Megasquirt
 

Hiya,

Is anyone here using the Megasquirt EFI system on their A/C motor ? It looks like a cool system ... you build it yourself and it is all 'open source' and the price is right for the 'do it yourselfer' :D

I've read up on the system ... it offers everything I am looking for right now, and it looks like people are working on integrating ignition control for the future.

Anyone have any thoughts on this ? This is the last piece of the puzzle for my T4 EFI Turbo project.

Sandeep

Is there a web site for the EFI system.

I might be interested.........

Thanx..
Brendan....

Please post a link to megasquirt if there is one I got to see what all the buzz is for this EFI system thou I'm not liken the build it yourself part anyway I highly praise the SDS EFI system It is the best I've seen but more expensive I'm gonna guess however you don't need a laptop to program it it's all built in!! Here 's a link to SDS site SDS EFI link

Check it out ...

http://www.bgsoflex.com/megasquirt.html

Sandeep

I've been collecting parts to build a system for my 3.0 porsche. So far I have a ford mustang throttle body and racing injectors, pretty much just need the controller and a few sensors. It's been done a few times on 911's so far, and there is a link to someone who used it on their t4 bus on the megasquirt website. Used most of the stock injection.

I'd like to build a system for my GL vert, but getting intakes to work with a 911 or any other upright t4 cooling shroud will be the hard part.

That's the question I'm having, throttle body or port injection with a custom plenum. What do the 911 guys do for FI?

Nick

The 911's aren't hard because they already have CIS systems from 74 and up. Just a matter of yanking all the old CIS stuff off the intakes and making adaptors for the fuel injectors, build some fuel rails, and bold a throttle body on the intake.

Might be able to use the intakes off a 911 on a t4 if you could build an adaptor to get rid of the angle from the intake ports, probably cheaper to start from scratch though.

http://forums.pelicanparts.com/showt...0&pagenumber=6

Great information.

I'm using dual CB 48mm TB's to go with my turbo system. I'll have to plumb the turbo and ducting before I buy the MS kit and hopefully I can build something to work with my 911 shroud.

Sandeep

I just received all the parts to build the megasquirt controller, simulator, viewer and the relay board for a 2270 turbo I’m building. So with in the next couple of weeks I’m hoping to get it put together. There are a couple other sites I frequent where this subject has come up quite often in the last month or so just do a search for megasquirt and have a look.

http://forums.pelicanparts.com/searc...by=&sortorder=


http://shoptalkforums.com/search.php?mode=results

there is also another site called www.dune-buggy.com with a few people that are running megasquirt one guy has built 3 so far 1 in a buggy 1 on a 350 chevy and the third is going on a tpi chevy motor. Also take a look here for info on plenum design and injector sizing.

http://www.dune-buggy.com/turbo/index.htm

I've been planning in this direction for a while, I want to run a megasquirt injection system with a supercharger (from a toyota 4agze) on my type 4 powered beetle.

I just need to sell my carbs to buy the SC.

I like that you its already equipt to handle boost.

Thanks for starting this thread, I finally got off my duff and ordered my parts to build the ecu.

What type of carburetors.???

I need a set of dual carbs for my car.
Let me know.
Brendan....

I'm putting one on my type 3. I'm going to use mostly type 3 and 4 FI parts.

My intake manifolds are a combination of stock type 3 end castings grafted to stock carb manifolds. (cut the runners off the fi setup, and the bottom of the carb manifold) This gives me a good mounting for the injectors.

Going to use the stock pdsit carbs as throttlebodies. The system will look like a stock carb system with injectors.

I've got the ecu built, and will start working on the wire harness.

Where are you guys going to mount the ECU?

Brendan,

What type of carbs are you looking for ?
I have a set for sale that came off a bus (TIV), complete with linkage.

Rob.

