700 cfi question-ecm/electronics

Why not just put the 700 ECU into the 800 ECU chassis?

However, if you have a pipe, new can, and a high compression head, then perhaps the 800 ECU's increased fueling for the larger engine will benefit the 700 with those modfications?

Good luck with your swap out.

I guess I missed what size engine was in the '08 chassis.

Drewd said:

Why not just put the 700 ECU into the 800 ECU chassis?

However, if you have a pipe, new can, and a high compression head, then perhaps the 800 ECU's increased fueling for the larger engine will benefit the 700 with those modfications?

Good luck with your swap out.

Click to expand...

If it is a 700 going into an 800 chassis, you would need to use the ECU and injectors out of the 700 for sure. The 800 would way overfuel most likely. If they are both 700s then you would have to check with dealer to see if the mapping was the same for both years, then it would not matter which electronics you use as long as the injector color matches the ECU flash.

As for the voltage regulator, unless they have been replaced with the latest one (updated part number) I would be nervous as the older ones can take out the ECU when they quit working... google search for the updated VR part number, or check it in an online OEM parts site such as Kurts Polaris or Babbits. There were lots of posts here on snowest giving all the various part numbers (I think there were 3 or 4) but the search here stinks, but google is good for finding that info even on snowest... do NOT use a VR from SPI, even though they are cheaper, they will take out your VR too...

If fuel injectors are the same color you don't need to swap any electronics If they aren't, swap the associated ECU to the new chassis.