Since my factory ECU has the knock module built in I don't know if an external GM unit would be compatible with my sensor. There are several part numbers, not sure which one would work if any.

I plan to write up some docs for people who want to use MS on their TPI, either in the stock F/Y Body or in a swap. Hopefully I can list exactly what to do right the first time so they don't have to spend as much time as it has taken me...

 

http://www.megamanual.com/ms2/knock.htm


Not sure what wells # your factory knock sensor is, but that article should help.

I did that a couple years ago, but I based it on the Microsquirt MODULE.

http://www.microsquirtmodule.com/

I stuck it inside a stock '165 ECM case, and developed the wiring schematic so it mimics 90% of the factory wiring for plug and play. The only thing you have to do is unplug the maf, and wire in a MAP sensor.

http://members.cisdi.com/~anesthes/p...om/megasquirt/

I even have starter project files for a stock L98.


But everyone wants to buy a pre-built MS2 and do it the hard way

The Microsquirt MODULE is a far superior board than the MS2. Less components, it's not as susceptible to interference/noise. It's what most of the commercial MS PNP ECU's are based off.

-- Joe

 

Tried to do some more tuning, I seem to have inconsistency from one startup to another. I had it idling great around 14.5 AFR. Then I shut it off and re start and it is over 15. So I take some fuel out at idle and it is fine again. I shut it off and wait and now it is really fat (13 or less)
I think it might also make a difference if the laptop is connected.

 

Just a quick update: I have the car running on MS2 with the Extra Code. There is still more tuning to be done and I have no emissions or speedometer, but I am making progress.

The most important thing I learned:

SKIP THE B&G FIRMWARE. Go right to the Extra 3.4 firmware. It is way more complicated, but it actually works...

 

IAC Wiring 1991 Camaro 5.0 TPI

The link:
http://www.megamanual.com/ms2/IAC.htm

The square connector at the bottom of this image is what I have:



However, I had to wire it backwards from what they show. I had to swap the two coils to make it work in the correct direction.

The software is set up so IAC=0 is closed, and the motor won't run unless you hold the throttle open. And a high number ~300 is wide open.

This was just for my car, you should check yours and be sure.

 

I have the speedo/VSS working now. No need for any pull-up resistors. These settings worked for me:




VSS settings for MS3X and 91 Camaro with T-5 Transmission.

 

How do you like the MS3?

-- Joe

 

It is great!

I am getting ready to swap a 2010 LS3/TR6060, stay tuned...