NGK Iridium IX spark plugs available for:

2.0 Impreza Turbo Versions 1-6 (All models) - Clicky

2.0 Impreza Turbo STi & WRX Versions 7-8 (All models) - Clicky

2.5 STi Impreza Turbo Version 9-10 (Hawkeye/Hatch) - Clicky

 

2.5 hawks the same as the hatches i take it?

 

What heat range would you recommend for a version 4 type-r at 350 bhp and do they come gapped correctly, many thanks

 

What would you recommend for a 280bhp 350lbs/ft torque hawk 2.5 WRX?
Thanks

 

As a very general rule of thumb, go 1 stage cooler than stock for every 50-100bhp increase. It requires some research though, no 2 engines are the same and many factors will determine performance and wear of the plug.

The plugs are pre-gapped. Iridium IX plugs shouldn't really be re-gapped.

Hmm... can anyone tell me the stock part number of the 2008+ Hatch spark plugs? I'll see if they cross over to an IX plug from that...

 

The plug listed for the 08 STI hatch is NGK SILFR6A.

Paul.

 

Thanks, Paul!

This part number does cross over to the Iridium IX plugs which we stock in heat grade 7 (1 grade cooler). specs: 14mm, 26.5mm reach, 5/8 hex

I'll update the thread above & website now.

 

Now stocking NGK OEM replacement spark plugs and Iridium IX upgrades for the 2008+ Impreza's WRX & STi (GRB)

NGK Laser iridium (heat 6) - OEM

NGK Iridium IX (heat 7) - Upgrade

 

Hawkeye OEM plugs due in stock Monday - ILFR6B

 

NGK Laser OEM spark plugs for the Impreza 2006-07 (Hawkeye) are now listed and available:

http://www.jp4mance.co.uk/products/1/Subaru/_/2741/

As are the Iiridium IX upgrades in heat grate 7:

http://www.jp4mance.co.uk/products/1/?related=585

 

 

All orders to date have been despatched - thanks.

Plenty available in stock still to go

 

Hi there, any idea what plugs will suit my car - modded classic c450hp? Running racing 8s at the mo which I'm not too happy with (expensive & don't seem to run that good )

TX.

 

Try these NGK iridium IX in heat 8:

http://www.jp4mance.co.uk/products/1/Subaru/_/2725/

I run 7's in my '53 STi (TSL333 tuned) and i can't fault them. Very smooth idle too.

 

We're running low on the hawkeye plugs (Iridium IX) but more are due in stock Monday. Currently 5 sets available.

 

All orders placed by 4pm today have been despatched - have a good Easter guys!

 

 

550hp hawkeye best plugs ?

 

Probably a cooler plug, heat range 8 possibly even a 9.

Are you in the process of building the engine or have you been running the car at 550bhp? If so, the current condition of the plugs will give you a clue.

Too hot means not enough heat transfer to the cylinder head
Too cold means the plug won't burn off carbon deposits efficiently

More info: http://www.jp4mance.co.uk/gallery/4/35

 

 

Fresh stock just in - all part numbers are available

 

BTT

 

Hi, it says out of stock for the NGK PFR7B:
http://www.jp4mance.co.uk/products/1/?related=1155

Are they available? How do I buy?

 

As it says we're currently out of stock on that part number and it'll be early next week before the next shippment arrives. The iridium upgrades are a good alternative though, plenty of those in stock. Cheaper too

 

I too am running NGK7s but am due a service so would the Iridiums be like downgrading for me?? Or are they of equal characteristics???...

classic STi6, rebuilt forged engine, 20g turbo, 550cc injectors, Tek 3 remap etc etc (est 350-370bhp)

cheers

 

NGK Iridium IX are considered an upgrade over most OEM spark plugs. I use them in my STi V8 and favour them to the platinum.

 

Plenty still in stock

 

BTT

 

Hi,

Please could you confirm if the 2006 wrx 2.5L Hawkeye plugs are ILFR7H part number?

This is the part number I have been told to use for the uprated heat 7 plug for my 340bhp wrx.

p.s. The link at the top of this post no longer works.

Ta.

 

Hi,

I think we just replied to your email enquiry?

ILFR7H = NGK LASER IRIDIUM (OEM brand)
LFR7AIX = NGK IRIDIUM IX (Upgrades)

Link is now fixed, thanks