I want to lower my rpm/mph or in other words increase my mph/rpm. I purchased the 79 tooth rear sprocket for my F3. This is the sprocket that is used on the non-North American F3 models. I also purchased the shorter belt. The dealer installed the rear sprocket and belt. When I picked it up and started driving it home the check engine message came on the gauges and it would not shift properly. Took it back to the dealer. After a week and half in the shop, the dealer was informed by BRP that the error code is due to the sprocket change. On the F3's with the semi automatic transmission, the down shift points are programmed into the ECM or the TCM. The dealer put the original 89 tooth sprocket and belt back on and the unit works fine. My question is, if they run the 79 tooth sprocket on the non-North American models, can I change the ECM or the TCM to a non-North American and get the proper down shift points needed for the transmission? It would seem to me if I can change the ECM or the TCM (which ever unit controls the downshift points) to match the 79 Tooth rear sprocket ratio, it should work. Any technical information about this would be great! BTW, all F3s use the same front 29 tooth sprocket.
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Rear Sproket Change
- Thread starter Mactim
- Start date
billybovine
Active member
This was brought up last year sometime. It has nothing to do with shift points. Someone contacted BRP at that time and asked if it could be done. It has to do with a mismatch between engine rpm and the expected rear wheel speed in that gear. So it does not matter if it is a SE or SM transmission. Because of that nobody tried it. So you are the first. At least we know it is true.
Colin
New member
A possible fix could be to get your dealer to plug in the BUDS, and see if your F3 has an option to set to international settings, if so once you change your sprocket and belt you can change it to the International setting, which will then have the same settings as
our F3 here in NZ and Australia, as the smaller sprocket and belt is our only option
bigwhammy
New member
I costed this for USA residents last year and cautioned re having to replace the modules.
i costed it about $2,700 us$.
you would have also needed to replace the belt guards.
I suppose it is a case of cutting losses or making the commitment.
if the dealer advised you that it could be done let them fix it.
i was informed by brp that bud would not work but maybe they are wrong.
will look at the programming area a bit closer.
Bob Denman
New member
Does the BUDS system read the V.I.N. of the attached bike, or is it input by the technician?
If it's the latter; I'd have them try punching in the V.I.N. of an RT, and see what happens...
If it's the latter; I'd have them try punching in the V.I.N. of an RT, and see what happens...
bigwhammy
New member
BOSSWeb BRPB.U.D.S
Hi the dealer can update the ECM.
The dealer should be able to try to change the vehicle configuration, eg select settings - vehicle configuration - country option to International model. The ecm may or may not accept the new data.The BUDS will most probably come up with a cluster coding does not a match with the ECM connected. They can try to just click yes.
An easier way would be to get a vehicle VIN and Engine number and customer name (a F3S with the 79 pulley) to download data from BOSSWeb using B.U.D.S. this is the easiest way to set it up. This may be the quickest way as they may not need to pair the ECM to the GBPS or do a TPS setting. They will then need to add your keys to the ECM.
The parts manual for F3 Se6 only has the one ECM so I would not waste money on a new one. ECM 420666716[TABLE="class: gv, width: 0"]
[TR="class: highlight"]
[TD="class: PartNumber"]Do you know what codes are coming up U0300, U0302,U0303,U0400P062F, P2806, P280A or maybe P062C
Good luck.[/TD]
[TD="class: Description"][/TD]
[/TR]
[/TABLE]
Hi the dealer can update the ECM.
The dealer should be able to try to change the vehicle configuration, eg select settings - vehicle configuration - country option to International model. The ecm may or may not accept the new data.The BUDS will most probably come up with a cluster coding does not a match with the ECM connected. They can try to just click yes.
An easier way would be to get a vehicle VIN and Engine number and customer name (a F3S with the 79 pulley) to download data from BOSSWeb using B.U.D.S. this is the easiest way to set it up. This may be the quickest way as they may not need to pair the ECM to the GBPS or do a TPS setting. They will then need to add your keys to the ECM.
