liteboy

Strange request you may think, however I am sprint racing a 94 WRX and in the dry with slicks the grip is so good that under braking the ABS cuts in just when you don't need it. Has anyone done this, have any diagrams etc etc

Thanks

Andy

dazc

Not sure on a scooby, but unplug the abs sensors on the hub and tie wrap it out of the way, or remove the fuse? Just a thought, but you could buy some stickier tyres which wouldn't be as prone to locking up.

Engineer@Uni

are you sure the ABS is cutting in when it's not needed? I think the ABS only activates when the wheels are almost locked, and although with slicks you might still break pretty good like that, it would cost you some tyre-surface I'd guess... But I guess there is a possibility I'm wrong, because I'm not 100% sure how ABS works. I'd second taking it's fuse out, as it's the easiest and quickest mod to do. If you run the car as a road car, getting under and reconnecting 4 ABS channels all the time might not be suitable. Mind you, any disturbance to the fuses is very liekly to throw on some kind of warning light. I'm even wondering if it'll interfere with your break servo, as the ABS might use that as part of it's function.

Miniman

iTrader: (2)

A recent couple of threads about legailty on road cars of disabling the ABS suggested that removing the fuse was the easiest option and caused no side effects - well other than the thread where the guy skidded on ice and crashed his car with the fuse removed.

dazc

ABS probably more of a hinderance on ice anyway.

But I bet he put the fuse back in before the assessor came round...

Miniman

iTrader: (2)

Unsure, but he told the Police when the picked him out of the ditch :-)

911

I hill climb my Sti v3 on semi slicks, and the ABS facillity is a real pain.
My 'ABS' dash light will come on after a 'moment' on the track and stay on for ages, even when the car is switched off and re started....

Impreza brakes are simply very poor and the ABS is no better.

No wonder RA's don't have it.

I'm thinking of pulling the fuse, blow it, and put it back in. Solves all the above issues?

Graham.

2.5RS King

pull the fuse & then take the bulb out of the cluster so it does not galre back up at you all the time!

There is also a mod where you hook it up to a switch so instead of taking the fuse out you can more selectively remove the ABS.

http://www.tovey.ca/wrx/abs.asp

for a new-age but should be the same thing!

liteboy

I have had a good look at the system and as we don't use the car on the road we may just replace the master cylinder with the RA one and junk the whole unit.

911

Save weight too!
Let me know how much/easy it is to fit an RA cylinder please.
911

ALi-B

iTrader: (1)

Removing the fuses is the easiest option....braking performance is much less of a worry. The early Scoobs ABS systems seem to over-react in a big way...always at the worst or critical moment too (whilst braking ).

Something to note for race use is that usually ABS equipped cars tend to have slightly more-rearward biased braking than non-ABS cars. Certainly in my experience it's possible to lock the rears on my scoob without the ABS in some circumstances, but I cannot be certain if this was due to traction or lifting off unsettling the car too much, or brake bias. If it is the case then a RA master cylinder or a biasing valve would be a wise move.

