Digital Cruise Control - F23 swap / 3500 LZ4 running on Microsquirt (Page 1/1)
mhale73 APR 15, 11:34 AM
My Fiero has a 3500 LZ4 with a turbo and using Microsquirt for a standalone ECU. I also just recently did the F23 swap. Now that all of that was done, I wanted to get my cruise control working. Not having a stock ECU with a VSS output has created a bit of a problem. So here is what I came up with:

I ordered the latest Dakota Digital SGI-100BT model. It appears this is a bit different than the SGI-5. Most noticeable having Bluetooth and an app for adjusting it with a phone or tablet and from what I hear, it is a bit smoother than the SGI-5.
I had some issues figuring out how to wire this up, so this is what worked for me.

Dakota Digital wiring instructions I used was for application #2
IGN = accessory power 12v
GND = GND
SPD+ = not used
INPUT = VSS from trans (yellow wire at c203 going to engine bay)
SPD- = not used
OUT1 = not used
OUT2 = not used
OUT3 = input to speedometer (yellow wire at c203 going to speedometer)
OUT4 = wired to AR cruise module (pin K at cruise module)
OUT5 = not used
https://www.dakotadigital.com/pdf/SGI-100BT.pdf


The only wiring method that worked for me was the relay method (sinister performance) and I did have to ground pin G (AR module). I tried several modules (AR, V8 and EK) with the non-relay method and none would work.
http://www.gmtuners.com/fil...ise_elect_cruise.pdf

I am planning to retest the other modules (V8 and EK) to see if they work with the relay method, but as of now I know the AR module is working. I will add an update with my findings.
Spadesluck APR 15, 12:32 PM
First, welcome to the forum!

Additionally, I very much appreciate the sharing of this work! I have an AR digital cruise currently that is wired to work with the old stuff, but this setup may change later. I also have the Dakota Digital SGI-100BT to make my F40 work with my 4.9. Please keep us updated on your findings.

Digital cruise gets brought up from time to time. I am actually surprised it doesn't get brought up more often as the stock stuff is so unsightly and has a tendency to go bad.
mhale73 APR 17, 02:11 PM
I had it working for a bit with the AR module, then it quit. I then tried the V8 module and it worked for a little longer. I tried my other V8 and EK modules that I also had and they didn't work at all. Now neither does the AR and the V8 that both worked. My thought is that they don't like the signal from the SGI-100BT. I am going to wire it to the buffered output of the speedometer like described in the article below.

http://fieros.de/en/articles/digcruise.html
Spadesluck APR 17, 03:55 PM
That's how I have mine wired. I used Oliver's writeup.
La fiera APR 17, 10:05 PM
If you get the Shadow Dash from MS in an Amazon tablet you can have a real GPS speedometer. I think the software is $14.99 and the tablet is $90 at Amazon.
That's what I use in my Fiero. Not only that but the Shadow MS can datalog while you drive.
zkhennings APR 21, 07:55 AM
I’ve seen your car on youtube and facebook, do you have a build anywhere for it? I’m swapping an LZ9 with Microsquirt and I’m interested to see what you did for your swap. I did notice how you mounted the turbo to the crossover and the EWG to the stock outlet flange and thought that was a very clever way to set that up.

[This message has been edited by zkhennings (edited 04-21-2022).]

mhale73 APR 23, 05:52 PM

quote
Originally posted by zkhennings:

I’ve seen your car on youtube and facebook, do you have a build anywhere for it? I’m swapping an LZ9 with Microsquirt and I’m interested to see what you did for your swap. I did notice how you mounted the turbo to the crossover and the EWG to the stock outlet flange and thought that was a very clever way to set that up.




When I added the f23, I ended up with the turbo interfering with the f23 shift linkage, so I had to relocate it. This caused a chain reaction and then the turbo outlet is now on the bottom. It actually works better this way for routing the charge piping to the a/w intercooler which is mounted near the fuel filter.