Megasquirt question.
MegaSquirt Mod
Joined: Sep 2004
Posts: 4,721
Likes: 1
From: Maryland
Originally Posted by WonkoTheSane
short version: Right now ignition doesn't fully work with the MS unit, and the stock CAS and coils.
Long version: There are quite a few people (some on this forum), that are hacking at it to try to get the MS to deal with the stock systems, and it sounds like its close to be solved.
Longer: They're coming out with the Megasquirt Revision II (MS2), that will allow stock timing equipment to be used. The first production batch has been released. The next batch won't go out until the end of july-ish.
You can however install the latest MSnS-extra firmware on a modded megasquirt (we just built a VR sensor conditioner circuit... with dual lm1815 chips and minimal other parts, you also need some pullup resistors added to the MS board to run leading, and eventually trailing). And you need to restab the CAS.... none of these things are hard to do.
You could always do what I'm doing: Use a distributor from a 12a to control your ignition. Not as cool as having control over it, but it will free you from the burden of having to rely ont he stock ECU and wiring to get it up and running, and you can rid of your AFM 
I plan on switching back to tstock equipment as soon as the code is stabilized.. I dont' have the time right now to play with it, or else i'd try to figure out how to do it...
The only thing that's not working yet is trailing.... I expect that'll work as soon as the author of the msns-extra code gets to it in the next several weeks.... and I'll be testing it on the oscilloscope when he's done... and then if it works on the oscilloscope, I'll hook it up to the car.
The car runs great on leading only right now though.
Using the stock air temp sensor requires you to change a resistor on the megasquirt board, AND use EasyTherm to regenerate the temperature-resistance curve of the sensor. The stock coolant sensor works fine with the normal resistor in the megasquirt, but you still have to change the resistance values in easytherm.
tofuball and I are just using a General Motors air temp sensor (no easytherm required for this)... we're going to get an open-cage type and mount it directly in the air stream for better response when tofuball redoes his intake system. We're using the stock coolant temperature sensor, and so far there are no problems with this, and it seems plenty accurate.
Last edited by muythaibxr; May 25, 2005 at 09:36 AM.
MegaSquirt Mod
Joined: Sep 2004
Posts: 4,721
Likes: 1
From: Maryland
Originally Posted by Tofuball
Its not that complex, you just plug in the TPS the the TPS input on the megasquirt and calibrate it. Use TPSdot 
I'm using the stock injector wiring and everything.
Use TPSdot I'm using the stock injector wiring and everything.
and for the TPS... you run the +5v vref (power) to the tps, and run the tps signal wire to another pin on the megasquirt connector, and you're set....
Calibrating it is as easy as going to "tools->calibrate tps" in megatune, and then pushing "get value" for no throttle... then pushing the throttle all the way down and pushing another "get value" button...
it's really that easy... and we're also doing this on tofuball's car
muythaibxr - wow, I didn't realize you guys have gotten that close.. Sorry for the insult, there I'm going to bug you in a while to see how everything comes.. when the trailing gets hooked up, i'll set it up on my car
Awesome. good work, guys.
I'm going to bug you in a while to see how everything comes.. when the trailing gets hooked up, i'll set it up on my car Awesome. good work, guys.
MegaSquirt Mod
Joined: Sep 2004
Posts: 4,721
Likes: 1
From: Maryland
Originally Posted by WonkoTheSane
muythaibxr - wow, I didn't realize you guys have gotten that close.. Sorry for the insult, there I'm going to bug you in a while to see how everything comes.. when the trailing gets hooked up, i'll set it up on my car
Awesome. good work, guys.
I'm going to bug you in a while to see how everything comes.. when the trailing gets hooked up, i'll set it up on my car Awesome. good work, guys.
Full Member
Joined: Jul 2001
Posts: 249
Likes: 0
From: Lavonia, GA
Originally Posted by muythaibxr
Leading works fine with stock CAS and leading ignitor and coil... we're running it on tofuball's car.
