Front suspension issue: uneven grip

[Loco_Mario_PL]

I recently had MOT test done. To my surprise, there are differences in my front suspension:

LEFT side: grip 66%, 13 Hz frequency,

RIGHT side: 78%, 11 Hz frequency.

(left and right sides from the position of a driver, of course)

Rear seems ok, RIGHT and LEFT sides: 74%, frequency 13 Hz.

We repeated the test with different shock absorber settings (soft vs hard). Results even worse.

Why is the diffrence in front suspension ?

I measured the coil springs lenght and found differences (picture). Also, the length of coils vary.

This has been a factory setting, I haven't fiddled with the coils so far.

Any thoughts on that ?

(excuse me if my English terms are not the exact as they should be)

[Bruce Fielding]

Might be that it's been corner weighted to allow for the weight of the driver...

See here for an explanation: http://robrobinette.com/corner_weight.htm (other explanations are available)

Did you check with and without a driver?

[Loco_Mario_PL]

Checked with with a driver (me). Difference even worse.

[benyeats]

[quote="Loco_Mario_PL"]
Checked with with a driver (me). Difference even worse.
[/quote]

Was your car a UK car / ambi chassis car so may be set up for a driver sitting on the right side of the car?

[ChuckUK]

Mine is set up like this, as it's RHD I've always assumed out of the factory they allow for the driver.

[smokin]

hmmm I'd expect the preloads to be the same on the springs and the pushrods used to balance - but I'm no expert

[smokin]

Check this out

http://www.startline.org.uk/slol65/corners/cornerweights.htm