Originally Posted by cossie400

a mate of mine had his cossie on the rollers today at engine advantages and made 550bhp@ 28 psi of boost trouble is he was aiming a bit higher but when the boost was uped all you'd get is alot of compresor stall. what would cause this? his spec is gt35, rs500 inlet, 8 greens, 7:2.1 comp, grp a ported head, bd16 inlet and bd14 exhaust cam. the only thing we can think of is the exhaust cam is to small because the air is getting in but can't consume it into the exhaust quick enough causing the turbo to stall? any input would be apprieciated thanks.