Actually - I know of several who have had issues . Bad coils are not uncommon.

 

Misfire Video!

Its not throwing any CEL, no flashing no nothing but my dyno chart is all over the place up top. We stopped at 7.2K RPM

@28 seconds

 

If AFRs are anywhere between 10.5 and 13.5 while that happened it's likely ignition .

Gunna post the dyno ?

 

Yeah give me a sec,

A/F where at 13.8. Then held steady at 12.

Once it started misfiring A/F gauge went crazy.

 

God that sounds like heaven...except for the misfiring part.

 

So who can help me out here.

What is the plug gap, I am seeing and hearing a lot of different things

Notice some people gap trailing differently then leading.

I was told .044, and notice my leading plug was well above .05 which I would think would cause a misfire problem.

 

Put factory ignition on it, if it resolves then we will test and tune for BHR.

No reason to drive yourself crazy yet, it may as simple as the acceleration timing maps being crazy. Or my favorite the knock sensor FINALLY working when you don't want it to.

 

Well I just re-gapped them all down to .044 and took it for a drive, smooth all the way up until 9K.

So I will wait till I can upload my log tomorrow, until then fingers crossed that it was just a gap problem.

Sorry Kane, just saw your post.

 

Do you have stock dwell timing ?

 

Yes, I have the stock Cobb AP map installed

 

ahhhh well ............
this looks like another example of why those coils are not good on stock dwell .......

 

We will see how they hold up with the proper gap, all my plugs came at .06 whish is the maximum tolerance, seems strange though.

 

Dyno Results! Old numbers are in black 186WHP, New numbers are in grey 160WHP @6.8K Torque increased by 7 at its peak.




Also here is a picture of one of my plugs with 800 miles on it



Also made my own premix kit, just because.

 

Heres my log from the pull. (Zip File attached)

 

Not bad. Did you back off because you are still breaking it in?

 

Backed off because it starting misfiring at 7K, which I believe I fixed.

Also note, I guess the guy plotted my log on the wrong template last time leading to 230WHP (5th gear), his new template is an accurate representation of what a dynojet would read and he adjusted my old number accordingly. The 186WHP was actually 214WHP (4th gear) without the correction template.

 

I still can't figure out why you would run the stock dwell table on bhr coils when you have the ability to flash the correct table.....

 

Because I don't have any other table, nor have started tuning yet. Tuning starts tomorrow.

I was not expecting much from this pull, but I wanted a starting point. I may have wanted a better starting point but now I have something and know where I stand and what work lies ahead.

 

Dwell on BHR would not cause ignition breakup of an NA motor.

Check the grounding, and I'll look at the logs in a second.

 

He had breakup then solved that by reducing plug gap so ...... not enough energy for a spark at larger gap .

I would be very surprised if increasing the dwell (or fitting stock coils) wouldn't have fixed that .

 

Yes, but the resistance to ground would cause same lower power to the plugs. I'm just saying in my experience I've never seen a BHR coil misfire NA, however I've seen a LOT of shitty grounds cause misfires. Obviously I'll still tune for dwell.

 

Fair enough .

 

I moved the BHR coils to ground at a battery point, not chassis.

 

Side note, finally got ride of those squeaky OE brakes, these should get me through until I find the time for a BBK

(I know the wheels are terribly dirty, car needs a good detail this weekend)



Also depressingly enough just turned over 30K on the chassis and 1K on the motor



In other news, my canisters get delivered today, so the engine bay should be all set by the end of the weekend.

 

the right dwell for those coils are posted on the forums by oltman....