Hello fellas, long time without postig here.
We have been struggling on th dyno for days triying to find out what is causing the misfire.

The car is running 16 psi of boost on the gt4202 the car have a very nice power curve we peak 475hp but we didt decide to turn the boost up untill we found the cause of the misfire, we have a microtech lt16s, m&w cdi with 4 cdi coils, magnecor r100 cables and nkg 10.5 spark plugs.

It doesnt matter how we adjust the tune and change spark plugs the misfire persist there between 7k and 7.5k rpm, we check the 4 coils and the 4 are firing, i dont know if 1 of the coils at high rpms fails, or maybe i have a faulty spark plug cable.
Ill appreciate some tips ot thoughts of what can be happening

 

it's the coils, borrow from a friends 4 other coils and try again. that or the wires.

that is my opinion

 

i had a similar problem, totally different setup, but we were getting interference from the CAS pickup, turned out to be a shielding issue.

do you have a data log of a pull with the rpm data? ours would go from 7400, to 7800 then to 1,500, 6k then back to 7400 (more incriments but you get the point)

 

you didnt say what coils your using

 

Hello actually at first we have the shield issue with the cas pick up, and you can see on the microtech dash theat goes on crash mode, we do the shield mod and all fine, but know we have this annoying misfire issue.

I talk to ernie he told me that have the same problem and end up replacing the 4 coils and problem solved.

We are using m&w cdi coils the ones they recommended for the sistem.

Il have to buy 4 new coils wtf...200$ dollars more
will let you know if that solved the problem

 

what gap on the plugs?

 

these ones ?
http://www.mwignitions.com/coils.htm

I have a M&W system as well and used the on in their documentation. the lX92's **** load more expensive again

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