Nistune Forums

im just spit-balling here. transistor has blue wire green with black and a black wire the black wire is a common ground green with black is the trigger and blue is the switch. blue goes to the negative on the coil and back to the ecu. green with white is the 12v feed to the coil. the ecu triggers th...

I was always under the assumption that if you increase the compression ratio it would need more fuel. But it does make since that the same volume of air is entering the cylinder. Just getting squashed down just a bit more.

i cant seem to find this info anywhere. its not really nistune specific but. how does increasing compression ratio effect the needed fueling.

so if i raised the compression ratio from 7.8 to 9.0 would it require more or less fuel?

once my exhaust comes in i will have the afr to tweak this right. the engine was just rebuilt and i followed the FSM for bolt torques unfortunately they might not have been tight enough. the seemed pretty loose when assembled. as of right now its running in its stock form. and so far it seems to be ...

over the weekend i swapped the 440cc injectors with the stock 260cc injectors. while doing it i noticed i had a few loser than liked bolts holding the lower intake manifold on. it might have been leaking air. welp. :evil: currently it is running fairly good. but maybe once i get my afr meter hooked ...

Thanks for the help Matt. i think im just going to put my stock injectors back in and call it a day. im not sure whats going on but something is not right. im starting to think these injectors are just not good. this is a stock motor so i dont think im ever going to need bigger injectors.

i just want to make sure im doing this right. what should i be selecting for my vehicle? the 86 address file or the 88-89? if i select the 86 and then load the 26p00 firmware the scales are all over the place. Should and can i load a feature pack address file? and the problem started with the inject...

What is your boost sensor fuel cut set to at high rpms?

PS. cant download your file is it attached correctly?

Just wanted to update that i sorta have it working better. i have disabled the O2 for now and built a new map based off of some others out there. im going to need to drive around and see if i can get the fuel trims back to 0 and see if my low end breakups go away. i have noticed if you mess with the...

Im starting to think the 86 ecu is a bit garbage. are you saying the tim firmware is available on different z31 ecu's and not the 86? im not sure what im doing wrong but i just cant get this running right. the full range from 700 rpm to 3200 rpm is most times a mess.if i cruise on the highway i can ...

if i ordered a new nistune board im guessing it would come with the new firmware? and would a k value of 260 and a latency of 1250 sound off for suspected 420cc injectors? i cant get great info about them but people say anywhere between 380cc and 495cc. i'm getting pretty close to putting the stock ...

What do i have to do to get the TIM feature? i dont seem to have that option. im currently having a hell of a time getting it idling good. its all stock except its a na block and euro/nismo cams. and merc 036 injectors (420cc?)

I just noticed that i forgot to mention it is an 1986 model with same year ecu.

and also i have noticed that the rom image listed for Z31_VG30ET_1986_19P03_MT.bin is the same as Z31_VG30E_1986_18P03_MT.bin and i suspect that is in error.

This was a na2t swap using a no turbo block. I swapped the auto turbo wiring into it. And luckily I'm the electronics guy. I was just curious if you had seen any difference in the na ecu or t ecu. I'm thinking the na ecu does not have the speed signal circuitry. But I will check that code. I do reme...

The factory service manual is a bit hazy on how the 2 idle controls operate. but im not sure if my problem is related to the turbo idle controls. or the lack of the auto trans that used to be in here. during warm-up i get idle speed hunting where it drops down to about 500 and pops back up to 1000 r...