Handbrake turns and LSD's
18 April 2001, 12:06 AM
#1
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A word of warning...
The UK and import WRX drums are quite small and I destroyed my handbrake mechanism at Wethersfield, years ago, by doing handbrake slides into the hairpin. The rear wheel seized solid and when I removed the wheel and hub, the ground just got covered with shrapnel.
The later (version 5 and later) Type R and RA's (and new WRX) have a much bigger hub and these can lock up more easily. These the same as what is used on a Group N car.
I would strongly recommend that no one does this, as it puts ridiculous loads on the hubs and diffs.
The UK and import WRX drums are quite small and I destroyed my handbrake mechanism at Wethersfield, years ago, by doing handbrake slides into the hairpin. The rear wheel seized solid and when I removed the wheel and hub, the ground just got covered with shrapnel.
The later (version 5 and later) Type R and RA's (and new WRX) have a much bigger hub and these can lock up more easily. These the same as what is used on a Group N car.
I would strongly recommend that no one does this, as it puts ridiculous loads on the hubs and diffs.
18 April 2001, 12:09 AM
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.........I use the handbrake all the time on the roads it helps give a more acute turn in and better traction out of 90deg corners and hairpins........note I live in the middle of nowhere and this is on quiet lanes and leaving b roads.......NOT in town
Remember to dip the clutch or u will rip the centre out of the diff........I take no blame for damage done to your cars and or other road users.....
Remember to dip the clutch or u will rip the centre out of the diff........I take no blame for damage done to your cars and or other road users.....
18 April 2001, 11:48 AM
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Every now and again I get this childish urge to do a handbrake turn, especially when there is crowd of young girls to impress. But being mechanically sympathetic I was wondering if this is likely to have a detremental effect on the viscous coupling between the front and rear wheels.
Anyone know if this is the case ?
I know the rally boys use the handbrake all the time, but then they probably need to change the diff on a regular basis.
Anyone know if this is the case ?
I know the rally boys use the handbrake all the time, but then they probably need to change the diff on a regular basis.
18 April 2001, 01:30 PM
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Pete C,
I seem to remember seeing you handbrake it around that corner... those many years ago... IIRC, you were running slicks at the time, which can't have helped... Mind you, everyone on the airfield knew when you had got to the corner at the end/start of each lap.
Moray
I seem to remember seeing you handbrake it around that corner... those many years ago... IIRC, you were running slicks at the time, which can't have helped... Mind you, everyone on the airfield knew when you had got to the corner at the end/start of each lap.
Moray
18 April 2001, 01:47 PM
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Hi Moray
I was on slicks. Huge amounts of braking down the hill with a jab on the handbrake was setting it up nicely... obviously it wasn't going to last for long
Was it noisy then ???
I was on slicks. Huge amounts of braking down the hill with a jab on the handbrake was setting it up nicely... obviously it wasn't going to last for long
Was it noisy then ???
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18 April 2001, 03:23 PM
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I'm using a 22B LSD rear diff with version 5 RA driveshafts and hubs. These hubs use the larger 2 pot rear disc set up and the bigger handbrake shoes.
The handbrake is still cable operated, but a quick tug will lock the rears on dry tarmac without any need to use the brake pedal.
The handbrake is still cable operated, but a quick tug will lock the rears on dry tarmac without any need to use the brake pedal.
18 April 2001, 03:27 PM
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But how would dipping the clutch save your diff ? You would still have the front wheels rotating whilst the rears were stationary.
I get a similar problem when I take my Range Rover for an MOT, they can use the brake test rollers as one set of wheels will be stationary.
I get a similar problem when I take my Range Rover for an MOT, they can use the brake test rollers as one set of wheels will be stationary.
18 April 2001, 04:00 PM
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Because there then is no strain on it-Hence your not locking your wheels. If the clutch is engaged you are not then letting the rear wheels drive, only free wheel..hence locking is ok...
But take Petes advice, just don't do it.
R
But take Petes advice, just don't do it.
R
18 April 2001, 07:46 PM
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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:<HR>Originally posted by RonaldoH:
<B>Because there then is no strain on it-Hence your not locking your wheels. If the clutch is engaged you are not then letting the rear wheels drive, only free wheel..hence locking is ok...
[/quote]
Sorry.
Didn't understand that. (No doubt 'cos I'm stupid)
Could you explain further?
Rich
<B>Because there then is no strain on it-Hence your not locking your wheels. If the clutch is engaged you are not then letting the rear wheels drive, only free wheel..hence locking is ok...
[/quote]
Sorry.
Didn't understand that. (No doubt 'cos I'm stupid)
Could you explain further?
Rich
18 April 2001, 10:16 PM
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"Like most rally drivers do" ?
I think you will find that most decent rally drivers do not !!!!! Clubman drivers do it all of the time but on some events, I have only used it once or twice at the very most.
The problem with using the handbrake on your one and only visit to a corner is that it is an imprecise method and often only serves to provide a dramatic looking turn for the spectators.
On gravel etc. Yes on tarmac save all but the most severe of hairpins, its slow and amatuer.......Looks good though...
I would also support Petes observations....If you do it in a standard Impreza, you will end up with a locked up rear brake and a bill..You have been warned!
[This message has been edited by Mike@PD (edited 18 April 2001).]
I think you will find that most decent rally drivers do not !!!!! Clubman drivers do it all of the time but on some events, I have only used it once or twice at the very most.
The problem with using the handbrake on your one and only visit to a corner is that it is an imprecise method and often only serves to provide a dramatic looking turn for the spectators.
On gravel etc. Yes on tarmac save all but the most severe of hairpins, its slow and amatuer.......Looks good though...
I would also support Petes observations....If you do it in a standard Impreza, you will end up with a locked up rear brake and a bill..You have been warned!
[This message has been edited by Mike@PD (edited 18 April 2001).]
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