NefMoto > Technical > Tuning > Missfire on 2.7TT with K04
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Author Topic: Missfire on 2.7TT with K04  (Read 2529 times)
BlackT
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« on: August 25, 2021, 12:50:05 PM »
Short long story. Two stock 2.7TT(ARE and BEL) with K04 and TT 386cc inectors.
When I try to get some boost 1.3-1.4 bar I get missfire. I hold it about 0.75-0.8 lambda
Spark plugs new are from RS4 NGK 7Q , coils have about 10-15k
Do I need to play with spark plug gap or something else?
I never have much problem on 1.8T with missfire, even with older plugs and coils. So I don't understand why these two 2.7 make such problem.
Also with some other stock 2.7 I have some missfire, like the parts(plugs and coils) need to be in better condition than on 1.8T with same HP per cil.
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vwaudiguy
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« Reply #1 on: August 25, 2021, 11:45:27 PM »
What are your plugs currently gapped to?
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BlackT
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« Reply #2 on: August 30, 2021, 12:05:34 AM »
0.75 mm
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vwaudiguy
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« Reply #3 on: August 30, 2021, 12:29:07 PM »
Try going down to .022-.024"
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thedrill
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« Reply #4 on: August 30, 2021, 12:40:00 PM »
You dont need expensive spark plugs on the 2.7t motors , The motor is happy with cheap NGK BKR7E copper plugs gapped at 24 thou, if you are running any kind of higher boost.
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BlackT
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« Reply #5 on: August 31, 2021, 01:46:08 PM »
Coil problem, strange, on both engine coils fail after I put more boost. After that even on stock boost they make missfire
I am putting NGK U5013 on both engines.
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Blazius
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« Reply #6 on: August 31, 2021, 03:00:07 PM »
Quote from: BlackT on August 31, 2021, 01:46:08 PM
Coil problem, strange, on both engine coils fail after I put more boost. After that even on stock boost they make missfire
I am putting NGK U5013 on both engines.

What coils are you running,tfsi ? Btw rs6 coils have bigger heatsinks and coils than tfsi coils afaik, if you wanna give em a go.
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prj
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« Reply #7 on: September 01, 2021, 07:21:03 AM »
If the coils are TFSI converted then the dwell time needs adjusting, otherwise the coils will blow very fast, as the dwell time is almost double that it should be.
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BlackT
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« Reply #8 on: September 13, 2021, 12:26:34 AM »
Yes I know about dwell time
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