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Old 03-09-2019, 10:02 AM   #1
tittle
 
Drives: fast
Join Date: Nov 2018
Location: LA
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big turbo, misfire

Hi, first of all, the mod list:

new forged engine
efr7163 turbo(.80 t4 twin scroll)
custom exhaust manifold(42mm inside)
zzp cam
ngk spark plug 90543 ILTR7E9(0.035")
zzp air intake kit
zzp intercooler kit
AEM water-methanol injection kit
premium fuel

Just after I finished my big turbo plan, I tune it with HP. It was really strange that if the pressure was 22psi, everything is ok. But when I tried to increase the pressure level, then the car started act like misfire since WOT. The exhaust sounded like "pop" and "boom". I've checked the fuel pump pressure (in-tank) and it's ok, the spark plugs were new and the coils were good. I can't figure out what's the problem. Maybe the exhaust manifold is too thick?Or the turbine house is too big?Did I need to re-gap the spark plugs?Or chane the fuel pump with a high flow one?

I really need some help.
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Old 03-09-2019, 10:05 AM   #2
Gutling
 
Drives: 2017 Chevrolet Camaro 2.0 LT
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Im not sure gap or heat range on sparkplugs you should be using, but increasing boost may be blowing out the spark and causing the misfires. Just a guess, maybe try closing the gap and seeing if any difference?
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Old 03-09-2019, 10:15 AM   #3
parish8

 
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v8 here. at 20psi I was getting spark blow out at .028. I took them all the way down to .020 and that fixed that problem. then above 6500 rpm I was getting a hard miss and that was valve springs. I had good springs but they were not installed at the correct height. once they were shimmed properly that problem went away.
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Old 03-09-2019, 10:30 AM   #4
cooper1965
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I don't have any experience with the particular plug you are running, but I successfully held 24'peak psi with NGK 6510's, gapped @.028, with no misfires on the stock turbo, before switching to a non-projected tip style plug.
Also, posting a log in HPT could be helpful as well. Might be a fuelling issue.
But, your gap is definitely on the high side.
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Old 03-10-2019, 12:35 PM   #5
Jason@JacFab
 
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Sounds like spark blow out. I've had it a couple times. I've had good luck getting rid of it taking my gap down to .029"
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Old 03-18-2019, 12:08 PM   #6
zts1986
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Quote:
Originally Posted by Jason@JacFab View Post
Sounds like spark blow out. I've had it a couple times. I've had good luck getting rid of it taking my gap down to .029"
Which plug are you gaped at .029" with? I'm trying to decide between the NGK 6510 (LTR7ix-11), Denso ITV20, or Brisk Silver Racing RR14S. Not sure which direction to go in, but from what I can tell all three of those are one step colder than factory, which is where I think I need to go.

I have the RaceChip installed on my car and that's it, performance-wise.
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Old 03-18-2019, 06:38 PM   #7
Gibspeed3
 
Drives: Cadillac ATS 2.0T
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I would never run a gap larger than .028 even on a stock car and would be down in the .024 range or lower in your case, depending on your target boost. I run 6510's at .026 at 22+psi, but on stock turbo.
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