Tuning issue, AFR vary but power stays almost the same
#1
Tuning issue, AFR vary but power stays almost the same
Mods installed: Motordyne ART pipes, Injen v3 intake, AAM fuel return system stage 0, walbro 255lp pump, DW 600cc injecter (new filters and O-rings), HKS AFK with dual 02 sensors, Uprev osiris
Spent quite a while with my tuner last night and even though we managed to fix the tables from what they were originally, so the Z doesn't hesistate when starting and the powerband is fairly smooth now. But the issue is we can't pull anymore power and by this I mean that with HFC's and stillen v2 intakes, i made 296hp on a dynapack and after i installed the mod's above, i am only making 271 hp. The weird thing is that even when we adjust the AFR, my power doesnt change much at all. My tuner is stumped and so am i, anyone have any inputs on what could be causing the wall to where i can't produce anymore power? should i go back to stock injectors?
edit: nvm, the hesitation on startup is back, it'll fire over, drop to nearly dead, and then it'll come alive.
Spent quite a while with my tuner last night and even though we managed to fix the tables from what they were originally, so the Z doesn't hesistate when starting and the powerband is fairly smooth now. But the issue is we can't pull anymore power and by this I mean that with HFC's and stillen v2 intakes, i made 296hp on a dynapack and after i installed the mod's above, i am only making 271 hp. The weird thing is that even when we adjust the AFR, my power doesnt change much at all. My tuner is stumped and so am i, anyone have any inputs on what could be causing the wall to where i can't produce anymore power? should i go back to stock injectors?
edit: nvm, the hesitation on startup is back, it'll fire over, drop to nearly dead, and then it'll come alive.
Last edited by nismofreak1208; 05-06-2012 at 09:16 PM.
#4
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true, and i see your thinking but to eliminate any variables i say put stock ones back on and see if it does the same thing. Some times the things you never would think of being a problem are the problem.
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#9
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Did your tuner adjust for the new injector? In the Uprev manual it explains how to setup non stock injectors. How much are you changing the A/F ratio and expecting a change? Also from what ive seen (On HR motors at least.) NA Z's seem to respond more to ign timing changes more drasticly then fuel. Going from 12-13 A/F wont make much of a change.
#10
The software has been updated for the bigger injectors and my timing is already pretty aggressive from my first tune which netted me my first power goals. Now i've lost a considerable amount of power with products that should have at least added a few. At one point, my A/F went to 15-16
#11
The software has been updated for the bigger injectors and my timing is already pretty aggressive from my first tune which netted me my first power goals. Now i've lost a considerable amount of power with products that should have at least added a few. At one point, my A/F went to 15-16
You can also have problems at engine with such a/f...
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