M1 Traction Control : Using Rear Drive Speed vs Rear Wheel Speeds - Final Drive Ratio Setup?

Hi,

I'm working on setting up the Traction Control in the Motec M150 in my 1993 Mkiv Toyota Supra.

I have all 4 individual wheel speed inputs going into the M1, along with the Drive Sensor input, and I'm trying to figure out how to appropriately assign the Final Drive Ratio with my set up, and verify if I'm missing anything else in the setup.

The Wheel speed input wires are secondary wires crimped on top of the originals with open barrel terminals, to grab the signal wires going into the ABS ECU. I'm aware this is generally not really recommended, however, since the car is older and doesn't have a CAN Bus System, I couldn't find any other places to grab the wheel speed signals, even with the TRAC ECU Removed.

In the HPA Course,

It was mentioned that generally you'd typically set the final drive ratio of your wheel speed inputs to a 1.0

For the Drive Resource, you'd typically set your final drive of your differential here.

In my case, I have all 4 wheel speed inputs wired in, along with the Drive Sensor.

I don't really see a way to assign the Final Drive Ratio's for both of these independently, as it is nested under your designated Drive wheel, and everything else underneath of it.

Additionally,

Here's the rest of my Set up for context.

- Traction Mode : Drive Speed (Couldn't find Enable, Engine Speed is the only other option)

- Driver's Traction Switch Index : Assigned to OEM Trac Momentary Switch button and set up to Latching.

- Traction Engine Speed Limit Fuel Margin : -500 (Starting off with Fuel Cut prioritized first)

- Traction Aim Main & Traction Range has been set up with some Base line numbers, according to the course.

Each Traction Aim Main Slippage % has been assigned to a 4 position Rotary Switch Respectively.

I have attached a photo to illustrate what I mean with the Final Drive Ratio.

Thanks for looking into this.

- Samson

Enter the actual final drive ratio. The Wheelspeed and DriveSpeed are scaled to the RPM of either the wheel or drive shaft. Knowing the actual final drive ratio allows the M1 ECU to calculate the drive shaft or axle speed as required.

You're using JRR firmware, so you should contact them for support as the control is likely different

Okay,

I'll set it to the Differential's final drive for now, and I have fired off an Email to John Reed to verify on this setting.

I'll follow up once I get a response from him.

Thank you

Okay, I've got a response from John Reed.

John has explained in the JRR Firmware, the Engine Speed mode, is the same as the GPR traction control strategy.

This would be recommended with a Manual Trans car.

The Drive Speed mode was something he added mainly for applications with unmeasured drivetrain slip (autos, slipper clutches, etc).

He explained that this is more of a simplified TC because the GPR Strategy doesn't really handle it well, and it does PID Based cuts so it's similar to the older M800's TC Strategy.

For The Final Drive Ratio's Values - He just recommended to use the differential's ratio.

If everything is set up right, the Gear Estimate should be working correctly.