Me and Ken (MuyThaiBoxer) just finished installing a MegaSquirt ECU (With the 025k firmware) outfitted with his new code to control trailing ignition.

We are using the stock leading coil, stock CAS, and stock trailing coil. It works perfectly! The only problem I see as of right now is that at below about 600RPM, the trailing coil shuts off. Also, you cannot ever set negitive split (doh!).

This was installed on my 1990 RX-7 NA Convertable. We are going to install another in another S5 Turbo II owned by eage8 on the forum, in the neer future.

Ken biulds MegaSquirts and prepares them for RX-7s with the modifications they need to run our ignition and BAC valve. The MegaSquirt on my car has a circut he biult to control the VDI and AUX ports. Don't bother asking Ken to biuld your MegaSquirt right now, because he is in the middle of doing R&D on the version 3 MegaSquirt board.

I'd post pictures, but my laptop is dead, and I'm using a Ken's computer to post this.

For more information on the MegaSquirt EFI, head to MSEFI.com

 

Awesome! Keep us posted.

 

A little more info:

The trailing coils shutting off below 600 rpm is because below that the triggers have too much time between them and the part of the code that controls ignition at revs that low has no provision for trailing.

Negative split isn't possible because implementing it would require us to use the injector PWM timer for trailing spark instead... which would keep people from using low-z injectors. In my opinion it is more important to support low-z injectors than it is to support negative split.

Oh, the thread on the megasquirt forum with all the collected rotary ignition info is:

http://www.msefi.com/viewtopic.php?t...er=asc&start=0

Oh, almost forgot, I also put in code to control a 3rd gen rx7's leading and trailing ignition... and have tested that on the oscilloscope... I believe 13Beast REW will be testing that on his FD when he gets a chance to come pick up his megasquirt from me.

Ken

 

How much???


-Ted

 

^ Indeed, how many greenstamps?

 

Depends on which board you want.

V2.2 board:



This can be had for around $140 for a kit. Add ~$20-30 of extra circuits for conditioning the CAS signal and outputting to the ignitors and BAC valve and other extras (VDI, aux ports).

I was building pre-modded ones for ~$320 a pop, but I'm all out and won't be buying any more.

V3 board:



This has the following things above the 2.2 board:

1) perry MOV on +12v input. Basically a surge protector
2) poly-fuses (resettable fuses)
3) built-in flyback protection and over-current protection on the injector drivers. Much better for low-z injectors
4) built-in VR sensor conditioner. (I'd add the second conditioner in the proto area if I end up pre-building these).
5) built on a 4-layer board... power and logic grounds are on separate ground planes.
6) built in coil driver... although rx7 owners wouldn't need it.

The cost of one of these kits is $180-190 if you want to build it yourself. I don't know yet what people are charging for pre-built kits, but it's going to be significantly more than the 2.2 board because it takes quite a bit longer to build. I *may* pre-mod and sell some of these when/if I get done writing rx8 ignition code... I'm thinking for about $400-420, but not anytime soon.

 

Um, what wer you guys talking about?

 

i'm always confused about megasquirt..
but i want to run it!

 

Not much to be confused about, it's an ECU, it controls spark and fuel :p

You can build it yourself or buy it pre-built. then you have to do the wiring work and you can tune it yourself or, again, buy it pre-tuned (I wouldnt reccomend that, it's easy to tune yourself)

But if you arent electronics savvy or car savvy I would reccomend you save yourself the trouble and pay somone else to do it :p

 

so Tofuball are you getting the true +12* trailing split on the trailing coils at/above 600 RPM???

Or is this the same piggyback that was being used before (with the trailing firing the same time as the leading)???

 

And have you used the 4 layer board yet???

 

I was waiting for this announcement. Congratulations and a big thank you to everyone who put all the time and effort into getting this to work. Now we have a standalone with (basically) all the options of a Haltech, Microtech, etc. at less than half the price.

 

Don't be all too quick to say that! I've gotten a microtech for less than half the price of the megasquirt!

 

so we actually need a megasquirt section now.

 

I've been helping with his install... IT's a true trailing split. The split can be mapped using a 6x6 split table. Leading advance is a 12x12 table... all tables have movable MAP and RPM bins.

The split can be adjusted between 0 and 20 degrees, or turned off at certain points in the map by entering a split of 21 or higher.

 

I assume you're referring to the v3 board.

Tofuball's car is using the v2.2 board, but I have a v3 board built and populated (see the pics above).

There's no reason why this shouldn't work with the v3 board, but as of right now I don't think anyone's tried.

(in fact, I think tofuball's car is the only one running fully stock leading and trailing on the megasquirt... his car is the test car for this stuff after all)

 

cool, thanks...

 

fyi, the thread over at msefi that talks about all the rotary stuff is here:

http://www.msefi.com/viewtopic.php?t=7544

 

And don't forget, we now have a Megasquirt forum over in the EMS area...

 

Yeh, I might put MegaSquirt on my GXL too, cuz I cant figure out for the life of me what is wrong with the stipid thing :p

 

haha you didn't tell me about your thoughts on megasquirting the gxl.

I can't come out to the garage this week but I can next week. If you still don't have it figured out by then, I'll see if I can make anything of it.

 

yeah, I am thinking of a plug in version as I have a half dozen ECU's laying around... so use and old N332 as the case, plugs, and then to the stock wiring, with the Mega squirt inside.

But I wasn't aware that the trailing coil timing issue had been resolved until this thread.

 

Damn...you don't see deals like that every day. If you come across another, you let me know!

 

Yeah, the original trailing code was written by the author of msns-extra, and it had a few bugs (low split would cause misses on trailing, and quick acceleration would cause misses on trailing at low revs)....

I took over from there and fixed the bugs, and tested on my oscilloscope (a lot of testing), and then Saturday, tofuball and I wired up the trailing stuff and got it working on his car....

I'd like to find a source of old broken ECU's for 2nd gen rx7's so I can build megasquirts into the stock ecu cases, and sell them as plug-n-play units. Do you know of a good place (other than the junk yard) to get these things cheap?

Also, I'm going to work on a complete how-to on how to wire up all the mods to the megasquirt to get it working with the rx7.

I have a pic of one of my modded megasquirts in the megasquirt section of the ECU forum.

Ken

 

Check with Rick from Indy parts. I have been getting other parts from him. He seems to be recycling the most Fc parts right now. PM me if you need his email address