I just purchased a Kingsborne 9mm wireset and Pilo's Screamin Demon Coil and wonder if I can still use the stock plugs. Any problems with this set up or should I buy some Beru plugs?

Thanks,
Carl

 

yes

 

Thanks,
Does that mean good with stock plugs?

Carl

 

yes the stock plugs are very good plugs i have used others and have gone back your good

 

I think it's more importaint to note thet you are running a 15% pulley. With this mod alone you should be using a colder plug anyway. Wires and coil make very little difference if any, but you pulley is. You should be going one colder then stock.

 

onasled is right. You need to be running a cooler plug like the Denso IK-22's. Otherwise you run the risk of prematurely burning out your plugs since they are not designed to handle the higher temps.

 

What are you basing this on? I have run the stock ignition system including plugs, coil, wires, etc for the past 25K of pulleyed driving. This includes autox, drag racing, HPDE. I've never logged nor felt misfires, and the plugs are still in beautiful condition today.

 

I've heard this from a vendor before two.

 

Let me guess ... vendors who sell spark plugs?

 

I don't think they are necessarily needed. The problem comes from the fact that since you are running a higher boost with the smaller pulley higher combustion temperatures are being created. If a temperature becomes high enough, detonation occurs. If the engine detects detonation, it will back off the timing, and you will loose some power. Does this mean the stock plugs will cause a problem? Who knows. No one has really done a lot of testing. Obviously being in really warm climates with higher outside temperatures, definitely contributes to the problem. JCW does include it in their kits, and so do many other people who put tuning kits together. Whether it is really needed could be a big argument. The relatively minor cost of the plugs, indicates it wouldn't hurt to have colder plugs, and it may even help some.

 

The saying I've always heard is 'Never ask the barber if you need a haircut.'

It's the same with vendors.

 

A note of caution, just because you don't hear or feel detonation does not mean that it is not occuring. There's bunches of examples on other s/c'd engines where there was no obvious sign of detonation right before the engine block ventilated.

On the other hand, I haven't read a post yet of anyone blowing their MINI engine because of an uprated pulley. My not-too-educated opinion would be to play things safe and go one step cooler on plugs when adding boost. That is standard m.o. on other s/c'd engines, makes sense to follow it on our engines too.

 

If you want to do the colder plugs go for it. Is it nesessary? No
I have done it both ways and had the car on the dyno both ways and no difference in any way. My car is highly moded.
Also a couple of people have had the denso's break on them so make sure to make an informed desision. Anyway have fun with your car and let us know what you decide to do.

 

One of the reasons why manufacturers don't run "colder" plugs is because colder plugs generally have shorter life spans than hotter plugs. So, if you want to replace your perfectly fine stock plugs (or other ignition components) with much more expensive aftermarket replacements as some sort of "safeguard", go for it. But, expect to replace the colder plugs more often. If you want to replace the other ignition components to make pretty colors in your engine bay, go for it. But paint would be cheaper.

 

Is it beneficial to go for colder plugs on any car?

For instance, if one had merely an intake and exhaust installed, would they benefit from colder plugs?

I guess what I'm asking is, when will you see the benefit?

 

You definitely DON'T NEED to run a cooler plug. Most people with pulleys are running stock plugs and I have yet to hear of a problem. The only one telling people to change plugs are vendors...That is vendors that sell spark plugs...