Installing an F3 89 tooth rear sprocket on my ST - does it work??

[gmctech]

Verified... THIS DOES NOT WORK

I can verify that while the rear sprocket and belt from the 89 toothed F3 fit the spyder without any problems; this upgrade as of now will not work. I did the swap on my friends 2015 RT LTD and it was a cinch... 1 hour 28 mins to do it, but it throws a plethora of codes such as P0730 ( incorrect gear ratio). The local BRP shop worked hard for the owner of the bike and spent many hours over a whole week trying everything such as programming the F3 info into the RT's computer but to no avail... We have one last avenue to explore and thats through a BRP engineer who works with the snowmobile division who has ties with a person we know that races sleds and helps test BRP products that are in development stages.

 

[jcthorne]

On the F3, there is a setting in BUDS to allow use of either rear sprocket. So far I have not seen that option available on RTs.

Without the correct calibration, its not going to work.

 

[Bob Denman]

It only makes sense that the F3 can run either sprocket: it already does! :thumbup:
We just need to get BRP to see the logic in offering the "sprocket option" in the RT also... :dontknow:

 

[larryd]

Just my thoughts...I would think there is a tone wheel somewhere that is counting pulses per wheel speed...When this 89 tooth sprocket change was made to the RT the ECM is seeing to many pulses per revolution of the rear sprocket??? If there was a way to have that tone wheel send the same count after the sprocket change the ECM wouldn't know the difference???

I half understand how these things work, but I'm NOT smart enough to know what to do to make it happen...:banghead:

larryd

 

[Bob Denman]

It's taking it's reading from the ABS equipment on the rear wheel. :thumbup:

 

[larryd]

I can verify that while the rear sprocket and belt from the 89 toothed F3 fit the spyder without any problems; this upgrade as of now will not work. I did the swap on my friends 2015 RT LTD and it was a cinch... 1 hour 28 mins to do it, but it throws a plethora of codes such as P0730 ( incorrect gear ratio). The local BRP shop worked hard for the owner of the bike and spent many hours over a whole week trying everything such as programming the F3 info into the RT's computer but to no avail... We have one last avenue to explore and thats through a BRP engineer who works with the snowmobile division who has ties with a person we know that races sleds and helps test BRP products that are in development stages.

gmctech, Did you ever get this conversion to work??? Its winter time here in PA and I'd love to get this done to my RT over the winter...You can PM or e-mail me @ [email protected]

THANK YOU, larryd

 

[Spyd_Piper]

I can verify that while the rear sprocket and belt from the 89 toothed F3 fit the spyder without any problems; this upgrade as of now will not work. I did the swap on my friends 2015 RT LTD and it was a cinch... 1 hour 28 mins to do it, but it throws a plethora of codes such as P0730 ( incorrect gear ratio). The local BRP shop worked hard for the owner of the bike and spent many hours over a whole week trying everything such as programming the F3 info into the RT's computer but to no avail... We have one last avenue to explore and thats through a BRP engineer who works with the snowmobile division who has ties with a person we know that races sleds and helps test BRP products that are in development stages.

Revisiting an old thread.

This can now be made to work. (simple programming change - no, not by dealer or BUDS)

 

[larryd]

Revisiting an old thread.

This can now be made to work. (simple programming change - no, not by dealer or BUDS)

I'm VERY interested in doing this to my 2014 RTS...PLEASE tell me more...THANK YOU, larryd

 

[gmctech]

Revisiting an old thread.

This can now be made to work. (simple programming change - no, not by dealer or BUDS)

Yup.... We just had the ECM fiddled with and now it works perfectly. also had the police style quick start function programmed in

 

[larryd]

THANK YOU gmctech

Yup.... We just had the ECM fiddled with and now it works perfectly. also had the police style quick start function programmed in

I am getting ready to order the parts to go this route with my 14 RTS...

THANK YOU gmctech for this UPDATE...

 

[blacklightning]

This post is getting very interesting. I would love to have had the 89 tooth rear on my 2012 RSS. It would be like when the 80's model fox body mustangs were switching from the 2.73 and 3.08 gearing to something like a 3.73 or 4.10. It would really wake up that 225 hp 5.0 engine. Good luck with your changes, and report how things work out:thumbup:.

 

[gmctech]

This post is getting very interesting. I would love to have had the 89 tooth rear on my 2012 RSS. It would be like when the 80's model fox body mustangs were switching from the 2.73 and 3.08 gearing to something like a 3.73 or 4.10. It would really wake up that 225 hp 5.0 engine. Good luck with your changes, and report how things work out:thumbup:.

Thus far with minimum drive time on this upgrade it's been sold as a rock. It definitely livened it up as I'm a big guy and it wouldn't even come close to breaking loose on a WOT start before with me riding it and now it'll pull off hard then blister the tire like a MoFo.... Higher top end was programmed in along with 600RPM more pull. The icing on the cake for my buddy is the quick start feature like the police bikes have.. turn the key on and you can instantly start it and take off (I always hated that nanny bull-s.h.i.t. CanAm programmed in to this bike with that stupid safety screen). The safety screen still requires you to hit the button to clear it but it no longer inhibits immediate start and take off. As soon as the weather gets better we will be taking my radar gun out along with and identical bone stock RT Limited and doing some trap speed & time tests to really verify if this battle was worth the headaches and cost.