What should they be gapped at? I think I'm seeing a misfire on down low hard acceleration using autolite 103's (3 heat ranges colder)

I was thinking of gapping them at .050-.052 they are gapped at .055 or if that fails trying my NGK TR6's (2 ranges colder)

------------------
3800 SC/IC Fiero fixed and weeeeeen'in again!

try www.clubgp.com they've got tons of info for the supa-charged engine

been looking around there but been getting different opinions.. guess it's trial and error I'll try it at .052 tomorrow morning. I nabbed 3 of them before the sun went down so that's a plus

thanks for the input anyways though!

Iridium plugs can be gapped at 0.055-0.060", I run mine at 0.050" because of the amount of boost I run.

Copper plugs should be gapped at 0.050"

Oh and I am running the Denso IT22 Iridium plugs which are 4 heat ranges colder than stock.

------------------
power corrupts. absolute power corrupts absolutely.

Custom Computer Tuning | Engine Conversions | Turbocharging | www.gmtuners.com

[This message has been edited by Darth Fiero (edited 07-19-2005).]

tried the NGK TR6's gapped at .050 cured seems a little more peppy to that's always a plus!

thanks for the feedback on the gapping Ryan

i run the tr6's at .45, it seems to run alot better with n2o

------------------
'87 GT
93 3800sc series I / 4t60e 7.597 1/8mile ET
1.579 60'
88.53 mph

Swapping to series2
Comp cam, ported polished heads
3" pulley ,42lb injectors, 125 shot n2o

F40 Replica from V8 Archie
Archies Interior
350/5sp comp cam, roller rockers
600cfm edlebrock carb

Does gap really make that much of a difference? I think mine are at .55. Should I scale it back? They are 103's, 3 temp ranges cooler.

------------------

1988 Purple Fiero GTw/SC3800 conversion
Best ET with 3.0 pulley,XPHOT cam, SS I/C and 105lb Valve springs: 12.52@110mph
Best 60 Foot ever: 1.735

quote Originally posted by SOULCRUSHER: Does gap really make that much of a difference? I think mine are at .55. Should I scale it back? They are 103's, 3 temp ranges cooler.

I have read alot of Threads that say the gap makes a big diffeance and can get rid of KR but seems kinda iffy to me. But I am pretty new to the 3800 scene so my comment is just an opinion and not fact. I run AL 104s and gapped them at .55 and have no KR with my setup now that I finally found the problem. I am installing an IC now and will probally stick with the same plugs instead of going with colder ones.

gap effects a bunch as I read over clubgp for about 2-3 hrs last night.

I guess a guy over there had his gapped at .070!! and he wasn't getting KR of any sorts and ran a 13.1 with a 3.4 pulley. It's all trial and error some motors like different settings. I had mine gapped at .048-.050 I have to find a real gapping tool that coin looking POS sucks.

quote Originally posted by SOULCRUSHER: Does gap really make that much of a difference? I think mine are at .55. Should I scale it back? They are 103's, 3 temp ranges cooler.

Like Low_key said, it depends on the car. The reason why I said gap your copper plugs less than your Iritium or Platinum ones is because the plat/irit plugs have less firing resistance and a hotter spark which doesn't "blow-out" as easily under boost. Again, this all depends on your engine, its mods, fuel, ignition system, amount of boost, etc. I would try out some different gaps and see what works best for you.