Howdy all,

I just made a change to one step colder range plugs after 35K miles n my daily driver MINI (see mods below).. I just was not sure about doing this.. But after reading many post on those that have changed out the stock plugs - due to pulley, CAI upgrades - and the comments on improvements, I wanted to try it for myself. I went with the popular NGK plugs in the level 7 temp range (stock is 6)... For reference this is the temp range plug used in the JCW kits..

Wow.. I can feel the engine running smoother and with my ScanGuageII I can see the IGN (timing) advance is now greater than the level 6 plugs..

Which gets me thinking.. Would I see more timing advance (which I think is more power ??) with a even colder range plug?? I searched here for "NGK BKR8 " but I don't see many that posted about this temp range plug... So if there are tuners/mod-ers out there that have experience with level 8 plugs from NGK.. I would like to hear from you..


Many thanks

 

Bump.. Bump... No one???

Hard to belive that I am in uncharted area here...

 

I have plugs, msd box, and plug wires in the mail. I have read about the same results as you. You would think that with the plugs igniting the extra fuel it would optimize the power..

 

Felix_434.. I am not sure it is about igniting the "extra" fuel with colder range plugs... I think it is more about heat managment and keeping the timing advance - which might provide more power..

But this is where I was hoping to get other's insights..

what do you (or others) think???

 

If you picked up more timing advance with the colder plugs, it was because your old plugs had "hot spots" that were causing pre-ignition in the fuel/air mixture.

It sounds like your one-step-colder plugs are preventing the pre-ignition, so there's nothing more to be gained by going even colder.

Pull the new plugs once they've been in the car a few thousand miles. If the porcelain insulator surrounding the electrode is a nice light tan/brown colour, you've found the correct heat range for your engine.