Tim-H

The below is part of the motec , subaru diff controler manual, download SDC for full version with drawings, http://software.motec.com.au/release/ it seems to be for the newer ones 2002 > but It may help, there are pictures in the full manual of the ABS setup,
or buy an RA :-)
Have a good one,
Tim
MoTeC SDC 16 Appendices
Appendix D – Removing ABS systems
The removal of the ABS valve block for weight saving in rally applications directly affects the speed inputs to the
SDC. In the standard factory wiring, the magnetic wheel speed sensors are conditioned by the ABS controller and
then passed on the diff controller.
If the ABS system is removed, there are two possible methods for getting wheel speeds to the SDC.
The first method is a partial removal of the ABS systems, retaining the ABS electronics and removing the
solenoids and valve block. This is the recommended method.
The second method is a full removal of the ABS systems, looping back the wheel speed pins at the ABS
connector, and configuring the SDC to use magnetic sensors.
Method 1: Partial ABS Removal
Retaining the ABS electronics allows wheel speeds to pass through to the SDC without any wiring modifications.
This is the recommended method for removing the ABS.
The following steps detail modifications to remove all unnecessary ABS parts.
Step 1: Remove the black electronic module from the valve block
Step 2: Remove the 8 solenoids from the electronic module. The solenoid wires can be broken by working the
solenoids back and forwards with pliers until the wire breaks under fatigue. Clean up any loose wires left on the
module.
Step 3: Cut off the plastic surround which enclosed the solenoids. This is an optional step for further weight
reduction.
Step 4: Break out pin 21 on the module connector by twisting the pin with pliers. This pin must be removed to
prevent the ABS warning from turning on the brake warning, which also pulls down the handbrake signal into the
diff controller.
ABS module with the
solenoids removed and the
solenoids surround cut off.
ABS module pins showing
pin 21 removed
MoTeC SDC 17 Appendices
Removed solenoids and
solenoid surround
Method 2: Full ABS Removal
If the ABS valve block and electronics are fully removed, the wiring for the speed sensor pins must be looped back
at the ABS loom connector to directly connect the magnetic sensors to the SDC.
To loop back the speed inputs, the ABS connector must be wired as shown:
Function Pin Pin Function
RL MAG + 7
19 RL to SDC
RL MAG 0V 8
3 Sensor 0V to SDC pin 10
FR MAG + 11
16 FR to SDC
FR MAG 0V 12
3 Sensor 0V to SDC pin 10
FL MAG + 9
17 FL to SDC
FL MAG 0V 10
3 Sensor 0V to SDC pin 10
RR MAG + 14
18 RR to SDC
RR MAG 0V 15
3 Sensor 0V to SDC pin 10
Important!
The ABS connector has an integrated shorting bar between pins 21 and 22 that is activated when the connector is
unplugged from the ABS module. This shorting bar activates the ABS warning and the brake warning, which also
activates the handbrake signal into the diff controller.
If the ABS connector is retained on the loom, but is not plugged into the ABS unit, the shorting bar must either be
cut, or securely jammed open in order for the SDC to operate correctly.
Important!
· SDC link LK07 must be closed so that SDC pin 10 can be used as the sensor 0V
· The ABS input must be disabled in the SDC configuration
The ABS loom connector is shown below:

Nezz10

To disable the ABS get to the fuse box and remove the ABS fuse. Sorted.

(P.S there is two ABS fuses, a 10A and a 15A, its the 15A you need)

liteboy

I have an RA master cylinder on the way, £35 +vat from the guys at Grade A. I also have the TEG sport servo replacement rod to be fitted at the same time, so not only no ABS but no servo either.

As the car doesnt have an electronic centre diff we hopefully should not need any mods.

If anyone want to look at the car it is on my website www.theburrells.com, any sponsorship welcome. Pictures are from Brand's test day.

stockcar

very strange as none of the "classic" DCCD equipped cars have ABS or wheel speed sensors!!!!!!!!!

no idea where that info has come from unless aimed at the later auto DCCD equipped cars??

Tim-H

AFAIK most of the DCCD classic cars were "RA`s," no ABS on RA`s , no need for wheel speed sensors ( if any one know`s how to fit them please mail me ) the motec SDC unit is aimed at 2002> cars with abs and dccd,(auto) but the unit could be used on the earlyer box aswell,
Tim

Yanos

Hi guys, bumping up an old thread!

I would like to know if anyone of you have taking out the whole ABS unit (unit under the hood just in front of the air filter).

My track car is a V7 STI and I am not using the ABS so I would like to take out the whole unit for weight reduction. Is this complex to do ?

Thanks for your input!

Thought I would show you a picture of her (I am still in love after all those years with her):

joey_turbo

iTrader: (26)

There was a post recntly by Ian Godney about him removing it from his classic by making up new pipes that bypass the ABS system. It should be the same sort of thing on the newages, with just the electrical side to take care of.

Yanos

Thanks for the quick reply. Is his username Ian Godney ? I will search for his post.

Yanos

I did not find it.

Can you give me the link to that post ?

Thanks!

joey_turbo

iTrader: (26)

Here it is: https://www.scoobynet.com/wheels-tyr...-help-abs.html

Yanos

great, many thanks Joey!