OK, If I want to use dual carbs for throttle bodies can I remove the venturies to get better air flow.??? A weber 40mm idf has a 40mm butterfly with a smaller 28mm to 36mm venturie for example, am I correct.? Since I wouldn't have to worry about vaccum with fuel injection. Let me know what you think. :)

FYI,

There is a couple of megasquirt boards on EBay right now ...

http://cgi.ebay.com/ebaymotors/ws/eB...category=33553

http://cgi.ebay.com/ebaymotors/ws/eB...category=33553

Unfortunately, I still have to get my fenders painted :( so can't bid right now.

Sandeep

Where's the rest of it ?? SDS 4 LIFE !!!

it uses a GM map sosnor and o2 sensor, you can use whatever you want for injectors, and I think any other parts are GM as well.

pick s up rpm same as a tach

yes sds might be better, but you'll pay 5x as much for it.

The shinny one looks nice, but I don’t have $300 invested in the parts I bought, which were the controller, simulator, relay board and the viewer. They are not hard to assemble, I’ve got the simulator, relay and the viewer together in about 4 hrs (minus the parts I can’t find locally) and this is the first time wielding a soldering iron. My current problem is deciding on an intake design plenum or just a T pipe.

That sounds great. I hope to be ordering my kit in the next few weeks. I think the toughest part is going to be routing 2 new fuel lines from the tank to the engine. I'm planning on running it with the carbs and do the work (Installing sensors ect) during the summer.

After that, hopefully I can take one weekend to swap over to the TB's and plug in the harness and tune.

Sandeep

There are several working MS systems on 914's, go ask over on the 914club.com

The one thing with a turbo is that MS is FI only, no programmable ignition w/retard.
You can get Mega-jolt, which uses ford ignition components, but I don't know if that ties into the MS system or is stand-alone. If it does tie into the MS you need a 2 bar MAP to activate the ignition retard. Yes you could modify a stock dizzy to retard under boost. I think Mega-jolt is about the same price as the mega-squirt.

The fuel line ? depends on what you plan to do with the bug. Just street or AX? For just street all you need is a T at the tank, for AX you should have a surge ring or tank, FI hates sucking air in the twisties.

On the injectors there is a bit more to it than running whatever you want. If you run low impedance injectors without resistors you will burn stuff out. To big or to small will also cause headaches.

All of the MS systems that I know of, so far, did not run correctly without at least a couple of hours of dyno time. The SDS doesn't really need a dyno to tune, at least mine didn't. I'm saying this to make sure you compare apples to apples. Count the MS and Mega-jolt, a laptop, build time, wire harness, connectors plus a couple of hours dyno time and the savings are not quite as huge a some would lead you to believe.

The 2 main reasons I went with SDS is that #1 it has it's own controller so it doesn't matter if an OS is out of date and #2 for me time is money. It took a major amount of time just to plumb/wire the system let alone if I had to build it.

But if you do have the time it is a neat project and you will have a better understanding of how FI works.
Mark

Got a question.
I want to build a turbo FI engine and am a little confused about pressure regulators. If the stated adjustability range is 35 psi to 65 psi is that only for idle or is that it. Will the pressure rise over 65 psi with boost.

Also I was thinking of buying the CB-Performance dual throttle body manifolds with the injector boss's already in them. Does anybody know what brand of injectors will fit. The website says that they are type 1, 2, 4, 5 and 9 and that they will fit most GM fuel rails. Does that mean that they are the same style used by GM. If so What GM cars would have those injectors. I want to be able to save some money by buying some good used injectors. People are always taking off there near new stock parts for race parts so I want to pick up a set off ebay. :)

Points well taken.

I chose the MS system because I like to tinker :D and it should be a great learning experience. The OS ( programmed in assembler ) is the most basic machine instructions that a chip can execute. All software, regardless of the platform they were programmed on, has to be converted to machine instructions so the chip can understand them. No chance this will be obsolete anytime soon.

I'm going to be waiting for the ignition upgrade for MS (UltraMegaSquirt ?) before I actually plumb up the turbo.

