I'm thinking about letting megasquirt controll my injectors.. Let the stock ECU control everything else...

749 is not a option in my case... and i don't want to switch to dfi cause i like my emmissions equipment

 

i guy ive been talking to online for years now has that on his chainsaw or lawnmower or somthing.... i remember he had it on some small yard/garden engine.....



seems neat... id run it on somthing like a VW bug.... but not a V8 camaro.. you have so many much better options...

 

not if your only using it to control fuel..

 

Give RBob or Grumpy a holler.

BW

 

It's actually pretty c00l.
A friend of mine is running it on his Porsche. It IS the4 ECm though. Controlls everything on the car. He hooks it up to his Laptop and changes things in windows like the DFI 7 setups do.
Too bad those devices are all 'home-made'.

 

why is that too bad?

I'd rather build it myself than punk out and buy a DFI setup

 

and id rather learn the much more flexible and controlable GM ECM system then punk out and build a stripped down version of the ECM.....



i guess its whatever you consider punking out to be..


and yes.. the GM computer could control just fuel... or just spark.... or pretty much anything you hook up to it.

 

My GM computer doesn't handle boost very well

so yes this is a better choice than replacing the whole thing with DFI

 

a swap to a TY/SY one will..... GM ECMs are cheap

or you could use your current one, and just loose some resolution...

or you could boost ref the fuel pressure....


there alot of solutions out there if you're willing to give a detailed explaination of the problem...

 

the 749 swap is not an option, I need something that can handel the high/low res opti signals (LT1)

I've got a 2 bar map sensor in the car now and It works but lets face it I'm tricking the computer into working.. Its got major DFCO issues which suck cause tunercat doesn't have it in the TDF. I've also got a issue with it soon being maxxed out (i'm at 9 right now and plan on pullying it very soon) and a 3 bar will make me loose too much resolution for my taste. Not only am I tricking the computer into the vaccum/boost signal but i'm also having to trick it in VE %.. in other words you can just enter 120% like you shoud be able to in a FI car.

A FMU... comon.. it works but not exactly the precision i'm looking for if you know what I mean.


I've car the car running on a 2 bar map sensor.. If i can get the damn decceleration fuel cut turned off it will be OK. Right now when you let off the gas (when rolling) the car goes to 4 degrees of timeing and cuts the injectors completely off.. I've never seen that happen on a 1 bar stock tune.

 

After helping a friend out with his Alfa Romeo 4 cyl with junkyard turbosystem and MegaSquirt I can only say that MS works pretty well. Quite easy to tune it for medium performance but it needs at least a wideband lambda for some better tuning.

I'm currently converting a Victor Jr intake to EFI and it'll use MegaSquirt. I'm also about to install turbo on the car.
http://www.itv.se/~a1003/turbo

Depending on how much time I can get in the garage this winter, we'll see how the project comes along.

The MegaSquirt box can be built to handle spark ALSO with just a few extra components, it's called MegaSquirtnSpark MSnS. It uses a BOSCH module (common on 4-bangers), but can also fire a GM HEI module. A side project is MegaSquirtnEDIS. Firmware and tuning software is available. More information can be found on different yahoogroups.

I don't say that using a GM computer is bad, but I REALLY like the idea of using something you've built yourself. BTW! The Alfa Romeo is a homemade race car and this summer it kicked some *** on a few roadracing events (it passed by some Porsches and one Ferrari). MegaSquirt works!

/Anders

 

cfabe is using it on his 350 stealthram motor
along with a ford edis and crank triger i belive

 

Dont us it!
It doesnt handle the ignion or spark!

Which is a very important feature. I'd never want to be without.

 

First maybe read the entire thread.

Second if he wanted theres the newer version that does.


On a side note..

rooster.. do you have room for a small diameter dizzy? I can't remember you do...

BW

 

yep tons of room..

 

no way an regular hei would fit a tpi manifold right?

 

I was going to use the stock comptuer for timeing..


I got my computer to accept a 2 bar sensor.. and i've finally got all the bugs out of it.. So i think i'm going to use the mega squirt on anthor project. (twin turbo factory carbbed fox)

 

Then how about boring a hole for a dizzy (ala John Millican) and use a 749 then. At that point, you can toss the opti..

The only bugga bo would be if you have a 4l60E. But even that could be swapped to a 700R4. (A pain in the butt, however it is an option). BW

 

i've already got a 700r4..

Have you seen the cowl clearance on the 4th gens..

I woudl have to pull the motor to get a distributor in

 

what about an electromotive crank trigger setup? or wont it bolt to the lt1 block?

 

Megasuqirt can control ignition in a number of ways. Needs a crankshaft position sensor and/or a camshaft position sensor. I'm running my megasquirt on a stealthrammed 350 using ford distributorless ignition parts. Works great. You can also use it with a distributor and a different crank trigger setup.

These pics are from the night I got it running. The wiring is pretty messy. You can see the coil packs mounted on each side of the plenum, the EDIS module mounted to the firewall, and a shot of the crank trigger setup we built using an escort sensor and a trigger wheel pattern cut into the crank pulley.

This stuff is pretty expirimental still, but anyone with some fabrication skills and some computer skills should be able to get it set up. The entire setup cost under $200, including the megasquirt, all the wiring, and all the ignition parts.

More information at the following yahoo groups: megasquirt, megajolt, megasquirtnspark.

 

awesome,

I plan on using it for fuel only, hopefully it will be a little simpler