Q: EGT Dangerzone & Best Fuel Pressure?

[The Ghost Man]

Hey Any & Everyone,
Werkkrew and I just finished stage two of the fuel mod project on my 89T. Just installed the Walbro fuel pump, AFPR w/ gauge and a J tube bypass. All went well and now she flies like super-trip muthaf*cker! Took her for 2 rides she was monster-sick with as smooth an idle as I've ever heard, quiet, strong and responsive. She's running a strong 15 psi boost, the fuel pressure's reading 31 off and 41 on and my EGT is a little over 1400.

My ride's got the Lexus AFM (no advanced screw yet), NGK copper plugs, 550 injectors, stock Buschur OEM 1G BOV, stock intercooler, 60-1 CT-26 Turbo, 3" turbo back, Apexi power filter, upper hardpipes.

We're gonna finish tuning her and now need to know:

1) what the BHG dangerzone for the EGT range, is 1400 too much? And...

2) what's the best fuel pressure to be running?

Thanks to all in advance!

[bgrieger]

1) EGT is irrelevant. Detonation is. Test and tune on a wideband, not an EGT gauge.

2) ideally, you want the idle to determine the base fuel pressure. Again, a wideband will help set this value based on the car, but the ECU can compensate. 40-43 PSI is roughly a safe zone for base pressure (close to factory anyhow). Fuel pressure is a rough tuning tool however. A fuel computer is the better way to go.

Bob