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Re: rear stifness
[Re: crgracing]
#1220809
28/05/2011 16:24
28/05/2011 16:24
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Taz
Unregistered
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Taz
Unregistered
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the only real way to improve is by fitting a thicker rear ARB, anything else to prevent wandering at the rear is pointless, as the shell sits on a metalastic set of bushes which fit to the subframe. You "could" replace the rearmost set of bushes with Alu' items as this makes a slight difference. I do believe some others have fitted a cosmetic rear seatbelt ARB ( looks VERY OEM & well made ), some have commented that this has reduced rattles a bit... probably as the old seat belt bolts were loose
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Re: rear stifness
[Re: Scuderia]
#1220842
28/05/2011 17:38
28/05/2011 17:38
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proccy
Unregistered
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proccy
Unregistered
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a 22mm whiteline ARB has helped mine quite a bit, the front braces are good too, and i added a dedra front ARB - feels quite flat and soilid to me, but i'm no expert
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Re: rear stifness
[Re: crgracing]
#1220973
28/05/2011 23:21
28/05/2011 23:21
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Duffy
Unregistered
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Duffy
Unregistered
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I've got upper/lower front braces and a 22mm whiteline rear ARB, roll is much reduced compared to OEM.
I've also got the upper rear brace, looks nice but I suspect it doesn't do a lot more!
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Re: rear stifness
[Re: crgracing]
#1220979
28/05/2011 23:35
28/05/2011 23:35
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johnnybravoturbo
Unregistered
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johnnybravoturbo
Unregistered
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Strut braces make no difference despite the hype,. Although i am a fan that lots of little things make a big difference. In relative terms the chassis wont twist to the extent where 1 single bar will help.Or you'll have the seem sealant cracking and the windows popping out. A well engineered roll cage which acts as safety and as an aid to structural stability is noticeable.
Strut braces are literally cosmetic.
I run a Eibach rear roll bar,which seemed to make the front end more precise on turning. The Whiteline is a little unpredictable.
I messed about quite alot around the track with my Gaz suspension and making the back too firm induced heavy overseer and issues with braking. It also didn't inspire quick cornering as you get a feel for things after time. I found the Eibach a good all round solution to the handling with very forgiving cornering no matter how much you get it wrong,.
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Re: rear stifness
[Re: crgracing]
#1221028
29/05/2011 01:25
29/05/2011 01:25
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johnnybravoturbo
Unregistered
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johnnybravoturbo
Unregistered
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I disagree with the comparison to Rwd,. I outhandled a Porsche GT3 RS around Donington park and i run a FWD setup. The coupe in stock form is not an agile car on the corners. With money spent in the right places you escape the limitations of the FWD. I dont suffer with oversteer unless heavy braking into a corner in the wet. Under what circumstances does your oversteer typically appear?
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Re: rear stifness
[Re: ]
#1221083
29/05/2011 10:58
29/05/2011 10:58
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Joined: Dec 2005
Posts: 9,706 Gone
Jimbo
Je suis un Coupé
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Je suis un Coupé
Joined: Dec 2005
Posts: 9,706
Gone
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I outhandled a Porsche GT3 RS around Donington park
I think there's a big difference between outhandling and having bigger balls through the corners. A GT3 RS would show a coupe a clean set of heels every day of the week and if it was my GT3 RS, I'd be a little concerned about driving it on the ragged edge too, it would be a little more expensive to fix if you got it wrong.
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Re: rear stifness
[Re: crgracing]
#1221280
29/05/2011 18:01
29/05/2011 18:01
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jonone
Unregistered
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jonone
Unregistered
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The problem is i get big understeer in fast corners. do you not mean oversteer?...understeer in fast corners sounds a little strange? As people have said, there is a few ways to stiffen the rear of the car... rear arb, solid bushes, stiffer springs, harder dampers settings,tyre pressures etc will all change how the car feels and reacts. The rear trailing arm bearings are one thing to replace, if there is play in them they effectively give you rear steering which means oversteer!
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Re: rear stifness
[Re: crgracing]
#1221346
29/05/2011 21:15
29/05/2011 21:15
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jonone
Unregistered
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jonone
Unregistered
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Thats true in low speed bends, but high speed?
