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The mkiv Supra Owners Club

My Spark Plugs


terribleturner

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Changed my plugs yesterday. A little P O'd coz the recipt from the last bloke who owned the car said it had IK27's in, but when i got them out they were 24's. Do you think the state of them would be the cause of my hesitation and revs bouncing at 90/100 in Top gear?? because i've put 27's in instead of 24's it's not gonna be a straight swop where i can compare results. :(

 

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Guest Terry S

I would personally go to a warmer plug than a 27 for your application James. The 24's would be fine, but depends how long they have been in there.

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Guest chiefvinso

Excuse me for jumping into a conversation, but which plug is the colder? 27 right? When you say foul up, does that mean burn out or coke up or whatever. Cheers

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Guest chiefvinso

I thought a colder plug would be good for higher boost or probably does it have relation to air intake temp which plug you should use?

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Guest Terry S

you are correct. For the really big power cars , but my poor car is running just fine on NGKBCPR7ES' which are the grade equivalent of an IK22 ;)

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I thought a colder plug would be good for higher boost or probably does it have relation to air intake temp which plug you should use?

Colder plug = wont pre-detonate/ignite due to the heat in the cylinders, therefore less chance of det.

More boost = more heat in cylinders.

Hence the more boost and power your running, the cooler the plug you should use.

 

But go too cool and you will have spark problems

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Guest chiefvinso

Hmmmm, interesting - when I get my car it will be serviced and pressumably the plugs will be manufacturers recommendations. Will these be ok for the time being or should I get some iridium plugs to be safe?

 

The car is almost standard, it has an HKS drager zorst and some hks air intakes but the rest is standard - except for boost gauge. Cheers

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Your probably running close to standard boost, so standard plugs will be fine. Nothing wrong with going a grade cooler though if you plan to uprate anything else at some point. I *think* iridium plugs offer no performance upgrade other than lasting longer

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Guest chiefvinso

And leave the leads standard? One of the first mods recommended to me by a jap car tuning business for my mr2 turbo was some iridium plugs and magnecor leads just to start me off.

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Guest chiefvinso

Terry its a TT, should have said that in the beginning. Taking over terribleturner's thread - sorry!

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Guest Terry S
Terry roughly what sort of price are they?? Gonna get some 24's from the US for about £40/45.

 

What the NGK's, about £1.50 a plug

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