EFI and Two-Strokes

[Webb]

jb24 at chrysler.com wrote:
> 
> Hello group,
>  I thought you might be interested in my project.  I am attempting to
> turbocharge small single-cylinder two-strokes (125 and 250cc dirt bike
> engines) for land-speed record attempts and the heck of it.  I am a
> veteran of Formula SAE, and can't bring myself to carburate anything.
> My only experience is with Haltech and Electromotive controllers,
> neither of which really have what I need.  My desire is to use a Bosch
> MAF, the late-model non-wire type to compensate for all the flow
> variability and misfire.  The problem is I can't get ignition and
> injection at the rpm's I am interested in with a MAF-based controller
> with a channel to control a wastegate solenoid.  I got steered here by
> Paul VanValkenburg's article in Racecar Engineering, hoping to find
> hardware that I could program.  Any suggestions?

Greetings...

My project is to fuel inject a snowmobile type 2 stroke engine, to
improve reliability.

All of the commercial 2 strokes I have come across that are fuel
injected use a simple RPM vs Throttle position map, modified by an
atmospheric pressure sensor placed away from the intake stream.

As far as hardware to program- a company called Injection Research
Specialists used to sell a retrofit kit to fuel inject snowmobiles and
jet skis in the 500cc range, but they are no longer around. A few kits
are still available, complete with software for changing the map from
Western Power Sports in Boise Idaho (I don't have a number handy -
information works).

Good luck - RTW 

The kit has nothing to drive a waste gate though...