Supra Stick V4 Speed Signal

[TurboStreetCar]

Hello all, i have installed my SSv4 tranny controller and i have been trying to find a suitable speed signal for it.

I have tried using the ECT output from the ABS sensor with not so good results. i have also tried the rear ABS sensor on the transmission with also not so good results.

It seems both signals work fine at low speed conditions but when i get up around 70-80+mph the signal quality gets degraded and causes the MPH reading to jump around eraticly.

The MPH reading will jump from 70-80 to 20-30 quickly, causing the converter to unlock and it to sometimes jump down to second gear, Good thing its on a one way sprag huh!

Anyway i was wondering what some of the other Supra stick users were using and how it was working for them.

Thanks,
Dan

 

[IJ.]

Solved as per PM

 

[gofastgeorge]

Ah, what ?

How was it solved ?
I am about to install mine, what do I need to know ???

 

[IJ.]

Using the ABS sensor freaks out the SSv4 due to the high resolution, a bud here borrowed my Speedo calibration box I'd used for my old AVCR to trim the signal down to something the SSv4 can use.

JayCar kit (company here in Australia) < link to the "kit"

 

[TurboStreetCar]

Yea me and Ian were discussing the issue and came to a solution.

The issue is the speed sensor in both the combination meter and the tranny are very low quality. Really only good for simple devices.

The abs sensor is of good quality but the tooth count is too high for the SSv4 to read at highway speeds much above 70-80mph.

The solution is a speedo recalibration box that can scale the frequency of the pulses down. So for every two pulse the abs sensor generates it will output one. This makes it easier for the SSv4 to use the signal and should remedy the issue.

EDIT: IJ beat me to it.

Anyone else have any issues with this or a workaround?

 

[gofastgeorge]

Hmm......
Car does not have ABS. :aigo:

Going to head dive into TSRM now to see how I get out of this one.

PS, thanks to both of you!
I hate stumbling acoss stuff like this during an install.

 

[TurboStreetCar]

Im sure you could install an abs sensor to the transmission, the toner ring is most likely installed either way.

 

[IJ.]

The normal non ABS sensor is a 2 tooth Reed switch that tends to "bounce", there's another 4 pulse Reed behind the Speedo that can be used but it's bouncy as well.

You could fit an ABS Hall sensor and remove some teeth from the Shutter while you have it apart.

I'm quite happy to source the JayCar kits and ship them if all the costs are covered as I have a store 5 minutes from here.

 

[TurboStreetCar]

Thanks Ian, your the man.

I know theres other people running the SSv4, anyone have any other fixes?

 

[gofastgeorge]

I knew I kept an old ABS tranny for some reason.........
Parts !!
I will pull it apart today !

Thanks again IJ !

 

[gofastgeorge]

Here is how I cut my signal frequency in half.
Cut off every other tooth (32 to 16).

 

[IJ.]

Probably be better with 8 George

 

[gofastgeorge]

No problem, it's only 6 bolts, and one snap-ring in....
I'll chop-off another 8 teeth tomorrow.

 

[IJ.]

Yep think 16 will still be outside it's range.

 

[gofastgeorge]

Hm.......

Just got this from Latent Solutions:
"actually the more pulses per revolution, the better...
Best regards,
Garrett"

So I will try what I have, and go from there.

 

[TurboStreetCar]

Nice Job Let us know the results!

 

[IJ.]

Hm.......

Just got this from Latent Solutions:
"actually the more pulses per revolution, the better...
Best regards,
Garrett"

So I will try what I have, and go from there.

Yep right up until the SSv4 gets confused and can't count that high