Went to have the car dyno tuned using HP Tuners. The car ran perfect while doing the N/A tune and put down 334whp 342wtq. The problem started when we started to spray the 130 shot. When the nitrous engaged the bank 1 would start around 14:1 a/f and start to richen up pretty quick, then in an instant it would shoot up to about to 18:1 and he would shut it down. When the car comes back down to idle it would misfire for a little bit and eventually smooth out. The entire time Bank 2 would stay around 14:1. We changed the plugs(gap to .030 so they wouldn't blow out), wires, and all the bank 1 coil packs, with no change in performance. Putting 50 shot jets in did not help either. Only code that is coming up is the cylinder misfire code. Any ideas to try.

04 6 speed 38k miles gto
ported throttle body
under drive pulley
130 shot plate NOS kit
kooks 1 7/8 long tubes off road mids
muffler delete on stock cat back
hard core intake
1-step colder spark plugs

 

So you had 2 separate widebands, one in each side, correct? Do you have the graphs? Was there any KR?

How are the fuel rails fed on your setup? Is it possible that you're running a single rail dry?

What plugs are you running?

May also want to have the injectors cleaned and flowed.

Another random suggestion....change your fuel filter.

Sorry, no set answer, just some ideas.

-Will

 

Did you look to see what the fuel pressure was doing?

 

fuel pressure only dropped 3 psi and its crazy that a 50 shot would do this the wet kit i just
used the schrader valve for fuel and two widebands true duals

 

Did you try upping the fuel jet a good amount to see if it changed anything?
Did you test the fuel solenoid and make sure it was flowing fuel?
What jetting are you using?

 

After the issues we had on my cousins car, I'm thinking it may be pulling too much off the rail....

that, or this guy already figured out his issues and didn't bother to let us know the fix lol

-Will

 

i dont think its a fuel issue i sprayed with the bottle closed only fuel went in and it went rich and did not effect the car however with the bottle open even with a 50 shot bank 1 goes lean and bank 2 stays ok and the fuel pressure dont drop but maybe 3 psi still above 40