For anyone that's interested I just ordered all of the parts for the Megasquirter. I will build it and see how she works.

One thing that is bath good and bad is that it doesn't incorporate any ignition control into the ECM. I think it is good because it will simplify the install and also my current CDI ignition is doing its job well (permatune). The only downside is that I don't have computer controlled advance.

I am kind of working on parallel systems, the megasquirt and a GM based ECM. The GM ecm I am going to use is a 1227730 which is commonly found in 90 and up Camaros. This is a TPI MAP system that will require several EPROM mods and lots of tuning. Some mods include deactivation of the VATS and VSS. It is a batch fired ECM which uses a 4 wire ignition module that I am fairly certain will be compatible with the signal form the stock dizzy.

If anyone is interested I have the full pinout diagram for this ECM, and a few of the other part numbers that will be associated with the setup.

Both systems of course still require the design of an intake manifold. At the moment I am going to go the cheapest route which is to modify the CIS runners and get ahold of an old blown airbox to cut up. I am planning to drill out the existing injector holes and have a set of premade injector bosses welded in place. This should cut down on some of the fab time involved.

I am hoping to be under $200 for each setup. This is assuming I can make both setups use the same set of sensors. I will have a slightly higher cost with the GM setup because of the need for a EPROM programmer/eraser.

Ben in SC

I have the same question concerning the squirt system. Went to the site and saw no item numbers or prices or ordering info. Very interested in this type of simple setup. I would rather run a stand alone fuel system on a turbocharged or supercharged arrangement.

James/Rarly,

I am in on the kit group buy, $100 delivered. I also have my local industrial electronics dealer ordering the part for me as well. I will then make the double sided PCM myself, hopefully in a month they will have the host software updated so that I can updload/update the ECM Flash without any special hardware/software.

I will let you guys know what I find out on the individual parts cost.

Ben in SC

Sounds good, I'd like to find out a lot more about this system.
Thanks for the info.

Any news on this front? Has anyone tried out the Megasquirt system or the ignition system they are developing?

They seem to have a lot of people not paying after the group buy setups, but they never respond to my inquiries about taking someone's place.

Any progress on the GM EFI front?

Curious,

Anyone?

I think it is going to take a long time before we see the megasquirt hardware. They are way behind schedule.

There is a GM EFI update and website posted, check it out.

Well it has been a while, but my MegaSquirt hardware did finally show up. I have built the unit and fully tested it. I am now just waiting on delivery of my other FI bits like the intake, injectors, TPS etc......

I have attached some pictures of my completed MS unit fo your viewing pleasure :D......

http://www.pelicanparts.com/ultimate.../DSC00022x.JPG

http://www.pelicanparts.com/ultimate.../DSC00023x.JPG

http://www.pelicanparts.com/ultimate.../DSC00025x.JPG

http://www.pelicanparts.com/ultimate.../DSC00026x.JPG

And the Stimulator board....

http://www.pelicanparts.com/ultimate.../DSC00021x.JPG

Hopefully it wont be to long now... I have generated the necessary VE tables for the 3.0 SC engine and done preliminary configurations on the MS, I "should" be able to at least get the engine to run when it is first installed. From that point it is fine tuning with the O2 meter...

Maybe we can bring this thread back to life a bit now......

That looks great. Out of my soldering league...

They told me there may be another group buy this summer, as the last one is completely closed, apparently.

Keep us posted.

Olivier

I haven't received my megasquirt ECU yet. I think I'm at the end of mailing list.

I am not ready for it anyway. I am still working on the air box and fuel rails. Here is a pic of one custom made fuel rail. The square is 3/4" aluminium square. I machined three fuel injector fittings to match my ford mustang fuel injectors (Bosch). All the pieces are aluminium and have been brazed together.

Looking very good Tony!!!! I am impressed with your fabrication ability.

A note to everyone concerning the MegaSquirt and CDI ignition...

