 different boosted V6 B5's. It will take a significant amount of work in some respects, but you won't even need to pull the engine out.

[aysix]

With proper tuning, a stock 2.8L will last just fine. Plenty of vehicles run boost without forged pistons. The 2.8L and 2.7T share the same rods, same valvetrain, etc. The primary differences are the compression ratio and the 2 bolt versus 4 bolt mains. Except that they use 4-bolt main caps, they just don't use all 4 bolts. Some of the blocks are even drilled and tapped for the other bolts, most have at least a pilot hole. Compression ratio is easy to deal with.

Especially with water/meth and a good intercooler and good gas (E85 would make it way easier), you'll have no trouble running Stage 3 power.

How many 2.8 NA V6 single turbo builds have you guys at 034 done?

[ddillenger]

With proper tuning, a stock 2.8L will last just fine. Plenty of vehicles run boost without forged pistons. The 2.8L and 2.7T share the same rods, same valvetrain, etc. The primary differences are the compression ratio and the 2 bolt versus 4 bolt mains. Except that they use 4-bolt main caps, they just don't use all 4 bolts. Some of the blocks are even drilled and tapped for the other bolts, most have at least a pilot hole. Compression ratio is easy to deal with.

Especially with water/meth and a good intercooler and good gas (E85 would make it way easier), you'll have no trouble running Stage 3 power.

The big difference is that the 2.7T, due to being a turbo motor from the factory, has more safeties in place when dealing with detonation or high EGT so the tuning matters even more on the 2.8L. You'll definitely want to swap in the S4 ECU and harness because the 30v V6 uses ME5 and not ME7, which makes tuning way more of a PITA.

I was going to turbo my 2.8L, and the only reason I didn't is because I also had a single turbo S4 and I had no need for 2 different boosted V6 B5's. It will take a significant amount of work in some respects, but you won't even need to pull the engine out.

Compression ratio is a big deal. Shit metal pistons, also a big deal. Biggest deal that you chose to overlook is this: He wants 500hp. He does not want it to just survive, which I agree CAN be done with shit pistons and high compression. Big power on the other hand, cannot.

Also, his car is DBW, thus it IS ME7, not M5.92 (see what I did there? E=ELECTRONIC throttle, which M5.92 most assuredly does not have)

[8bitwarfare]

that was one thing i was wondering too mine is drive by wire. all the trouble iv been hearing is from the drive by cable ones. i mean i will be buying a salvaged s4 for parts so the ecu wont be a big deal but i was just curious. how do you tell if its M5.92 or ME7? and i see what your saying my ultimate goal here is 400-500 but i dont expect that right away. i saw on the other 2.8 build thread about compression dropping head gaskets. would you think it would be more reasonable to start with the single turbo kit and the headgaskets. and run a nice sized intercooler with water/meth. to start with and sort of work my way up? i was just worried if i did melt my pistons would that damage the block and anything else? i just don't wanna be messing with fire and toast my engine. i deffinatley see what your saying though running it stock with low boost for a while would at least give me a buffer to save up for a major overhaul. another thing is i need reliability this is my dd. i want to be able to trust it on long trips.

[somebody5788]

that was one thing i was wondering too mine is drive by wire. all the trouble iv been hearing is from the drive by cable ones. i mean i will be buying a salvaged s4 for parts so the ecu wont be a big deal but i was just curious. how do you tell if its M5.92 or ME7? and i see what your saying my ultimate goal here is 400-500 but i dont expect that right away. i saw on the other 2.8 build thread about compression dropping head gaskets. would you think it would be more reasonable to start with the single turbo kit and the headgaskets. and run a nice sized intercooler with water/meth. to start with and sort of work my way up? i was just worried if i did melt my pistons would that damage the block and anything else? i just don't wanna be messing with fire and toast my engine. i deffinatley see what your saying though running it stock with low boost for a while would at least give me a buffer to save up for a major overhaul. another thing is i need reliability this is my dd. i want to be able to trust it on long trips.

I'm just saying I put $4000 into my old A4 trying to get a nice running boosted one and I ended up taking a $6000 hit on what I paid for the car and what I put into it. Do yourself a favor and just don't.

[8bitwarfare]

haha i already have over that in it just from fixing broken things, getting the oil leak stopped, and a nice intake and exaust. well sorta nice. you wanna talk about stupidity i spent 1300 for crapy supersprint headers and thev leaked ever since i got them. that was a waist of money. but putting money twards something that actually makes sense and more importantly i love doing it. you say work i say fun. and money isnt a concern at least id have something to show for it. what kind of a4? was yours the v6 too?

[ddillenger]

Compression lowering headgaskets=90 bucks PER SIDE.

You can buy a 2.7t longblock for 3-400 bucks, and it has forged pistons and will hold 400hp all day long.

[Gaki]

any reason why you don't just stuff a vr6 in there? Seems like a better choice plus I've heard of a few s4s with vr6s ;)

[Raacerx]

The majority of 2.8L 30v out there are DBC, so I assumed it was.

E85.

And perhaps you can find $300 perfectly good 2.7T longblocks where you are, but I certainly cannot in California.

The OP also said he wants 400-500 horsepower; 400bhp is 300whp. That's nothing.

[8bitwarfare]

no reason realy. i just like the idea of using the motor i have. like i said i need an s4 parts car anyway so ill have a motor i just dont want to use it. call me stupid. i just wanna see what this underrated 2.8 can do to be honest. i have seen some of those vr6 swaps and ill agree they are pretty sweet though.

[8bitwarfare]

does that mean mine would still be a pain to tune? like you said most are DBC iv never really heard anybody tuning the drive by wire ones. whatever works better i can do. this is one of the main areas i wasn't certain on which direction to head.