Thread: Problem with FAST XFI.

Hey UR50SLO you have same setup i have, have you taken it to the track? Who tuned it ?

They sell a dual sync distributor you could install and run it sequential.

Quote: Originally Posted by Turbopoul Hey UR50SLO you have same setup i have, have you taken it to the track? Who tuned it ? I tune all my stuff.... And it's the wife's daily driver in the summer. I put it all back together in a week... and tuned it down at the Sy/Ty nats and drove it around a little... well.. when we got back I didn't see it except for at home.... So I didn't get to do much else with it other than that...

Quote: Originally Posted by Turbopoul Heres something strange, in openlop , its still 100% dutycycle ?? I'm thinking it has to be a problem with software ??? What are your VE numbers? If they are huge, it could still be at 100% at WOT. What are your pulsewidths at full boost?

Quote: Originally Posted by Turbopoul I noticed that the ground wire is only 16g, and original from 1992. Wonder if that could be the problem ? If your fuel pressure is not dropping at WOT, then the wiring is not the problem. Can you observe your fuel pressure while driving? Is it dropping at WOT? -Bob C.

Pm sent. I am very curious what this problem is going to end up being, should be interesting..... I was running 6000 rpm in 3rd gear 11.2 afr and I never saw my 75's go over 74% dc, with the VE table in the 76 range. This is with a single 340 pump.

Me too is your tps reading 4.92 at 100% does your tps volt reading match the xfi just a thought s your injector opening time in ms, 1.0 or 0.9 or 0.8 thats on the operation cubic inch table just trying to help this may not Cal and all the tuners on here are very helpfull good luck bud.

So what's the latest?

did you clean the braided line after you installed the ends ? as shipped they are not very clean and have enough crap in them to clog up the little screens in the fuel injectors.

This is the link for the Delphi 85# injectors: As someone else stated, you may want to make sure your injector filter screens are not full of junk. You can remove them and while holding them upside down gently tap them on a white cloth / paper towel to see if any debris comes out. You may be able to view them with some good light as well.