Originally Posted by
DA BIG ONE
Art, The GM-8 exhaust turbine "exhaust outlet" is some of the limiting factor needing some porting. How much porting? It's more a matter of how much risk one is willing to take making walls too thin.
Some say the elbow after the gate is an issue, then some smoothing out of its inside surfaces are in order.
I really thing wee need those bigger Holset 35, 40 turbo's providing we stay out of the surge line, and keep boost at a level of 15+- psi @ intake.
If the GM-8 seems to run out of steam at 2800, were does a GM-8 run out with a free flowing exhaust? Mine definitely seems to lose it by 3100, maybe 3000.
Art.
Art Paltz
1999 Suburban K2500 6.5TD (stock)
2000 Undercover Dragster, 468 BBC, 7.74@173MPH, waiting on new 622 aluminum BBC to be finished.
1992 Tube Chassis Camaro, 468 BBC, 8.54@157MPH (SOLD)
1987 Buick Grand National, 11.8@114, pump gas (for sale)
1969 Camaro SS/RS 396-350HP, stock restoration, it never leaves the garage...