Been chasing this for a month guys!!
10:1 comp, long tubes, ported eaton on 17#, sumped tank magnafuel 750 on e85. 80# injectors. Fuel pressure idle 40 psi-65psi WOT. 5 speed manual tranny.
Nitrous system is NX with dynotune tomahawk nozzle mounted in intake tube about 2" before TB.
Basically when spraying (125 shot), everything is fine UP TO about 5k rpms and then it starts to hesitate a little. Not really a misfire, just kind of a light surge. Then around 5500rpm everything clears up and runs perfect until the next shift then it does exact same thing at the exact same rpm.
I thought I was dealing with an ignition issue so I replaced coils with brand new gt500 coils and installed a boost-a-spark. I've tried #8 and #7 heat range plugs and have tried gap from .022 to .028 with no difference at all.
I do have wideband and fuel pressure gauges. Wideband on initial 3rd gear 3k rpm pull will read 10.5 then by 6500rpm will end around 11.5. Fuel pressure stays constant 60-65 psi thru entire pull.
Any ideas??!!
10:1 comp, long tubes, ported eaton on 17#, sumped tank magnafuel 750 on e85. 80# injectors. Fuel pressure idle 40 psi-65psi WOT. 5 speed manual tranny.
Nitrous system is NX with dynotune tomahawk nozzle mounted in intake tube about 2" before TB.
Basically when spraying (125 shot), everything is fine UP TO about 5k rpms and then it starts to hesitate a little. Not really a misfire, just kind of a light surge. Then around 5500rpm everything clears up and runs perfect until the next shift then it does exact same thing at the exact same rpm.
I thought I was dealing with an ignition issue so I replaced coils with brand new gt500 coils and installed a boost-a-spark. I've tried #8 and #7 heat range plugs and have tried gap from .022 to .028 with no difference at all.
I do have wideband and fuel pressure gauges. Wideband on initial 3rd gear 3k rpm pull will read 10.5 then by 6500rpm will end around 11.5. Fuel pressure stays constant 60-65 psi thru entire pull.
Any ideas??!!
