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corner balancing needed?

L

leeshephard

Trainee
Joined
11 Jan 2009
Messages
86
Hi There

A little while ago I bought the lowering spring kit (M033?) from a main dealer as it was mega cheap (springs and dampers circa £250 I think) . Anyway me and my brother (who is a mechanic) fitted them and then I went to Tognola in Datchet and got an alignment done (£180). The car was on standard springs and dampers before so I am wondering if I need to check the ride height and corner weighting now? We matched up the spring perches when we swapped over the dampers but did not measure anything. I haven't got the cash at the moment to go and see Chris at CofG otherwise I would.

Any one done this or know what to check after installing the lowering springs?

Cheers

Lee
 
If I had a car with adjustable platforms I would consider getting it corner-weighted part of the basic setting up.

MC
 
How does it drive :dont know: Have you set the ride height before the geo? If the geo is not picking anything up and it drives straight and true it should be ok.

Corner weighting is more for the track
 
With only the front shocks height adjustable on the 033, a corner balance could make the car appear lopsided especially on a RHD. (That's what
I was told when I asked at Parr, long time ago)
Who the hell wants wonky?
 
Ah ok - but I thought the cars were balanced before leaving the factory? am i wrong? The Adrian Steather book 'King of Porsche' has a section on corner weights stating 20% for each front wheel and 30% for rears, with no more than 20KG difference between axles. It appears to be taken from the workshop manual....
 
Corner weights are always done to match them diagonally. It is the only way to do it.

MC
 
leeshephard said:
Ah ok - but I thought the cars were balanced before leaving the factory? am i wrong? The Adrian Steather book 'King of Porsche' has a section on corner weights stating 20% for each front wheel and 30% for rears, with no more than 20KG difference between axles. It appears to be taken from the workshop manual....
Click to expand...

When you install new adjustable-height spring/damper units (so-called "coil-overs"), the corner weighting has to be redone to compensate for possible variations in the effective compressed lengths of the springs when the car is standing on its own wheels.
 
leeshephard said:
so you are saying that I should check the ride height and corner weighting?
Click to expand...

I'm not sure you can corner weight as you will need fully adjustable coilovers, M030 and lowering springs are a fixed ride height?
 
smj996c said:
leeshephard said:
so you are saying that I should check the ride height and corner weighting?
Click to expand...

I'm not sure you can corner weight as you will need fully adjustable coilovers, M030 and lowering springs are a fixed ride height?
Click to expand...

OP thinks he has M033, not M030? Not familiar with the M033 kit, so I don't know if the dampers have adjustable-height spring perches or not. :dont know:

@ leeshephard: If your dampers allow the spring perch positions to be adjusted, then it would be possible to adjust ride height and then fine-town corner weighting. If not, then those two characteristics are what they are.
 
Save up Lee until you have enough cash then go see Chris, pay once and get the job done right, cheaper in the long run and much better results guaranteed :thumb:

I'm off to see Chris in a couple of weeks to get the GT3 fettled, can't wait :D
 
Yes - it is looking like I may need to go to see Chris after all. As stated previously, the font Munroe shocks are adjustable so some balancing is possible. Thanks for all the answers!
 
The rear shocks have 3 different shim thicknesses available depending on the markings on the springs (1, 2 or 3 marks)

The front shocks are adjustable by rotation of the threaded portion on which the spring sits.

Maximum differential between the front and rear shocks is 10mm

So you can theoretically adjust the corner weighting on the original suspension but only by adjustment of the front dampers and working within the measurements specified by the Porsche manual. The corner weighting should not exceed 20kg according to spec.
 

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and here are the suspension settings for the 993 so you can check with a measure at the datum points on a flat level surface to see how close you are to where you need to be. Hope that helps if you are trying to set-up as an interim measure until a visit to CoG.
 

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