I had asked this some time ago. I was told by Steve Monroe [member on this and the other board] that he knew a guy with a GN that they figured was making a bit over 300 HP.. and that he had joined the DOTC club.. They weren't sure why as it wasn;t a ultra high HP car, and wasn't detonating.. had a scan tool etc.. Pulled the motor apart and it was an N/A crank. Also heard that Kenne Bell says the N/A crank is useless past 300 HP.
Derek Grubb in PA has a Buick GN powered 240Z and had an NA crank in his engine that lastest a few hundred 1/4 mile passes with no failure before he rebuilt the engine just to refreshen it. It went a best of [email protected] and a perfect state of tune. NA crank remember!
Most of the passes were in the 10's but he did keep boost around 19-20psi and his car is a featherweight at 2550lbs.
I think the NA crank with careful tuning is safe into the 11's. Just don't go nuts with the boost. Personnally I would still rather run a GN specific crank to not temp fate.
2725lb '87 RX-7 w/ '87 GN driveline. [email protected] on NittoDR +stk GN turbo
I won't mention any names, but I know there was a South Florida builder tring to pass them off on the unsuspecting.
If I'm not mistaken that blew up in his face,
no pun intended. Being the crafty well spoken gent he is, worked right around it.