Spark plug suggestion high boost
11-20-2021, 05:54 PM
#1
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Spark plug suggestion high boost
I have missfire in high boost 30psi+ i have gapped my stock plug to .021 but still missfire il have 25k mile on my stock plug. Guys with high performance turbo what plug are you using 1 step colder?
thx you for your help
thx you for your help
11-20-2021, 07:06 PM
#3
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No its been there always in high boost i Will check my plug tomorrow but i think the plug is the problem... do you guys go 1 step colder in high boost if so what plug shoud i go?
11-20-2021, 11:15 PM
#5
I just replaced my plugs - 30K km’s. Whilst i was doing turbos. I couldn’t find an up graded plug one colder, so I just ran a fresh set of OEM. I am only at 25PSI, but I should have enough supporting mods shortly to start turning it up. I would like to get to 30PSI.
991.2 GTS with M800-GTS turbo’s.
991.2 GTS with M800-GTS turbo’s.
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blackcheetah (11-21-2021)
11-21-2021, 01:55 AM
#6
Yes, at least change your plugs.
Turbos and supercharged cars push the plugs quite hard, one of the reasons the 991.2 has a shorter plug life than the 991.1.
If you are upping the boost expect an even shorter life.
on my third set of plugs, but I track my car a lot....
Turbos and supercharged cars push the plugs quite hard, one of the reasons the 991.2 has a shorter plug life than the 991.1.
If you are upping the boost expect an even shorter life.
on my third set of plugs, but I track my car a lot....
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blackcheetah (11-21-2021)
11-21-2021, 04:00 PM
#7
Former Vendor
As others have said, swap the plug for a fresh set. It that doesn't work, start gapping them down. Typically 1-step colder is common over +100whp, but I don't see this to be the case with P-cars. Modern Iridium plugs are pretty darn good, and while 30 psi is a decent bump from stock, I've not seen a spark blow-out at that low of a boost pressure. I suspect worn plugs (damaged insulator?) or something else at play here.
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blackcheetah (11-21-2021)
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11-21-2021, 06:30 PM
#8
Rennlist Member
I'm going to make an attempt at sounding like I understand what's going on here but could it be a problem with the coil pack?
11-21-2021, 08:24 PM
#9
Former Vendor
Easy to troubleshoot, whichever cylinder has the misfire, swap that coil pack with another and see if the misfire moves with it.
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blackcheetah (11-22-2021)