plugs and HT lead upgrade

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07 December 2008 | 04:23 PM

IainMilford

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From: In the garage

plugs and HT lead upgrade

wondering which plugs are the best for my WRX running 347bhp, and also is there an HT lead upgrade worth doing

thanks
Iain

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07 December 2008 | 04:25 PM

290 AND READY

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From: Somewhere in Glasgow

ngk 7b spark plugs are what I bought and im heading for similar power to yourself

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07 December 2008 | 09:07 PM

Jolly Green Monster

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standard ht leads are best and ngk pfr7b as said are best at that level.

Simon

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08 December 2008 | 09:49 AM

IainMilford

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From: In the garage

thanks 290 and Simon

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08 December 2008 | 02:04 PM

stevie1982

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sorry to jump in but whats the best plugs if aiming for 400bhp on a p1

thanks

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08 December 2008 | 02:47 PM

joz8968

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Quote:

Originally Posted by stevie1982

sorry to jump in but whats the best plugs if aiming for 400bhp on a p1

thanks

NGK PFR7B (see JGM's post above).

...Which begs the question: at what level are the even colder PFR8's required?!

Last edited by joz8968; 08 December 2008 at 02:51 PM.

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17 December 2008 | 01:57 PM

IainMilford

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From: In the garage

thanks guys - how long do spark plugs last, or before they begin to drop in performance?

next silly question - how easy are they to change, as its a boxer engine the plugs arnt easily accessible ??

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17 December 2008 | 02:37 PM

joz8968

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Quote:

Originally Posted by IainMilford

...how long do spark plugs last...?

Taken from NorthUrsalia.com: Home...

Normal rates of gap growth are as follows:

Four Stroke Engines: 0.01-0.02 mm (0.00063-0.000126 ") per 1,000 km (621 m)

NorthUrsalia.com: Reading Spark Plugs

Last edited by joz8968; 17 December 2008 at 02:38 PM.