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Author vid - can you spot something
SetH
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Registered: 15th Jul 01
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26th Oct 11 at 12:05   View User's Profile U2U Member Reply With Quote
You can also try dynamic corner weighting using a HEFFER. You position it in the back of the car and it rolls around from side to side as per Fee's instructions.

[Edited on 26-10-2011 by SetH]
Rob E
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26th Oct 11 at 12:13   View User's Profile U2U Member Reply With Quote
Here you go mate, by the looks of it though you have covered most aspects. It may point out something you could have possibly overlooked though.
Toby
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26th Oct 11 at 12:20   View Garage View User's Profile U2U Member Reply With Quote
It does look like the inside rear wheel slows but that could be due to the camera
Matt L
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26th Oct 11 at 12:25   View User's Profile U2U Member Reply With Quote
can i have the yellow leon please

also i can kinda see the wheel locking but i think its more camera trickery tbh i imagine it just just purely down to weight transfer after going up the hill.

[Edited on 26-10-2011 by Matt L]
AK
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26th Oct 11 at 12:36   View User's Profile U2U Member Reply With Quote
Seth - thats whats being done just now. We're off on hols so it'll be ready for a test on the 12th

Robin - not at the apex no. She'll be done with the gears by the time she turns in.
AK
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26th Oct 11 at 12:38   View User's Profile U2U Member Reply With Quote
Mattl - yup, thats the senario where it happens and you used to feel it spinning away the power with the old worn LSD.

Toby - to get round the corner in a nice neat manner the inner wheel should slow I think our problem is when 'any' power is introduced the diff plates lock and the rear wheels rotate at the same speed not allowing it to turn, just drift
Robin
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26th Oct 11 at 12:47   View Garage View User's Profile U2U Member Reply With Quote
That's what I thought but the only thing I could think of was that it was locking a wheel on a downshift :S

Do you have the original vid?
AK
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26th Oct 11 at 13:01   View User's Profile U2U Member Reply With Quote
nope, not my vid
SetH
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26th Oct 11 at 13:04   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by AK
Seth - thats whats being done just now. We're off on hols so it'll be ready for a test on the 12th

Robin - not at the apex no. She'll be done with the gears by the time she turns in.


LOLZ you are corner weighting with a HEFFER? In car PIcs/Vids or it never happened.
AK
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26th Oct 11 at 13:07   View User's Profile U2U Member Reply With Quote
no... the diff you fud
Mike GSi
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26th Oct 11 at 14:26   View User's Profile U2U Member Reply With Quote
This may sound cuntish but, is it possible that while fee was transfering her foot from brake to throttle she clipped the brake pedal. Would make sense on a hard right hander, with the G force pulling her foot to the left or towards the brake pedal.

That would explain the rear wheel locking up. But it wouldnt explain the problem you have with oversteer on exit. Does it happen with you driving?
AK
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26th Oct 11 at 14:45   View User's Profile U2U Member Reply With Quote
She isnt braking by mistake.

rear wheel locking up is (if it is) just because its in the air and prob slight brake friction/diff etc

G Force isnt enough to overcome leg muscles at this level... prob around 1.4 lateral on that corner with those tyres ('till the rear goes out )

It does it with me too.
Mike GSi
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26th Oct 11 at 15:01   View User's Profile U2U Member Reply With Quote
Ok, just a thought.

I'm still with diff locking to easy/early.
Rob B
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26th Oct 11 at 15:04   View User's Profile U2U Member Reply With Quote
I'm saying not enough rear shock extension/ rear to stiff.

1.5 or 2 way diff?

[Edited on 26-10-2011 by Rob B]
AK
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26th Oct 11 at 15:08   View User's Profile U2U Member Reply With Quote
the diff is customisable - 1way, 1.5, 2 way, locking speed, lock delay, rates, clamping force etc - waste of £2700 at the moment. We're in contact with Japan to try and get a definative setup for it when it left the factory. We can then adjust it - but we need to know where it is first.

Rear shock extension - yup, I agree BUT how do you get more extension without compromising compression travel?

Rear too stiff - we've tried softer (550lb) and its too soft. Its on 700lb just now. Rears. We need to do some proper tests with travel to see how much bump travel we have.
AK
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26th Oct 11 at 15:10   View User's Profile U2U Member Reply With Quote
the suspension has spring platform and strut body height adjustment... so you can raise/lower without altering spring preloads
Rob B
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26th Oct 11 at 15:10   View User's Profile U2U Member Reply With Quote
If you can be arsed to bring it down to Kidderminster we can measure bump steer on our alignment rig.

What makes the diff?

Edit: What sort of adjustment do you have left and what preload are you running at on the rear?

[Edited on 26-10-2011 by Rob B]
AK
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26th Oct 11 at 15:16   View User's Profile U2U Member Reply With Quote
Not going to take it down... already too many cooks

OS Giken X-Spec

Adjustment - what do you mean what do we have left? We arent max'd out on anything... so lots if you're just talking about heights etc.

BUT generally any extension we gain will come of the bump travel. We can prob gain about 25mm extension by extending the strut body to its max.

PreLoad - no exact measurement, but not a lot... spring wound up hand tight then a couple more turns with spanner... too to tight and the car then needs more (slower) rebound to keep it composed which in turn keeps the inside rear hanging longer
Rob B
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26th Oct 11 at 15:26   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by AK
Not going to take it down... already too many cooks

OS Giken X-Spec

Adjustment - what do you mean what do we have left? We arent max'd out on anything... so lots if you're just talking about heights etc.

BUT generally any extension we gain will come of the bump travel. We can prob gain about 25mm extension by extending the strut body to its max.

PreLoad - no exact measurement, but not a lot... spring wound up hand tight then a couple more turns with spanner... too to tight and the car then needs more (slower) rebound to keep it composed which in turn keeps the inside rear hanging longer


Sorry i ment ride height,

I'd try 0 preload on the rear springs but like you say sounds like to many people have messed with it.

Watching the video again and again it doesn't look like there is enough roll/pitch in the rear at all.
AK
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26th Oct 11 at 15:30   View User's Profile U2U Member Reply With Quote
thats with no rear arb connected too.

We need to just get a nice dry day to test things - been too hectic this year



[Edited on 26-10-2011 by AK]
Rob B
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26th Oct 11 at 15:36   View User's Profile U2U Member Reply With Quote
She good always adopt the stop and go approach

AK
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26th Oct 11 at 15:37   View User's Profile U2U Member Reply With Quote
.... thats slower
Rob B
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26th Oct 11 at 15:49   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by AK
.... thats slower


Has she tried it with Data?
AK
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26th Oct 11 at 15:50   View User's Profile U2U Member Reply With Quote
you dont need to... if dont accelerate till your straight and coast round corners its not going to be quick.
spikedjack
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26th Oct 11 at 15:56   View User's Profile U2U Member Reply With Quote
Doesnt seem to lift the inside rear as first thought

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