Good day ladies and gents, I need some help on choosing some plugs for my 03 GSR. As of now I am running NGK BPR8ES, one step colder than stock but would like to know other options. Engine is not heavly moded but 2 main components that may change plug choice would be cams (272)and fuel pump..

What are you guys running and what should I buy for the next round of plugs. Car is tuned very rich and flying through plugs, will get this equilized but have no AWD dyno within 8 hours of my house...

Thanks in advance!
Kirk

 

Actually, the BPR8ES is one complete heat range colder than stock. One heat range is equivalent to two steps in NGK speak. I think that plug maybe a bit too cold for your application unless you do 90% high speed highway driving.

To the contrary, on a daily driven commuter, that does significant amounts of stop and go with extended idle periods in traffic, you'll be fouling a lot of plugs and swapping sets frequently.

I'd suggest trying an NGK BR7ES instead of the BPR8ES. This plug is in fact one step colder(1/2 a heat range) than the stock BPR7ES plug.

 

My 2003 Evo 8 only has minor mods, a cold air intake, high flow CAT, nothing major.. and it started to sputter at WOT about 6 months ago on the standard NGK copper plugs.

After some research, and talking to people on this forum I put in NGK Iridium IX plugs at heat range 8. They came pre-gapped at .026, I didn't change them, just dropped them right in.

http://www.ngk.com/results_cross.asp...PR8EIX&x=0&y=0

Easily the best thing I did for my car, it has run flawlessly ever since.

 

If you have basic bolt ons with stock turbo, I would suggest NGK BPR7EIX gapped at .025". You can pick these up for about $26 and will usually last a bit longer than the copper core plugs. If you prefer the copper cores get the BPR7ES, as there is no need to go to a colder plug if you are on stock turbo.

 

Do you think I would be better off with 7's then ? Mine has the basic mods I mentioned, so I don't think it's pushing much more power than stock. I read that too hot is worse than too cold, and mine was sputtering at WOT until I put in 8's, but it could've been just bad plugs ?

 

Does that mean that the BR7EIX Iridium versions are also half a heat-range colder than stock ? And are the BR8EIX plugs half a heat-range colder than the BPR8EIX ?

 

kirk you're running the right plugs, fix the tune if it's killing them.

 

I am running the BPR7EIX's (switched them out last November), completely stock. I have had no problems with these whatsoever.

 

My car has always seemed to prefer the non-protruding tipped plugs. I ran the BR7ES untill I went to the 61mm now run the BR8ES

 

This is what i'm thinking. Thanks for the advice.

I live in winnipeg manitoba canada and to get a set of 4 of the bpr8es is about 5x the cost. My family is going to grand forks for the weekend and going to pick some up at autozone (we don't have here) and just wanting to know which plugs to buy in bulk... lol

Will try clean up the tune till the Dyno this summer.

Thanks Guys!!

edit- what is the typical AFR for this setup? I have it at 10.5-10.8:1 but i hear/read 11.3-11.5:1 is where you wanna be.

 

We have no mod list or fuel type to go on but on NE 93 my car likes the 11.5 range that 10.5-10.8 is a little too rich.

If your still on on the stock turbo and pump fuel I say stick with 7 heat range plugs man

 

In the copper plugs there are two steps within each heat range. For example, with respect to the BPR7ES the "P", stands for protruding tip. The protruding tip plug is considered to be one step hotter than the recessed tip plug.

The BR7ES, on the other hand, has a recessed tip. Thus, the "R" designation. The BR7ES is considered to be one step colder than the BPR7ES.

As far as the iridium plugs are concerned, I wouldn't know whether or not there is a recessed tip plug vs. a protruded tip plug within each heat range. I think not. However, I may be wrong. I just have never used them myself.

 

Yeah, I think so as well. You are probably running way rich.

 

i like the bpr7es myself i just wish they didn't have multiple stock numbers! all the advance auto's around here didn't have the 2023's but then i learned about 5534's and they had them.

 

yeah, i've never been a fan of the coppers. don't flame me, i'm just sayin. i've yet to run into an issue with the iridiums. even on horsepower tv this weekend, the guys were building and oldschool 405 or something like that and the only thing unamerican on the whole build was the ngk iridiums. motor made 475 horsepower. i lol'd.