traction sensor signal lost...

[stevieturbo]

TCS only needs 2 driven and 1 undriven

I only ever used FL and RL, RR.

On front of mine I adapted a Subaru front trigger ring. Had to remove some teeth as back then the DTA wouldnt accept 44 teeth, although it does now.

Rear I just use the disc bell bolts, 8 per revolution.

Other than my initial wiring fault, the sensors always worked no problem ( other than vibration breaking the plastic GT101 now and again )

If using the GT101, have it pass through a hole, better with a partial tube on it to fully support the sensor
Simply bolting through the plastic lug...it will break eventually.

Other option for the VR to digital is the yellow Vauxhall "relay" mentioned in another thread that performs this conversion.

[mefmotorsport]

Thanks Stevie,

I have been experimenting today with this, a guy in Belgium has found success using specific BMW dsc sensors and a comparator circuit to make the 5v square waves. I have it mocked up here on the desk and it seems to work well. I have the bmw sensor that he recommended and its the correct fitting for my rear hub, he says 48 pulses per rev on these (its in the back of the wheel bearing) he's got it working well on the car he runs, a 1 series like mine, Patrick Snijers drives it, they say the DTA T/C works extremely well.

The sensor requires 12v supply and a 115 ohm resistor to ground. The signal is taken across the 120 ohm resistor, it changes from 0.9v to 1.7v this is fed into an LM393 comparator chip and the output is 5V pulses which is perfect.

I'll see how it goes on the car, will just do front wheel first on speedo, hopefully it will fix the other problem I had with the gt101.

Martin



note: the sensor (represented by I1) is connected to +12V not ground as shown in the circuit above, top left. the power to the LM393 is +5v (Vdd)

[mefmotorsport]

Tested at the weekend with the above circuit but with slight mods:

Sensor to +5v (not 12V, saves extra 12V feed)
R2 changed to 7.5K (to get suitable new ref voltage on Vref of chip)
Pulses 48/rev (CONFIRMED in dta SWin)

Now working perfectly at any speed, never falters on X dash speedo.

I have now built up a quad input version to install all 4 wheels and get the traction control working on the DTA ecu.

[mefmotorsport]

Final working circuit for anyone interested:

[stevieturbo]

Is this still running the ABS in parallel with the DTA signal ?

[mefmotorsport]

No, not at all!