MAFT HELP (I'm either stupid or missing an obvious point)

[vassil]

Hi Guys,

I need some help. The car is a 1992 GSX and the relevant mods are MAF Translator, 9" K&N cone filter, TMO Stage III ECU & a Thermal Catback. While logging the car the fuel trims are at 81% for lo, mid & hi. The O2 voltages oscillate at idle, cruise and at WOT I am running a .92 -.94
I have the Base on the MAFT set at -10%, the idle set at -15% and mid & wot at -10%. Finally I got my idle trim to be at 110% but the mid & wot are still at 81% even if I got -15% on both.

I am either stupid or missing an ovious fact ...
With the relevant mods mentioned on the top the car should take more air, making the mix leaner, why is the car running so rich w/o injectors, FPR or upgraded fuel pump? Is it a goofy calibration no the MAF translation or ...

BTW ... I have 0 knock.

I do have the original version 1.0 of the ROM and will be getting the latest v.1.3 next week. Any help will be greatly appreciated.

Thank you very much!

 

[Tallen]

on a 1g, you need a lower o2 reading. lean her out. the MAF on default settigns does tend to run rich....very rich. maybe its a v1.0 thing. cant wait for my chip either. flip the injector switch over one to lean her out a lil, then tune from there.
"90-94 Turbo

The O2 voltage will vary a lot more from car to car. Your numbers can vary from these easily by as much as .05v. 1G cars have more grounding issues and 90s in particular will read leaner (lower voltage) With a 1G car the compression is lower too so you can run leaner before getting knock that retards timing.

On 91 octane gas you will want .89 to .91v If you are at a higher altitude then lower voltage is OK.
On 92 octane gas you will want .88v
On 93-94 octane gas you can get away with .86v

The same applies to the O2 Voltage when the O2 sensor heats up, it will drop some."
-RRE