anyone know if its safe to run platinum or iridium plugs in boosted application?
id stick with the stock ACs...dont get much better then those
GM's Time Attack Champion Cobalt SS/SC runs NGK spark plugs. Here's the complete list of GMs mods to the time attack cobalt to give it 283hp/243tq without nos and 380hp/387tq with nos:
Ecotec 2.0 ss engine, Eaton M-62 with 76mm(2.1:1 ratio) pulley, Siemens 5.64 g/s injectors; R5671A-10 V-Power with 0.025-inch gap; NGK spark plugs; Martin technologies port injection system; nos hardware; 10lb aluminum bottle, .020 jets, enabler and N20 temp controls; Armstrong race engineering dry sump.
WWW.MYSPACE.COM/BRETTHANSEN
Stock plugs are NGK plats.
Modds:
GM Stage 2 with SFPHQ 2.8 pulley
Injen Intake
GM Dual Pass Aftercooler w15psi Surge Tank
GMPP Exhaust Manifold
CTi 3" Downpipe and Cat
Custom 3" Cat Back with Dynomax Super Turbo Muffler
ZZ Engine Mount
ZZ Front Trans Mount
B&M Shifter
NGK BKR7E Plugs
DC Strut Tower Brace
Soon to be installed:
2.6 pulley, Siemens 60lbs Injectors, NGK 2 Step Colder Plugs
Tune Time Custom Dyno Tune
ah...shows i dont have a SS/SC....kids, dont assume,
a definite noticeable difference was realized after I installed denso iridiums in my cavy, dont care what anyone says plugs make a difference.
were the stock plugs new when replaced ??? or was there alot of miles on them ??
hmmm, shoulda stopped in here earlier.
it all depends on what you want. are you ok with switchin out your plugs a lot?
GTP guys usually use one of three plugs. most use autolite's. the cheap copper ones. our engines seem to like em pretty well, but the copper isnt good for longetivity and you have to change them 3 to 4 times as much. the stock acdelco platnums are good in these cars but it's a good idea to switch to colder plugs when adding more boost. the others, such as myself, are going with NGK irradium plugs. i just put mine in with the cam, and... well, they're spark plugs. i pulled them out last week, they looked fine. better than teh ACdelco plat's i was using before. platnum and irradium plugs clean themselves at lower temperatures, so you can run "colder" plugs in your car without worrying about them fouling. this is the big reason for running them in boosted applications. colder plugs are wonderful. if you dont know what colder plugs are, just let me know, i'll explain.
if you dont mind me askin, why are you changing plugs? if you've got relitively few miles on your car, and it's still in stock form, then the stock plugs are pretty much the best to put in there... that's why they're there
Andy
it's not how fast you go, it's how you get there that counts.
ZZP XP cam, 1.6 rockers, 105# springs, speedbuilt FWI, 3.3" modular pulley, TOG headers,
3" exhaust, flomatched injectors
'97 GTP 14.06@100.6mph pre cam w/ 3.5" pulley, I/E
