WarShrike

iTrader: (5)

Looking to see if anyone here has done this on their F-body?

I know we have two versions:
EBCM is non traction control and 3-channel
EBTCM is w/ traction control and 4-channel.

There's a chance I'm going to need to move to a 4-channel setup and just wanted to know if there were any major differences in the wiring harness requirements.

I'm working on a different rear axle setup, and the reluctor ring will not be inside the differential housing.

LopeyZ

iTrader: (2)

Yes you will have to move a couple pins around in the plug that locks onto the EBCM. I don't know that the body harness is the same though. Plus there the harness that plugs into the control module under your dash... it may not exist either.

01ssreda4

iTrader: (96)

Good luck finding the backing plates.

LopeyZ

iTrader: (2)

This statement got me thinking... why would you need a 4 channel setup if thats all you want to do?

Couldn't you simply run a single 4 channel axle with the reluctor wheel attached like factory. Then you would need a 4 channel harness if you don't extend yours and one 4 channel backing plate to attach the ABS sensor. This would be like an external 3 channel setup or 3 channel hybrid.

I have the harness and a set of backing plates if you want to try. You'll still need to find an ABS sensor though.

I converted from 4 channel to 3 channel so I understand what you are going through. The biggest struggle would be running the additional brake line for the 4 channel setup. I would avoid that kinda work at all cost if it was me and figure out how to make your 3 channel work for you.

01ssreda4

iTrader: (96)

Well the number of notches on a 3 vs 4 channel reluctor is way different. That's a good reason why it wouldn't work.

FirstYrLS1Z

iTrader: (4)

3 channel reluctor ring on carrier-106 teeth
4 channel reluctor ring on axle-47 teeth

LopeyZ

iTrader: (2)

Alright so that plan wouldn't work. But another option is to have a reluctor ring machined to mount on the yoke of your DS... after doing some math to figure the tooth count. You then build a bracket on the trans housing to mount your sensor. A buddy of mine did this 10 years ago on his car and it worked like a champ.

LopeyZ

iTrader: (2)

On second thought... shouldn't the axle ring have less teeth since it is a smaller diameter than the carrier? What matters is not the number of teeth but the frequency at which they are picked up by the ABS sensor or the gap between the teeth. If the carrier and axle ring had the same number of teeth, you would have larger gaps on the carrier than the axle.

I stand by my original idea. Who wants to test it?

FirstYrLS1Z

iTrader: (4)

You never stated what the vehicle was from the factory,3 channel ABS or 4 channel ABS/TC,but based on your original post,your car is a 3 channel.
A 3 channel system/computer is tuned to pick up 106 pulses per rear wheel tire rotation.
A 4 channel system/computer is tuned to pick up 47 pulses per rear wheel tire rotation.

I have yet to see on this forum a successful conversion from 3 channel to 4 channel,OR 4 channel to 3 channel.
For our little 10 bolts,using a 3 channel rear in a 4 channel car is accomplished by using the 4 channel axles and backing plates with that 3 channel rearend,thereby complying with the required 47 pulses for a 4 channel system

LopeyZ

iTrader: (2)

I converted to 3 channel from 4 channel successfully. Used a 3 channel rear, 3 channel EBCM and 3 channel throttle cable. Had to do some tricky brake line work otherwise it wasn't hard at all. Also swapped 1 wire around in the harness pigtail.

FirstYrLS1Z

iTrader: (4)

that's good to hear that you successfully converted from 4 channel to 3 channel by changing other 'stuff' too. Most just put in a different channel rear,connect a few wires and expect it to work.

got milk??

iTrader: (18)

Which wire did you end up moving around?

libertyforall1776

iTrader: (2)

Well my '02 RS has ASR traction control, but it is a 3-channel system, so it looks like there is another version you did not account for...