All Titans run rich at WOT

Thrust_Titan · 02-28-2006, 09:50 AM

My .02 cents if it helps

All Titans run rich at WOT when you go into open loop. The ecu pre-sets are rich about 11:1 if you get a Adjustable Fuel Pressure Regulator, Adjustable from 30 to 75 psi. You will be able to adjust the fuel pressure down so at WOT you get 12.5:1. Your LTFT and STFT A/F in close loop will adjust to keep it at 14.7:1 for cruising. Mods will not change the way the LTFT and STFT A/F mix works in the ecu. The regulator return can T into the rubber hose from the gas fill to the tank. Start fuel pressure at 51 psi and with a Wide-band Air/Fuel Ratio Meter, drop the fuel pressure until you are up to 12.5:1 in WOT best to do this on a DYNO

Now all of us can adjust for any mods and better gas mileage and the price is right.

This will hold us over until a PROGRAMER comes available.

Titano24's · 02-28-2006, 10:48 AM

Quote:

Originally Posted by Thrust_Titan

My .02 cents if it helps

All Titans run rich at WOT when you go into open loop. The ecu pre-sets are rich about 11:1 if you get a Adjustable Fuel Pressure Regulator, Adjustable from 30 to 75 psi. You will be able to adjust the fuel pressure down so at WOT you get 12.5:1. Your LTFT and STFT A/F in close loop will adjust to keep it at 14.7:1 for cruising. Mods will not change the way the LTFT and STFT A/F mix works in the ecu. The regulator return can T into the rubber hose from the gas fill to the tank. Start fuel pressure at 51 psi and with a Wide-band Air/Fuel Ratio Meter, drop the fuel pressure until you are up to 12.5:1 in WOT best to do this on a DYNO

Now all of us can adjust for any mods and better gas mileage and the price is right.

This will hold us over until a PROGRAMER comes available.

i'm guessing you did this? did you see a big difference on the dyno?

Wiscdave · 02-28-2006, 11:22 AM

Dude, let me know how you mpg and dyno results are!! I'll be up for doing this mod if it helps.

Thrust_Titan · 02-28-2006, 11:58 AM

I did this months ago among other mods (CAI) and I didn’t think anything of it I just assumed no big deal my CAI were working fine and the air / fuel was right where I wanted it to be, oops my bad as my kids would say. Sorry, no I did not do a dyno on just the regulator it is part of a bigger picture in which I am going back to work on.

GETSOMZ28 · 02-28-2006, 06:57 PM

That is strange, my Titan (when bone stock) showed 12.5 at peak tq and 13.0 at peak hp on the dyno. Granted the wideband was the tail-sniffer kind, but it wouldnt be off more than .5. I dont know what the A/F ratio is now that I have mods.

Thrust_Titan · 03-02-2006, 04:27 PM

Thats great to hear GETSOMZ28 from what I have seen your one of the first, maybe its your ECU software ver. or all that I have seen is with mods. Maybe its time to get the tail-sniffer out to recheck, if it's off and rich consistently, then maybe this may help you. It's working for me and all I'm trying to do is share some info.