spark plugs upgrade
18 November 2004, 06:35 PM
#5
Scooby Regular
Join Date: Dec 2003
Posts: 308
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by morpheous
you tell me ??
do you have one ??
check your plugs LOL
do you have one ??
check your plugs LOL
18 November 2004, 07:29 PM
#6
Scooby Regular
Join Date: Nov 2000
Location: 32 cylinders and many cats
Posts: 18,658
Likes: 0
Received 1 Like
on
1 Post
Can't get NGK PFR8B to my knowledge. NGK BKR8EIX are one option (cheap) or NGK Racing 7434-8. I would suggest an 8 for over 350 BHP, a 7 for 250 to 350.
19 November 2004, 10:53 AM
#7
Scooby Regular
Join Date: Oct 2001
Posts: 1,833
Likes: 0
Received 0 Likes
on
0 Posts
STI gives as uprated spark plugs the Iridiums BKR7EIX for WRX and STI both with 0,6mm gap, I don't know about heavy modded engines but they work great in a friend's STI with 1,45bar boost and more than 350ps!
JIM
JIM
Trending Topics
19 November 2004, 02:12 PM
#8
Thanks John for just correcting me on that plug number i must have had a dizzy moment 
Just a thought on heat ranges basically,would'nt have said an upgrade more like a precaution for your tuned engine.
Just a thought on heat ranges basically,would'nt have said an upgrade more like a precaution for your tuned engine.
Originally Posted by JIM THEO
STI gives as uprated spark plugs the Iridiums BKR7EIX for WRX and STI both with 0,6mm gap, I don't know about heavy modded engines but they work great in a friend's STI with 1,45bar boost and more than 350ps!
http://www.subaru-sti.co.jp/parts/gd.../image/3-2.jpg
JIM
http://www.subaru-sti.co.jp/parts/gd.../image/3-2.jpg
JIM
20 November 2004, 12:38 AM
#9
NGK PFR7B are a good reliable plug for reasonable cost and operated well for me. Unfortunately around 500 bhp I was persuaded to try an "upgrade" to HKS 35i. Broke the electrode insulator on one and heard of others that broke around the same time.
20 November 2004, 09:50 AM
#10
Scooby Regular
Join Date: Jan 2003
Location: I wish we had a non-profit making website to put here.
Posts: 1,185
Likes: 0
Received 0 Likes
on
0 Posts
Aren't the HKS plugs rebadged Denso plugs anyway?
With regards to the original question whats the point in putting a colder plug into a standard engine?
With regards to the original question whats the point in putting a colder plug into a standard engine?
20 November 2004, 10:12 AM
#12
Scooby Regular
Join Date: Jan 2003
Location: I wish we had a non-profit making website to put here.
Posts: 1,185
Likes: 0
Received 0 Likes
on
0 Posts
I had 7bs in mine when it was about 310bhp, so only mildly modded. It cured a slight missfire, but I didn't need them until the boost was cranked up. Save the £30 for Optimax until you need them mate.
20 November 2004, 10:15 AM
#13
Scooby Regular
Join Date: Jan 2000
Location: a more anarchic place
Posts: 1,828
Likes: 0
Received 0 Likes
on
0 Posts
JB is correct, NGK PFR8Bs were discontinued.
Closest replacement I could find is the NGK 7435-8.
I found www.spark-plugs.co.uk very knowledgable and helpful
Closest replacement I could find is the NGK 7435-8.
I found www.spark-plugs.co.uk very knowledgable and helpful
20 November 2004, 10:17 AM
#14
Scooby Regular
Join Date: Apr 2002
Location: Bournemouth - 5x Ex Impreza owner. 997 GT3 CS.
Posts: 7,333
Likes: 0
Received 0 Likes
on
0 Posts
The 8's aren't too good when cold apparently, so unless you need them, stick with the 7's and replace a bit more frequently than the recommended 40/50k interval.
MB
MB
20 November 2004, 10:58 AM
#16
Scooby Regular
Join Date: Nov 2000
Location: 32 cylinders and many cats
Posts: 18,658
Likes: 0
Received 1 Like
on
1 Post
Well the BKR7EIX are shown in post #7 by Jim and sold as STi. I have some BKR8EIX to try at some point as well - they are much much cheaper than the R7434-8.
25 November 2004, 10:37 PM
#22
Scooby Regular
iTrader: (9)
Join Date: Oct 2003
Location: InTheSticks
Posts: 6,120
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by harvey
NGK PFR7B are a good reliable plug for reasonable cost and operated well for me. Unfortunately around 500 bhp I was persuaded to try an "upgrade" to HKS 35i. Broke the electrode insulator on one and heard of others that broke around the same time.
Now running NGK PFR7B at 300bhp / 300 nm - no probs yet!
25 November 2004, 10:56 PM
#23
Scooby Regular
Join Date: Apr 2002
Location: Bournemouth - 5x Ex Impreza owner. 997 GT3 CS.
Posts: 7,333
Likes: 0
Received 0 Likes
on
0 Posts
Normal life is over 60k, but if its modded it would be wise to change them a bit more regularly. The cost of this far outweighs any other consequence
For most of us, 40k miles is a good 3-4 years, so £35 for plugs isn't worth thinking about...
MB
For most of us, 40k miles is a good 3-4 years, so £35 for plugs isn't worth thinking about...
MB
27 November 2004, 06:43 PM
#24
Originally Posted by Dark Blue Mark
Normal life is over 60k, but if its modded it would be wise to change them a bit more regularly. The cost of this far outweighs any other consequence
For most of us, 40k miles is a good 3-4 years, so £35 for plugs isn't worth thinking about...
MB
For most of us, 40k miles is a good 3-4 years, so £35 for plugs isn't worth thinking about...
MB
Thread
Thread Starter
Forum
Replies
Last Post
Brzoza
Engine Management and ECU Remapping
1
02 October 2015 05:26 PM
