drv

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

novaflash2002

iTrader: (51)

30-35 is fine i and a few of my buddys run at 28 to 32

drv

Any better choices?

barnat

iTrader: (59)

I too had to lower my gap from 35 to 20 while having it dynoed last week .For some reason 35 was just to much and it was like back fireing or the spak was being blown out while under boost ?As soon as we changed the NGK plugs and reghaped to 20 everthing was golden

AFASTYZFR1

iTrader: (55)

NGK BR7EF @ .028

7 heat range, resistor, non-projected tip

works perfectly in my car

98Z28CobraKiller

iTrader: (17)

I believe that is the same plug that I run (#7317). I run mine at .022 and run very consistant high 8's @ 19# boost.
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.

drv

Stock # 7317 is part #R5724-8 which is what I run on my sbc thought about using on my Ls but not sure since most of the post here suggest tr6.

Thanks for all the replies
Tony

WS6HUMMER

iTrader: (19)

TR6's @ .028 12 psi & pump gas here

hymey

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!

Hank Peabody

iTrader: (2)

I use BR7EF at .020 and it works good

Orangemagic

iTrader: (2)

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.

Tzion_ben_Arthur

iTrader: (19)

same here. I had spark blow-out above .032

mike13

iTrader: (27)

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.

WS6HUMMER

iTrader: (19)

I've ran TR6's for a while at lower boost levels (12 psi & lower) they work ok for me but I change them every trip to the track which is only a couple times a year. I did make a few passes @ 15 psi but IAT's were getting so high the tune was pulling timing (158* and higher) with a rich AFR (in the 10's).

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

JoshuaGrooms83

iTrader: (2)

quick question, what gap did you have your TR6ix plugs gapped at for turbo boost apps? im planning on about 10-12 max (2 bar map limited) and was wondering

Sales@Tick

iTrader: (3)

Please do your engines a favor and run a cooler plug than a tr6!!!

We run R5724-7 or -8 for most boosted vehicles at our shop.

ronnieforrester

iTrader: (3)

what about 15psi on E85- Ive read on here that E85 was a lil harder to light off.


I bought both the TR6 and BR7EF for my 4.8 Turbo project.

Sales@Tick

iTrader: (3)

Run the br7.

Wicked69

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

JoshuaGrooms83

iTrader: (2)

um wow, i just opened a can of worms didnt i lol didnt know there were so many NGK plugs to run on boost.