bigdom

I have a 12v v6 which i plan on porting the heads intake and exhaust manifolds as well as dropping in a set of eurospec 272* cams. now when this is all said and done will i be running too lean is there anything i do to increase fuel output without going standalone ? or will i still be on the safe side ?

JWG

installing an O2 sensor meter constitutes the only way you will know how lean or rich your car runs.

As for controlling fuel trim, you may simply do that by installing an adjustible fuel pressure regulator. If your O2 meter shows you need more fuel than just an adjustible FPR will allow, go to slightly larger injectors in addition to the adjustible FPR.

However, please note that you will likely get little benefit from 272 cams, because you may not easily increase the ECU's 6200 RPM fuel injector cut-off. So, installing 272's will likely yield you a loss of low-RPM power but not afford you the opportunity to enjoy the full benefit of the 272's high-RPM power.

With AAH cams, I feel no power loss all the way to redline; yet, there exists a noticeable shift of power to higher RPM's compared to AFC cams. I suggest that you invest a hundred bucks for used AAH cams and try them out before spending any money for 272's. Qfrog has invested money in 272's and a stand alone ECU to allow him higher-RPMs to take advantage of those high-rpm cams, but he has not gotten his 12v running properly in over a year.

I find it better to have a lower but broader (more usable) power curve than a higher but narrower (less usable) power curve. Do some insider reading of F1 and see how the "most powerful" engines in F1 have not won many races over the years. Reason: Peak power has little real world application or relevance. The most important question for race engine engineers remains "what does the overall power curve look like?", because there exist very few tracks where narrow power curves allow one to win the race.

You should search the archives. We have discussed these matters in great detail over the last several years.

bigdom

thanks will do. I have an aah in the car now but its got way over 230k on it and its showing signs of wear im hoping to replace the motor before the winter hits so i figured do the work while the motor is out but now that i read this i will give the aah's a try first. any more info would be greatly appreciated.

Slye A4

Blah, I run lean with a ported maf, tb, S3 kit, and ram-air (moded air box)

bigdom

where do you get a ported maf & the s3 kit ?

4AudiQ

1. Mance sells a ported MAF. Look for his name "1PissedOff90" and email him asking how to get his MAF, but be sure and include the word Audi in the subject line. He gets 200+ email's a day.
2. He no longer sells the S3 Hose Kits. You would have to buy that from a fellow AW member who wants to sell their kit.