H12 ABS Swap
10-03-09, 09:09 PM
#26
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/
i will not be installing the lines any time soon but there was a site pointed out Neil
http://www.fedhillusa.com/
10-04-09, 12:57 AM
#27
Rotary Freak
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.
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.
10-04-09, 02:41 PM
#28
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!
Originally Posted by billyboy
If you come across a 95LHD rear harness might save a bit of labor, 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.
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.
10-06-09, 03:41 AM
#29
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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...
10-06-09, 02:31 PM
#31
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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
10-07-09, 12:27 AM
#33
Rotary Freak
Originally Posted by hwnd
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.
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.
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.
10-07-09, 02:45 AM
#34
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10-13-09, 12:14 AM
#39
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.
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.
Last edited by hwnd; 10-13-09 at 12:18 AM.
10-13-09, 12:32 AM
#40
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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.
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.
10-13-09, 06:48 PM
#43
Dual MC68HC11E9 Processor
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! :-)
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! :-)
10-13-09, 11:08 PM
#46
Good question.. Here is what Mazda said about the 2000 GF-FD3S
The improvements to the new RX-7 lineup, in general, include modifications to the brake and suspension systems to enhance driving performance and handling stability. The interior features an instrument panel with white meters, metal plated frame rings, and red illumination for a more sporty look. The reinforced side impact bars and ABS equipped with an EBD (electrically-controlled braking distribution) system for all four wheels enhance safety.
Improved Braking Performance
- The ABS control unit for all four wheels has been upgraded from the conventional 8 to 16 bits and equipped with an EBD (electrically controlled braking distribution) system. This results in shorter stopping distances when the brakes are applied suddenly and enhanced vehicle stability.
- The ABS control unit for all four wheels has been upgraded from the conventional 8 to 16 bits and equipped with an EBD (electrically controlled braking distribution) system. This results in shorter stopping distances when the brakes are applied suddenly and enhanced vehicle stability.
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 other words, 4 channel is better than 3.
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.