The parts manual for F3 Se6 only has the one ECM so I would not waste money on a new one. ECM 420666716[TABLE="class: gv, width: 0"]
[TR="class: highlight"]
[TD="class: PartNumber"]Do you know what codes are coming up U0300, U0302,U0303,U0400P062F, P2806, P280A or maybe P062C
Good luck.[/TD]
[TD="class: Description"][/TD]
[/TR]
[/TABLE]
F-3 Pulley Change Successful!!!!!
I thought I would let everyone know that I completed my project of installing the 79 Tooth rear Pulley on my 2015 F3-S North American Model. I installed the new rear Pulley, used the BUDS system to uncheck the option for North American (CU) drive ratio. Then I had to reset the VCM Variant code. The model changed from F-3 Cu to F-3 International. No fault codes, shifts like it is suppose to. This leads me to believe that a F-3 with a 79 tooth could be changed to the 89 tooth North American Rear Pulley. This would provide more power out of the hole. Contact me if you want more info. I wanted lower RPM at Cruising speeds.
I thought I would let everyone know that I completed my project of installing the 79 Tooth rear Pulley on my 2015 F3-S North American Model. I installed the new rear Pulley, used the BUDS system to uncheck the option for North American (CU) drive ratio. Then I had to reset the VCM Variant code. The model changed from F-3 Cu to F-3 International. No fault codes, shifts like it is suppose to. This leads me to believe that a F-3 with a 79 tooth could be changed to the 89 tooth North American Rear Pulley. This would provide more power out of the hole. Contact me if you want more info. I wanted lower RPM at Cruising speeds.
billybovine
Active member
Fabulous. It's good to know it can be done. There have been some other threads on the this topic that made it appear that it could be done on a F3. Thanks for confirming it for us.
Thanks is for the update. I'd prefer lower RPMs while cruising as well. How much of a difference did it make in the RPMs?
Highwayman2013
New member
So it can be done.
It may not be that simple. Some ECMs can only be written to once in the basic config areas like changing international criteria, then that section of the data storage is "locked".
I'm not saying this IS how things are but they certainly could be. As there is only one ECM module that is fitted to the F3(-S) it may well be possible to rewrite all parameters but don't bank on it.
FIRECAT
Member
So lower RPM at cruising speed means better gas mileage do you see a difference will it be worth the money you spent on all this! My V-twin RSS is notorious for her at high rpm at cruising speed looking forward to the new three cylinder next time
Sent from my iPhone using Tapatalk
Sent from my iPhone using Tapatalk
Bob Denman
New member
:clap: :congrats: :firstplace: :2thumbs:
79 to 89 RT
I'm still waiting for someone to get the 1330 RT changed from the 79 to the 89 tooth rear sprocket...The RT's are heavier, usually ridden two up and many times pulling trailers...They would REALLY benefit from the lower gearing sprocket change...
There is one member on here working on getting a handle on this...If they get it figured out I'll be the second one doing it...
It would be nice if BRP would step up and offer a option for this...
larryd
I'm still waiting for someone to get the 1330 RT changed from the 79 to the 89 tooth rear sprocket...The RT's are heavier, usually ridden two up and many times pulling trailers...They would REALLY benefit from the lower gearing sprocket change...
There is one member on here working on getting a handle on this...If they get it figured out I'll be the second one doing it...
It would be nice if BRP would step up and offer a option for this...
larryd
Rear Pulley Change "NOT Successful"
My pulley change project looked very promising until I took it for a test drive. It did not like the drive ratio change. Check engine light came on, neutral indicator started flashing. Back to the drawing board. Changing the model to international did not work. Going to try and reflash the ecm. Sorry for the previous misinformation.
My pulley change project looked very promising until I took it for a test drive. It did not like the drive ratio change. Check engine light came on, neutral indicator started flashing. Back to the drawing board. Changing the model to international did not work. Going to try and reflash the ecm. Sorry for the previous misinformation.
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