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plugs and HT lead upgrade

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Old Dec 7, 2008 | 03:23 PM
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Default 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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Old Dec 7, 2008 | 03:25 PM
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ngk 7b spark plugs are what I bought and im heading for similar power to yourself
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Old Dec 7, 2008 | 08:07 PM
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standard ht leads are best and ngk pfr7b as said are best at that level.

Simon
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Old Dec 8, 2008 | 08:49 AM
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thanks 290 and Simon
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Old Dec 8, 2008 | 01:04 PM
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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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Old Dec 8, 2008 | 01:47 PM
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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; Dec 8, 2008 at 01:51 PM.
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Old Dec 17, 2008 | 12:57 PM
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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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Old Dec 17, 2008 | 01:37 PM
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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; Dec 17, 2008 at 01:38 PM.
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Old Dec 17, 2008 | 01:39 PM
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thanks pal

now I just need to get them out, 17mm socket isn;t it??
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