I have fitted the Supra 98 TWINTURBO fuel pump this weekend,and now i think the car is running Rich !i changed my original fuel pump cuz it wasnt able to keep up when i boost up to 15 psi on the stock turbo .
so what should i do ,to take back the car to the stock fuel rating and to fix this rich problem, atleast for now,,cuz i drive the car daily ! :help
After Fuel pump upgrade ,,help>>>
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- Car: '92 240sx Convertible
'94 F-150 - Location: Fredericksburg, VA
i don't think the FPR will help too much. check all your injectors with a stethascope or take a screwdriver and put the tip to an injector and the handle to your ear and listen. you're trying to find an injector that is busted. the injectors will run full open when they freeze (at least in most cases, this seemes to happen). a frozen injector makes a sound like it's having a heart attack or no sound at all. a normal injector will sound like a steady thump thump that's not too loud.
i'm just offering one possibility, but I have heard of FPR's going out when the pump has been upgraded. If that's the case, I would replace it with a nismo FPR just because of cost issues (the nismo part is relatively cheap and easier to obtain than a stock unit)
i'm just offering one possibility, but I have heard of FPR's going out when the pump has been upgraded. If that's the case, I would replace it with a nismo FPR just because of cost issues (the nismo part is relatively cheap and easier to obtain than a stock unit)
the mkiv pump is a little bit of overkill on the stock turbo.... it flows 290lph, and i know guys with the walbro on stock turbos that are having the same problem as you.... i've got gt25r intake man fmic header 3.75 inch exhaust... and mine still runs rich from the supra pump.... i got the aeromotive fpr and afc to fix it, but really you just need more boost 
here's some good news too if you ever go crazy like i have been recently..... i've got my friend at the engineering dept working on a voltage regulator that i can run on a switch to the mkiv pump... at 13.5 volts it flow 380lph.... this does shorten the life of the pump, but that's what the switch is for.... did he say 380?
loudbay wrote:the mkiv pump is a little bit of overkill on the stock turbo.... it flows 290lph, and i know guys with the walbro on stock turbos that are having the same problem as you.... i've got gt25r intake man fmic header 3.75 inch exhaust... and mine still runs rich from the supra pump.... i got the aeromotive fpr and afc to fix it, but really you just need more boost
Did u say moooore boooooooost !i can live with that ! :ylsuper
But if i increase the boost till 15 psi,,wont the pump push even more and become richer ???