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Showing results for tags 'nistune'.
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OK, So heres what im dealing with right now. My rb20 is having some weird issues running, Idle is good at a 14.7 AFR but under load/driving is where I get problems. Upon initial acceleration or low rpm`s the engine has little power and runs like its missing a cylinder or two with afr`s dipping into the 10`s then as boost comes on it runs normal for a bit like it should with afr`s towards 12-13`s and as the rpm`s raise and I hit full boost it will sputter and pop as it leans all the way out untill my wideband cant go any higher (18+ afr`s). So far I have checked everything manually and also through nistune and I still cant figure it out. Here is my current setup: Stock RB20DET and stock turbo Z32 MAF Nistune chipped ECU RB26 444CC injectors (and resistor wired into the harness) Walbro 255 fuel pump Nismo FPR AEM Wideband I have checked the timing and its at 15 deg. Fuel pump has good power and ground. All injectors are opening/closing. All coilpacks work (I pulled them with the plugs and spun the CAS to double check). ECU dosent pull any codes. Fuel pressure isn`t dropping off. TPS voltage is good. Plugs look good and are gapped to the reccomended .8, The MAF readings look linear and accurate from what I can tell through nistune. If I go into nistune and bump up the fuel it just runs richer in the lower rpm`s and still leans out and pops. The only things left I can think of is a bad MAF, Low voltage to the pump under boost, A bad ignitor for the coilpacks, or possibly a bad CAS or something. Any help would be greatly appreciated because I dont know what else I should check at this point lol.
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I have recently rebuilt the VG30E that is in my 1985 300zx, NA and automatic. It was a stock rebuild with a rebuild kit except for the cams, which were replaced by a Wolf Technologies AZ314-000S1. Because of the new cams I also opted for a 1987 ECCS with JECS#: A18-679 M83 with nistune installed. The engine has been assembled for a couple weeks now and it's still having problems. It will fire and it seems like the timing isn't set right. We have gotten it to run long enough to hopefully break in the cams, but it has rpm fluctuations under throttle and wont idle. The current thinking is that there is a problem between the new ECCS and the 1985 wiring harness but we have tried changing some pins that we thought were incorrect, like the injector wiring into the ECCS, and it performed worse after. We are back where we started. There is also a possible problem with stock map installed with the nistune software and whether or not that is affecting it. We are using the stock bin file for a 1988 NA automatic and don't know if that could be causing a issue Any help or advice would be much appreciated. If there's anything else that would help find a solution, please ask and I'd be happy to answer.
