Spark Plug Technical Info
03-02-2007, 11:42 PM
#13
2nd Gear Member
Join Date: May 2006
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Posts: 172
RE: Spark Plug Technical Info
what bout my 97sixerwith CAI and flowmaster dumps(no cats and no res)...needs to withstand some heat(currently overheating but whenever that gets fixed just to let ya know it has a 160 degree hypertech thermostat in it)
11-07-2007, 01:32 PM
#17
1st Gear Member
Join Date: Jul 2007
Location: CA
Posts: 76
RE: Spark Plug Technical Info
ORIGINAL: Sparkplugs.com
At 220 over stock, you're going to need to go two steps colder. Usually I'd recommend NGK Iridiums - they're basically the same as Denso's, and half the price, however, the only comparable plug that NGK makes two heat ranges colder has a .039" gap - your oe recommended gap is .054", so the plug can't be gapped that high. Denso has an iridium that is two steps colder - ITF22 - and the factory gap setting is .044". I'd recommend those plugs, start with the gap setting at around .052" - if it misfires, close it down a little more, but you shouldn't need to.
At 220 over stock, you're going to need to go two steps colder. Usually I'd recommend NGK Iridiums - they're basically the same as Denso's, and half the price, however, the only comparable plug that NGK makes two heat ranges colder has a .039" gap - your oe recommended gap is .054", so the plug can't be gapped that high. Denso has an iridium that is two steps colder - ITF22 - and the factory gap setting is .044". I'd recommend those plugs, start with the gap setting at around .052" - if it misfires, close it down a little more, but you shouldn't need to.
I got a set of NGK 2771, and they are cross referenced to Denso T20PR-U, which KB recommends. I installed the NGK gapped at 35 but the car ran like ****. Later I re-gapped them to 50 but car ran a bit better. When I took them out, the tips had a slight coloration as if there was a larger spark and alot of heat.
What should I do?
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