Whitline roll center kits?
01 April 2009, 11:29 AM
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01 April 2009, 06:33 PM
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rcak
hi m8 roll centre adjusting kit is to combat bump steer on lowered suspension
the kit consists of two altered balljoints and two altered track rod ends
the shanks of the tapers are longer than o/e equipment to cure the b/steer on undulations when the suspension is on full or oe near full compression
(steering wheel tug ) the arc that the track rods can work on is increased within the parameters .
cheers geo
the kit consists of two altered balljoints and two altered track rod ends
the shanks of the tapers are longer than o/e equipment to cure the b/steer on undulations when the suspension is on full or oe near full compression
(steering wheel tug ) the arc that the track rods can work on is increased within the parameters .
cheers geo
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01 April 2009, 07:41 PM
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Actually, Geo, it does a bit more than that. The Whiteline roll centre kit moves the front roll centre up. This means that the distance between the centre of gravity and the roll centre reduces. To put it in simple terms, the distance between COG and RC has a huge influence on the amount the car wants to roll during cornering. The bigger the distance, the more the car wants to roll.
On lowered cars it is even more important. When a vehicle with McPherson type struts is lowered by say 40mm, the COG drops 40mm. But the RC will drop by 2 or 3 times that amount (sometimes dropping the RC below ground level and inducing RC that migrates sideways, but that is a different story). This means that the distance between COG and RC has increased, resulting in a tendency to roll more and lower grip levels.
The Whiteline RollCentre Kit moves the RC up by using taller lower ball joints. If you would just fit these ball joints, the RC would move up but bumpsteer would increase. Therefore Whiteline has included replacement track rod ends to correct the bumpsteer.
Having used the Whiteline RC kit myself, I can say, it works! More front end grip, less feeling like the car is 'falling over its outside front wheel' during cornering and more precise steering.
Cheers
On lowered cars it is even more important. When a vehicle with McPherson type struts is lowered by say 40mm, the COG drops 40mm. But the RC will drop by 2 or 3 times that amount (sometimes dropping the RC below ground level and inducing RC that migrates sideways, but that is a different story). This means that the distance between COG and RC has increased, resulting in a tendency to roll more and lower grip levels.
The Whiteline RollCentre Kit moves the RC up by using taller lower ball joints. If you would just fit these ball joints, the RC would move up but bumpsteer would increase. Therefore Whiteline has included replacement track rod ends to correct the bumpsteer.
Having used the Whiteline RC kit myself, I can say, it works! More front end grip, less feeling like the car is 'falling over its outside front wheel' during cornering and more precise steering.
Cheers
Last edited by lookout; 01 April 2009 at 07:43 PM.
01 April 2009, 08:01 PM
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I have just fitted one, and you can see the physical difference clearly. I can't comment on the difference it makes when driving as I haven't had the wheel alignment done yet and having stripped the complete suspension and fitted quite a few adidtional bits I need to do that first.
If you are getting one it is worth speaking to Dave Featherstone at Demon Tweeks (01978 663042) and quote scoobynet as he does a good price. Mine was £134 including 24hr delivery compared with Scoobypart (iirc) who are £135 plus delivery.
If you are getting one it is worth speaking to Dave Featherstone at Demon Tweeks (01978 663042) and quote scoobynet as he does a good price. Mine was £134 including 24hr delivery compared with Scoobypart (iirc) who are £135 plus delivery.
01 April 2009, 10:35 PM
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Actually, Geo, it does a bit more than that. The Whiteline roll centre kit moves the front roll centre up. This means that the distance between the centre of gravity and the roll centre reduces. To put it in simple terms, the distance between COG and RC has a huge influence on the amount the car wants to roll during cornering. The bigger the distance, the more the car wants to roll.
On lowered cars it is even more important. When a vehicle with McPherson type struts is lowered by say 40mm, the COG drops 40mm. But the RC will drop by 2 or 3 times that amount (sometimes dropping the RC below ground level and inducing RC that migrates sideways, but that is a different story). This means that the distance between COG and RC has increased, resulting in a tendency to roll more and lower grip levels.
The Whiteline RollCentre Kit moves the RC up by using taller lower ball joints. If you would just fit these ball joints, the RC would move up but bumpsteer would increase. Therefore Whiteline has included replacement track rod ends to correct the bumpsteer.
Having used the Whiteline RC kit myself, I can say, it works! More front end grip, less feeling like the car is 'falling over its outside front wheel' during cornering and more precise steering.
Cheers
On lowered cars it is even more important. When a vehicle with McPherson type struts is lowered by say 40mm, the COG drops 40mm. But the RC will drop by 2 or 3 times that amount (sometimes dropping the RC below ground level and inducing RC that migrates sideways, but that is a different story). This means that the distance between COG and RC has increased, resulting in a tendency to roll more and lower grip levels.
The Whiteline RollCentre Kit moves the RC up by using taller lower ball joints. If you would just fit these ball joints, the RC would move up but bumpsteer would increase. Therefore Whiteline has included replacement track rod ends to correct the bumpsteer.
Having used the Whiteline RC kit myself, I can say, it works! More front end grip, less feeling like the car is 'falling over its outside front wheel' during cornering and more precise steering.
Cheers
01 April 2009, 10:41 PM
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02 April 2009, 10:32 AM
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Thanks for the explanations..
One question, if you effectively raise the hubs presumably that means the driveshafts will also be raised..?
When I had my AST/T25 kit fitted the car was lowered just enough so the driveshafts were parallel to the ground, which I believe to be a good thing..?!
One question, if you effectively raise the hubs presumably that means the driveshafts will also be raised..?
When I had my AST/T25 kit fitted the car was lowered just enough so the driveshafts were parallel to the ground, which I believe to be a good thing..?!
07 April 2009, 11:21 PM
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Thanks for the explanations..
One question, if you effectively raise the hubs presumably that means the driveshafts will also be raised..?
When I had my AST/T25 kit fitted the car was lowered just enough so the driveshafts were parallel to the ground, which I believe to be a good thing..?!
One question, if you effectively raise the hubs presumably that means the driveshafts will also be raised..?
When I had my AST/T25 kit fitted the car was lowered just enough so the driveshafts were parallel to the ground, which I believe to be a good thing..?!
15 April 2009, 06:03 PM
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all done and fitted not too bad at all, n/s ball joint tried to stay on car 
but i had other ideas finally got it out in a few pieces 
not really tested car yet so will give it a blast tomorrow see if i can notice any difference
but i had other ideas finally got it out in a few pieces not really tested car yet so will give it a blast tomorrow see if i can notice any difference
17 April 2009, 06:07 PM
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