Ok i am upgrading my spark plugs in hopes to yeild a little better performance since i have my intake.

i am looking at picking up Bosch Plat +4, they are around 17 bucks a pack and look to be good, there is also NGK iridiums. whats reccomended and what should i pick up?

 

NGK BRK7E Copper Spark Plugs, they are good plugs, run a step colder, but are copper, so you should replace them every 7500 miles or so.

 

Which is why you go with the Iridiums...which is what I have. And they are also a step Colder....

 

What is the performance effect of running colder plugs?

 

so far supercharged guys have spoken, i have heard that step colder is not good for NA cars

bump

 

yea dude i was thinkin the same thing

 

i need some answers here lol

 

Go a step colder for every 100hp over stock that you run.

Ive always had the best luck with regular copper plugs although they need replaced more often.

 

Thank god witt is here...

what do u think of the bosch plat +4, i dont beleive they are any step colder...

also..what do you recommend..current mods are KN SRI intake.

bump...

 

I'm running the platinum 4's and have been for about 15,000 miles. No problems. After installing I wanna say the idle felt a little smoother, but it was probably in my head. I didn't notice any gains, if you were wondering.

 

I've heard the platnium 4's are a waste of money....I say with N/A just stick with stock to be honest I really don't see a point....with FI or nitrous I do though...

 

Platinum plugs = longer life but less conductivity. They also tend to not dissapate heat as quickly.

As far as best conductivity and heat dissapation copper is the best, however the life span of the plug is very low.

Iridium is somewhere in the middle of the two... I use iridium in my car because I don't want to have to change the plugs all the time plus I don't run my car hard enough to justify getting copper plugs. If you are going to be running at the track all the time copper is probably the best.

AND... as Witt said... go 1 heat range colder for every 75 - 100 hp increase. Is an intake all you have done to the car? If so, I don't think going to a colder plug is going to be beneficial at all. Going with a colder plug simply helps lower combustion chamber tempuratures, it will not net you an increase in performance unless the car is already pulling timing because of knock due to high combustion chamber tempuratures.

 

ah ok, so the bosch plat +4 wont be good b/c they are platinum...now my question is..what copper plug would u reccomend? i do run my car hard

 

You won't notice any performance increase on a stock engine by changing spark plugs. If your's are worn out, just replace them with the stock ones......just my opinion.

 

I have two step colder plugs on my car, BKR7E's

My engine runs fine with them, and I don't mind changing them out a couple times a year (at 8 bucks a set they're cheap)

My idle got a little more rough afterward, but performance characteristics did not change from the ass-dyno

 

+1 to everything here.

Edit: Non resistor race plugs are also an option. I had them for a while but nuked a coil pack. Thought it might have been the plugs but it ended up being spark dwell settings being a bit too liberal. Ecotec heads seem to absorb the extra noise generated fairly well as I had no ill effects and plan on installing the 3 range colder non resistor NGK plugs tomorrow.

 

sorry for the thread jack projekt, but i need to replace my plugs too.

where would you be able to get iridium plugs? can't seem to find anything up here in MN

 

I am running bosch plat +2's

I replace mine every other oil change...

 

delco platnums, the P/N is in your owners manual. your really dont tneed anything special. and i've always had bad luck with bosch plugs

 

I am having no problem what so ever but I may go with copper plugs next...how long do they last?

 

well I usually get plugs from NGK dot com. prices are pretty reasonable and they are pretty quick at shipping out.

 

yeah i think i am gonna pick up some ngk plugs, i am just replacing them cuz its been around 20,000 clicks.

 

im at 42K clicks and no probs with my K&N SRI. but if you wanna replace em. id say NGK is great

 

I say stick with original equipment ac-delco iridiums, part number 41-103 according to the dealer, at autozone for $7