This is off the l67 torque forum a member did some tests on the different coils because the l67 coils were supposed to be more powerful but we had a lot members running MSD,ecotech and l67 coils without any problems and these guys were seeing 6500 rpm without any inigtion failure
Hi Guys I have been doing a bit of testing with various genuine Holden coil packs. I have 3 sets of l67 coils and 3 sets of standard emotec coils and 1 set of MSD's
I have used the Holden test procedure from the diagram below.
Our results as follows..
Std Emotec Coil Packs: Gray Bottom
Low voltage side (Bottom)
0.9
0.9
0.9
0.9
0.9
0.8
0.9
0.9
0.9
High voltage side (Top)
5800
5680
5750
5800
5800
5700
5810
5800
5700
L67 Coil Packs: Blue Bottom
Low voltage side (Bottom)
0.8
0.9
0.9
0.9
0.9
0.9
0.8
0.9
0.9
High voltage side (Top)
5640
5730
5750
5800
5800
5750
5800
5800
5750
As you can see from this the coil packs read on average exactly the same.
So against common belief there doesn't seem to be a difference between blue and white packs.
I called a friend from GMH engine assembly and production last night and he seems to think that the coil pack, DFI and mounting bracket was imported as a unit from the US plant because of the fewer numbers needed for production runs in Australia.
This would explain the different color bases and Part numbers.
The MSD coil packs findings were very different to the specifications on there web site: Go Figure..
Here's what we found using the same Holden test method as above on the MSD Coil Packs..
MSD Coil Packs: Gray Bottom
Low voltage side (Bottom)
0.8
0.8
0.8
High voltage side (Top)
5660
5640
5790