sjc246

I'm trying to rule out my tune as the source of a problem so I would like to reflash my stock file and test drive it that way (should only take 1-2 miles in gears 1-3 with gentle throttle). I don't plan on getting into boost at all, so I should be fine with the rest of the mods, but I'm worried about the injectors. I know I can't run 550cc injectors without a tune for any significant amount of time, but is there enough range in the fuel trim that it will compensate or will it go into limp mode and wash down the cylinders?

Thanks in advance!

tw2

You will be quite rich in open loop but shouldn't be an issue for a quick drive.

SICAMG

You can, I have done it. But remember every car is different ! With that being said ,the O-2 sensors will keep the AFR in check during normal driving but.... In boost ...nooooooo !

SMed08

I've babied it around on 550cc without tune, it's rich, but fine.

SICAMG

SMed08 is probably more accurate than me because I forgot that I also have an adjustable regulator that runs at around 60psi....much lower that factory stock fuel pressures so that will make a difference as well.

SMed08

Stock fuel pressure is 75-80psi ish

SICAMG

Yea my pressure was higher....90+ due to the fact that the in tank filter was removed and a 3/8 feed line was installed. A lot of restriction when those two things are "freed" up.