Last post on Dec 04, 2008 at 8:08 PM
You are in the Speed Shop Tuning and Modification
What is this discussion about?
Nissan 350Z, Nissan 370Z, Performance Mods, Engine, Fuel System, Coupe
#42 of 45 Re: my 350z is letting my nissan pride down [03nissan]
Nov 10, 2007 (10:38 am)
I'm glad to hear you got the cold plugs! It sounds to me like your O2 sensors are probably not broken. The low and slow readings are to be expected, when your mixture is too lean. That just means the sensors are doing their job. When the mixture is corrected, the sensors will read faster and the levels will be higher.
A stock reflash would just reinstall the original specs into the computer, and that wouldn't change your fuel mixture. But maybe you were referring to reflashing the computer with a higher performance map for the fuel mixture. I don't know if that is an available option. If there is a reflash of a modified fuel map out there, it would cost less to install than a fuel management programmer. But the fuel management programmer would allow you to adjust the mixture to get the best performance, while the reflash would lock you into whatever mixture settings were written into it. If the reflash specs were intended for an engine with just bolt on modifications, like you have, it would probably work OK; but if it was intended for a supercharged or all out race motor, the mixture wouldn't be right for your needs.
#43 of 45 Re: my 350z is letting my nissan pride down [zaken1]
Nov 10, 2007 (1:41 pm)
After writing the note above, I did some checking around, and found that there is now a fuel and ignition controller made for your car by AEM, which is made to connect to the car's stock computer. It can change the injection pulse width by infinitely variable steps, up to an 100% increase. And that should enable precise setting of as much additional fuel as you'd ever need! It also allows retuning if you make future modifications to the engine. Because this controller works in combination with the stock computer, it is much less expensive than a stand alone unit. It will probably need to be initially programmed by connecting it to a laptop or desktop PC. AEM developed this part for the 350Z, so there is no question about it working well. The current ones may need to be hard wired into the vehicle. They're talking about making it a direct plug in system later on.
Summit Racing has this unit in stock under part number AVM-30-1910, and sells them for $397.95.
#44 of 45 Re: my 350z is letting my nissan pride down [zaken1]
Nov 11, 2007 (11:55 am)
thanks 4 looking up on that for me. i appreciate it and i will keep that in mind