I have been meaning to post on this for awhile now, but have not really had the time...I have been driving the car alot since the install in late May...

The install went without any complications..Except the wiring connector was different... Apparently GM used a different harness in later models... The wires are all the same, so I just cut the connector off and spliced the wires together. No big deal. Remember this was a free unit they shipped for testing. Anyway I let MSD know about it and they had an active response so I assume they found a solution... If not its only 4 wires, so splicing is not that big a deal.

Performance wise the car runs much smoother.... no doubt this is due as much to the miserable condition of my old opti before it died, as the MSD.. Anything would have been a improvment ..

The car fired right up and found idle right away... I was
I took it out and puttered around the neighborhood a few times to warm everything up.. then went for the nearest on ramp. She fell on her face ...Long story short I did that twice. The timing was advanced too far from the factory and the computer was pulling time to aviod detonation. I turned the timing screw back a total of 1 3/4 turns and now its running good. I was thinking of running some race gas through just to see how far I could go with the timing...
But once again I havent had time to even get to the damned track yet so that will probly never happen soon.

Anywaay its a huge improvment over the stock unit, comparing the two side by side the MSD just laughs at the OEM opti.
I cant speak to the longevity of the MSD unit, but I have been running a 6al box, and Blaster coil for 3 years with no issues... Ive got the 8.5 wires too, but they aint 3 years old I trust this new product should last at least as long... really longer

Here is my orignal thread w/ picshttp://forums.corvetteforum.com/show...post1555363312

 

Yes, the '92 connector is different.
But, you don't have to cut the wires and splice the connectors.
All you have to do is get a "pin ejector" tool at Pep Boys and eject the pins from one connector and put them in the same location in the other.
So:
Pin A in one connector goes in Pin A in the other.
Pin B in one connector goes in Pin B in the other.
Do the same for Pins C and D.

No splicing needed.

Tom Piper

 

Just finished installing the MSD optispark on my '93.I was disappointed that there was no machined groove to install the o-ring,the shoulder is not wide enough to hold the o-ring.This is a blind assembly that is very critical to the life of the part.It took me an extra hour to make sure it was properly seated,and I still not sure because its a blind assembly.
Also,I could not get the waterpump to seat,after four tries I discovered that the pump was hitting one of the flanges of the new optispark.I had to grind off about 1/16 " of the pump housing to get it to seat.
Tommorow I will fire it up,hopefully it will run.
Ray

 

Just a side note, let MSD know of these problems, as they will refine there product I am sure.

 

yes but the one connector is part of the opti.. you cant just snip it off
the MSD connector on left.... OEM opti on right






This is the OEM harness that runs from the manifold to the opti.. I snipped the end off this and the end off the MSD harness then plugged it back up at the manifold. So I can still just unplug the Opti if neccesary



This is where it plugs in at the manifold.... I sent MSD all these photos and more to show them what the issue was.

I never had any problems with the water pump... everything bolted right up... The O ring did fight me though... I wound up putting permatex on the outside grove.. Thatt kinda stuck the O ring where it needed to be untill I got things tightned down

 

I can't tell you about the MSD Opti-Spark connector.

But, I can tell you for a fact about the OEM Opti-Spark connector.
I'm talking about the connector under the right-side fuel-rail cover where the main harness connects to the short extension harness going to the Opti-Spark.
Years ago, I think I was one of the first ones to convert my '92 to the later vacuum vented Opti-Spark during a cam change. At that time, there were no posts on this subject that I could find.
And, with the new extension harness, I simply ejected the pins and put my old connecter on the new harness by the procedure in my post above -- once again, this is the connector under the fuel-rail cover only.
And, about a month ago, since I have a Delteq that came with two sets of connectors (the "T" harness) for a '92 under the fuel-rail cover, I decided to switch to the later connectors for everything. This way, in the future, if I needed a new Opti-Spark and bought the MSD or DynaSpark with the harness as part of the Opti, I wouldn't have to change anything -- just plug it in.
So, I ejected the pins (once again) and put all later connectors on mine with NO splicing at all.

Tom Piper

 

After installing the MSD I have the same problem when accelerating,the engine cuts out.The instructions for it says that the timing screw is turned out 2 turns to meet factory specs,on mine I found out it was really 2 1/2 turns.Does backing it out more reduce or increase the timing?The instructions sent give no clue.If you backed yours out 1 3/4 tunrs more it must be further away from the factory spec.I am going to call MSD to find out which rotation does what.
Ray