"""""""""""I think what your experencing is ccompressor surge since your letting more exaust out your spinning the turbo harder at any given rpm
meens your getting more exaust out the motor ...thats a good thing go to a 82 ar housing and bet it goes away.""""""""
Hey Red, i have the stock camshaft, at least i think i do. It spools up pretty good with a TA49 turbo and .63 garrett exhaust housing. It would only seem right that the longer exhaust duration of this cam would let out more exhaust gas, and flow more air. Now my question is if i put this cam in will it affect my spool up, especially with a .82 A/R housing. i would think that my turbo would spin harder and faster at a higher RPM, but what about low RPMs?? I want my boost onset to be a few hundred RPM lower, but im wondering if this will be the case with this cam. Usually on most engines, increasing the exhaust duration will give the engine a better top end, take away a bit from the bottom end, and increasing the duration period, intake and exhaust, brings your power band up a bit in the RPM range, less down low, more up high.
I guess im trying to ask is if the exhaust flow out the engine will be less at low RPMs, thus hurting my spool up and raising my boost onset RPM up a few hundred RPM.
In any case, i like the idea of this massive top end this thing gives you guys, 110 on 91 pump gas 127 with basically stock long block . . . .
Hmm, another thing i see is your short times all suffer, and your engine bogs on the low end due to too much fuel, think maybe the camshaft could play a part in that? i bet it needs a different fuel curve than the stock cam, even though the profiles are close. i just want this thing to come out of the hole as hard as it does now, and just scream up top,
Sorry for the long post,