Which coil pack do you have? - Page 2 - ZR-1 Net Registry Forums

Fully Vetted · 10-18-2012

MSD

tomtom72 · 10-19-2012

I had originally changed out my OE coils for Jegs coils when I did my injector replacement. Subsequently I changed out the Jegs coils, after 3 yrs, for GM coils. The GM coils have been in there for about 32k miles and seem to be just fine. I didn't see any evident difference between the two brands by looking at my plugs, AC 41-602's, which I change every year.

The reason for going back to the GM coils was that they are specifically for an LT5, or so GM says; where the Jegs coils had other applications besides an LT5. I figure the environment in the valley of an LT5, for the coils, is fairly harsh temperature wise.

Tom

Daniel_Mc · 10-19-2012

Working on a Z now that has Screamin Demon coils and nology wires (really different looking wires).

Daniel

vilant · 10-19-2012

Quote:

Originally Posted by tomtom72

The reason for going back to the GM coils was that they are specifically for an LT5, or so GM says; where the Jegs coils had other applications besides an LT5. I figure the environment in the valley of an LT5, for the coils, is fairly harsh temperature wise.

Tom

Good point. I wonder how much testing went into the non-OE coils, being used on the LT-5, other than our members here. From what I've read it gets PD hot under there.

vilant · 10-19-2012

Quote:

Originally Posted by Daniel_Mc

Working on a Z now that has Screamin Demon coils and nology wires (really different looking wires).

Daniel

You don't happen to have pics or a p/n would you?

XfireZ51 · 10-19-2012

I've had the same set of MSD coils and wires for the last 3+ years. Also used MSD coil and wires on my 84 HEI system together w the MSD 6A box.
The 6A finally died after 10 years.

sdycke · 10-19-2012

A very timely question for me. A month ago I installed 4 new MSD coils and got 8 misfiring plugs. A switch back to OE Delco works fine. The MSD were made in.....China (No!!!!). Advice to myself: dont swap for the sake of 'not having to go under there again' (you will regardless and get used to it) and if you have a problem with coils, use OE parts.

Daniel_Mc · 10-19-2012

Quote:

Originally Posted by vilant

You don't happen to have pics or a p/n would you?

Coils, wires, or both? I don't have it back together so it would be easy to pop a few pictures.

Daniel

tomtom72 · 10-20-2012

Quote:

Originally Posted by vilant

Good point. I wonder how much testing went into the non-OE coils, being used on the LT-5, other than our members here. From what I've read it gets PD hot under there.

I wish I could give a better thought process or some testing evidence that supports my thought Joe, but I don't have anything. All I know is that GM listed two P/N's of coils like our coils. One P/N is for an LT5 motor and the other P/N is for other GM applications. Now this was like back in 07 or maybe 08, and I don't know what they list now. We all know how long it takes for an LT5 to get stone cold after reaching normal operating temps, so I just chickened out with the Jegs coils! LOL Besides the spark plugs told me nothing by just looking at the tips, and I didn't cut them.

But still I saw no difference, and I just threw out plugs going back to 06. The only modification or liberty I took with ignition parts was a set of Magnacore 10mm wires specifically for an LT5.

Tom

CJ_ZR1 · 10-21-2012

Quote:

Originally Posted by Daniel_Mc

Coils, wires, or both? I don't have it back together so it would be easy to pop a few pictures.

Found pic from before we started project, can post some close ups Monday.

Nology Hot Wires

View Poll Results: Which coil packs do you have?
AC Delco	53	71.62%
Accel	4	5.41%
MSD	17	22.97%
Voters: 74. You may not vote on this poll

10-18-2012	#11
Fully Vetted Join Date: Sep 2012 Location: Rockwall, Tx Posts: 1,510	Re: Which coil pack do you have? MSD

10-19-2012	#12
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: Which coil pack do you have? I had originally changed out my OE coils for Jegs coils when I did my injector replacement. Subsequently I changed out the Jegs coils, after 3 yrs, for GM coils. The GM coils have been in there for about 32k miles and seem to be just fine. I didn't see any evident difference between the two brands by looking at my plugs, AC 41-602's, which I change every year. The reason for going back to the GM coils was that they are specifically for an LT5, or so GM says; where the Jegs coils had other applications besides an LT5. I figure the environment in the valley of an LT5, for the coils, is fairly harsh temperature wise. Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

10-19-2012	#13
Daniel_Mc Join Date: Jan 2007 Location: Pineville, LA Posts: 586	Re: Which coil pack do you have? Working on a Z now that has Screamin Demon coils and nology wires (really different looking wires). Daniel

10-19-2012	#16
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,669	Re: Which coil pack do you have? I've had the same set of MSD coils and wires for the last 3+ years. Also used MSD coil and wires on my 84 HEI system together w the MSD 6A box. The 6A finally died after 10 years. __________________ [SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX

10-19-2012	#17
sdycke Join Date: Jul 2011 Location: grosse isle, manitoba, canada Posts: 52	Re: Which coil pack do you have? A very timely question for me. A month ago I installed 4 new MSD coils and got 8 misfiring plugs. A switch back to OE Delco works fine. The MSD were made in.....China (No!!!!). Advice to myself: dont swap for the sake of 'not having to go under there again' (you will regardless and get used to it) and if you have a problem with coils, use OE parts.