my #4 cylinder is experiencing detenation. I am using a 75 shot of ZEX w/ a b16. The timing is retarded 4 degrees. Also a mugen chipped ECU. What can i do to cure this problem. (I want to keep using the nos)

 

Get rid of the mugen ecu, it uses crazy advanced timing.

Dustin

 

Another problem could be that injector is acting up, and causing a lean condition. Might try moving it to a differnt cyclinder, and see what happens then. Probably already know, but avoid #3. Also will have to get a couple of injector rebuild kits to reduce the chace of those injectores leaking, depending on the condition of the o-rings.