SJ
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| posted on 12/7/15 at 09:09 AM |
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quote:
I tested the car yesterday, still no change unfortunately. I feel that passing IVA is going to be impossible and I have a very expensive pile of scrap
metal sitting in my garage.
Before you loose hope, have you driven anybody else's car to see how it centres?
When I built my MK it had no self centring and I got it through the SVA using springs in the rack, which is clearly a bodg and i removed them
afterwards. I subsequently modified my top wishbones and tested the car with upto 9 degrees of castor, and even that doesn't make it feel like a
production car.
Some will say this is because the MK chassis isn't rigid enough. That may be true, but it seems to me that most of these cars have some issues
with this.
I think you need to modify the top wishbones and then do whatever other bodges you need to get through the IVA.
On my tester the tester really only wanted the car to show some attempt to centre and wasn't too bothered how it actually steered.
Stu
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loggyboy
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| posted on 12/7/15 at 09:18 AM |
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Its more than just caster that needs to be checked/adjusted. The kingpin inclination (sai), wheel offset, camber can all have noticable affects.
Mistral Motorsport
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tony c
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| posted on 12/10/17 at 01:02 PM |
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fury - steering wont return to centre
Hi Steve
just noticed a very old text from you about self centering
Something worth trying - if your top wishbone has two sets of mounting holes onto the chassis, try mounting in the inner holes not the outer as this
alters the King pin inclination angle and will assist the self centering.
cheers
Tony
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jps
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| posted on 12/10/17 at 01:48 PM |
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Hope he hasn't gone 2 years without sorting it!
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zx12r dug
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| posted on 12/10/17 at 08:21 PM |
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I've gone through 5 iva test now 4 mks and 1 sonic7 uno turbo powered car have always got the steering somewhere near but just to help it
I've always fitted some valve springs inside the rack yeah it hinders your lock slightly but it certainly returns the steering wheel
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SteveDown
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| posted on 13/10/17 at 03:24 PM |
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All sorted thanks... got it through with the valve springs fitted, worked a treat.
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steve m
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| posted on 13/10/17 at 07:30 PM |
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Im intrigued how a valve spring can self centre a steering defect
as in my mind self centering will happen at any point, ie 5 or 10% off central (the spring is not any were near being touched)
and if self centering is required, it MUST be from any point in the steering, not only from lock to lock
or am I missing something here
steve
Thats was probably spelt wrong, or had some grammer, that the "grammer police have to have a moan at
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rusty nuts
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| posted on 13/10/17 at 08:30 PM |
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The car is tested on full lock , the steering wheel is then released and the car has to be seen to show at least some self centring or at least
that's how I remember it.
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zx12r dug
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| posted on 13/10/17 at 09:34 PM |
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Same here only tested full lock to lock yeah its not ideal but we do what we can to get that pass and number plate
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steve m
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| posted on 13/10/17 at 09:48 PM |
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Ok, noted
Thats was probably spelt wrong, or had some grammer, that the "grammer police have to have a moan at
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