anytime i boost above 5k my car misfires like a bat out of hell. what could it be?

im running 6-7psi on a single turbo setup.

my afr is rock solid at 11.0-1 under boost
timing is around 15 degrees at 7psi

running a haltech e6k

ive changed plugs, wires... coils are all withen spec.

any ideas?

think an ignition amp would fix this?

 

Did this just start happening out of the blue or what?

I've got the same exact problem except that I'm still running the stock twins(non-seq) with an MSD6A Amp. The guys at Gotham are looking at it as we speak. I'll let you know what we find.

 

no, an ignition amp will just amplify the spark
you shouldnt be having problems at all with ignition when you add an amp

it sounds like a poor tune to me of course check your coils per the manual wires and plugs
plugs can foul fast with an improper tune

 

Might want to look into getting an HKS twin power ignition. My friend with a T78 had bad misfire problems until he got that. cleared everything up.

 

didnt just start happening, i had this problem with my old setup and usually a plug change would fix it.

however its doing it at low boost now with the single turbo

I would say the setup is tuned pretty well, I put it on my dyno and had my dyno hold the car at every 500 rpms while i tipped the throttle through all the load points and tuned the afrs.

the timing map is the same one i used to use (one of magnus's) but i just dropped the degrees back a few.

i have the coil charge at 3.2 ms

while i had the engine out i checked all the coils to make sure they were withen spec.
i replaced the wires with stock ngks about 5000 miles ago
and i changed the plugs out two days ago.

so you dont think this is a problem that a amp would fix?

 

the amp may cover up the problem
you see what I mean?

Why did you go with stock plug wires? Id have gotten some 10mm just for an upgrade since you are running like 1.5-2x the stock hp.

Sounds like a grounding issue make sure you put every ground back including the 2 near above the dp area. Add a couple grounds as well.

how old are your coils?

-Yanni

 

I dont suppose its a grounding issue since ive run a homemade grounding kit, although I will recheck them tomorrow

I assume the coils are stock, which means they are 68,000 miles old.

I should have gotten upgraded wires, but i wasent really planning on going single at the time... however i should have been more aware of my addiction :P

If the amp "covers up the problem" wont my problem be gone?

could it be my ecu?

 

switch out your leading coil with someone first

my friend had a microtech ecu I think and he didnt have the latest software upgrade and had a huge misfire at 5500 or something. It could be that but I think it could also involve tuning.

no, your ignition should be firing perfect and then the amp will make a more powerful ignition in the chamber. There is no reason at all why you should have breakup at low boost with your turbo. Theres no way you're making as much power as twins at 12psi and everyone runs that on stock ignition with no problem.

I have a feeling its in the tuning though.

 

Doubt it's a coil issue, however, the service manual shows how to test them. Pretty easy.

Looks like my ignition breakup problem might have something to do with the trigger angle sensor and/or trigger wheel.

 

yeah i know their is no reason i should have breakup at this power level. you keep saying tuning though. what in my tuning could be off? I have a wideband in the car and my afr's are perfect. timing is pretty much a no brainer and im just running wastegate boost.

I tested all the coils with a multimeter and they were all withen spec to the fsm.

I put a ferrit choke core on my cas wire to help with noise.

maybe ill bring the car to demetrious sometime soon and see if he cant figure out whats up.

 

mind sharing what solved this issue for you?