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Originally Posted by zinner
datapoint: my tuner/shop asked to put in M3 plugs as part of the install of a stage 2.
Also looking at your n54 thread you are setting the boost to 20 psi ? That is quite high for 91 octane no? I think misfires with the stock fueling and high boost are a bit of an unspoken issue amoung the tuners.
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I don't feel that colder plugs are the answer. I was told previously to switch to the s63 plugs which are a step closer and yielded no results. My problem ended up being the flash tune itself was the issue. As always, wether it be piggyback or flash a couple of things have to be in order.
- plugs
- coils
- injectors
- walnut blast
All of the above is contingent on miles on vehicle.
If you feel it's an octane problem and timing is too advanced just boost the octane with some e85 mix or classic over the counter MMT. Some 76 gas stations sell 100oct.
My spark plugs were best kept stock and tapped down.
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