JP4mance Tuning Parts

iTrader: (9)

NGK Iridium IX spark plugs from £32.35 inc vat & FREE uk delivery.

We carry various plugs in 3 heat ranges as follows:

Heat grade 6 (stock)
Heat grade 7 (1 stage cooler for tuned engines)
Heat grade 8 (2 stages cooler for highly tuned engines)

I run these in my own TSL333 '53 STI and rate them over the stock plugs personally. I get great economy and a much smoother idle.

Subaru Impreza 2.0 Turbo (1992-00) - NGK Iridium IX spark plugs (HEAT 7)

Subaru Impreza 2.0 Turbo (1992-00) - NGK Iridium IX spark plugs (HEAT 8)


Subaru Impreza 2.0 Turbo (2001-06) - NGK Iridium IX spark plugs (HEAT 7)

Subaru Impreza 2.0 Turbo (2001-2006) - NGK Iridium IX spark plugs (HEAT 8)


Subaru Impreza 2.5 Turbo (2007) - NGK Iridium IX Spark Plugs (HEAT 7)

Subaru Impreza 2.5 Turbo (2007) - NGK Laser Iridium Spark Plugs (HEAT 6)

Subaru Impreza 2.5 Turbo (2008+) - NGK Iridium IX Spark Plugs (HEAT 7)

Subaru Impreza 2.5 Turbo (2008+) - NGK Laser Iridium Spark Plugs (HEAT 6)

johnpye

iTrader: (3)

Which of these would I need for an 04 sti running 350bhp?
Heat 7?

bigbruiseral

iTrader: (1)

from your website??

"These are the OEM spark plugs as supplied and fitted to the car from Subaru."?

JP4mance Tuning Parts

iTrader: (9)

Heat 7 is a safe bet for a 350bhp engine. This is 1 grade cooler than stock.

JP4mance Tuning Parts

iTrader: (9)

NGK 'Laser' are the OEM Subaru spark plugs, platinum on most engines.
NGK iridium IX are the performance upgrades.
I now run the IX plugs on my car and rate them personally.

bigbruiseral

iTrader: (1)

Ah thank you looked the same to me

peter zippy reid

iTrader: (25)

What ones for a 55sti running about 375-385 cheers

JP4mance Tuning Parts

iTrader: (9)

I'd say a heat grade 7, which is one grade cooler than the standard heat 6 plugs used on a standard EJ207 engine.

peter zippy reid

iTrader: (25)

cheers just bought them with my sons paypal

JP4mance Tuning Parts

iTrader: (9)

These will leave us tomorrow.

peter zippy reid

iTrader: (25)

thanks will leave pos feedback when they arrive

Dark

iTrader: (1)

Hi, which plugs to replace a set of NGK PFR7Bs on a 2002 STI with ~350bhp?

http://www.jp4mance.co.uk/products/1/Subaru/_/427/

Thanks, Mark

JP4mance Tuning Parts

iTrader: (9)

Sorry for the delay in reply, Mark but i only just got the notification

Yes, those NGK iridium IX plugs in the link replace PFR7B's (NGK Platinum, heat 7)

Ian

iTrader: (10)

hi what heat grade would you recomend for a 450 bhp 2.1 please.

i am running the 7s at the mo, worth changing to the 8s?

vc_1985

iTrader: (10)

ill take a set of grade 7 for my bug

Razorwrx1

iTrader: (21)

These look good, I'll order some soon.

JP4mance Tuning Parts

iTrader: (9)

Probably heat 8, but check the condition of your plugs when you take them out for a better indication of how your engine is running.

Light brown / Grey
This is a good indication that your engine is fueling well so stick to heat grade 7 if that is what you're running

White deposits / blistered surface
This could be an indication that your spark plugs are too warm, so go for a grade 8 (one stage cooler). Other things to rule out in this case would be:

• Over advanced ignition timing
• Too lean fuel mixture
• Blocked injectors
• Insufficient cooling
• Excessive deposits in combustion chamber
• Spark plug too warm

Excess black carbon deposits
This is an indication that the plugs you run are too cold. Unlikely in this case to be honest, but if you switch to heat 8 and this happens, then you know what to look out for. Other causes of carbon build up:

• Too rich fuel mixture
• Excessive use of choke
• Prolonged low speed driving or idle
• Blocked air filter
• Spark plug too cold

Hope this helps.

Wilky0302

iTrader: (4)

Hi what plugs would you suggest for a 350bhp 2.5 wrx hawkeye?

And are the prices for a set of 4 or single plugs?

thanks

JP4mance Tuning Parts

iTrader: (9)

I'd try heat 7 and see how you get on, but see previous post.

Prices are inclusive of vat and delivery to UK postcodes. The price is for a set of 4 plugs. As much as i'd love to sell you a set of NGK plugs for £129, i don't think i'd stay in business for very long

Wilky0302

iTrader: (4)

Hi thanks for your help

do i order them from you directly ie paypal or from your website?

JP4mance Tuning Parts

iTrader: (9)

We accept card payments and PayPal via the website check out

StevoT2000

Hi,

Could you tell me which plugs would be suitable for my standard 2004 WRX please?

Thanks
Ste

JP4mance Tuning Parts

iTrader: (9)

Heat 6 is the stock plug grade, but most opt for the cooler heat 7. Both are in stock, same price.

StevoT2000

Cheers, I've jus ordered some through your eBay shop