EASY MegaSquirtII install? 9 wires. . .
Registered User
Joined: Feb 2002
Posts: 5,645
From: Bridgewater, MA
Nope, it does away with the NBO2 totally if you have a WBO2. You fill out a chart in MS saying what A/F ratio you want at different MAP and RPM. Just like the VE table, but it's A/F ratio instead. You can tell it to shoot for 15/1 at cruise, 12/1 at idle, and 12.5/1 at WOT if you like. MS will actually correct the VE table for you based on the WBO2 readings if it's off. You can also run it with 1 or 2 WBO2's (right and left bank).
Hurry up and try it and let us know how it works out
Registered User
Joined: Feb 2002
Posts: 5,645
From: Bridgewater, MA
I emailed them some questions about getting it to work on the lT1. Here is their email to me:
Jon,
There are a large number of considerations, options, and independent hardware paths that may suit you, but only you know your wants, needs, and abilities. As well, MegaSquirt is a ‘universal’ ECU, and it is up to the user to sort out the details for their vehicle. Others may be able to provide some help on your vehicle, try the forums at www.msefi.com for application specific advice.
You have two main choices to make:
- MS-I versus MS-II processor, and
- V2.2 versus V3 main boards.
Each have their advantages, which you can read about in the documentation.
Whether you can tune it yourself depends on your skills, experience, and ability to read instructions, see: http://www.megamanual.com/ms2/tune.htm
For your specific application, it is not 'officially' supported. However, it may be possible to use it. Ask on the forums at www.msefi/.com if anyone has converted anything similar. Also see: http://www.msruns.com/viewforum.php?f=96
In particular:
1) I don’t know enough about the optispark to comment,
2) MegaSquirt is batch fire, until the router board is released, at least,
3) MegaSquirt can run high or low impedance injectors (PWM is used for current limiting with low impedance injectors),
4) You can use either a wide band EGO sensor/controller or a narrow band sensor for EGO feedback control.
Your best bet is to read the FAQ and the manual. The FAQ is here: http://www.megamanual.com/ and the manual is here: http://www.megamanual.com/v22manual/mtabcon.htm
In general, MegaSquirt is not designed to be a ‘no hassle’ solution. Instead it is intended to be an educational process. As a result, a large amount of reading and study is required.
We do not sell direct, please contact the distributors to find out costs, etc: http://www.megamanual.com/v22manual/mintro.htm#group
Lance.
Jon,
There are a large number of considerations, options, and independent hardware paths that may suit you, but only you know your wants, needs, and abilities. As well, MegaSquirt is a ‘universal’ ECU, and it is up to the user to sort out the details for their vehicle. Others may be able to provide some help on your vehicle, try the forums at www.msefi.com for application specific advice.
You have two main choices to make:
- MS-I versus MS-II processor, and
- V2.2 versus V3 main boards.
Each have their advantages, which you can read about in the documentation.
Whether you can tune it yourself depends on your skills, experience, and ability to read instructions, see: http://www.megamanual.com/ms2/tune.htm
For your specific application, it is not 'officially' supported. However, it may be possible to use it. Ask on the forums at www.msefi/.com if anyone has converted anything similar. Also see: http://www.msruns.com/viewforum.php?f=96
In particular:
1) I don’t know enough about the optispark to comment,
2) MegaSquirt is batch fire, until the router board is released, at least,
3) MegaSquirt can run high or low impedance injectors (PWM is used for current limiting with low impedance injectors),
4) You can use either a wide band EGO sensor/controller or a narrow band sensor for EGO feedback control.
Your best bet is to read the FAQ and the manual. The FAQ is here: http://www.megamanual.com/ and the manual is here: http://www.megamanual.com/v22manual/mtabcon.htm
In general, MegaSquirt is not designed to be a ‘no hassle’ solution. Instead it is intended to be an educational process. As a result, a large amount of reading and study is required.
We do not sell direct, please contact the distributors to find out costs, etc: http://www.megamanual.com/v22manual/mintro.htm#group
Lance.
Registered User
Joined: Aug 2001
Posts: 874
From: Carlisle, PA
If this sounds stupid...I'll apologize in advance because I just started reading about the megasquirt.
What would really be smooth is if there was a way to take the optispark and us it as your crank reference...ie...dissassemble and put a wheel with the VR sensor in the existing housing so that it is one sealed unit and away from debri.
Only problem is the the cam turns at twice the speed of the crank and I'm not sure how you could compensate for that. Maybe it is possible to change the code to allow for this.
What would really be smooth is if there was a way to take the optispark and us it as your crank reference...ie...dissassemble and put a wheel with the VR sensor in the existing housing so that it is one sealed unit and away from debri.
Only problem is the the cam turns at twice the speed of the crank and I'm not sure how you could compensate for that. Maybe it is possible to change the code to allow for this.
Thread Starter
Registered User
Joined: Mar 2002
Posts: 2,743
From: Baton Rouge, LA, USA
No one has been able to make the MS work off the regular opti low res output because the slots are un-evenly spaced. The high res won't work either because the frequency is too high. I know someone, though, that made it work off an OBD2 crank pos sensor that came stock on the '96/'97's.
