zr580 efi - Snowmobile Forum: Your #1 Snowmobile Forum

strainjpnt · 09-10-2009, 04:44 PM

alright im new here
so here is what im wondering how does the zr580 motor run in the summer
does it adjust the fuel for temp
if it doesnt work well in summer what all is needed to convert to a carb setup
thanks

**RJ Gleason** · 09-10-2009, 05:01 PM

EFI adjusts for temp, elevation, and humidity.

strainjpnt · 09-10-2009, 06:52 PM

so i can run it in the summer no problem?

strainjpnt · 09-10-2009, 06:56 PM

and another question i have the motor but no fuel pump can i get by running a small car efi fuel pump with a regulator

**BC_Dan** · 09-10-2009, 08:49 PM

If it's set up right, it should run fine in the summer. If you do convert to carbs, you will need to replace the stator and flywheel, the carb engines use different parts.

Don't know about the fuel pump, but it seems reasonable; if the pump is supplying at similar pressures, I would think it would work the same as a stock pump... Putting sled engines into carts is always a bit of a challenge, EFI engines even more so.

There's a lot more to putting an efi engine in than a carb; you will need the computer (ecu), air temperature sensor, water temperature sensor, throttle position sensor, ignition timing sensor, injector timing sensor, barometric pressure sensor, appropriate color injectors with the appropriate color coded EPROM, and a wiring harness to make all those sensors talk to each other. That's probaby why you won't see many EFI engines in a swap of that nature... converting to carbs and rejetting as necessary will be a lot cheaper and easier...

JheLrey · 09-10-2009, 10:23 PM

I have a fuel pump for that sled, electric, by the way since it is EFI.

**kccats** · 09-12-2009, 04:48 PM

I got a pump for mine at Auto Zone! Yes they run fine at 80 deg! At bout 3500 they would need to be freshened!

**RJ Gleason** · 09-12-2009, 06:38 PM

I believe that the mitsubishi fuel pump is a direct replacement.

strainjpnt · 09-13-2009, 12:55 AM

i have every thing from the sled engine throttle bodys you name i took everything connected to the engine
except the fuel pump
so im guessing it will run fine btw what was the part number on that pump

**RJ Gleason** · 09-13-2009, 08:32 AM

That's because the fuel pump was in the gas tank. If you can get the tank, you should be in good shape.

strainjpnt · 09-13-2009, 06:08 PM

well i couldnt get the tank the person i bought it from needed it

JheLrey · 09-13-2009, 06:42 PM

I have a seat and tank also! They are attached as one

strainjpnt · 09-15-2009, 10:26 PM

still need help here
is the 580 efis fuel system one way or is it return style

**RJ Gleason** · 09-16-2009, 11:40 AM

It has a return line for the over pressure relief from the fuel rail.
You could fabricate a tank once you have the right pump.

strainjpnt · 09-16-2009, 03:20 PM

alright i got the original seat and tank for 50 turns out my freind didnt need it
going to pull the pump and assembly and mount 10 galllon fuel cell

strainjpnt · 09-17-2009, 08:55 PM

well my motor i got last week is blown up on the left side im rebuilding the whole motor
any tips or tricks or helpful insight for the process
would be great
also anyhting i should check for when im this far in

**RJ Gleason** · 09-18-2009, 11:33 AM

Just be sure that the base is free of all junk before reassembly.

strainjpnt · 09-18-2009, 05:15 PM

well i hit a snag i can not get the cylinders i dont want to pry on them but they wont budge.
and yes i tryed the rubber mallet

**RJ Gleason** · 09-18-2009, 06:03 PM

Did you remove the base nuts?
Then a rap with the mallet at the front (exhaust side) then from the back (carb side) with the piston at the bottom of the stroke should break it loose.