NKC_280z Posted August 29, 2007 Share Posted August 29, 2007 Hello, I am in alittle bit over my head with the 300... I recently replaced the coil packs, the coil pack connectors, and the injectors on my 91 300zx twin turbo. I replaced the factory injectors with 660cc injectors. When I got it back the car had an erratic idle (It would go from around 200 rpm to around 1200 rpm). Also when I get to full boost the car cuts out. It feels to me that the car is hitting fuel cut or the timing is off. I know that since i bought bigger injectors the car will have to be tuned. I don't have any type of fuel management system other than the stock ECU. My question is: How do I tune the car (set air/fuel ratio or curve timing to get the car to run right). Or if I am totally off what possible issues could be causing my problems. Any help or suggestion is greatly appreciated. Thank you -Mike Quote Link to comment Share on other sites More sharing options...
mark Posted August 29, 2007 Share Posted August 29, 2007 If you can't tune it or have some one tune it, put the stock injectors back in. The larger injectors are dumping more fuel with each pulse. More fuel with out more air makes the car run rich. Quote Link to comment Share on other sites More sharing options...
monster626 Posted August 29, 2007 Share Posted August 29, 2007 if you want to run these injectors you have to either get a chip burned or buy a SAFC. You may want to stop driving this car if you choose not to take the injectors out so that you don't wash the cylinder walls and cause more problems. I would like to give you more information but i don't know you set up. I own a 300zxtt so if you have a question just ask Quote Link to comment Share on other sites More sharing options...
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