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 Post subject: Spark Plug Choice
Posted: Sat Sep 12, 2009 5:50 pm 
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hey im new to the petrol turbo gig and i am just curious to what spark plugs people are running

what they found to be good and what they found to be absolute crap
and what would be a decent set of plugs to get for mid range 9psi setup


Tezza

 

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 Post subject: Re: Spark Plug Choice
Posted: Sat Sep 12, 2009 6:36 pm 
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im running the ngk iridiums gapped at .9mm..
im running 10psi and so far no problems...
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 Post subject: Re: Spark Plug Choice
Posted: Sat Sep 12, 2009 10:50 pm 
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The LPG plug seems fine but run plug gap alittle tighter..
.70 mm gap...
More boost ?? I would tend to use the shorter electrode plug where cooling is better..
Atleast one range colder.. In the NGK range the higher the plug # the colder the plug..
I also find Iridium / Platnum plugs tend to glow and induce detonation ...
As it
says on NGK site.. For every 100 h.p lower heat range 1 heat range...

 

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 Post subject: Re: Spark Plug Choice
Posted: Sat Sep 12, 2009 11:25 pm 
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EBXR8380 wrote:
The LPG plug seems fine but run plug gap alittle tighter..
.70 mm gap...
More boost ?? I would tend to use the shorter electrode plug where cooling is better..
Atleast one range colder.. In the NGK range the higher the plug # the colder the plug..
I also find Iridium / Platnum plugs tend to glow and induce detonation ...
As it
says on NGK site.. For every 100 h.p lower heat range 1 heat range...


while were on this subject? A slight hyjack. :)....
now im thinking maybe the iridium path might not be the best plugs for boost?
i had these in the engine n/a then just re gapped them when i went with boost.
you said iridiums tend to glow causing detonation??
while mine seems to run fine except some occasional detonation,
mine are the ngk zrb6 iridiums gapped to .09, so the std zrb6 or 7 could give me better results as in less likely to cause detonation compared to the same iridiums??..
do you think a too cold of plug can have any negative effects other then the possability of fouling up??
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 Post subject: Re: Spark Plug Choice
Posted: Sat Sep 12, 2009 11:42 pm 
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Troyman, I'm running standard NGK's one range colder (7's I think) and gapped at 0.76mm. These seem to be working fine at the moment.

Definately a cheap and quick area to experiment with to try and remove some of that det.

 

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 Post subject: Re: Spark Plug Choice
Posted: Sun Sep 13, 2009 12:17 pm 
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Don't be gapping irridiums lads.

 

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 Post subject: Re: Spark Plug Choice
Posted: Sun Sep 13, 2009 12:25 pm 
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JoeXR6 wrote:
Troyman, I'm running standard NGK's one range colder (7's I think) and gapped at 0.76mm. These seem to be working fine at the moment.

Definately a cheap and quick area to experiment with to try and remove some of that det.

In the V8 thats what I use..Well ?? # 7 heat range with alittle ground off the earth electrode...
Too much causes detonation and there is no point in earth going past the electrode...
Indexing plugs to face exhaust helps against blow out also...

 

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 Post subject: Re: Spark Plug Choice
Posted: Sun Sep 13, 2009 12:38 pm 
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JoeXR6 wrote:
Troyman, I'm running standard NGK's one range colder (7's I think) and gapped at 0.76mm. These seem to be working fine at the moment.

Definately a cheap and quick area to experiment with to try and remove some of that det.

In the V8 thats what I use..Well ?? # 7 heat range with alittle ground off the earth electrode...
Too much causes detonation and there is no point in earth going past the electrode...
Indexing plugs to face exhaust helps against blow out also...

 

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As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

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 Post subject: Re: Spark Plug Choice
Posted: Wed Sep 23, 2009 6:25 pm 
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I run iridiums gapped to .9 ml on 9 psi and has no problems
The only reason they say not to gap iridium plugs is because they have a small electrode and most people would butcher it but I've done it plenty of times just be very careful. If the feeler gauge won't go in don't force it and when re gaping just take it easy.

Peace of piss

 

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 Post subject: Re: Spark Plug Choice
Posted: Wed Sep 23, 2009 6:26 pm 
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I run iridiums gapped to .9 ml on 9 psi and has no problems
The only reason they say not to gap iridium plugs is because they have a small electrode and most people would butcher it but I've done it plenty of times just be very careful. If the feeler gauge won't go in don't force it and when re gaping just take it easy.

Peace of piss.

Although 19 bucks for a plug is pretty high considering itd be fine with standard ngks gapped to .8 or so

 

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there are a few falcons in my drive way, some of them are turbo charged and some arent, some have big engines and some are small but they all have one thing in common and that is the blue oval on the front

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 Post subject: Re: Spark Plug Choice
Posted: Wed Sep 23, 2009 8:01 pm 
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Im using BPR7ES gapped at .88 mm and they are going good on 10psi, they are a nice colour and there is no detination. Indexed also.

I was getting spark break down on any hotter heat range.

 

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 Post subject: Re: Spark Plug Choice
Posted: Thu Sep 24, 2009 12:54 pm 
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When the manufacturers say not to gap irridium plugs it's good enough for me.
Irridium is brittle is why they should not be regapped.
It could end up going through your engine,and that'd be a real smart move hey.
Gap or don't gap it's up to you.

 

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 Post subject: Re: Spark Plug Choice
Posted: Thu Sep 24, 2009 1:42 pm 
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Im using XR6 turbo Denso plugs in my car at the moment. Im only running 7psi at the blower and so far have been good.

I plan on doing a major service this weekend. But in the next week or 2 I will be adding more boost via a smaller pulley, very similar to what TROYMAN has done. Should I go for a colder plug NOW, or wait till the pulley is on and worry about it then?

What NGK model number will be ok for say 11-12psi boost?

 

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 Post subject: Re: Spark Plug Choice
Posted: Wed Sep 30, 2009 6:57 pm 
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My car was suffering from blow out since i got it.Put some max 300 leads on and half fix the problem but it was bad today so when bought some BPR7E as it only had the standard long plugs in it.Took for for a run and it the best it run so far and i gapped them at .8mm too....

phill
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 Post subject: Re: Spark Plug Choice
Posted: Thu Oct 01, 2009 12:33 pm 
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taxi 5L wrote:
My car was suffering from blow out since i got it.Put some max 300 leads on and half fix the problem but it was bad today so when bought some BPR7E as it only had the standard long plugs in it.Took for for a run and it the best it run so far and i gapped them at .8mm too....

phill


Are they the XR6 type plugs?

I think I bought the ZGR model number last week and am gonna give those a go.

 

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