99spec 4-channel ABS?
 

Anyone know anything about it? Advantage of a 4-channel (vs. our 3-channel) unit? Anyone switch over (which I'm guessing would require the pump, lines, and computer)?

~Ramy

I priced out some of the hardware for a customer - very, very expensive. Almost never comes up on yahoo either.

Yea I've found the ABS pump/unit a few times, but no ECU or lines. Wanna know if it's worthwhile or not...

umm what i dont understand whats 3 channel n 4 abs? i know abs is for the wheels

4 channel abs has a separate channel for each rear wheel. Currently, the ABS system can only respond to rear wheel lockup under braking by modulating pressure to both rear wheels in unison. With a 4 channel system, it can control each rear wheel independantly, allowing the wheel with traction to maintain braking system pressure and slow the car better.

In other words, 4 channel is better than 3.

In order to take advantage of this you would need dedicated feed line to each rear caliper correct? I don't see how this is useful if you are using a T'd brake feed.

Yes, you'd have to have two lines to the back.

In order to do this, I presume you'd need a new pump (one with 4 outputs), a new abs ecu, and probably a new harness too.

I don't think the gain is enough to justify the cost and pain in the ass to swap over to the 4 channel system.

Also the 99spec upgraded ABS is faster and behaves better then the stock ABS. Personally I used to keep mine off as it would kick in under hard braking for a turn. Which was very very bad. I've yet to play with the upgraded version but if you can get your hands on one give it a shot. It may be nice to have.

You would need to purchase a whole 4-channel pullout. Anyone have a guestimate as to the market value of a slightly used 4chnl abs system?

so this means if i have 99 fd i have 4 channel abs thing

Yes. Look on your ABS unit. If there are four lines on it (vs. the pre-99 ones that only have 3 lines coming off of it) then yours is a 4-channel unit ;)

~Ramy

ABS and braking hardware is different in 98-00 (version V) and different again in 00-02 (version VI). The last version is (obviously) the best - 16bit ecu and electronic brake distribution.

Any guesses on pricing?

PM Jimlab, iirc he has the 4 channel in his car

the pump alone was about US$800 (I'll dig out the exact price if your really interested, PM me). I haven't priced the rest of it because I simply don't know exactly what bits and pieces are required to get it all up and running.

Couldn't you just pull one off of another make say a vette which are plentiful?

DaiOni, would you mind getting the prices on the lines and the computer? Cuz the pumps do pop up used every now and then... it's the other parts that I can't find.

canadaisintexas, would ya mind askin Jimlab about it? Him and I aren't exactly on speaking terms, so he wouldn't reply if I asked him ;)

Thanks
~Ramy

if you can identify all the bits needed (inc numbers) - I'll do the pricing.

:rofl: If you can provide a 99spec+ full parts catalogue, I'll provide the part numbers :p:

put it this way, identify what you can from 13bpower, and I'll see what I can do about the rest.

LOL. God.... one of these days I'm gonna manage to get ahold of that catalogue. You'll see ;)

its not worth the time/$$$... spend it elsewhere my friend :)

To each his own ;)

Why do you think I haven't bought another RX-7 yet. I wish you would hurry the hell up! :fawk:

:rofl: I'm workin on it... EVERYTHING'S possible. It's only a matter of time & patience...