Menu toggle

M030 vs RS adjustable roll bars

mbrands

mbrands

PCGB Member
Member
Hi, my 993 came with the M033 suspension, so just lowered, not sports.

I am getting a suspension upgrade at JZ : the Rook combination of Bilstein shocks with H+R springs.

My question is what to do about the roll bars. I want to dial out some of the inherent understeer and am considering either the M030 bars or the adjustable bars from the RS (abt 3x the price). Is it worth spending the extra money on the adjustable roll bars, or would that be a classic 'more money than sense' manoeuvre ?
 
Thanks Maurice, I am going lower. The new ride hight is supposed to be somewhere between M033 and RS.

Regarding JZ and Roock, I thought they were going with Manthey now, but the person I spoke to over the phone said that their Bilstein/ H+R set up was not the regular one with large diameter coils, but used narrow diameter coils and then mentioned something about it having been developed by Roock.

It costs £1250 (+ installation + VAT)
 
just had bilstien/h+r and m030 anti roll bars with camber adjustment,ive used it at the ring once since,it was fitted by jz,the handling now is fabulous,be mindful to expect a recheck/adjust of the camber/alignment after a few hundred miles...mine had settled,one side had moved a lot,ive since had all the camber adjusters replaced.
 
Thanks Guys, I'm going for the Bilsteins with H+R and M030 roll bars.

Maurice: when you say 'Are you going lower ? If so think about bump steer, the tie rods get to fairly alarming angles ...' Are you implying that bump steer is an unavoidable consequence of going lower, because of the alarming tie rod angles this produces? Or is there a remedy for this that I might be advised to take into account, given that I am going lower ? Is the alarming angle a bad thing ? (I just about know what a tie rod is)

Angry, was the camber adjustment that you had the standard adjustment that they do with your suspension package, or did you go for extra camber ?
(I understand the concept of camber & toe a bit better than I do tie rods)
 
Yes bump steer is a consequence of going lower. What you have to do is fit new uprights to cure the problem. Quote taken from www.carnewal-europe.com

"P93 Bump Steer Kit w/ EVO Uprights Full kit with new and oem parts containing the P93 GT2 EVO Uprights for left and right front, two new wheel bearings and the special Motorsport tie-rods for left and right.
Everything needed to eliminate the bump steer inherent in P93's."

Ian.

 
Thanks Ian. I think I'll go without it for the moment and see how the car drives. If the bump steer becomes a nuisance, at least I'm better informed now and will know what to do about it.

Has anyone out there tried this bump steer kit ? Is it any good ?
 
There is quite a lot of adjustment with the camber which will seriously improve your cornering ability on the track,i have no idea what mine is set at but since the last ring trip ive had the adjusters replaced and the camber adjusted to the limit at the point were the tyres would wear too much on the road,i have been told it will handle even better than last time[:D].The next trip is 12-15 aug.....cant wait.Will let you know
 
Sounds dumb i know but i dont really know what bump steer is,if its when the car gets thrown about because of stiffer suspension,then no ive not noticed any difference.Unless there is some obvious bad handling tendency i tend to drive around small characteristics of the car.All i know is that now the car handles impecably,the high speed cornering grip and total loss of the car being tail happy is fantastic.
 
Thanks Angry. To be honest, I had to look it up as well. If you type in "bump steer" on google, one or two explanations will come up, which explain it quite well.

I have noticed it a little bit on my car, which has 18" wheels, although this is more 'tramlining', and could be a function of the wheels size rather than the suspension geometry.

Nice to know you are very pleased with the way your car handles, so looking forward to getting mine back.[:)]
 
What happens is that as the suspension goes up and down the front wheels change direction slightly back and forth therefore changing the direction of the car. The symptons are that when you hit a bump the car will try to dart left or right. Its worse when cornering rather than when going straight. This is because on a lowered car the track rod between the steering rack and the suspension upright is not horizontal as it should be.

It would have to be really bad to notice it driving on our crappy roads.

Ian.
 
Is tramlining also caused by this, or is it unrelated to this particular aspect of suspension geometry ?
 
No tramlining is caused by having wide tyres. It's not particular to Porsche, any car with wide low tyres suffers.

It's most noticable when roads get slight parallel ruts in them from constant passage of lorries. Because the 993 has a different width between the wheels than most lorries you either get one side in the rut or the other and the wheel then tends to follow the path of the rut.

When I had my M030 setup with HD Bilsteins fitted I took my 18" wheels off and went back to the 17" originals and I find the car drives much better on the roads. Having the 1" narrower tyres front and back has reduced the tramlining and makes the car less jumpy. On a track the 18"s of course feel beautiful.

Ian.
 
You must log in or register to reply here.

Posts made and opinions expressed are those of the individual forum members

Use of the Forum is subject to the Terms and Conditions

Disclaimer

The opinions expressed on this site are not necessarily those of the Club, who shall have no liability in respect of them or the accuracy of the content. The Club assumes no responsibility for any effects arising from errors or omissions.

Porsche Club Great Britain gives no warranties, guarantees or assurances and makes no representations or recommendations regarding any goods or services advertised on this site. It is the responsibility of visitors to satisfy themselves that goods and/or services supplied by any advertiser are bona fide and in no instance can the Porsche Club Great Britain be held responsible.

When responding to advertisements please ensure that you satisfy yourself of any applicable call charges on numbers not prefixed by usual "landline" STD Codes. Information can be obtained from the operator or the white pages. Before giving out ANY information regarding cars, or any other items for sale, please satisfy yourself that any potential purchaser is bona fide.

Directors of the Board of Porsche Club GB, Club Office Staff, Register Secretaries and Regional Organisers are often requested by Club members to provide information on matters connected with their cars and other matters referred to in the Club Rules. Such information, advice and assistance provided by such persons is given in good faith and is based on the personal experience and knowledge of the individual concerned.

Neither Porsche Club GB, nor any of the aforementioned, shall be under any liability in respect of any such information, advice or assistance given to members. Members are advised to consult qualified specialists for information, advice and assistance on matters connected with their cars at all times.

Porsche
Lockton
Pirelli
Officially approved
Oracle Finance
WEX Esso
Collecting Cars
Archant Dialogue
Back
Top