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C63 AMG E85 EC V7 tune - need proper plug gap

Old Oct 30, 2020 | 09:22 PM
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C63 AMG E85 EC V7 tune - need proper plug gap

Got oem plugs which are gapped around .039-.040.

ive looked everywhere and the best info i could find is in this thread. Doesn’t seem like there is anything more informative on the forums or Google for the M156.

https://mbworld.org/forums/c63-amg-w204/414257-brisk-sparg-plugs-m156-weistec.html

QUOTED

Quote:
Originally Posted by Muskoka_AMG
What do you guys gap your plugs to?
I got this instruction straight from Weistec:

"
Failure to properly gap spark plugs will cause misfiring or pre-ignition. Please follow instruction carefully and use best mechanical judgment.
5. Gap new spark plugs to .032"-.038" depending on power Level.
• Stage 1 .038"
• Stage 2 .035"
• Stage 3+ .032"
6. Reinstall spark plugs, coils, and air boxes. Be sure to plug all wiring in. "


Question is: Does anyone know if this holds true for an oem plug that is not one step colder?

I’m running said tune in title with advanced timing for Ethanol.


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Old Oct 30, 2020 | 09:24 PM
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I’m guessing .035.

for reference it looks like the previous plugs were gapped around .032 - .034.
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Old Oct 30, 2020 | 10:00 PM
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I’m running stock plugs with no issues. Never replaced them
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Old Oct 30, 2020 | 10:10 PM
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Originally Posted by thebug44
I’m running stock plugs with no issues. Never replaced them
are you on an advanced timing map with e85?
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Old Oct 30, 2020 | 10:24 PM
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That gap is from weistec a site. Your n/a. Run .40 gap.
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Old Oct 30, 2020 | 10:30 PM
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for a non boosted non nitrous engine factory gap and factory heat range plugs are what you should run.
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Old Oct 30, 2020 | 10:55 PM
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.040 oem gap it is
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