I'm putting on a AFPR next week and was wondering what everybody has there PSI set at? I have a 350 tpi also, I'm doing a cai and headers in the very close future also. and did you notice a big difference by adding a AFPR?

 

Best thing to do is monitor the pressure setting with the stock FPR for refernce,set the AFPR the same, then monitor O2 voltage during some runs, increase/decrease as needed.

 

Your year of TPI uses a stock setting of 43 PSI. Many have found that their cars run a bit quicker with that pushed up to about 45-47 PSI. Stock TPI tuning at WOT is apparently just a smidge on the lean side for best power. Install an aftermarket chip, however, and all that goes out the window.

Best bet is trying different PSI settings at the track ON THE SAME DAY and see what pressure gets you your best time.

No, you won't feel anything in the seat of your pants, usually, unless your backside is precision caibrated like mine.

 

There's some info (dyno-sheets) on this website that actually shows dyno-proven power increases by increasing the fuel pressure. I'll have to find it again but the power increases were something to the tune of like 15-20 horses with the PSI bumped up to around 46-50 psi...