Tuning issue

[cjpp78]

O.k I have had my fp set at 33psi, vacume connected. AFR's at idle 14.7-15.3 and at wot, low 11s. Today I checked my vf's, at idle it was 3.53vf with 14.7-15.3afr.

I have attempted to adjust this by adding fuel with FPR. No change in vf's when I go up to 35psi on FPR. The vf's do go down to 2.25v when I pull vacume hose off FPR and FP is around 43psi. 43psi seems to high for base pressure with vacume connected though.

Any ideas as to why I cant get my vf readings lower at 30-33psi of fuel pressure with vacume connected?

MODS
built motor,forged internals
walbro 255 fuel pump
lex/550 upgrade
SAFC
SP57 TURBO
npr intercooler

 

[Supracentral]

Baseline factory fuel pressure is 38 - 40 psi with the hose disconnected for the 7M-GTE

43 is not that far off from "normal".

Always adjust with the hose off btw, it ensures consistency.

If the car seems to like 43 psi, run 43 psi. Supra's are odd beasts.

 

[cjpp78]

Thanks mike, yea it does seem to work best at 43, so 43 it is.