So far there aren't any more problems... I figured out a good value for the pullup resistor on the output to the ignitor, and it works great.
It's not necessary to wait, and there aren't any set plans for supporting the stock rotary stuff in MS2.
You can however install the latest MSnS-extra firmware on a modded megasquirt (we just built a VR sensor conditioner circuit... with dual lm1815 chips and minimal other parts, you also need some pullup resistors added to the MS board to run leading, and eventually trailing). And you need to restab the CAS.... none of these things are hard to do.
See above, tofuball and I are running stock CAS, and leading ignitor/coil with MSnS-extra's wheel decoder code and we're also controlling aux ports, and VDI; all without any problems.... and without the stock ECU... I believe the AFM is even unplugged, and only there in order to provide a mount for the APEX'i air filter.
It's fairly easy to do right now... the code is perfectly stable for stock leading too... when I watch the timing with a timing light the advance wavers less than stock. Like I said before, it just requires you to build a dual lm1815 circuit (I have the circuit diagram... and have a working circuit in tofuball's car).
The only thing that's not working yet is trailing.... I expect that'll work as soon as the author of the msns-extra code gets to it in the next several weeks.... and I'll be testing it on the oscilloscope when he's done... and then if it works on the oscilloscope, I'll hook it up to the car.
The car runs great on leading only right now though.
Using the stock air temp sensor requires you to change a resistor on the megasquirt board, AND use EasyTherm to regenerate the temperature-resistance curve of the sensor. The stock coolant sensor works fine with the normal resistor in the megasquirt, but you still have to change the resistance values in easytherm.
tofuball and I are just using a General Motors air temp sensor (no easytherm required for this)... we're going to get an open-cage type and mount it directly in the air stream for better response when tofuball redoes his intake system. We're using the stock coolant temperature sensor, and so far there are no problems with this, and it seems plenty accurate.
So far there aren't any more problems... I figured out a good value for the pullup resistor on the output to the ignitor, and it works great.
It's not necessary to wait, and there aren't any set plans for supporting the stock rotary stuff in MS2.
You can however install the latest MSnS-extra firmware on a modded megasquirt (we just built a VR sensor conditioner circuit... with dual lm1815 chips and minimal other parts, you also need some pullup resistors added to the MS board to run leading, and eventually trailing). And you need to restab the CAS.... none of these things are hard to do.
See above, tofuball and I are running stock CAS, and leading ignitor/coil with MSnS-extra's wheel decoder code and we're also controlling aux ports, and VDI; all without any problems.... and without the stock ECU... I believe the AFM is even unplugged, and only there in order to provide a mount for the APEX'i air filter.
It's fairly easy to do right now... the code is perfectly stable for stock leading too... when I watch the timing with a timing light the advance wavers less than stock. Like I said before, it just requires you to build a dual lm1815 circuit (I have the circuit diagram... and have a working circuit in tofuball's car).
The only thing that's not working yet is trailing.... I expect that'll work as soon as the author of the msns-extra code gets to it in the next several weeks.... and I'll be testing it on the oscilloscope when he's done... and then if it works on the oscilloscope, I'll hook it up to the car.
The car runs great on leading only right now though.
Using the stock air temp sensor requires you to change a resistor on the megasquirt board, AND use EasyTherm to regenerate the temperature-resistance curve of the sensor. The stock coolant sensor works fine with the normal resistor in the megasquirt, but you still have to change the resistance values in easytherm.
tofuball and I are just using a General Motors air temp sensor (no easytherm required for this)... we're going to get an open-cage type and mount it directly in the air stream for better response when tofuball redoes his intake system. We're using the stock coolant temperature sensor, and so far there are no problems with this, and it seems plenty accurate.
Happy Squirter
Joined: Feb 2004
Posts: 263
Likes: 0
From: Lyman, SC
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