Anyone done an Aircooled EFI system?

Ronald T. Webb rwebb at ptialaska.net
Fri Nov 6 06:39:42 GMT 1998


Andy -

Wish I could be more help.

This was a kit I found at a snowmobile wrecker. A complete system to
upgrade a 570CC water cooled 2 stroke to EFI. I also have a cal program for
it that allows it to be tailored for other engines. It has dual throttle
bodies, with injectors built in, but since there is one TB per cylinder,
TBI vs TPI becomes a moot point.

I did a lot of work to try and find the company, but they apparently went
belly up around 1993.

The ECU is potted in a rubbery stuff, with an EPROM sticking out. I have no
idea on the processor (possible 6811?). I should really read the prom and
try to disassemble it...so many projects, so little time...

The company name is Injection Research Specialists (IRS) out of Colorado
Springs. Anybody know what happened to'em???


Ron Webb

andy quaas wrote:

> Tell me more about this snowmobile engine EFI!  What HP was it, was it
> port injection?  What ECM did you use?  Any idea what size the
> injector(s)/TBI are?
>
> Andy Q




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