I have not been able to as of yet to find a suitible source for the ignition input to the MS. What it is expecting to see is an "active high" signal. That is, a signal that is normally at zero volts and pulses high during an ignition event. The signal produced by the TACH lead is at 14 volts normally and drops to 7 volts during an ignition event. It never goes low enough to turn off the opto isolator in the MS, something that probably occurs around 3 or 4 volts. Thus the MegaSquirt never sees the ignition signal.

Without this signal the unit doesnt know when to fire the injectors or obviously calculate the engines RPM.

I had hoped to not have to go with a MSD ignition but it is looking like I may have to. If anyone sees any errors in my above statements please POINT THEM OUT....

I will contiue to hack away to keep my EFI project on track.

Ben,

I haven't had time to look into how the MS unit will be hooked up yet. However if the signal at the tach is like you describe 14v->7v->14v etc.. then one could do the following.

On the stock MS unit one side of the LED in the opto isolator is connected to ground and the other goes to "coil" via a 330 Ohm resistor. The side marked "coil" could be connected to the battery (14v) and the other end (now connected to ground) would go to the tach. Now when the tach goes to 14v no current would flow in the LED since both side are at the same voltage. When the tach goes to 7v current would flow from the battery to the tach.

A couple of points of caution. I don't know what the tach input circuit looks like and with the above modification we are asking it to sink some current. Also one needs to check the datasheet of the opto coupler to see how much current is needed for it to turn "on". The 330 Ohm resistor may need to change.

The above is just of the top of my head. There maybe an easier/safer way of doing it.

UPDATE....

I was able to get the MS to work with my Permatune CDI ignition. What I had to do is change the 330ohm restistor out for a 4.7k and add in a 9.1v Zener Diode on the cathode of the Opto Isolator. The 4.7k resistor is needed to get back down to 10ma....

The signal coming out of the TACH lead is 50v which sinks to ground. I was able to talk with the chief engineer at Permatune to get the details on the box.

http://www.andersoncountysc.org/CDI_wave.jpg

I also finaly got my Carerra Intake manifold last week, I need to unbold the CIS stuff and bolt in the new intake, find a TPS that will bolt up to the TB and is resistive.

Back to work for me.............

James,
I got an internal server error when I tried to post on the sign-up page. I sent Al an email. Hope that will work.
Thanks for the update.

Mifintifin

82 SC Coupe
83 SC Cab

Ben (or anybody),

I just got my MS kit too - can't wait to experiment.

Questions;
1. How did/what did you use to generate the first cut VE tables?

2. Air temp sensor I understand - where are you going to put the coolant sensor?

3. Are you firing injectors batch or ping-pong?

4. What TPS sensor are you using and where?

I'm planning to go the route of gutting a pair of Zeniths to use at t-bodies (add TPS). I'm going to put injector bosses in a stock/Motormeister manifolds (CIS injector targeting). Atop my Zeniths will be intercooler(s) being force fed by 2 small(ish) turbos.

I plan to document when I get to it.

SmileWavy

Matt,


I used the torque curve table from the bently to extrapolate? the VE table... LOL that sounds cool!!

But really, I can email you the VE table that I am using if you or anyone else MSing wants it.... Better repley here as my email is DOWN, I hate working late to fix stuff!! Especially MicroSoft Stuff!

I've just updated my web page with pictures of my fuel rail and how I added a TPS sensor the existing Porsche throttle body.

http://www.geocities.com/tbitz/cis_to_efi.html

Here is a pic of the Porsche throttle body with the TPS sensor mounted:

Ben - you can e-mail me at mjdunl@roushind.com - THANKS!

tbiz - you're updates are too cool! Great job. The lathe does look like it comes in very handy. The Mustang TPS does seem like one of the simpler one's to use. You can get a lot of adjustment range out of those by simply elongating the slot. Or, in the aftermarket, there are some adjustment plates that can be added under the TPS to increase it's range.

Can't wait to get to my version - need to rebuild the engine first though.



SmileWavy

In addition to the Megasquirt system that seems so popular, I stumbled on another system that looks like it might be more complete.

http://www.sdsefi.com/specific.html

Regards,

Joe

And alot more expensive..............