MSD Two Step Rev Limiter help

[bartc]

I just put in an MSD Digital 2Step PN 8732 and am using it with an MSD Digital 6AL PN 6425

It works sort of
MSD technical Support was not very helpful.

Are these devices fairly rock solid or do they tend to be flaky.

Here is the situation.
Testing I get three results.
1) If I ease onto the throttle the low rev limiter works everytime
2) If I hit the throttle a little harder, the engine rev past the low limiter about 500 rpms and then drop back to where is should be sometimes and sometimes works like it should
3) If I nail the throttle, the engine will rev right past the low limiter most of the time.

This is testing from a 750rpm idle to full and partial full throttle positions

MSD says to check the ground and have both boxes grounded together. I dont have the boxes grounded at the same point but feel I have a good solid ground 

Got any words of wisdom?

[548h]

Usually the MSD stuff works great. Attention to detail on the wiring will usually yield good results. If you want to test your ground location you can put a graphing meter or scope on it and operate the system. If there's any issue with ground plane it will show up like that. Or you could run a second ground all the way to the battery negative as a test. If that makes it go away then you know the ground is poor.

[bartc]

Just closing this out.

I grounded the two MSD boxes together and then ran an additional ground wire from the battery to the MSD boxes and took if for a test drive.
Everything seems to work great now. Guess those boxes need a solid ground reference to work properly.

Saturday will be the real world test.