i am wondering how cold of a plug i should use on a stock ls1 with a 232/238 cam and a d1sc at 10lbs of boost. i tried looking up heat ranges for ac delcos but i cant find anything for iridium plugs, all i know is the stock part number is 41-110. i also read that ac delco does their heat ranges backwards. Can some one clear this up please. thanks

 

I am using NGK TR7's gapped at .30. I have a stock LS1 on 8psi and the car has a 226/232 cam in it.

 

TR6 is what I've always run.

 

NGK TR6's will be good at 10 psi. I ran TR6 plugs up to 15 psi.

Also you do not want to run a platinum or iridium plug on a boosted car

 

Br7ef non projected tip. There is no Hp advantage to running a hotter plug, only less safety.

 

what do you guys think about my ngk tr55 ix plugs and msd wires at 15lbs with meth and e85? i would not have asked if i had not seen this post....it was the most expensive ws6project had so thats what i got. a year ago.

 

I know whats up with the hot/cold but we used to run iridium in our high compression racing engines, why aren't they supposed to be used in lower compression turbo engines?

 

Ditto on that,a big time local tuner( tuned funny cars for one of the top dogs and others) that used to be in my area ran iridium plugs in his 1000whp fox. 03-04 cobras ran them and I'm almost positive the zr1 has them.as far as tr55 are concerned that's a good question. My car at 4psi it's fine but I'm putting tr6s in before I turn it up

 

I say all forced induction cars should run the "tr8" plug. Part number r5724_8. There is no down side and they are the safest. I know you can get away with a tr6 at that level,but why?

 

Remeber the colder you go, most likely chance you will have to replace them sooner. The colder plugs do not clean themselve's like warmer plugs. This means if you run race gas alot, carbon builds up quicker.

 

ive used stock plugs up to 12-14lbs no issue, after that they get angry and i goto a TR6

 

we are running tr6s on anywhere from 10-24lbs of boost on 4.8-6.0l turbo cars on pumpgas or pumpgas+methanol 70% mix

they are awesome.

 

i run the br7es because i had them with the nitrous. no problems. figure they are slightly safer.

 

what gap is everyone running. I've used tr6 anywhere from .028 to .036

 

i figure tr6 or 7 will work for me, i want to stay on the safe side though and fyi ive spent all morning watching video of your turbo fairmont...i have a flawless 02 z28 and would almost rather drive that, i think something might be wrong with me but loved that car!

 

for 20lbs we have found a tr6 should be 24-26, it blows out spark over 23-24lbs of boost.

for 14lbs 30 works great.

 

haha wait for 2.0 its even nicer.

 

br7ef at .028

 

This X10000000000000000000000.

If your having them "wear out" faster, bump the timing up in the low kpa and idle regions.

There is so much misinformation on this subject because someone's brother's, sister's, uncle's cousin ran 1000hp with stock plugs or TR6's.

I use to think projected tips were fine in a boosted motor and even argued the point with people I know now who were right.

Non-projected tip plugs ALWAYS in a boosted or nitrous application no matter the boost level.

I'd run a BR7EF, but if your worried, lazy, or don't have access to tuning software to add the 2-3* timing it would take to make them run exactly the same as a stock set of plugs then get the BR6EF's.

I know someone will want to argue this and give an example of so and so doing this and the factory runs this in a stock oem car. I'm not going to argue the point. It is what it is.

 

fbodyjunkie... ill be running a 408 iron block with a pt88 on 25lbs should i still go with the br7ef plugs...i have not got the car finished yet so getting this right before i take it to be tuned is key...thanks man