if anyone is interested in picking up the extra abs computer and abs pump - let me know.

i will not be installing the lines any time soon but there was a site pointed out Neil
http://www.fedhillusa.com/

 

From what I've seen, there's been three different types of wheel speed sensor, with just minor detail difference in the molding where the wire goes into the sensor itself...think S8 have the white collar at entry from memory. They all seem to test the same resistance wise and interchange freely, if they were the ebay ones, probably doing OK anyway, go for around $Au300 each down here new, eek!

If you come across a 95LHD rear harness might save a bit of labour, should already have the Bosch plug as that was equivalent to Japanese Version III on, which had the earlier ABS ECU change. Pump connections might require more thought though.

 

wow, i picked mine up for about that - pretty costly but the payoff is going to be huge!

Negative there mate, the 88-pin (3 row) Bosch plug didn't show up until 1999 for all cars. I think the older style has a pin count of 55 and the newer one is about 88 pins.

however there are still the same number of wires used plus 3 extras. swap has been easy. i wont be running the hard lines for a very long time however so i can't road test it. it'll either "lock" or it wont.

 

99+ brake booster is 20% smaller in size and needs more "hand power" to operate.At least thats what i experienced when i installed it.The only noticable difference with all the other parts being 93's is 10% less pad knockback effect...

 

interesting - i did not notice any size difference at all.

 

so pedal effort is increased with the newer one? This would make sense as they also dialed back the power steering 20% in 99+ (supposedly) which I'd also like to replicate. I wonder if they touched the clutch pedal force at all? I would think so as the newer cars were putting down 280. We need a parts manual to cross reference part numbers, that will answer all of these questions. I want a FULL 99 spec conversion lol

 

Me too!! I cant wait to profit of your hardwork.

 

Peculiar, given the number of vacant terminals in the old plug. Had a look at what I think are the "new" sensors too...all black - no chrome ring, ones with the white reinforcement are S7.

There's no change in the clutch hydraulics over the entire run. Gomez has linked to a slave that reduces pedal effort (going the other way!) from one of the Japanese aftermarket companies elsewhere. Any brake place worth their salt, could accomplish the same pretty easily, if there was that desire.

 

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/99-servo-differences-pics-inside-526534/

 

yes i see... wouldn't have thought to even compare the differences.
good info - thanks for posting the link to that!

 

I haz your parts manuals - well actually Japan has them currently but they're being sent to me very soon. I bought the entire FD manuals collection from '92 on up (this includes the parts guide for those models).

 

Old vs. New

 

Nice

 

Finished - managed to figure out where all the wires go and what they're used for.
Was a pain as some of the wires might start out as white but would turn into a different color & gage (22awg to 20awg or even 18awg).

ABS Pump / 10pin
ABS Computer / 88Pin
ABS Wheel Sensors / 4 * 2Pin
Diagnostics Port
etc

I'll be wiring one up in the car shortly - it'll be months before I am able to go out and test the ABS unit but I can at least wire it in.

Attached a photo showing what my wife allowed me to do with the spare sitting room Laid out is a 2001 RX-7 RS body harness, dash harness & interior-rear harness.

 

Holy crap!!! and THATS why i was afraid to ever start on this lol. My hat comes off for all your hard work... this looks like medusa ! GREAT JOB!

 

If you have the patience to make a how-to guide or do this for a price, I promise you will have some interest!

 

Thats where I'm headed next - I'll probably have that guide finished soon.
still have some parts left over too;

 

The ABS Computer *might be* reflashable. It has two MC68HC11E9 processors on-board.

I have the adapter boards for programmer but I have no idea what I'd want to do to it or what changes I'd like to make.

However, would be nice to be able to open the valves and bleed the ABS unit on command! :-)

 

Haha damn, you are way smarter than I am when it comes to all those fancy computer thinkin boxes! Really glad to see some one take this on

 

i may have missed it but, what is the advantage to doing this?

 

Good question.. Here is what Mazda said about the 2000 GF-FD3S


Four-channel, four-sensor ABS - This is the best scheme. There is a speed sensor on all four wheels and a separate valve for all four wheels. With this setup, the controller monitors each wheel individually to make sure it is achieving maximum braking force without locking the wheel(s).

Three-channel, three-sensor ABS - This scheme, commonly found on pickup trucks with four-wheel ABS, has a speed sensor and a valve for each of the front wheels, with one valve and one sensor for both rear wheels. The speed sensor for the rear wheels is located in the rear axle. This system provides individual control of the front wheels, so they can both achieve maximum braking force. The rear wheels, however, are monitored together; they both have to start to lock up before the ABS will activate on the rear. With this system, it is possible that one of the rear wheels will lock during a stop, reducing brake effectiveness.


In other words, you can drive/corner the car harder without spinning out because the ABS computer able to pay attention to each wheel.

 

Earlier FD RX-7's used Three-channel, four-sensor ABS .. so each wheel was individually monitored but if either back wheel starteed to lock up bracks were released on both wheels.

 

Here are some photos I took while disassembling the ABS computer and pump.

Computer



ABS Assembly

 

...more

 

Wheel sensors measured in resistance

rear: 1.6ohm
front: 1.04ohm

I have other sets I could test but for the moment this is what I've decided to post up.