Leeroy_25

Hi Guy's can you suggest a plug gap to run on these please.
I am running a single turbo conversion at 12psi with no amp at the mo and trying these to cure some very mild breakup until I can afford to get the twin power and racing plugs!

How often should I be looking to change these plugs as I heard the tips can come off in your motor when they run too hot? Don't know if anyone here has had that problem and if so whether it's a danger to the engine or does it just spit them straight out?

Thank you
Lee

StavFC

These ARE racing plugs. Just because a tuner doesnt rape you for £200 for them doesnt make them not racing plugs.

And I cant see the tips coming off, thats the whole point of colder plugs, they DONT get too hot and either melt the tips off or promote det, unlike running 9s/8s/7s depending on your car. Whered you hear that? Interesting to know the reasoning behind that one, and if not BS is gives more to worry about...

I dont think it will help missfires much, well, not the plug itself, the small plug gap might help it miss less though.

I run .020" on mine, most seem to on here, thats about what they seem to be out the box anyhow.

Twin Power and changing from post to pre compressor WI is what removed any missfire from mine, running 10 heat range plugs is just a common sense measure to help prevent det etc, didnt seem to affect the miss.

Leeroy_25

Thanks for the info on gap size..
I realise these are Race plugs and I chose them as they come recommended at a fraction of the cost of te plugs most tuners recommend!
As for heat breaking down the plugs I am guessing it is the combustion temp in the rotary that over heats the plug and causes the breakdown and eventual damage. But I am not sure. I read a post on here that mentioned it earlier.. did not mention the tips dropping off mind!

bc_fd3s

iTrader: (2)

In all honesty, those plugs are overkill for what you need. Only 12PSI? 9's all around with a twin fire will be more than enough for your needs. I paid like $30 for 4 9's off ebay.

arghx

iTrader: (3)

I'm running over 16psi on stock plugs (four BUR9EQ) with a T04R. I used to use the BR10EIX but they couldn't hold up to the heat like the stock plugs can.

If you think about it, running four trailing plugs is still two steps colder than stock in the leading position.

Leeroy_25

I have gone for the 10's as I plan to get the twin power and then run maybe 15psi boost. I presume I will be fine to use the 10's until this happens or should I maybe only run two of them? I am not sure how running different lead and trail plugs effects things? I am not too familar with how they operate to be perfectly honest to understand what benefits it has?
So arghx you are finding the stock Bru9's hold up fine with the twin power and no need for race plugs? Interesting.
I partly opted for the B10EGV's as I read a few people on here used them who weren't running ignition amps yet but said it improved general running and they lasted longer?

JDK

iTrader: (8)

I use B9EGV's for leading & B10EGV's for trailing along with a HKS Twin Power and 10mm Magnecor wires... gapped at 0.25 work's best for me. I've also had good results with four BUR9EQ's but found them very costly, you could also use four B9EGV's. I didn't like the BR10EIX's at all, like arghx said they didn't like the heat.....I run a GT35R @ 20psi

Leeroy_25

Thanks for the info. So you think 4 10s is over the top? would it give me running problems of any sort or major power loss? I had a look today and actually found I am running a standard setup of BUR9EQ trailing and BUR7EQ leading. Plugs looked nice and clean and my socket was not slim enough to fit the B10EGV's so I put back in the 9's with another pair of 9's for the leading.
Could I run the standard 9's leading and my B10EGV's for the trailing if we think the 10's all over is too much for my needs?

Cheers
Lee

bc_fd3s

iTrader: (2)

It's too much for your needs at all. Stick with the 9's. If you're only running 15PSI max there is no reason to run 10's, even in the trailing position.

arghx

iTrader: (3)

When I switched to 10s I noticed a worse idle and additional fuel consumption, at least on my car. That's one of the reasons why I went back to OEM plugs. Remember that running a 9 heat range in the leading is still two steps colder than stock.

One of the reasons why the FC ignition system is stronger than FD's is because the old ring-style series 4 plugs (SD part #) had a huge gap which requires a strong ignition system:



The EQ series is an actual rotary-specific design intended to increase longevity and driveability. The 7EQ/9EQ was introduced in series 5, originally with a gap of 1.4mm/.056" . The platinum version in the series 6 FD reduced the gap further, as platinum plugs don't need as big of a gap for a good spark:



The BUR9EQ's have four outer electrodes and a much greater gap (1.7mm or .043") than the cold plugs people are running, some of which are irridium and some of which are not. A larger gap helps burn the fuel more completely, but it does require a stronger ignition system. Also note that HKS twin power is supposed to be used with resistor-type plugs (B10EGV is non resistor). A lot of people do run the Twin Power with non resistor plugs anyway, but it is an expensive box...

Leeroy_25

Maybe i'll be getting some 9's then! Dam it! Saves the bother of having to make a special plug tool!
What are you saying about the FC system Arhgx? Did I miss that somewhere? Are you saying to swap my FD ingnition system for an FC one?

I had also heard about the twin power and resistor plugs.. The 10's were litterally and inbetween thing to try and rid the little breakup I have until I get the twin power. So by the sounds of it no need for expensive race plus.. Just the standard 9's all around with the twin power?

Cheers
Lee

arghx

iTrader: (3)

The FC leading coil is a common upgrade for the FD. I wouldn't swap it in unless you are getting misfire with the Twin Power though.

I think there are times when 10 heat range plugs are needed, but a lot of people switch to them unnecessarily. Again I am running over 16psi on a T04R/T67 turbo with four BUR9EQ's. I went through that whole mess you are doing now. I didn't want to throw down on the Twin Power so I tried different gaps with the Irridium BR10EIX plugs. Just spend the money on the Twin Power and be done with it, it's one of the only thing HK$ sells that's actually worth the money.

BigTurbo74

iTrader: (4)

Good info ARGHX.