Sandeep

Bosch injectors are the best, but a lot of guys like the suby (nippon?) injectors. Your pressure reg values are too high.

For all tech/FAQ questions see:
http://www.sdsefi.com/tech.html

Most of the info can be directly applied to the MS system.

My problem is more time than money which was one reason to go with megasquirt. besides I've been building this toy for a little over 3 years adding a couple months wont hurt :) A guy a work found this thought I'd share.
http://www.carcraft.com/techarticles/116_0403_mega/

I thout that most EFI systems ran around 45 psi of fuel pressure.

I will do some more research. :)

About 40psi. with hipo engines and turbo's you need more volume not pressure, that said the stock VW unit will work on all but the most extreme flat-4's.

I Understand the fact that volume is more important than pressure. There is nothing stock left in my engine plans. I was thinking of using some used dual carbs as throttle bodies and then buying the cbperformance dual throttle body manifolds with the injector boss's already in them. I have a whole bunch of RX-7 FI parts in my garage that I was planing on using. I can make my own fuel rails and use the mazda fuel pressure regulator witch is set at 41 psi. :) Turbo engine is a long ways away but I am definatley going to build an EFI system for my car. :)

getting everything together to supercharge and inject my engine.
I've lined up the supercharger but was hoping to find a deal on the megasquirt computer.

oh I have a set of Wber DCNF carbs that I'll have up for sale soon, with low rise manifolds $250 can. I'll also consider partial trades for stock type 4 fuel injection parts, need a manifold (complete) and injectors.

I have brought and built a megasquirt board, including the stimulator and relay board. I plan on using it on my type 4 motor, once I have built it and run it in on carbs...

I have a Manx buggy that has been running a complete CB Performance, turbo EFI kit and it runs well. I put together a Megasquirt ECU to replace the untunable CB performance ecu. The buggy runs, but getting the boost enrichment to work properly is a problem. There is so much written about the MegaSquirt, but not much written about tuning under boost. The MSTweek program is great with the exception of the fact that the instructions for using it (MSTweek) to tune the EFI are incomplete and have been for some time.
Jerry...

I have a MS system, with an Audi A4T TB, sensors and injectors, Modified Audi fuel rail, homemade plenum. It’s for a wasserboxer but the basic should be the same for an air-cooled..

I’ll keep you posted.. Jesper

Hello Jesper,
I like your aluminium fabricating skills! Nice Throttle body you have made.

What is the flow rate of the Audi A4Turbo injectors in [cc/min]? They are probably low impedance, are they?

Poor Oval...

Greetings,
Walter

Hehe! Thanks Wally, But I must admit that I only made the plenum sheets holding it in place with tape! And had a friend of mine welding it together,

The injectors are Bosch no. 208 150 447 which give 241cc. High imp. (12 ohms) With cut and welded Audi fuel rails, together with a 944 fuel pump it becomes a nice set up!

Jesper

Be carefulll with a turbo on a 2,1 ltr engine and 241cc injectors. They seem a little small sized for that. Forget where they came from or what the books say.
You don't want to lean out with a turbo...

Good luck,
Walter

Ahh, no I’m going to run it as a normal aspirated engine.. Not a turbo. Ported heads with 10.5:1 comp.
And W120 cam with Type-1 lifters.. So I think I am on the safe side!

Jesper

I see, yes, then I agree (boring but I do).

But why then not keep the stock plenum?

Greetings,
Walter

Two reasons, first the old plenum will only accept the wbx trottelbody, which it’s only 46mm and the A4 is 60mm…. In addition, I have made velocity stacks inside, where the stock just has four straight pipes going in, and it look cool!!

Jesper

Ok I was checkin out the megasquirt site. Can anybody really build it and tune it? Im pretty electronically challenged so I was just seeing how hard it was for the guys that did it.

It was pretty easy. You have to be able to solder, but thats easy with a little practice. Just make sure you have the instructions and have read them through a few times before you start.. Test as you go. The docs are pretty good for building it..