yeah they promise 15, but its a long shot, for the cost 15hp still wouldnt be worth it.

 

All smashed up along the passenger side, right?. think the car is worth it for the parts or would you plan onstraightening out the body/frame and fixing that one - then maybe sell it? or keep it and sell your 12V? you doing an aftermarket exhaust or just doing some stock replacement work?

 

Yeah 15hp is not a lot, I was talking with a guy about sending in the computer to have it done. It would of costed about $400 and only would of gave me 14hp, and it changeds the rev limit.

 

you go ahead and buy performance heads for your 2.8 (if you can even find them), and let me know how much more power you make from the heads alone.

mustangs are not audis.

 

yeah the ones thats all smashed on the sides, im guna get some estimates for straightening it out, and if its not worth it im guna part it, and take that engine. otherwise i want to strip it and rally it, if i can get it running cheaply. for my car im planning just cutting and welding in a custom setup, dont have the $ for a full setup.

 

Don't take this as an insult, but of course you can do that and make a lot of power on a Mustang engine...or any other crudely built, low-tech, low-precision engine. On a high-tech, precision engine like the Audi motors, you're not going to see that kind of a gain. For one thing, most of the flow capability of an engine like this is already taken into account and the ECU is tuned to take advantage of it (which is why an NA ECU will gain only a few hp). Another reason is purely volume - on a big-capacity engine, incremental increases in flow capability (such as gasket-matching or mild porting) have a much more significant effect than doing those mods to a smaller motor. That's where the turbocharging "replacement for displacement" theory comes in - think of it as artificial displacement. On a smaller engine like the ones offered in the Audis, the traditional hot-rodder techniques of porting, etc, don't pay the same dividends, both for the fact that they're small displacement to begin with, and for the fact that they're manufactured to much tighter tolerances and tuned more precisely right from the factory.

I don't discount the fact that on a domestic V8, you can pull massive gains from relatively small changes (a new cam in a domestic OHV V8 can pull 100hp or more - you might get 5hp on the Audi NA motors). On these engines, those types of gains simply don't happen. That was the point I was making in my original post.

 

Ok, but I was not trying to offend anyone, and my Mustang was not ment to be a part of the poast, I was simply stating that yes their are bolton mods that do give high increase in power, and if you cant even find high performance heads for an Audi then how could you figure that it would give it any power increase at all?

 

I didn't think you were trying to offend And yes, there are bolt-ons that will increase power. My point is that there is not much to be gained on a naturally aspirated, small displacement, tightly tuned engine like the Audi uses. As for whether there would be any power increase, I say there would be because even in engines like this, by increasing port diameters, manifold cross-section (as with extrude-honing or similar processes), going to larger lift/higher duration cams, all will increase volumetric efficiency in an engine, which leads to a gain in output. If you can get more air into the engine, and combust it with a proper proportion of fuel, you can make more power, just as with the bigger domestic engines. However, there's a limit to it, and on engines of this size (displacement), and that are tuned as finely as these are, most of that power has been extracted already, at the factory. Compare it to the typical 5.0 Ford or LT1 engine, which is much bigger and much more crudely built. The tolerances on those engines, I'd be willing to bet, are far more lenient than on the Audi motors, so getting breathing mods for them will produce far more power than they would in our engines, or for that matter, far more than if Ford and Chevy had been precise when building the engines (of course if this was the case, they'd also make far more than the power they're currently rated for). I understand that they really couldn't be too critical, given the huge number of those engines they built (far more than Audi built), but that just means that building those engines up will be "easer" in that the breathing mods alone will make tremendous gains in power, to say nothing of forced induction.

Just because there are no aftermarket high-performance heads available off the shelf for the Audi engines doesn't in any way mean they wouldn't help the engine make more power. It means simply that the cost of building such heads when compared to the power gains they provide is way too high to find a profitable market, especially since these cars were not built by Audi to be "performance cars". Yes, they were built to be reasonably quick and capable, but they weren't intended to be "power" cars. They're near-luxury sport sedans, with a mix of comfort and decent on-road capability. When the B5 came out, or hell, even when the facelift came about in 99.5, I doubt there was much in the way of an aftermarket for these cars. Only in the past few years have these cars likely started to become popular for tuners. And in any event, if someone out there decided there was enough of a market to develop high performance heads for the car, it's most likely they'd have concentrated (rightly) on the S4, as it's a) the highest-power of the cars in this range from Audi, and b) it's a twin-turbo and therefore the most likely car of the range to be owned by anyone with performance aspirations. The 1.8T builder might have found a niche for heads at some point (and may still, now that its popularity and potential are really being realized and there are guys that are hitting the limits of what is possible on an OEM head, or even one with cams), but even that's hard to say. Us 2.8 guys though would have to commission custom jobs every time. Even though the 2.8 was conceived to be the "fast" A4 of the range, once turbo tuning caught on, it quickly flipped the other way. No one's gonna invest what it would take to develop 2.8 heads, and that's a good lesson for most of us to follow - the cost just isn't worth the end result.

 

Why don't you go educate yourself on motodyne and stop posting worthless 12v info. Motodyne us a rip off - literally. They will take your money and turn tail. How do you plan on controlling timing with your setup? Fuel delivery? Boost? If you're not going standalone you're SOL...


Sell the 12v and buy something moddable. I know STS style turbos have been done before but the same issues on controlling ECU maps exist. The hitachi ECU is worthless for modding.

 

Oh, ok, im sorry, I was not sure there for a munit if you were mad at me or not.......again im sorry, but I guess your right, that a 5.0 motor on a mustang will get a lot more hp out of it than a smaller 2.8, so yeah I see how you figure that it would not get any where near close to how much I got out of my Mustang, so I guess that putting an exhaust and manifolds on it would be more worth the money right?