B_1_8_hatch

i'm running 2 degree colder plugs and i'm about to install an msd kit. what should i gap my plugs at? i was thinking at about .034, what do you guys suggest?


thanks

TurboDANDEE

.28 should be a good start, the trick is to have the smallest gap as possible without it missfiring/hesitation on the low end.

Mista Bone

how much boost/spray????

I'm still at .035" on the champion plugs and 85 shot.

Still nailing 40+ mpg on the highway too!

B_1_8_hatch

8-10lbs of boost. i have my plugs at .030 right now. i'm usning 2 degree colder plugs.

GDM Z28

im using 2 step colder plugs and im running a .30 gap

B_1_8_hatch

i thought people use msd so they can run a bigger spark plug gap, not a smaller one?

Mista Bone

you haven't thought about boost or nitrous then.

B_1_8_hatch

so smaller is better? i'll start out at .028 when i get my new plugs.

TurboDANDEE

the bigger the gap, the more chance the boost can blow out your spark.

B_1_8_hatch

thanks

94dxt

I always thought the goal was to get away with as big of a gap as you can w/out missing under boost. That way you can have the best idle and low end as possible. I found that w/my BTM, coil, wires, ect. I needed .03"-.032"

TurboDANDEE

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 94dxt &raquo;</TD></TR><TR><TD CLASS="quote">I always thought the goal was to get away with as big of a gap as you can w/out missing under boost. </TD></TR></TABLE>

ya thats what i meant

keep gapping it down until it stops missfiring and also have a good spark on the low end at the same time.

B_1_8_hatch

i have mine at .030 right now, should i try to go down?

TurboDANDEE

is it missfiring on top end?

B_1_8_hatch

i feel a little hesitation like when i'm at higher rpm. i never felt it before i put the msd on. it could be a misfire, but it feels like a little hesitation. i just tried it out last night for the first time.

TurboDANDEE

could be missfire or running too rich. if it is, just keep gapping it down until it stops.

ekb18c

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93hb &raquo;</TD></TR><TR><TD CLASS="quote">i have mine at .030 right now, should i try to go down?</TD></TR></TABLE>


If it's running good then no need to gap it down. Only gap the plugs down some more if it's miss firing.