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Spark plugs for ESS supercharged cars?

14K views 47 replies 17 participants last post by  Silent 
#1 ·
What plugs are you guys running in your ESS supercharged cars? Is there a better choice than the factory recommended one?

Thanks
 
#4 ·
Is this OE replacement?


If you're tra king it or have the potential for running lower octane fuels you can run one range colder plugs...
I run 93 octane only.

I was planning on running a couple HPDE's a year, but I have concerns the supercharged cars will experience too much heat soak due to the extended high RPM running on the track. Most likely my car will relegated to street use only.


Anyone here run their ESS car at track events?
 
#6 ·
I run one range colder. It is a stock plug for late model 911's. I believe the engine designation is "H6". Also used in some JCW Mini's.
Regards,
Jerry
 
#10 ·
#12 ·
Any reason why you prefer iridium plugs to copper ones, other than longer change intervals?
 
#17 ·
Plenty of factory FI cars use iridium plugs and they do last a lot longer.
 
#19 ·
Sparkplugs - FI E39 M5s

My S3 is a daily driver. I'm currently running the Denso Iridium spark plugs 1 heat range colder than stock. I also have the plasma coils. Previously I ran the stock NGK plugs without any problems.
 
#21 ·
OEM replacement specs on most iridiums is at least 60k miles, with old-school coppers, 15k is the max I would go.
 
#22 · (Edited)
I am going to install one heat range cooler plugs in my car as part of my 60K maintenance plan. Interesting the multi-ground OE plug is a little more expensive than the premium Iridium version.

NGK.com - Application Search Results

For one heat range cooler, I assume the BKR7EIX versus the BKR6EIX recommended on the NGK site for a stock car are the right ones.

Anyone use these?
 
#34 ·
I’m supercharging my M5 soon (it’s stock currently) and my m5 also needs spark plugs so I’ll be replacing those at the same time. I was planning on just getting the oem ones but after reading this thread I’m wondering if I should get different ones. I’m not installing a meth system or any other mods besides the supercharger
 
#39 ·
On the theory that a supercharged car will generate more heat when it is being used as intended, I went 1 range colder (NGK "7" instead of "6"). No issues to date, although on the track I would consider even 1 more range colder after reading #7 plugs.

The stock plug in a #7 configuration was stock on 1st gen Mini GP, so easy enough to find.

Regards,
Jerry
 
#45 ·
How much are you guys increasing your gap for your pressure? For my RS4 that got turbos I had to go to a totally different plug with a much longer gap and single single electrode setup. It is what was recommended. They did math so I assumed it was just science. From what I gathered the more dense the mixture was the longer gap you needed. Maybe I should have done some research?
 
#46 · (Edited)
Generally the more boost you run, the tighter you want your gap. It's just to prevent blow out.

For every 100hp increase from stock; go 1 range colder. So I build cars for 600bhp+ and go 2 ranges colder into the "8" series single electrode spark plugs.

.025" / 0.635mm gap


You can change the plugs just fine if you have a good assortment of extensions and swivel sockets that you can fish through the brake lines on the back of the ABS unit.
 
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