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SPARK PLUG BRAND & GAP FOR N/A??
- Thread starter Headless Horseman
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OP
OP
Headless Horseman
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Thanks! I don't want to want to waste anymore money.
WildHorse
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6510s for me @ whatever the gap is. .040" I think.
But my engine isn't stock, not cats , gen3 intake,
7800 rpm shifts, blah, blah. Smaller gap & 1-step
colder isn't going to hurt anything.
Some GM HEI went as high as .070" gap , most were .060" gap
due there high energy ignition.
ALL of Chrysler lean Burn ignition systems were .035" gap
However used a stupid amount of ignition lead.
Both systems were for 1 thing only, much leaner air/fuel ratios.
But my engine isn't stock, not cats , gen3 intake,
7800 rpm shifts, blah, blah. Smaller gap & 1-step
colder isn't going to hurt anything.
Some GM HEI went as high as .070" gap , most were .060" gap
due there high energy ignition.
ALL of Chrysler lean Burn ignition systems were .035" gap
However used a stupid amount of ignition lead.
Both systems were for 1 thing only, much leaner air/fuel ratios.
kz
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On the sparkplug subject - what's the difference between SP-548 and SP-589 ?
2018 Manual shows SP-548 (and that's what I installed), OP mustang shows 548 for 2011-2017 and 589 for 2018+.
2018 Manual shows SP-548 (and that's what I installed), OP mustang shows 548 for 2011-2017 and 589 for 2018+.
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WD Pro
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There was a lot of talk on this between @ice445 and another member (but I can't remember who sorry).
If I remember correctly, there was also quite a bit of info in this thread :
https://www.mustang6g.com/forums/th...tune-for-2018-gt.122943/page-173#post-3880389
I've not gone back through it all, but I seem to remember there being discrepancies between the spec, and what actually got fitted by the factory, and a backdated documentation change (related to part number and heat range).
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