S100 shift cut parameters
Posted: Tue Aug 14, 2018 2:44 pm
Hi All,
I'm struggling to undestand the definition of the shift cut start and end points when setting up the gear position sensor for good shifts.
On my previous system (Xoomshift), there was a +/- tolerance figure to enter and that was it. With the identical gear pot as being used now with the S100, I had this set at 25mV and it worked well with a very stable and repeatable voltage for each gear.
With the S100, I'm using 75mV start and 200mV end - which worked very well with the contactless pot on the busa engines I've setup.
Can someone explain in plain english what the two settings do as I can't understand the description in the manual!
(I had my first failed run of the season yesterday - and with Alex's help reviewing the logged data, the gear pot is the likely suspect. I had loads of false "Shif A" commands logged with each one retarding the ignition accordingly, and 250ms times in the "last 20 shifts" which is the time-out value for a gearchange. Of course, I wasn't trying to change gear...The car basically lost all power and I cruised into Top Ess marshals post.)
I've still to fully investigate the gear pot and test it out, but even if it's goosed and needs replaced, I still need to set up the start and end values to suit.
I've had the odd hicup throughtout the season and often the logging (only at 10Hz) does capture a spurious Shif A trigger so it does indeed look like the gear pot is on it's way out.
Looking through data from earlier in the year, the pot voltage varies by around 17mv but data from yesterday is showing a variation of up to 47mv so perhaps the mechanical interface between gear barrel and pot is slacking off with age.
I'll keep you posted on what I discover once I have the pot and mounting removed.
Cheers
Steve
I'm struggling to undestand the definition of the shift cut start and end points when setting up the gear position sensor for good shifts.
On my previous system (Xoomshift), there was a +/- tolerance figure to enter and that was it. With the identical gear pot as being used now with the S100, I had this set at 25mV and it worked well with a very stable and repeatable voltage for each gear.
With the S100, I'm using 75mV start and 200mV end - which worked very well with the contactless pot on the busa engines I've setup.
Can someone explain in plain english what the two settings do as I can't understand the description in the manual!
(I had my first failed run of the season yesterday - and with Alex's help reviewing the logged data, the gear pot is the likely suspect. I had loads of false "Shif A" commands logged with each one retarding the ignition accordingly, and 250ms times in the "last 20 shifts" which is the time-out value for a gearchange. Of course, I wasn't trying to change gear...The car basically lost all power and I cruised into Top Ess marshals post.)
I've still to fully investigate the gear pot and test it out, but even if it's goosed and needs replaced, I still need to set up the start and end values to suit.
I've had the odd hicup throughtout the season and often the logging (only at 10Hz) does capture a spurious Shif A trigger so it does indeed look like the gear pot is on it's way out.
Looking through data from earlier in the year, the pot voltage varies by around 17mv but data from yesterday is showing a variation of up to 47mv so perhaps the mechanical interface between gear barrel and pot is slacking off with age.
I'll keep you posted on what I discover once I have the pot and mounting removed.
Cheers
Steve