LS1 and Bosch Fusion +4 Spark Plugs
Thread Starter
Joined: Mar 2000
Posts: 43,187
Likes: 45
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
LS1 and Bosch Fusion +4 Spark Plugs
One word - Don't.
Supreme Member
Joined: May 2000
Posts: 2,963
Likes: 3
Car: 1982 Z28
Engine: LS1
Transmission: T56
Joined: Apr 2007
Posts: 136
Likes: 1
From: Grand Rapids, MI
Car: 87 iroc Arctic White w/gold ss stri
Engine: Turbo'd 5.3 in process
Transmission: T-56 w/SPEC stage 3+ clutch
Axle/Gears: 9" Moser w/3.25's
Re: LS1 and Bosch Fusion +4 Spark Plugs
NGK for me!
Thread Starter
Joined: Mar 2000
Posts: 43,187
Likes: 45
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
I got it running last week, just reused the plugs that were in it, those Fuson things. It ran fine for the first several passes, then started dropping off in eliminations.
Had it in the shop for completion of the exhaust during the week, picked it up Friday afternoon, when I started it up to head for the track it was only running on 7. Checked all connections, everything okay. Got on it and it cleaned up. Made my first time trial pass, it started cutting out in 2nd gear, then was mostly 7 cylinders through 3rd gear. Got back to the pits, pulled the plugs (managed to burn myself on the headers a couple of times), borrowed my son's truck and ran to the parts store and picked up a set of NGK Platinum's. Gapped, installed, no more problem.
It wasn't clear which plug wasn't firing, but it clearly was better with the simple NGK single ground plugs.
Had it in the shop for completion of the exhaust during the week, picked it up Friday afternoon, when I started it up to head for the track it was only running on 7. Checked all connections, everything okay. Got on it and it cleaned up. Made my first time trial pass, it started cutting out in 2nd gear, then was mostly 7 cylinders through 3rd gear. Got back to the pits, pulled the plugs (managed to burn myself on the headers a couple of times), borrowed my son's truck and ran to the parts store and picked up a set of NGK Platinum's. Gapped, installed, no more problem.
It wasn't clear which plug wasn't firing, but it clearly was better with the simple NGK single ground plugs.
Supreme Member
iTrader: (8)
Joined: Jan 2000
Posts: 3,968
Likes: 1
From: Macedonia ,OH
Car: Formula
Engine: 6.0 LSX
Transmission: 4L60E
Axle/Gears: 9 Bolt 3:27
Re: LS1 and Bosch Fusion +4 Spark Plugs
I run the TR55's in the car and the stock AC Iridiums in my 07 2500HD
Trending Topics
Thread Starter
Joined: Mar 2000
Posts: 43,187
Likes: 45
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
They wanted to sell me $7/each AC Iridiums, saying "These are stock - I think."
What did they put in from the factory?
What did they put in from the factory?
Supreme Member
iTrader: (5)
Joined: Jan 2002
Posts: 13,622
Likes: 5
From: Orland Park, IL
Car: 1984 Z28
Engine: SLOW carbed ls
Transmission: TH400 with brake, 8" PTC converter
Axle/Gears: moser 9" 4.11
Re: LS1 and Bosch Fusion +4 Spark Plugs
NGK TR55 would be perfect for you 
Supreme Member
Joined: May 2004
Posts: 2,924
Likes: 1
From: Kingston, Tn
Car: 1987 GTA
Engine: LT1
Transmission: T56
Axle/Gears: 9 bolt 3.70 posi
Re: LS1 and Bosch Fusion +4 Spark Plugs
AC/Delco Platinums are what came in from the factory, TR55 NGKs are pretty much the best plug out there. If you can get the TR55s, you can use a TR5 which just isn't pre-gapped to .050 which is what the second 5 is, heat range 5 and gapped at .050 are what the last two digits stand for.
Thread
Thread Starter
Forum
Replies
Last Post
evilstuie
Exhaust
24
Feb 28, 2016 03:33 PM
