SideWinder track speed sensor funtion?

[morepower=morefun]

Anyone know more about the 9 ECU sensors? Trying to get to bottom of the track speed sensor function. Was told that the track speed sensor will assist in limiting track spin on "hole shot" or "launch" for a more controlled power delivery. I was told by Yamaha Sales rep today that the sensor does not communicate in that way what so ever, that there is no "traction control" or "power limiter" at launch. Can anyone give any insight on this? Why have it then? When I noticed no oxygen sensor in exhaust and commented, this same sales rep said "Oh its there... I'm just not sure where", so obviously that is why he is in sales....
Thanks for any help explaining.

 

[tapex_07]

When I noticed no oxygen sensor in exhaust and commented, this same sales rep said "Oh its there... I'm just not sure where", so obviously that is why he is in sales....

Wow.....

 

[Grimm]

Apart from the engine designers, it sounds like you are currently more knowledgeable about the Sidewinder than anyone at Yamaha. Looks like your gonna have to find the answers to your questions yourself. Your answers might have to wait, until you get your hands on one.

 

[GeFeldz]

The track speed sensor is very probably the same speed sensor that feeds your speedo, they've probably just tied it in to the ECU for some control function as well as to give data to the speedo. It even said track speed sensor (drive shaft) in the pdf about the engine package.

 

[Shagnos]

It would require two speed sensor inputs. By comparing those inputs is how traction control
functions. ie a car has speed sensors on every wheel. Just one will only give speed.

 

[morepower=morefun]

It would require two speed sensor inputs. By comparing those inputs is how traction control
functions. ie a car has speed sensors on every wheel. Just one will only give speed.

Yes, I agree. As with the street bike TCS, it works off the difference in speeds between front and rear wheel speed. My question arose when a Yamaha rep tried to explain that the Sidewinder will launch better (more controlled, less spin) than the Viper MPI Turbo kits due to the new 9 sensor ECU. My questions were "answered" that day by telling me that the speed, crank, TPS and boost sensors would tell the ECU to back off the power as the track spin increases through backing down the boost. This confused me a bit because I couldn't figure out how the ECU would know if the track was biting and just rotating or if it was actually losing traction with only the one driven shaft sensor. So now I'm left to believe that if there is truth to the claim of "more controlled, less spin at launch" then one would have to assume that the engine timing/fuel management mapping itself is designed to limit or deliver the power/boost more gradually than the Viper turbo mapping.

 

[tapex_07]

What about when you add studs or traction adders? Just thinking out loud..

 

[pdiddy]

Yamaha has it's own GPS satellite to compare track speed to vehicle speed on the Sidewinder. In the unlikely event a vehicle approaches from behind, a signal is sent to the SAC and it is destroyed. However, if a Ski-Doo is detected, there is a 300ms delay in case it self destructs (this was cost saving compromise).

 

[blueironranger]

Yes, I agree. As with the street bike TCS, it works off the difference in speeds between front and rear wheel speed. My question arose when a Yamaha rep tried to explain that the Sidewinder will launch better (more controlled, less spin) than the Viper MPI Turbo kits due to the new 9 sensor ECU. My questions were "answered" that day by telling me that the speed, crank, TPS and boost sensors would tell the ECU to back off the power as the track spin increases through backing down the boost. This confused me a bit because I couldn't figure out how the ECU would know if the track was biting and just rotating or if it was actually losing traction with only the one driven shaft sensor. So now I'm left to believe that if there is truth to the claim of "more controlled, less spin at launch" then one would have to assume that the engine timing/fuel management mapping itself is designed to limit or deliver the power/boost more gradually than the Viper turbo mapping.

My guess, based off how ECU's work, Is that there is a table that has set values for how fast the sled can accelerate and if the track speed indicates a speed above the preset line it cuts boost to regain traction. It might be a "gotcha" type hangup for future Highjackers or people adding more boost since it would be easier to accelerate the sled fast enough to push the system past that line. It would be sweet to have a TCS button to turn it on and off, I'd use the system on icy trails for sure, and OFF in the powder.

 

[Shagnos]

Is still needs something to compare. How else would it know the difference between track spin/speed and
actual vehicle speed/acceleration?

 

[Shagnos]

[QUOTE=" So now I'm left to believe that if there is truth to the claim of "more controlled, less spin at launch" then one would have to assume that the engine timing/fuel management mapping itself is designed to limit or deliver the power/boost more gradually than the Viper turbo mapping.[/QUOTE]

Exactly. Smoother more controlled power delivery not a actual traction control as we know it.

 

[Nytros rule]

My guess, based off how ECU's work, Is that there is a table that has set values for how fast the sled can accelerate and if the track speed indicates a speed above the preset line it cuts boost to regain traction. It might be a "gotcha" type hangup for future Highjackers or people adding more boost since it would be easier to accelerate the sled fast enough to push the system past that line. It would be sweet to have a TCS button to turn it on and off, I'd use the system on icy trails for sure, and OFF in the powder.

An ECU can not tell if you are on ice with no traction management/studs, loose snow, good setup trial or dirt, so building in a table or multiple tables is not plausible.
If there is actually some sort of traction control with a single drive you would need a second speed input, no un driven wheel so options are,radar gun, expensive or GPS, very expensive.

 

[ShootToThrill]

I gotta say it's the same as any eps sled. The ecu will know the ground (track speed) from the sensor, where it is on these yamacats I cant tell you. The most it may do is apply boost progressively as track (ground speed) is increased. Such as the eps sleds, the power steering is decreased as the speed increases. It is in no way a form of traction control.