LS1 and Bosch Fusion +4 Spark Plugs
09-11-2010, 12:00 AM
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09-11-2010, 12:13 AM
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Car: 1989 Formula,1991 z28
Engine: 400 Vortec Hsr,496bbc
Transmission: TKO600,TH400
Axle/Gears: 9"4.10, 9"3.73
Re: LS1 and Bosch Fusion +4 Spark Plugs
Good ole NGK is plenty good... screw that over hyped junk.
09-11-2010, 11:05 AM
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/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.
09-11-2010, 11:12 AM
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Car: 1989 IROC-Z, 1979 Malibu Classic
Engine: LSx 5.3
Transmission: MN12 6-speed, 4L60E
Axle/Gears: 4th gen 3.42
Re: LS1 and Bosch Fusion +4 Spark Plugs
AcDelco's FTW 
09-11-2010, 12:05 PM
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09-11-2010, 01:53 PM
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/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?
09-11-2010, 04:17 PM
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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.
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