Temporarily Disable VSS?

[Nito]

^

Hi Dave,

If you're referring to putting the rear sensors on the front, sure it'll prevent any traction control kicking in and allow the rear to spin up, but this isn't where I'm coming from. It would be nice for a bit more slip but I don't want it to spin up and high side.

Doing the above wouldn't change the 'stability' side involving automatic application of braking or a situation where one wheel is off the ground and so the two fronts are spinning at different speeds again causing application of brakes and cutting of power anyway. Imho, automatic braking is fundamentally wrong and I've had the same issue with cars that feature stability systems. It's great for people who bimble about and are scared of lifting a wheel accidentally, but terrible for owners who do push things a bit further. If you are pressing on its not safe to have VSS take over, because it can react both unexpectedly and inappropriately. I'd like the ability to switch off stability but retain ABS and traction control in differing degrees.

As it stands I'll just have to learn to ride around it. It's not a massive deal in the grand scheme of things and the bikes are great fun anyway, but in the search for continuous improvement it's one of the few things I've noticed that I really don't feel comfortable with (in 350 miles of ownership anyway) and never have on cars in the past. I fitted an override switch to my old Subaru H6 Legacy Outback because the Vehicle Dynamics Control was terrible and the car was infinitely better without it, far more predictable/consistent when pressing on and ironically more stable! The other thing I've noticed is under hard braking (tested a couple of times to see how it'll react in an emergency) the bike doesn't seem to pull up squarely, it seems to pull to one side. I'll need to monitor this, might be down to everything still bedding in.

Cheers
Nito

 

[Nito]

Napper, what do you mean by "wheel left"? {edit...do you mean wheel lift?}

On my Subaru I rigged up a switch that could set the system up to turn off VDC and ABS, or, disable the VDC and retain ABS. I believe Subaru also use a Bosch system so might try employing the same technique on mine to try it out.

I've also read elsewhere of Nissan owners fitting a switch to the Yaw Rate sensor power or earth, to disable the signal of the yaw rate sensor that apparently had the effect of disabling VDC and EBD but retaining ABS.

I'm not worried about traction control, I'm sure that could be overcome easily enough by modifying the signal from the rear vehicle speed sensor but don't see a need for that, no point spinning rubber away unnecessarily.

Looked at the schematics today for the VCM (Vehicle Control Module). The main signals it receives are from the;
SAS Steering Angle Sensor
YRS Yaw Rate Sensor
VSS1 and 2 Front wheel vehicle Speed Sensors
VSS3 rear wheel vehicle speed sensor
PRS Pillion Rider Switch which alters the parameters (good idea when pillion on board allows less tom foolery)

Outputs are basically; application of brakes to any of the wheels or reduction of torque.

These are pretty much all the sensors which have a bearing on how the VSS reacts. Messing with the speed sensors will no doubt affect the DPS as would the SAS. So perhaps the YRS is where it's at or fooling the system into a fault condition as with the Subaru trick above but then restoring part of the signal which brings the ABS back but in the Subaru's case, leaves the VDC light on but disabled, which is how I ran 100% of the time.

Cheers
Nito

 

[bigc1500]

Im also interested is disabling this function can anyone please help

 

[Wildrice]

This subject may have been beat to death but I haven't found an optimal solution yet. :doorag:

I'm seeking a way to temporarily disable the "throttle kill" feature of the VSS when cornering at low speeds or making a sharp turn from a stop. I get embarrassed when I'm only going 10 MPH and the engine sputters when attempting to accelerate out of a turn. pps:

Modifications I've already made to help avoid VSS engagement:

• Set shock dampers to 5.
• Set front tire pressure to 18 PSI and rear tire to 28 PSI.
• Considering a stiffer sway bar.

To temporarily disable VSS (low speeds only), I'm considering:

1. Add a switch to temporarily override the rear sensor signal with the front sensor signal. This appears to be a solution others have tried with success. No negative DPS or ABS effects.
2. Reduce steering angle feedback to the ECU, thus delaying VSS engagement.
3. Close the parking brake sensor circuit (without actually engaging the parking brake). Not sure what this will do, if anything.
4. Close the brake pedal sensor circuit (without actually engaging the brakes) to keep the ECU in ABS-only mode. This looks promising and very simple to implement if it works.

For the record, I'm NOT looking to burn donuts in the street. I simply want to accelerate out of a reasonable turn without the engine cutting out. :thumbup:

For example, you can easily disable the "throttle kill" feature (DTSC) of the stability control system in an AWD Volvo with the press of a button. It still engages the braking system (with YAW sensor input) to keep everything under control but allows power slides. In fact, the only time I leave DTSC on anymore is in the rain or other adverse conditions.

I have an early 2015 F3's with Stage 2 upgrade from Monster Fuel Injection & I don't believe I've ever had the Nanny kick in--before or after the upgrade. I do push the F3's quite often--in turns & on the freeway--top speed with Stage 1 upgrade was 118 mph prior to traffic slow down--haven't had the opportunity for top speed run with Stage 2 upgrade but it sure makes a major difference in low speed acceleration. Handles great in sharp turns--SwayBar & Elka Shocks.