ABS/Antilock brakes - possible to retrofit? - Page 3

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  1. #21
    CelicaSupra.com Member ddd228's Avatar
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    Lots of these for sale.
    https://www.amazon.com/s?ie=UTF8&pag...ioning%20Valve
    The way I would calibrate one is on a slick road.
    Maybe snow.My front brakes lock up B-4 the rears do.

    Do the road race guys use these?
    Perhaps your front tyres are at fault.
    Thanks for the reply,Rob.
    Dave in Seattle. I keep LATE hours.Hidden Content
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  3. #22
    CelicaSupra.com Member Road Ripper's Avatar
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    14 year old rubber up front on a damp road, that's the reason for the lock-up. I've locked up the front tires during a panic stop in traffic before, thankfully on a straight highway. Dry road surface and it did smoke and make the tires screech, but no damage. On the same car years later (my 84) I had skinny snow tires on the back and stock 225's on the front, in the spring/summer on a dry highway and I almost locked the REAR tires during hard braking at speed. I felt the weight shift forward and the rear lifted up and drifted to the right ever so slowly. I was able to countersteer it and stay in control the whole time. I had slowed from 65mph to about 35mph to avoid a potential accident in front of me. I'm thinking the smaller contact patch of the skinny rear tires coupled with possibly half of a tank of gas is what caused it. I normally like to keep the gas tank full, especially when I used to drive it in the winter just for the extra weight in the rear. It does help the handling and braking.

    I think the mk3 Supra abs system would be the easiest to steal and swap over, if it doesn't incorporate traction control. Since you have a digital dash, you already have a speed sensor for the rear wheels built into the speedometer head. Analog gauge clusters also have a sensor just for the cruise control, so that may be used in those cars instead. Then it's just a case of getting tone wheels fitted to the backsides of the front hubs and mounting the sensors to the front knuckles, and running wiring. Weight of the car and different tire sizes shouldn't matter. I thought all the abs system does is look for a difference of signal compared to vehicle speed to see a locked wheel, then manipulate a bleed-off valve to unlock that wheel? At least in these early abs systems it works that way?
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  4. #23
    Whistles racerxj220's Avatar
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    How are you folks planning on installing wheel speed sensors on the front wheels?

    I'm trying to figure that one out. I want traction control. Rear wheel speed sensors are relatively easy. Just get a ring made to fit on the CV joint where the diff and axle meet. The rear subframe has plenty of room for sensors for both rear wheels.

    If you manage to find an easy solution that will work with the WilWood brake upgrade for the fronts, I'm in.

    Using driveshaft speed is one approach, but mainly for automatics. It may be the "easiest" way on these cars, but definitely not the most efficient.

    You'll need an engine management system that will be able to do it, too. ProEFI is one of them.
    Built 1JZ-GTE, PTE 6466, PGS Dog Box R-154, Pro-EFI 128, Nitrous, Flex Fuel, Headgames "R" cylinder head, SPF1 manifold, Hypertune, so much more...
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  6. #24
    CelicaSupra.com Member gamble's Avatar
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    Front/rear wheel speed for traction control shouldn't be too bad. Just a matter of adding a sensor near the bolts for the rotor to hat bolts, and sneak a magnet under one or a few of those bolts to make it read easier.

  7. #25
    Whistles racerxj220's Avatar
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    Curious, but would you just be using the bolts? I am not sure what kind of resolution that would give, but I guess it wouldn't matter as long as it's "something". I'll look into this more, tonight. Thanks again, Gamble.

  8. #26
    CelicaSupra.com Member gamble's Avatar
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    You are running pro efi right? Or am i thinking of someone else... Anyway, you can do traction control all sorts of ways, like if the rpm's are rising too fast.
    http://proefi.com/info/media/feature...ction-control/

    Thanks to the great pics on the recent fs thread i didn't have to look it up. We get up to 8 bolts we can sense off of with the BBK, or just use the 4 bolts if it is easier to put a sensor for that location.
    http://www.celicasupra.com/forums/sh...e-Kit-complete


    I found this DIY thread, used only 1 magnet though.
    http://www.theturboforums.com/thread...=1#post1963156

    Scroll about halfway down this page, they have a pic of sensing using the mounting bolts, and sell a sensor for 85 bucks. Might be worth asking them questions.
    http://www.advantagemotorsports.com/Sensors.htm

    These guys have a few different options as well for both front and rear. No pics of the front stuff though.
    http://www.motorsportsinnovations.co...epak-shaft.htm

    This guy says 8 bolts is decent resolution, though not much follow up.
    http://www.msextra.com/forums/viewto...=61222#p461231

    Might be able to get this company to make up rings for us...
    http://www.reluctorrings.com/

    Sorry for the rant, putting this info in there for myself more than anything. Wheel speed is still critical for ABS, not just traction control hehe

  9. #27
    Whistles racerxj220's Avatar
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    Gamble, you are definitely a valued member of this community. Thank you very much for all of that information!

    I have literally been pondering my approach for months now, and I've looked and looked for solutions, but I have failed.

    The ProEFI can use several different approaches, yes. Using wheel speed sensors is the best way to feed the ECU with information.

    There is a mounting tab on the hub I plan on using, if I found a way.

    I'm going through SpeedforSale in ATL to see about getting the trigger wheels done for the rear axles, and they will bolt up to the CV joint closest to the diff, and will mount the sensors on the subframe, close to the diff.

    ABS is on my list, but may not make it this time around.

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