Spark plugs (
#11
Re: Spark plugs (
What ignition timing you need, and how much power you can push, before you detonate is one thing. It's based on compression, octane, etc.
What temp your plugs are is completely different. Too hot of a plug can cause detonation by becoing a hotspot (too cold, foulling), but colder plugs will not cure detonation if you have either exceeded design limits or have something wrong with your tune.
Average cruising speed of 120 doesn't make me worry. If you incessantly have to yam on the car from 80-120, and lack the self control to not make every one of them back to back WOT pulls, then I might worry. Do you have a dyno? Or failling that a datalogging cable + laptop and an EGT gauge? You can determine best timing and yank a little bit more timing out for safety.
What temp your plugs are is completely different. Too hot of a plug can cause detonation by becoing a hotspot (too cold, foulling), but colder plugs will not cure detonation if you have either exceeded design limits or have something wrong with your tune.
Average cruising speed of 120 doesn't make me worry. If you incessantly have to yam on the car from 80-120, and lack the self control to not make every one of them back to back WOT pulls, then I might worry. Do you have a dyno? Or failling that a datalogging cable + laptop and an EGT gauge? You can determine best timing and yank a little bit more timing out for safety.
#13
Re: Spark plugs (
Originally Posted by Joseph Davis
What ignition timing you need, and how much power you can push, before you detonate is one thing. It's based on compression, octane, etc.
What temp your plugs are is completely different. Too hot of a plug can cause detonation by becoing a hotspot (too cold, foulling), but colder plugs will not cure detonation if you have either exceeded design limits or have something wrong with your tune.
Average cruising speed of 120 doesn't make me worry. If you incessantly have to yam on the car from 80-120, and lack the self control to not make every one of them back to back WOT pulls, then I might worry. Do you have a dyno? Or failling that a datalogging cable + laptop and an EGT gauge? You can determine best timing and yank a little bit more timing out for safety.
What temp your plugs are is completely different. Too hot of a plug can cause detonation by becoing a hotspot (too cold, foulling), but colder plugs will not cure detonation if you have either exceeded design limits or have something wrong with your tune.
Average cruising speed of 120 doesn't make me worry. If you incessantly have to yam on the car from 80-120, and lack the self control to not make every one of them back to back WOT pulls, then I might worry. Do you have a dyno? Or failling that a datalogging cable + laptop and an EGT gauge? You can determine best timing and yank a little bit more timing out for safety.
the good thing is after switching to the colder plugs ngk-4554, the egt stays at 1500deg in boost, but when cruising at high speeds, it goes to 1900 plus maxed out the gauge scary. the car runs great and pulls hard as hell sc61 no lag during shifting which make suspected my compression being too high because of the head.
#14
Re: Spark plugs (
Iridium has a great following with the entire supra crowd. Many other boosted crowds are following suite. There's nothing wrong with using them at all.... Once you get past the cost.
The good news is they're much more resistant to damage than a copper plug. The bad news is you'll know it quickly when you're melting a $1-2 copper core plug.
One step colder on NGK & Denso plugs. More than that without running insanely large power is just a waste.
Their heat ranges are much wider per step than the "traditional American" plugs the 2 heat range rule is based on.
The good news is they're much more resistant to damage than a copper plug. The bad news is you'll know it quickly when you're melting a $1-2 copper core plug.
One step colder on NGK & Denso plugs. More than that without running insanely large power is just a waste.
Their heat ranges are much wider per step than the "traditional American" plugs the 2 heat range rule is based on.
#19
Re: Spark plugs (
Originally Posted by accordepicenter
exactly, stick to NGK BCPR7ES, low cost and heavy duty
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