turbo spark pulug and gap
Thread Starter
Teching In
Joined: Apr 2006
Posts: 18
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turbo spark pulug and gap On my turbo sbc with l98 heads at 11 psi 700hp I run NGK R5724-8 at .20 gap has run it for 4 years no problems.
Try to find best spark plug for my new project lq4 block 317 heads target 15 lbs on FI and looks like most of the people here are using Ngk tr6 at gap 30-35. I am concerned because of the difference in heat range.
Before I use them and since most of the search found is old I would like to have new opinions on best recommended spark plug and gap for my new application
Thanks
Tony
Try to find best spark plug for my new project lq4 block 317 heads target 15 lbs on FI and looks like most of the people here are using Ngk tr6 at gap 30-35. I am concerned because of the difference in heat range.
Before I use them and since most of the search found is old I would like to have new opinions on best recommended spark plug and gap for my new application
Thanks
Tony
On my turbo sbc with l98 heads at 11 psi 700hp I run NGK R5724-8 at .20 gap has run it for 4 years no problems.
Try to find best spark plug for my new project lq4 block 317 heads target 15 lbs on FI and looks like most of the people here are using Ngk tr6 at gap 30-35. I am concerned because of the difference in heat range.
Before I use them and since most of the search found is old I would like to have new opinions on best recommended spark plug and gap for my new application
Thanks
Tony
Try to find best spark plug for my new project lq4 block 317 heads target 15 lbs on FI and looks like most of the people here are using Ngk tr6 at gap 30-35. I am concerned because of the difference in heat range.
Before I use them and since most of the search found is old I would like to have new opinions on best recommended spark plug and gap for my new application
Thanks
Tony
On my turbo sbc with l98 heads at 11 psi 700hp I run NGK R5724-8 at .20 gap has run it for 4 years no problems.
Try to find best spark plug for my new project lq4 block 317 heads target 15 lbs on FI and looks like most of the people here are using Ngk tr6 at gap 30-35. I am concerned because of the difference in heat range.
Before I use them and since most of the search found is old I would like to have new opinions on best recommended spark plug and gap for my new application
Thanks
Tony
Try to find best spark plug for my new project lq4 block 317 heads target 15 lbs on FI and looks like most of the people here are using Ngk tr6 at gap 30-35. I am concerned because of the difference in heat range.
Before I use them and since most of the search found is old I would like to have new opinions on best recommended spark plug and gap for my new application
Thanks
Tony
I've been running that same plug for years. My old setup was an LS2 402 with about a 380 shot of nitrous. I ran them with a .029 spark back then but on boost I had to tighten it up as I too was blowing it out. Even still, I ran the car alot NA and it ran 10.3's. I tried switching to a TR6 and alittle more gap and picked up nothing at the track one night. I swapped them back the same night.
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TECH Apprentice
Joined: Jan 2008
Posts: 366
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From: Gladstone, Queensland, Australia
I have never had luck with TR6s and boost just don't stand up to the pressure and high IATs in Northern QLD Australia, after a few passes there blistered from overheating even with rich afrs, BR7EFS are a nice plug to run I am going to B8s tomorrow! Cold non projected are the ones to use!
Got an Idea for you. Every plug is gonna react different to your setup/psi/ compression/elevation. Since plugs are so cheap go buy a couple 2/3 different sets with different heat ranges. Gap them all around 28-30 make sure they are all the same. Inbetween a couple runs switch them out unless your plugs are a PITA to get to.
Be sure you have the tune close before you start switching the plugs out. Check for adv and disadv of each one like knock, hp/tq #s, driveability, color and any other misc things a good tuner would check for.
This is just an idea and I'm by no means an expert on this but only seems a good way to make a right choice on the plugs.
Be sure you have the tune close before you start switching the plugs out. Check for adv and disadv of each one like knock, hp/tq #s, driveability, color and any other misc things a good tuner would check for.
This is just an idea and I'm by no means an expert on this but only seems a good way to make a right choice on the plugs.
I run the NGK TR7IX which are iridums, I know people say to not use them but they seem to work well for me. I've tried the BR7EF's and had to keep lowering the plug gap to .020 and didn't like the idle quality. I run 14-17lbs boost with a 10.2-10.5afr for safety.
I have never had luck with TR6s and boost just don't stand up to the pressure and high IATs in Northern QLD Australia, after a few passes there blistered from overheating even with rich afrs, BR7EFS are a nice plug to run I am going to B8s tomorrow! Cold non projected are the ones to use!
In your experience how were were they blistered? I havent pulled any of the plugs yet but would like to know what to look for. Thanks
TECH Fanatic
Joined: Oct 2011
Posts: 1,425
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I run NGK 7's in the fall, winter, and spring because of the cooler temps. Once summer gets here I run the NGK 8's. E85 from the pump. Gap is .025-.028
What's the difference between the BREF'7's and the 5671A-7? I use the 5671A-7 or 8
What's the difference between the BREF'7's and the 5671A-7? I use the 5671A-7 or 8