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Re: rear stifness
[Re: crgracing]
#1221413
30/05/2011 00:43
30/05/2011 00:43
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jonone
Unregistered
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jonone
Unregistered
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Rear arb should be top priority then!
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Re: rear stifness
[Re: crgracing]
#1221457
30/05/2011 10:30
30/05/2011 10:30
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Per
Unregistered
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Per
Unregistered
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Been looking at recent BMW´s Audi´s etc, I will look into transverse stiffening brace over the "prop-tunnel", which many cars use nowadays (actually it's already on the Golf Mk3). Just in front of the rear axle.
Problem for my Coupe and many others might be the big exaust which is a bit in the way.
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Re: rear stifness
[Re: ]
#1221507
30/05/2011 12:37
30/05/2011 12:37
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suba
Unregistered
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suba
Unregistered
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Thats true in low speed bends, but high speed? The same applies - a front heavy, FWD car is always going to understeer when on the power. Stiffening the rear and playing with alignment / suspension will result in lift off oversteer - so you can control what the car is doing with your right foot once it's pointing where you want it to.
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Re: rear stifness
[Re: Jimbo]
#1221563
30/05/2011 15:50
30/05/2011 15:50
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sediciRich
Unregistered
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sediciRich
Unregistered
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I outhandled a Porsche GT3 RS around Donington park
I think there's a big difference between outhandling and having bigger balls through the corners. A GT3 RS would show a coupe a clean set of heels every day of the week and if it was my GT3 RS, I'd be a little concerned about driving it on the ragged edge too, it would be a little more expensive to fix if you got it wrong. Bang on Jim, I minced a GT3RS round Donny, but the driver did not have a clue and was cleary scared, a well driven GT3 would blow a coupe into the weeds. Outhandled JBT I dont think so, if you were driving the GT3 you would blow away your own coupe lap time for sure.
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Re: rear stifness
[Re: crgracing]
#1221632
30/05/2011 19:25
30/05/2011 19:25
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suba
Unregistered
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suba
Unregistered
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When did you last have the tracking done? How did they set up the car?
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Re: rear stifness
[Re: ]
#1221677
30/05/2011 20:37
30/05/2011 20:37
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jonone
Unregistered
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jonone
Unregistered
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Thats true in low speed bends, but high speed? The same applies - a front heavy, FWD car is always going to understeer when on the power. This maybe technically true but I have never had understeer at speed? Nigel is right you should get everything checked to make sure nothing is a miss....then put the rear arb on The rear geometry is not adjustable, but in an ideal world you should set the front in line with the back, so four wheel alignment is better. The correct geometry makes a big difference on my car, so its worth getting setup properly. I have been trying to get my car to handle right for years and it is still not there, I have had my rear bearings checked and they have no play but they do have 4mm toe in on one side,I should have just changed them last time.....but I'm getting them changed soon and i'm hoping this will be the last piece in the jigsaw!
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Re: rear stifness
[Re: ]
#1221711
30/05/2011 21:39
30/05/2011 21:39
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suba
Unregistered
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suba
Unregistered
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Try turning in hard at about 80 mph with no throttle on - I promise you the car will go straight on unless you are running some very severe negative camber on the front, and a very stiff rear - even then the weight will go on the front outside wheel, and you'll go sideways when it bites. If you do the same in something mid engined the car will still go straight on, but either sideways or backwards.
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Re: rear stifness
[Re: crgracing]
#1221798
31/05/2011 00:13
31/05/2011 00:13
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suba
Unregistered
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suba
Unregistered
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LOL! I managed to get my coupe to handle as follows (with a lot of effort, and a lot of money): turn in hard with no power on (or lightly on the brakes to provoke it), rear end goes 'light' - point where you want to go before any real opposite lock is needed and power out to pull the car straight through the corner. (with a shade over 300bhp - so the rear will always follow the front when power is on) With the balance of the car and the power going through the front wheels it is very hard indeed to spin or oversteer when on the power, and understeer is inevitable. I hasten to add that these antics were all on track, I would not want to mess about as above on the road at 80mph.
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