Time Trial Build Thread (aero, widebody, any other nonsense)

[78F350]

It's all awesome! I think it may be about time to change your signature:

1997 2.5 Boxster NASA Time Trial track car
2003 911 C2
NASA HPDE Instructor

I was talking with one of the GRM guys in person (pretty sure that it was 'Stafford1500') about boost with the Audi 4.2s. He mentioned changing the head gasket to adjust the compression. I don't remember the details, but I think that he recommended a thicker gasket to slightly reduce the compression. If you are boosting a stock 4.2 now, you may want to look into that for when you build up the replacement engine.

There may be a few guys on the AudiWorld Forums that have the forged internals tucked away. "audinutt" offered me a set about three years ago, but at the time I didn't plan to tear down an engine. It may be worth asking. If they see your build they will probably be happy to help out.

[truegearhead]

Originally Posted by 78F350

It's all awesome! I think it may be about time to change your signature:



I was talking with one of the GRM guys in person (pretty sure that it was 'Stafford1500') about boost with the Audi 4.2s. He mentioned changing the head gasket to adjust the compression. I don't remember the details, but I think that he recommended a thicker gasket to slightly reduce the compression. If you are boosting a stock 4.2 now, you may want to look into that for when you build up the replacement engine.

There may be a few guys on the AudiWorld Forums that have the forged internals tucked away. "audinutt" offered me a set about three years ago, but at the time I didn't plan to tear down an engine. It may be worth asking. If they see your build they will probably be happy to help out.

This is one of the reasons I went to e85, e85 has almost 3 times the evaporative cooling and reduces the detonation for high compression motors so there's no need to reduce compression. I also had EFI Express put the whole plan together, they have a tremendous amount of knowledge turo'ing these motors so I basically just returned everything I bought and bought their recommended setup.

Thanks for letting me know about the forged internals tucked away! I'm reaching out to them right now and will report back.

[truegearhead]

I'm super concerned about heat on this car so I've gone a bit overboard on a few things including these intercoolers. I've instructed a lot of students that had turbo cars, and almost all of them (including the factory turbo'ed cars) haven't survived a track weekend so I'm trying to be very careful. The intercooler setup I've designed should be good for over 2,000hp, it uses a huge water to air intercooler that is cooled by two large radiators that are squeezed into the rear fenders. I still need to fab up some aluminum plates to seal the doors up but its taking shape.