Am I best getting some "cooler" NGK spark plugs given that I am running 18PSI. The car runs perfectly - always has, never misfires or hesitates (except the cold hesitation for about 1 mile on cold mornings that they all do), at 15000 miles on original plugs. What do I benefit from changing?

Anything else I should do like this? Yeah and don't say Link VF wottsit FMIC and oil cooler please. I mean simple things!

Awaiting octane booster from NAM if they are able to fulfil the order


[Edited by john banks - 2/13/2002 8:04:49 PM]

 

hotter plug will be better running higher boost etc. The hotter plug will allow better combustion.

 

John, FWIW, with the changes on my car, Mark advises to fit the NGK PFR 7 B plugs instead of the standard 6B's. I'm not sure you really "need" them with your levels of boost, but it surely won't hurt & is relatively cheap to do.

 

Morning John,

I can't answer your question, but my opinion of you has gone up even more after reading your post

It's good to see someone who's not to proud to ask and then admit that it's NOT thier area of expertise and that they would like a straight forward answer.

Nice one

Mikey

 

Some say do some don't - the usual situation Mikey!

 

Submannz?

Use hotter plugs with increased boost?

John,

I was using 7s as well - not sure you'll need them for 18psi though? although it can't harm I guess.

 

Hello John
My turn to help you!!

"Cooler" plugs are needed when you want to channel more heat out of the combustion chamber as with higher boost,higher RPM, increased compression ratios, or other such mods.

Typically the LOWER the heat range number the HOTTER the plug specfications.

For upgraded Subarus a COLDER PLUG is advisable since the car will typically be producing greater ammounts of heat in the combustion chambers due to the mods.

Platinium tipped plugs have been used in racing applications for years due to their incredible durability.

However an IRIDIUM/RHODIUM alloy is now the preferred tipped plug since it is 6 times harder , 8 times stronger and has a melting point 1200 degrees higher than platinum.
These IRIDIUM PLUGS will last for about 30000 miles and have been used to bring home two NHRA( National Hot Rod Association) championships and are used by Walker Racing in the U.S.A

Hope this helps!!

 

John
I should have added that typically one would not expect great gains in terms of horsepower from a plug change.

Possibly 1-2 H.P at best.

However with all the mods on your car, a more efficient plug that can handle the extremely harsh operating conditions inside the engine can only lead to enhance the performance of the car.

Their true benifit lies in their efficiency, durability and firing power, not in actual hp by themselves but in synergy with the other mods.

Chow

 

Some good stuff from Lizzard there

I use the colder plug as also recommended by all the tuning companies out there!

 

Thank you gentlemen!

 

Your Welcome John
Do a search on I-Club for lots more info from the U.S BBS

 

Yeah but they have some funny ideas over there - I did and I got lots of different views - Mikey would have loved it!

 

John
You are obviously on line now. Has any one thought of taking this to the next level and having this ICQ.
That way we can get info by chatting on line and still post Q & A's on line.
Anyone?

 

I started up buying a Dawes MBC
Then I discovered i needed a Boost gauge, an AFR, a meter for inlet temp. I got all that, and now I need cooler spark plugs. John whats the next item I need to buy ?

OK it's fun and the car is great, go on.

Lars

 

John

The Denso plugs are not available in the U.K
I tried everywhere.
However you can get them here:

www.olyonline.com

Olympic Imported Parts Corp.
Mail Order Division
1-800-370-0041
Product Description: DENSO IK22 (5310 is their number)
Cost: US$15.05 each.

See my previous post on ICQ

 

Not tried ICQ but there is Scoobychat!

I don't know what is next for you Lars - I think for me EBC.

I am trying to resist remapping the MAF and crank angle sensors. I would end up with a poor imitation of a Unichip written in BASIC! How embarrassing....

[Edited by john banks - 2/14/2002 2:46:33 PM]

 

Lars

"Cooler" plugs will indeed help with the overall efficiency of your modded engine and grant you the greatest possible performance from those mods!!

As with any good I.C.E. you would not put S*ITTY speakers with a high end head unit, amps, crossovers, E.Q etc.
You would be defeating the whole purpose.

Similarly, more fuel and boost, require the best spark

A poor spark = poor performance

 

Thanks John
What is the URL for the Scoobychat?

 

see the very top of the page chat.scoobynet.co.uk - it fills up in the late evening GMT.

 

Speaking of spark plugs, anybody know what the spark plug gap is for a 95WRX and torque settings ?

Giles.

 

Muncher
A GOOGLE search revealed the following

Specifications are for 4-door Turbo 4WD 2000, manual transmission, European model

Spark plugs NGK PFR6G/PFR6B
Spark plug gap 1.0 to 1.1mm

If these are indeed your plugs then this should be correct!!

 

I've just put the cooler NGK ones in my Wagon this week. No noticable difference but every little helps.
I believe that the logic of it....well it makes sense to me.

Paul.

 

Lizzard,

the HKS iridiums can be bought in the UK - they are the same as the Denso plugs - except more expensive!

I use them in my car.

Trout