I have added aem cai, bhr midpipe, bhr coils, aluminum flywheel. Would it be necessary to reflash pcm (ie Cobb AP) or could I run on stock fuel maps with these mods. Performance has been sporadic with mis fires at high rpm.

 

to search, that is the answer

 

If you have BHR coils, I think it would help if you adjusted the dwell settings with the AP.
You will most likely gain some HP, also.

Necessary? No.

 

Excuse this rant.

I think the coil dwell is fairly important. In the stock calibration, the dwell gets very short at high rpm. I think the engineers knew exactly how badly the coils sucked, and that they would overheat on the first test drive if charged adequately. Mazda just got stuck with what their keiretsu had.

It might have been okay, but then the mixture was set stupid rich to protect the cat. With .9ms charging time, the coils probably couldn't kill a mosquito, let alone light off a 10:1 mixture.

So, you get misfires which, ironically, dump raw fuel on the cat and melt it down double-time.

I think all RX-8 owners should have the option to fix these issues at a minimum cost, and it doesn't take a "custom" calibration to correct these issues.

 

I have the MA CAI, Greedy SP2 cat back, BHR coils, BHR flywheel and a Walbro 255lph fuel pump and then added the Cobb AP with MM tune and it was worth every penny. I also used to get the misfire code at high rpm until after I got the Cobb. The car runs smoother throughout the entire rpm range now and no more misfire codes. If I did it all again the Cobb would be my first purchase.

 

I like how you think having random mis-fires is ok... you need to address that before you go super JDM dorifto on us.

 

Can you please fill us in on how you worked that out ..... cheers