Yeah Baby. EFI 225!!!

The CFM ratings shouldn't matter wrt engine size, within reason. Compared to a carburetor, a throttle body will have high CFM ratings compared to engine size, and does not need high vacuum to function. The TB needs enough vacuum so that the MAP sensor works. A carb uses vacuum to do work (ie move the fuel around and move mechanical bits) while EFI relies on electricity to do the work. As long as you can get an injector size that will provide enough capacity but isn't so large that it's uncontrollable at idle, you should be fine.

 

I run 2 tanks main and rear, would I need 2 pumps,and timgr if cfm does not matter then the 650 projec or 750 powerject would be fine ? i mostly want to do this so it will run great at elevation.................. with carbs ..........on the Olds a 650,775 and 850 sure make a HUGE difference .but I know a different beast......................went to the powerjection site that unit is huge and I mean huge

 

The Powerjection guys, RetroTekSpeed are in Corona, that could be helpful.

 

Actually you would need some way to switch between the two tanks. EFI has a fuel return line to return excess fuel instead of filling a bowl. The preasure is controlled by a regulator that allows excess fuel to return to the tank.

In order to run two tanks you need to have a switch mechanism that shunts both the pickup and return lines between the two tanks. Otherwise you risk overfilling one tank with returned fuel.

As for preasure, TBI systems run about 13PSI. So you need a pump that can maintain at least that preassure even under WOT. I run a 24 PSI Holley Pump on my 258 with a GM TBI and MSII V.3 controller. It has never had a problem with fuel delivery.

 

The MS learing curve is steep but think of it this way. When you are done you will know every part of it. If something goes wrong you will be in a much better position to diagnose and fix the problem with out having to go to outside sources.

As for the cost estimate. I am on my 3rd computer. In total I may have $750 in the system including the fuel pump. I built all 3 computers from the components and can diagnose and repair the hardware if necassary. The ability to plug in a notebook and see what the computer is doing while the engine is running helps in tunning out problems and you can even log runs to help increase efficency and performance. It also helps to diagnose faulty sensors.

The only real problem I have is not being able to make the IAC work correctly. Otherwise I love it.

 

I was reading up on the Powerjection system and it has a version that doesn't use a return line. (I have no idea how well it works, and have no experiece with it, but I thought it was an interesting difference).

 

It may use a pump that is set to maintain a given pressure at all times.

 

The success story is me I have been at this for while and there is always something new coming along to learn about. And as Hudsonhawk has stated there is a steep learning curve but it is well worth it you learn so much but at times it can make your head hurt.
But my buddy Ryan/willys59cj5 and I can assure anyone that Megasquirt runs great on a 225 and we have another member here out in Colorado that I am helping out that is running MSII on his Commando.
I should say I can assure you it will run great as long as you are willing to put in the time reading,preparing and tuning to get it that way.
And MSIIextra can now run spark and timing on an oddfire but there is major learning curve to implement that but it is totally doable.

Hudsonwawk have you tried any off the newer MSIIextra codes they have done allot of work with IAC settings.And there was also something about resistor diodes ect. I dont remember that needed to be removed on some installs to ge the IAC to work properly, this was quite awhile ago.

 

I honestly think my IAC may be the problem. It is a JY part after all. I have set the jumpers they say is required on the MSII. Sometimes it works sometimes it don't. Its more a nussance then anything else. One of these days I will get around to fixing it.

I have never looked at the extra code. I just run fuel and have never thought of lokiong at it for IAC.

 

If I remember correctly, msbweiland got his running fine except at wot where it was a little rich. He didn't use the closed loop accessory. I bought a projection because of his success and I got the closed loop part too. I've had to stop for a while cause I got a new tub and I'm fitting it to all the non standard stuff hanging pedals, power steering, sm420 etc. but I should have that all done soon and will start again on the FI. I'll let you know how it goes. It's on a Holley V6 manifold and uses two fuel pumps per previous threads. One regular projection pump and one Holley red body pump so the regular one doesn't have to work so hard.

 

Hudsonhawk I have always had better luck with the extra code and I run fuel only as well the guys that work on that code really put allot of time into it to assure it works great and all the extra feature are allot of fun to play with as you learn what they do.

 

Right now I have my water proof mini-MS built and the 4.3 throttle body out in the garage, I have the harness that came with the tbi unit and all the sensors. I have $235 total in it. I will need to replace the o2 sensor and get a fuel pump, make an adapter for the intake. I think it is doable on about $450-$500. Learning curve can be steep but from what I have gotten from my friend Steve, very easily learned especially if your an IT guy that thrives on this crap. He will be my tuning guru and educator. To give you an idea of how good he is, he has the 1st (actually one of the 1st fuel injected 2 strokes period) MS fuel injected 2 stroke motorcyle, an RZ350 Yamaha. With several members here running this there should be several fuel maps to start with for the 225.

 

so should I jump on this?????????http://sandiego.craigslist.org/nsd/pts/1280733513.html

 

If its comes with the ecu and harness. YES.

Shoot rebuild the engine and swap it in as a unit.

 

On topic: I have a 4.3 TBI in my Jeepster, using the stock harness. I never hooked up the check engine light, out of sight out of mind.

off topic: The down side to living in the rust belt is... rust. The upside? Lots of 4.3's in the junkyard, a good one can be had for a couple hundred, and ecm's are about $40. My favorite local place would be less. I have a few spares in the garage. No problem buying a whole Astro or Safari for $300, but it won't have rocker panels or a floor.

 

only problem with that option is I'm in love with the tractor like exhaust note of the Dauntless.