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Old 20th March 2011, 20:38   #1
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Default Reducing ABS sensitivity - SX4

Is it at all possible to adjust the sensitivity of the ABS on a SX4 either via an ECU adjustment or any other means?
Roads in Pune are full of potholes and I am sick & tried of the ABS kicking in if the car goes over a pothole while braking
The other day, I almost banged an idiot biker who tried to cut across the entire road almost horizontally, and although I'd have been driving at 25kmph, the abs still locked in because 1 of the wheels was going over a pothole the moment i hit the brakes
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Old 20th March 2011, 21:57   #2
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Default Re: Reducing ABS sensitivity - SX4

Get better tires. (better meaning softer and more grippy compund/thread) upsize if necessary
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Old 20th March 2011, 22:21   #3
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Default Re: Reducing ABS sensitivity - SX4

Its not a calibratable parameter and can't be adjusted. You can turn off the ABS completely by removing the fuse. Normal brakes will function then. The ABS failure lamp will glow on dashboard. Try and see if this solves the purpose. On the other hand I am wondering why you drive so fast on potholes ?
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Old 21st March 2011, 09:57   #4
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Default Re: Reducing ABS sensitivity - SX4

Neither can it be set to a different sensitivity, nor is it a sane thing to do. Imagine a situation where it is really needed and you have tampered with it or switched it off.

Not a good thing to say (please do not be offended), but perhaps you need to look at your braking method. Quite likely you brake at the last moment, and really hard. Undesirable situations can / will happen, but if you brake earlier and gradually increase pressure, you will definitely not reach situations that will make ABS kick-in.
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Old 21st March 2011, 10:51   #5
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Default Re: Reducing ABS sensitivity - SX4

I would not recommend any such thing as ABS switch off for this beast. I would rather say you upsize your tires or you lower your tire pressure to 2-3 psi for better braking and comfort.

Such thing happen when you break on a pot hole or multiple speed breakers. The car thends to kickin the ABS when the wheels are in air and no contact on road, as soon as wheel touchs the ground there is a feel of no breaking as the wheels tends to roll and in a fraction the the ABS takes over the brakes. During this sometimes i have felt my heart in mouth (i guess you understand my feeling).
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Old 21st March 2011, 11:12   #6
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Default Re: Reducing ABS sensitivity - SX4

Quote:
Originally Posted by abhi182 View Post
...the abs still locked in because 1 of the wheels was going over a pothole...
So what? The other 3 wheels would still be stopping the car. Without ABS you are more likely to lose control and end up with the car swinging around while going over the pothole. At least with ABS you have steering control and can steer to avoid the biker.

In any case, as others already mentioned, please drive slow over potholes.
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Old 21st March 2011, 11:23   #7
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Default Re: Reducing ABS sensitivity - SX4

Since there is ABS in question, I think you have Zxi variant. The tyres on this are 205 patch, so already pretty wide. Most likely they are JK's which we know are not that great. Based on what you mentioned, please see my suggestions below. These are in the order of most likely to help to less likely to help.

1. Please see if you can change the way you brake. Normally, you should brake/ slow down before the potholes than when into them. ABS will always kick in (and should) when the wheels lock and they'll lock if the tires are in the air. Try going over pot holes at a little less speed so the car does not bounce much.
2. Lower the air pressure in tyres. SX4 is already a little bouncy due to stiffer suspension.
3. If you feel the need, change to better quality tyres. This will be costly though for the SX4 Zxi size tyres.

Lastly, do not touch ABS unit. That's doing exactly what you wanted it to do when you paid for it.

Friend, these are just my views, so please don't get offended. Drive safe!
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Old 22nd March 2011, 14:49   #8
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Default Re: Reducing ABS sensitivity - SX4

I have been driving on the moon crater roads of Gurgaon and never had this problem till now.

Honestly even I feel you are braking at last moment, on bad roads, unless you confirm us wrong
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Old 22nd March 2011, 16:02   #9
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Default Re: Reducing ABS sensitivity - SX4

Why would you want to fiddle with the ABS at all?
As others have said, you need to drive with just a bit of anticipation while driving over potholes. Be in the right gear for one thing. Tap the brakes as required, in advance, well before you land in the pothole. I know sometimes it is easier said than done (we face similar road issues here in Bangalore), but driving with anticipation is the only way open to us. Also, you should never JAM the brakes if it is avoidable. Better to tap them - but this is only possible when you drive with anticipation.
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Old 22nd March 2011, 16:03   #10
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Default Re: Reducing ABS sensitivity - SX4

From all I know it is to release the brakes when the wheel locks and not the otherway around. It dosen't work below a particular speed, may be below 20kmph.
What is kick in?
If wheels lock , ABS is not working

Last edited by gigy : 22nd March 2011 at 16:05.
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Old 22nd March 2011, 16:08   #11
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Default Re: Reducing ABS sensitivity - SX4

Yes. ABS is to prevent the wheels locking. ABS = ANTI LOCK BRAKING SYSTEM.
By "Kick in" he probably means the ABS "kick" which one feels when one applies the brakes on a car which has ABS. It is a sort of "resistance/ back pressure" kind of feeling one feels from the brake pedal when one presses the brake.

Quote:
Originally Posted by gigy View Post
What is kick in?
If wheels lock , ABS is not working
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Old 22nd March 2011, 19:48   #12
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Default Re: Reducing ABS sensitivity - SX4

As everyone has said rightly,don't ever think of tampering with the ABS system.I feel the ABS is kicking early because either you have kept a very high tire pressure or braking hard at the very last moment.Check the above two.Also the JK Vectras aren't the best tires available.They are rock hard and hardly offer any decent grip.Changing to better rubber from Yoko's or Michelin stable will solve your problem to a certain extent for sure.

But there is a phenomenon called "False Modulation" in which the ABS unnecessarily kicks in.In that case there is a problem with the ABS module.
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Old 23rd March 2011, 10:10   #13
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Default Re: Reducing ABS sensitivity - SX4

"Kick-in" is a colloquial term signifying that the controller starts acting to correct an undesirable situation.

Yes, gigy, you are right that if a wheel locks, ABS is not working. But, ABS action is not dependent on vehicle speed - it is dependent on magnitude of deceleration of wheel speed.
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Old 23rd March 2011, 10:50   #14
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Default Re: Reducing ABS sensitivity - SX4

Quote:
Originally Posted by abhi182 View Post
I'd have been driving at 25kmph, the abs still locked in
As per my knowledge (I could be wrong) the ABS won't kick in at such lower speed, it will be active only after 35-40 kmph.

Experts comments awaited.
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Old 23rd March 2011, 10:56   #15
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Default Re: Reducing ABS sensitivity - SX4

In the main answers have already been given.

In addition what you need to do - in fact all owners with ABS should - is to test out ABS on a road where there is no traffic. Most of us freeze when slamming brakes but with ABS the whole point is that you can still steer. So get used to steering your way out of trouble.

Going even further. Steering away may not always be the answer as how much you can steer away also is dependent on the trajectory taken by the "idiot" If nothing else it can soften the impact from dead on/side on to glancing one.
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