Registered User
Joined: Feb 2002
Posts: 5,645
From: Bridgewater, MA
No one has been able to make the MS work off the regular opti low res output because the slots are un-evenly spaced. The high res won't work either because the frequency is too high. I know someone, though, that made it work off an OBD2 crank pos sensor that came stock on the '96/'97's.
You should figure it out then make a nice little package deal Mike.
Registered User
Joined: Jun 2002
Posts: 109
From: West Plains, MO
triggering on the low resolution should be possible. You can set up Megasquirt to trigger on the Rising Edge or Falling Edge.
The slots for the low resolution all START at a equal distance from each other, but end different. This is used so the PCM can identify position of #1, these motors (94+) are sequential injection, and do not have a cam shaft sensor typically used on sequential setups.
That brings me to another question. The 1992-1993 LT1 was Bank to Bank fire, not sequential, so did this distributor have the different length slots on the low resolution signal, or all equal.
I have spoken to someone who was trying to get it to trigger on rising edge of the low resolution signal, I need to look back and see if he was successful.
The slots for the low resolution all START at a equal distance from each other, but end different. This is used so the PCM can identify position of #1, these motors (94+) are sequential injection, and do not have a cam shaft sensor typically used on sequential setups.
That brings me to another question. The 1992-1993 LT1 was Bank to Bank fire, not sequential, so did this distributor have the different length slots on the low resolution signal, or all equal.
I have spoken to someone who was trying to get it to trigger on rising edge of the low resolution signal, I need to look back and see if he was successful.
Thread Starter
Registered User
Joined: Mar 2002
Posts: 2,743
From: Baton Rouge, LA, USA
According to Will, someone tried using the low-res signal, even built a signal modifier, and still couldn't make it work. From looking at the tuning software, I think you need either 1 pulse per cylinder firing (8 on the cam) or a toothed wheel with one missing tooth. Neither the low-res and high-res match these requirements.
This why I suggested leaving the ignition timing controlled by the stocker in the original post. It seems to get 2 orders of magnitude more complicated when you try to control the ignition with MSII, and the stocker does a pretty good job on its own here.
This why I suggested leaving the ignition timing controlled by the stocker in the original post. It seems to get 2 orders of magnitude more complicated when you try to control the ignition with MSII, and the stocker does a pretty good job on its own here.
Thread Starter
Registered User
Joined: Mar 2002
Posts: 2,743
From: Baton Rouge, LA, USA
The problem is you still need a way to trigger MSII. We're just trying to figure out how to do it using the stock hardware.
Registered User
Joined: Aug 2001
Posts: 874
From: Carlisle, PA
Just so I understand where the end of this trip is.
You're hoping to use this system to you're advantage in a forced induction setup, right. As part of this you will get realtime tuning and 2.5 bar speed density to make your forced induction setup easier to tune.
The stock ECU will run all other sensors including the spark timing.
This system seems to have a lot of nice features and a good way to hook up a electronic race accessories.
Seems like it could also take the place of the impedance converters.
I just wish I was more up to speed on a lot of the technical info.
I get way over my head in the MS forums but it is interesting
You're hoping to use this system to you're advantage in a forced induction setup, right. As part of this you will get realtime tuning and 2.5 bar speed density to make your forced induction setup easier to tune.
The stock ECU will run all other sensors including the spark timing.
This system seems to have a lot of nice features and a good way to hook up a electronic race accessories.
Seems like it could also take the place of the impedance converters.
I just wish I was more up to speed on a lot of the technical info.
I get way over my head in the MS forums but it is interesting
Thread Starter
Registered User
Joined: Mar 2002
Posts: 2,743
From: Baton Rouge, LA, USA
Crap, the plot thickens. . .
You guys know Craig moates, right? (moates.net) He's the one that pioneered real-time tuning on GM ECM's. Well, he lives down the road from me, and I hooked him up with a good deal on an LT1 car. . . which means that real-time tuning on the LT1 probably isn't far away. Hmmm.
Mike
You guys know Craig moates, right? (moates.net) He's the one that pioneered real-time tuning on GM ECM's. Well, he lives down the road from me, and I hooked him up with a good deal on an LT1 car. . . which means that real-time tuning on the LT1 probably isn't far away. Hmmm.
Mike
Registered User
Joined: May 2000
Posts: 2,889
From: Peachtree City, GA
Crap, the plot thickens. . .
You guys know Craig moates, right? (moates.net) He's the one that pioneered real-time tuning on GM ECM's. Well, he lives down the road from me, and I hooked him up with a good deal on an LT1 car. . . which means that real-time tuning on the LT1 probably isn't far away. Hmmm.
Mike
You guys know Craig moates, right? (moates.net) He's the one that pioneered real-time tuning on GM ECM's. Well, he lives down the road from me, and I hooked him up with a good deal on an LT1 car. . . which means that real-time tuning on the LT1 probably isn't far away. Hmmm.
Mike
umm that would be sooo AWSOME! eheh
Thread Starter
Registered User
Joined: Mar 2002
Posts: 2,743
From: Baton Rouge, LA, USA