Lowering the steering rack and adjusting the rake.
Discussion
Has anyone had the steering rack lowered and the rake adjusted, due to too much rear bias, on an early (2000) mk1?
I have had the rack reconditioned, have the front spacers and Nitrons, but the steering is still a little twitchy and goes light at speed.
This has been suggested as a cure. Just wondering, if you have had this done, what your experience of the effect is?
I have had the rack reconditioned, have the front spacers and Nitrons, but the steering is still a little twitchy and goes light at speed.
This has been suggested as a cure. Just wondering, if you have had this done, what your experience of the effect is?
I'd be very carefull with rack height. My studies showed that adjusting the height has a significant effect on the behaviour of the front geo and bump steer. If its going light it's probably due to aerodynamic lift. Have u got a splitter and is your ride height correct? If the car is even slightly higher at the front air will be being forced beneath the front end causing lift.
Sorry, my mistake, I meant to say raising the rack not lowering.
I do have a splitter. I don't know if the ride height is correct, but apparently the rake is showing too much rear bias causing the lifting at speed. I have just emailed Warren at Topcats to see what he advises.
I do have a splitter. I don't know if the ride height is correct, but apparently the rake is showing too much rear bias causing the lifting at speed. I have just emailed Warren at Topcats to see what he advises.
Edited by S6 Devil on Wednesday 27th February 13:38
S6 Devil said:
Sorry, my mistake, I meant to say raising the rack not lowering.
I do have a splitter. I don't know if the ride height is correct, but apparently the rake is showing too much rear bias causing the lifting at speed. I have just emailed Warren at Topcats to see what he advises.
Hi S6 Devil,I do have a splitter. I don't know if the ride height is correct, but apparently the rake is showing too much rear bias causing the lifting at speed. I have just emailed Warren at Topcats to see what he advises.
Edited by S6 Devil on Wednesday 27th February 13:38
What is steering rake? I've not heard that term in relation to steering geo. have you seen my experiment I wrote up in a ph post ? That should explain what raisin the rack can do in terms of bump steer. If you fancy chatting about this drop me a line with your number. I'd be interested to hear what advice you've been given.
Martin
Hi Martin,
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
Yes, I did read it, very useful!
So far Str8six have been the only ones who have given advice. To answer your question about rake, according to my limited knowledge, rake is the amount of bias to either front or rear. Apparently mine has too much rear bias causing the front to lift at speed. I don't know what is adjusted to change this as yet. Once I find out, I will update this post.
Warren at Topcats needs to look at the car, to advise what mods need doing. He has given a figure of £200 plus vat to do what needs doing. Again, I will update when I know more.
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
Yes, I did read it, very useful!
So far Str8six have been the only ones who have given advice. To answer your question about rake, according to my limited knowledge, rake is the amount of bias to either front or rear. Apparently mine has too much rear bias causing the front to lift at speed. I don't know what is adjusted to change this as yet. Once I find out, I will update this post.
Warren at Topcats needs to look at the car, to advise what mods need doing. He has given a figure of £200 plus vat to do what needs doing. Again, I will update when I know more.
S6 Devil said:
Hi Martin,
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
Yes, I did read it, very useful!
So far Str8six have been the only ones who have given advice. To answer your question about rake, according to my limited knowledge, rake is the amount of bias to either front or rear. Apparently mine has too much rear bias causing the front to lift at speed. I don't know what is adjusted to change this as yet. Once I find out, I will update this post.
Warren at Topcats needs to look at the car, to advise what mods need doing. He has given a figure of £200 plus vat to do what needs doing. Again, I will update when I know more.
Does seem good value for a fix at £200....please if you dont mind letting us know what you have done?http://www.pistonheads.com/gassing/topic.asp?h=0&a...
Yes, I did read it, very useful!
So far Str8six have been the only ones who have given advice. To answer your question about rake, according to my limited knowledge, rake is the amount of bias to either front or rear. Apparently mine has too much rear bias causing the front to lift at speed. I don't know what is adjusted to change this as yet. Once I find out, I will update this post.
Warren at Topcats needs to look at the car, to advise what mods need doing. He has given a figure of £200 plus vat to do what needs doing. Again, I will update when I know more.
MPETT said:
S6 Devil said:
Sorry, my mistake, I meant to say raising the rack not lowering.
I do have a splitter. I don't know if the ride height is correct, but apparently the rake is showing too much rear bias causing the lifting at speed. I have just emailed Warren at Topcats to see what he advises.
Hi S6 Devil,I do have a splitter. I don't know if the ride height is correct, but apparently the rake is showing too much rear bias causing the lifting at speed. I have just emailed Warren at Topcats to see what he advises.
Edited by S6 Devil on Wednesday 27th February 13:38
What is steering rake? I've not heard that term in relation to steering geo. have you seen my experiment I wrote up in a ph post ? That should explain what raisin the rack can do in terms of bump steer. If you fancy chatting about this drop me a line with your number. I'd be interested to hear what advice you've been given.
Martin
This means that the rear ride height is set a little higher than the front. I believe most have a 10mm difference between front & rear ride height...."the rake".
In the thread, mention is made of the splitter...I guess rake will give it a different 'angle of attack' (aerodynamically) thereby affecting/increasing the front downforce on the car in a straight line at a given steady speed.
All IMHO. Nick
Robertjp said:
Does seem good value for a fix at £200....please if you dont mind letting us know what you have done?
The car is actually already booked in with Jason. Warren didn't advise any different fixes to that already given by Jason. So basically, rake adjustment which it seems is ride height, to alter rear bias, raising of steering rack and a geo set up. Jason estimated 2-3 hours labour so a similar price to Warren, maybe a little cheaper!S6 Devil said:
Just got back from Str8six and what a transformation.
I had the rack and rear ride height raised and a 4 wheel alignment. The drive is like night and day, Fantastic! Why did I wait so long to have this done!!
I was thinking about getting my rack raised, based on this I think I'll be giving Jason a call. Do they have a plate made up that matches the mount or do they use washers? I had the rack and rear ride height raised and a 4 wheel alignment. The drive is like night and day, Fantastic! Why did I wait so long to have this done!!
Also, do you know what they set your ride height to? I know mine is out as the front is actually higher than the rear. I planned to get my c spanner out this weekend and get it sorted. Then rack and geo and all should be sweet.
SteveTusc said:
I was thinking about getting my rack raised, based on this I think I'll be giving Jason a call. Do they have a plate made up that matches the mount or do they use washers?
I don't know to be honest but was charged a minimal fee for a "specialist part" which may have been either.SteveTusc said:
Also, do you know what they set your ride height to? I know mine is out as the front is actually higher than the rear. I planned to get my c spanner out this weekend and get it sorted. Then rack and geo and all should be sweet.
No but mine was way out as was the rear camber. Well worth the drive up there!Robertjp said:
thanks for letting us know, inrigued as to whether a different width spacer is used for cars of different years??
I guess thats why its a specialist part
Without spending time doinf MPETT's experiment not sure how i know what to space it by...
You don't really without measuring it. Cars vary a bit anyway and throw in different track rod ends etc.I guess thats why its a specialist part
Without spending time doinf MPETT's experiment not sure how i know what to space it by...
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