I've been noticing some hesitation during driving shortly after startup and I've been reading that colder spark plug should help with this problem.

I'm trying to find NGK Iridium plugs that are 1 step colder than stock. From everything I've read on the forums, the stock plugs for Cooper S are NGK PLZBR7A-G. Finding '1 step colder than NGK PLZBR7A-G' isn't exactly an easy task.

Anyone have the part number for the NGK plugs that fit the R56 and are a step colder (8 by NGK ratings) than the stock plugs?

 

I was just sent NGK-ILZKBR7A-8GCS-B by Craven Speed, could that be what you are looking for?

 

JCW or regular Cooper S? Those are the recommended plugs for an R56 JCW according to the basic guide to spark plugs by czar. It also says that the only difference between the Cooper S plugs and the JCW plugs is platinum vs iridium.

 

Actually, it says the JCW plugs are "ILZKBR7A-8G". I wonder if there's any difference between "ILZKBR7A-8G" and what you bought, "ILZKBR7A-8GCS-B".

 

Many use NGK 4471. Way sells it as 1 step colder for stock. And a good upgrade for modified engines. But they are platinum not iridium.

 

Hmmm. I really would rather do iridium. I've not seen many good things about platinum plugs. This really shouldn't be this difficult to find these plugs.

 

i've been using the ILZKBR7A-8G since i've had the JB+ and have had no issues. terry from BMS recommended these. they're supposedly 1 step cooler. for what it's worth, terry uses these on the BMS shop car as well.

 

Another alternative is the Denso IXUH22. It's one step colder and the center electrode is .4mm instead of the .6mm of the NGK. So less voltage is needed for spark and it cools quicker. The lower electrode also has a U-groove in it to protect the flame kernal in high boost situations. I've had great luck with them so far.

http://www.globaldenso.com/en/produc...2010/07_4.html

 

Excellent, thanks. This is exactly what I was looking for. How do you like your hybrid turbo, btw? Worth the upgrade?

 

Thanks, I'll look at these and the Densos then. Both iridium and 1 step cooler than stock.

 

The NGK (5992) ILZKBR7A-8G will work just fine in a cooper S. I just put them in my car, no issues yet.

 

If you would really like to step it up with a race plug the Brisk QR12LS. Still a step colder, but these are used by Chris Sneed of sneed4speed for his MINI builds. ra2fanatic used these in his most recent build.

 

I just installed the Brisk plugs that Sneed's carries about 3 or 4 weeks ago.

 

How is everything running?

So far, the options are:

NGK ILZKBR7A-8G (7 on NGK scale)
- 1 heat range cooler than MCS
- same heat range as JCW
Denso IXUH22 (27 on Denso scale)
- 2 heat ranges cooler than MCS
- 1 heat range cooler than JCW
Brisk QR12LS (8 on Brisk scale)
- 3 heat ranges cooler than MCS
- 2 heat ranges cooler than JCW

 

So far no problems. Did a decently spirited club run a week ago and all was fine.

 

Loving it so far. I'd say it is definitely worth it. You can make the standard turbo reach 1.5 bar of pressure but it will taper quickly at higher engine RPM's. Also, if you look at the compressor map on the 38mm turbo it's seriously pushing the turbo shaft RPM to the tune of about 180,000 RPM and your way on the outside of the turbo's efficiency zones. Our turbo's have bushing style bearings instead of ball bearings so they will wear out that much quicker when pushed to the outer edge of their design limits.

 

I've had great results with the 5992 plugs too. Just gap them a little bit tighter if tuned.

PS. We have the plugs and special socket in stock if you need either.

http://www.burgertuning.com/mini_coo...t_adapter.html

 

Did those come pre gapped? Or did you have to gap them?

 

What would you gap to if tuned? I just went out to my car to see what plugs I currently have, and they're actually already the ILZKBR7A-8G. I swear when I replaced them a couple years ago that I got the stock plugs from the dealership, but they must have given me the JCW plugs. I'm going to try to regap them tonight to see if it helps the stuttering a little bit.

 

I run .022 on ours. Same as our N54s. And they've been working well @ 18psi.

 

Terry, just to confirm, these can be used on the R60?

 

These came pre-gapped.

I had tried the Brisk a few years ago when I had to gap them myself and could never get them right.

 

Meaning you bought them straight from Brisk and tried to gap them without success? Then bought them directly from Sneed and they were pre-gapped?

 

Ok, so I gapped 'ILZKBR7A-8G's to .022 and the car ran much smoother, but I still think I'm going to go with either the Denso's or Brisk's because I still had a minor bit of stuttering as the car was warming up. My plugs looked clean, if anything a little too clean. Makes me thing I do indeed need a cooler plug.

 

I'm running them on our MINI S N18 motor. The motor dictates the plugs not the platform. But your mileage may vary.