Nistune Forums

i am having trouble with my tune for my drag race only z31. the car keeps breaking up for about .7 seconds after each shift. i think it is loading up with fuel. any insight would be greatly appreciated. i need to get this figured out soon, my first points race is Sunday the 29th. here is a list of my mods:

8.3:1 vg30
holset hx35@18psi for now.
porsche 944 intercooler
HKS ssqv BOV
full radius cut valves and seats
.440 schenider turbo cams+ springs
pathfinder intake
MB 420cc injectors
Mallory 1:1 FPR @46psi base
255lph pump
~98 octane unleaded
cobra MAf
3" x 3ft long exhaust straight pipe. no muffler, no cat
zeitronix wideband
nistune on 84t ECU

attached is my .bin file any input is appreciated. Thank You.

Do you have a log file with AFRs showing when the problem happens?

i do not. i can tell you that i shift at 6400 rpm and as soon as i shift and get back on the throttle it starts to break up. i think i might have it too rich in the upper left part of the fuel map and it is dumping too much fuel in when i let off of the throttle during the shift. if i slowly roll onto the throttle it isn't as bad. And yes my BOV is recirculating to before the turbo after the MAF.

It looks like you have the stock vq map with cobra maf.