EFI and the things that go with it

[ronnie]

So the engineer on my ship has a H1 and I was asking him what carbs he had on his bike yada yada.. I told him I was going to need new carbs since I'm using a bigger engine and boring it out on my 350f. We he told me to pretty much scrap the carb idea and get a throttle body off a late model bike that is as close to a 450cc as possible. He was telling me about this controller system called Megasquirt (i searched on here and i got 2 results, so I'm making its own thread)

Now, I priced throttle bodies and they are stupid cheap.. less than 100$ roughly. And the megasquirt is roughly 250$ assembled(you can get it cheaper if you want to put the circuit board together). The great part about it is that all the programs for PC and downloads are FREE. Its all open source. I havent read much on it yet but I will tom when I get on watch.

Here are the websites.. The first one is the actual megasquirt site. There you can find all the info on the system, how to's, and all the nitty gritty. The second one is the site where you can purchase the goods to get you going.

http://www.megasquirt.info/

http://www.diyautotune.com/catalog/index.php


My engineer explained it to me this way.. all you have to do, is hook the TB up to your bike, plug in the unit, put a O2 sensor on one of your exhaust pipes, and run your bike at idle. Hook your computer up, use the program on the PC to map the throttle, run the bike a little, map the throttle more.. Pretty much run it and tune it till its perfect. And the system can use temp sensors so i knows when your engine is cold starting, or put a gas sensor so it knows if your running E85 mixtures. And the best part is you dont have to worry about tuning your carbs and what not, just get on your bike and go like you would your car.


If anyone has had any experience or have dabbled in this feel free to share.. This is definitely a cheaper route than $800 CR carbs that I'll need later on..

Dabble away.

 

[scotch]

i duno a ton about it, but microsquirt is usually what's used by the guys doing smaller engines http://www.diyautotune.com/catalog/microsquirt-c-35.html.

megasquirt is usually used as stand-alone engine management on cars.

could always just do it the oldschool way and mess around with jets for a few hours.

 

[tweakedlogic]

your main obstacle is the charging system. It doesn't have enough amps to run the microsquirt alone, mush less the fuel pump and lights. I ran across a thread a long time ago where another guy wanted to do this. He installed a stator from a 600 honda ( I think). He machined a spacer for the stator cover for the extra depth. To my knowledge he hasn't finished it yet. I will try and dig up the link.

A well tuned carb will be cheaper and easier in the long run. FI is great, I've thought of doing it myself on my 360 for a turbo project. But it's uncharted territory on these small bikes. If you want to go ahead and try, the cbr1000 TB is really close. but you might have better luck from a 750 for velocity. You will have to either build a custom header or have a wide band O2 sensor for each pipe. The microsquirt is very high resolution, and needs to know what every cylinder is doing. A standard 4 into 1 won't cut it as the junction is too far away from the port. You will also need electronic ignition, custom 1 to 4 intake, find a place for the knock sensor, figure out the temp sensors, and wire the bitch.

There is no reason to spend $800 on carbs for your bike. how much bigger are you going? you most likely only need to spend time jetting. IF that's not enough for you, port and polish the throats, knife edge the butterflies, and cut front of the butterfly shaft. The 350F has pistons like eraser heads, any more than 1mm larger carbs is going to suck on the street. A pure race bike that operates in about a 2K RPM range might need bigger.

 

[crazypj]

Friend of mine put two pairs of TL1000 throttle bodies on his V-8 and used Mega-squirt to control things.
He's also using it on the Cadillac motor he's fitting in his 1970 Toyota 2 seater

 

[ronnie]

Yea tweak I was planning on putting a gull 4 to 4 TB from a 600 sized bike. I want to do it cause carbs are a pain in the ass for me. I font have a knack for it.. I'll look mote into the voltage and amp requirements. I have plenty time till o get there though. Thanks for the advice guys, I'll keep this thread posted as I learn more.

Sent from my Galaxy Nexus using Tapatalk 2

 

[Sonreir]

Like tweakedlogic was saying, the biggest hurdle is wattage. The fuel pump, especially, will almost double your power needs and that's before you take into account the ECU, sensors (wideband for each exhaust header, throttle position sensor, temp sensors), and even the injectors.

Count on having to triple the output on your stock charging system in order to get all the goodies to work.

Once all that has been handled though, EFI is pretty awesome stuff.

 

[tweakedlogic]

a 600 is twice the size of your bike. use two tbs and make a 2 to 4 intake. Using all 4 would be way too big. Like using 38mm slide carbs. There won't be enough velocity and it won't run.