Anyone using EFI?

TomStark

I am just curious, has anyone converted their 2 stroke cart from carb to EFI? I am thinking about possibly doing that next spring. Should not be too tough. Tuning my take a little while, but should make cold weather operation a bit more reliable.
Tom

BGW

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GoBeau

Hi Tom, I just purchased a 2013 Club Car Precedent GAS model cart and of course it doesn't have the EFI option. I would love to know more on what the conversion to EFI would take in parts and labour. If you have more information on this since no one else has replied I would love to hear about the process and cost involved in this "make-over".

Thanks. Rick

TomStark

I am assuming that yours is a 4 stroke. Everything you need can be found at DIYautotune.com and junk yards. If you are handy with soldering printed boards, you can get a Megasquirt ECU for as little as $219 (there is one for $169 but uses a different board and is not desirable) and they go up to $569 for the kit. The low price being Megasquirt 1 the high being MS3. for a cart, MS1 would be fine. About $190 for a wide band O2, then you will need a regulator, probably around $60, a fuel pump maybe $140, then go to the junk yard and get all the other sensors and connectors you will need, and the fuel injector/s. Probably another $50 there from a junk yard. Then you need to hook up your laptop, plug in your constants, run it and fine tune it. Then figure a few extras, wire, and what not, so count on $700 if you can do it all yourself.
Tom

1989Marathon

You make it sound so simple. I can tell you it really isn't that simple, unless the EFI was designed specifically to work with that type of motor.

Neither the 2pg, nor the 3pg can move enough air to benefit from an EFI setup. They work very well with a stock carb, or a slightly larger carb. The 3pg can handle a bigger carb than the 2pg, because of the design of the fuel tract of the 2pg. EFI would work much better on a piston-port 2-stroke rather than a reed-cage motor.

I have designed an EFI system for my supercharged Vanguard motor out of necessity. It was fairly easy to design and program, but the tuning is the hardest part. If the fuel maps don't already exist for your motor setup, you have to create them. It can be a nightmare.

Before I would ever drop that kind of coin on a 2-stroke for a cart, I would switch over to 4-stroke transaxle and install a big block.

TomStark

I build efi units for cars that never had it. When you have the data, setting up a start point is not that hard. Then make a few passes and you can fine tune the tune up fairly easily. Efi is not real complicated, and is fairly easy. The more you do it the easier it is. Of course tuning for low et can take a bit, but to be up and driving, that is not much at all


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1989Marathon

You are absolutely correct. If you have the data, you can get the motor running and driving pretty easily. Getting it to perform how you want is an entirely different story.

When I did the initial startup of the motor with my EFI, I had to adjust one point in one of the 4 fuel maps to get it to idle correctly. That's because I could gather the data that told me what needed to be adjusted.
That was 1 point out of 1220 points in various fuel tables. I have since added an additional map with another 400 points.

There is a lot to overcome. Just being able to get the motor to idle. Getting the motor to supply the correct amount of fuel throughout the entire rpm range, under no load, to produce the desired air/fuel ratio. Being able to do that at various loads at various rpms. Being able to react to a throttle that is being snapped open, at different rpms/loads(acceleration enrichment). Being able to react to a throttle that is being snapped closed at various rpms/loads.
The list goes on...

TomStark

Well I have done this many times. You need to know the flow rate of you injectors, cylinder head flow data, cam numbers @ .050, then draw on past experience. Acell enrichment depends on injector location. I have yet to take more than an afternoon to set up a car where it will be fine for normal driving. Racing is a constant search for that extra .01 or so second.

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Cruise Master

When you're from the Metro Detroit area you're born with the auto industry in your blood. Your whole life revolves around the internal combustion engine. That might explain why some can view EFI as simple. Now tying shoes, that's could be another matter.

Just a 8 Mile and Gratiot kid. ;)

TomStark

I wear velcro shoes!

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1989Marathon

I say give it a go then. Let us know how it works out.
What you really should be doing is coming up with an affordable EFI for the Briggs Vanguard. We are looking at over $1000 for a system that works with the Vanguard. I think that is a ridiculous price. I have about $170 into my entire EFI system.