Well, doing research over on trailvoy.com, a stock TB 4200 will take 6-8 psi of boost stock. The only problem is the computer and tuning it. Im not that advanced, but from what I gather the engine uses a MAP setup, so that when boosted it cant allow for the extra pressure and cant supply enough fuel to meet the oncoming air.
Is there anyway to convert the engine to run on MAF instead? Wouldn't this be more boost friendly?
Heres a link with some good info, but the whole tuning issue is still very vague for me...
http://forums.trailvoy.com/showthread.php?t=5386
