99 FRC Tuners PLEASE Step in!!!
#1
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Ok so heres the deal...
My 99 is supercharged with 9psi of boost. I had it tuned with 42# injectors and the injectors were maxed out at 116% Duty Cycle. So I bought some 57# Injectors and have had a lot of trouble since then.
I finally got a decent tune on it with the new injectors and decided to go with some Long Tube headers from DRM. Again all hell has broke loose.
I have tried everything from open loop SD, to going back to a stock tune with the IFR change. The car runs 17-18:1 lean for some strange reason. If you give it a bit of throttle real quick it will go to 15:1 but if you hold it, it goes lean off the charts again. It has a hard time idling and pops a lot. Does anyone have a clue as to what may be the problem? Thanks!
My 99 is supercharged with 9psi of boost. I had it tuned with 42# injectors and the injectors were maxed out at 116% Duty Cycle. So I bought some 57# Injectors and have had a lot of trouble since then.
![Bang Head](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_banghead.gif)
![Barf](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_barf.gif)
#2
TECH Enthusiast
iTrader: (14)
Join Date: Apr 2005
Location: NE Ohio
Posts: 591
Likes: 0
Received 0 Likes
on
0 Posts
![](https://ls1tech.com/forums/images/ranks/ls1tech10year.png)
![Default](https://ls1tech.com/forums/images/icons/icon1.gif)
Offhand, I'd say it's the tune.
Seriously, there's allot of stuff it could be...from incorrect IFR table settings, VE issues, to plain old air leaks.
Provide a few more details, such as Fuel trim values at idle, O2 readings, MAP value, etc. and we may be able to help a bit more.
![Devil](https://ls1tech.com/forums/images/smilies/LS1Tech/gr_devil.gif)
Seriously, there's allot of stuff it could be...from incorrect IFR table settings, VE issues, to plain old air leaks.
Provide a few more details, such as Fuel trim values at idle, O2 readings, MAP value, etc. and we may be able to help a bit more.