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Ive recently had my car mapped and am also disappointed with the lag using a GT3071R which should spool quicker than your GTX I believe. At 4K RPM Im seeing 15psi. Im putting it down to the hot side of the turbo as I had it opened out from .6 to circa .7 to give more top end. This is using an N75.
I would lose the 7A cam(s), swap out the turbo for GT3071R (0.63) for a target of 450bhp territory and desire for strong mid range torque (as opposed to max power up top).
3071R with standard cams is surge-o-rama, you are going to have the same spool as a 0.82 trying to limit the surge.
Also, 450hp is not really possible on a 0.63 71R.
What difference does the gear you are in make typically. I was taking the numbers off my dyno print out and i noticed it was mapped in 4th. I would expect the calculations in the software used by the mapper to take the gear out of the equation but Im no expert in the subject.
What difference does the gear you are in make typically. I was taking the numbers off my dyno print out and i noticed it was mapped in 4th. I would expect the calculations in the software used by the mapper to take the gear out of the equation but Im no expert in the subject.
On the dyno the gear does not make any difference at all.
I have a theory that my lag could be to do with my twin pass intercooler being too restrictive and giving too big a pressure drop although I would imagine this to have more effect at high revs than in spool up. I've decided I'm getting a bigger one anyway with improved flow as my inlet temps are too high, I'll post the results when available.
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