Although I have had Nismo cams in my car for more than a year I hadn't had my car's ECU reflashed to account for them until this week. So far it seems to be running much better after the reflash.

Background: I had my ECU reflashed by Technosquare a couple of years ago after my last bolt on mod. Then about a year later I decided to install Nismo cams. After the cam install my car ran a little rough at idle so my local dealer bumped the idle to 900 rpm. After that the car ran fine for about six months until I started getting random check engine lights for a cylinder misfire. Then about a month ago at a autocross event my check engine light came on several times with a P0300 code (misfire).

Each time I reset my check engine light with my Scanguage it came back on while I was at the autocross. Since the autocross the check engine light hasn't come back on. However, a new local tune shop was having a grand opening last Saturday where you could get two dyno pulls on a dynojet with A/F readings for $40 so I decided to have my car dynoed. Not only did the car not make the horsepower I was expecting given my mods (260 rwhp) it was running very lean under 3,500 rpm and still lean up to about 5,500 rpm. Based on the dyno results I decided I needed to have the ECU reflashed again. Note: Once Technosquare reflashes your computer the first time they will reflash it again for $150.

Now I need to see if I can get it dynoed again for comparison sake. I will post my results once I have it dynoed again.

 

Hopefully you didnt damage anything running it lean like that for the year. GL let us know the results

 

Yea hopefully I didn't. I am really interested to see where it runs now after the retune. It was running as high as 16 below 3500 rpms based on the dyno results.

 

I finally got a chance this morning to get out and really drive the car. I'm sure the cool weather this morning didn't hurt, but the car feels like a entirely different car. It really pulls hard now from idle all the way to redline. More to come when I get my new dyno results.

 

what #s do you consider really lean under 3500 and lean til 5500?

 

See my post above. As high as 16 under 3500 rpm and really no less than 15 up to 3500 rpm. My really didn't get below 14 until 5500 rpm.