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#43: 03-22-2010, 12:07 PM
LittleBlueGT's Avatar
Title: RS4 killer
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Location: Winnipeg
Car: 05 Atlantic Blue non-limited GT MT
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Clark on NASIOC had a good post, can't find it right now, on the stock pistons.

But basically our pistons are bigger then most, and that inherently leads to certain problems.

FWIW engine builders have learned a thing or two in the past few years building suby motors. I believe the Cosworth pistons are becoming the piston of choice ($1000 or so) as they are forged have a very good rep, and have no audible piston slap at temps around -15F. A local had a SB with their pistons in it, and after me bugging him he did some cold starts in the winter w/o plugging it in.

I agree that the tune is responsible for the vast majority of failures, but at some power level if one blows an engine, these might be the best option, and they seem to work just as well as OEM for a DD that puts many miles on.