ndmracing

Anyone with a JRSC have hesitation problems between 3000 and 4000 rpm? My car hesitates and shows a lean condition for a second. This is with partial throttle. My atmospheric fuel pressure is at 65 psi and 52psi static. I have a Cartech 2005 and am running 10 psi.

redline

sounds like you are running a little lean are you using the stock injectors?? A lot of JRSC have the det. problem in that part of the Rpm.

Do you have anything else to tune fuel or timing??

bgod

which fuel pump are you using and do you have a fuel controller?

ndmracing

All I have to monitor and control fuel are the A/F meter, Cartech FMU, and fuel pressure guage. I have the Walbro fuel pump that Jackson racing sells. Not sure exactly what it flows at. I'm guessing 225 lph. I've been messing with the Cartech for days now and nothing seems to help out. I pumped the atmos. press. to 70 psi and it seemed to help slightly...but it could be my imagination.

redline

YOU MUST HAVE BIGGER INJECTORS AT 10psi

ndmracing

I understand I need bigger injectors, but the problem is under part throttle...maybe 3-4 psi