Megasquirt

[Rob]

Originally Posted by boygenius

What type of carburetors.???

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

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.

[boygenius]

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.

[Sandeep]

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

[bc1303s]

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

[Shadowbug]

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.

[ace007]

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.

[Sandeep]

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

[Mark the canuck]

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

[boygenius]

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.

[Sandeep]

Points well taken.

I chose the MS system because I like to tinker 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

[Mark the canuck]

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.

[ace007]

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/

[boygenius]

Originally Posted by Mark the canuck

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.

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

I will do some more research.

[Jerry D]

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...