Daddylonglegs
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| posted on 15/5/12 at 01:28 PM |
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IVA Test
Well, had the DVLA inspection today, got my VIN number  . Chap asked loads of questions about receipts for steel for the chassis, engine gearbox etc.
but i told him i wasn't bothered about an age-related plate and 'Q' was fine.
So now going to download the application for the IVA and get it sent off.
I may have a couple of questions yet but I will see when I start filling it in. As far as I can remember from searching around, the main thing is the
VIN, axle weights and test centre? for the axle weights I got a rough weight from each wheel using some cheapo scales (which weren't too
impressed! - especially as I am running a 2L Pinto  ), and put the values in one of the many excel spreadsheets to calculate weight ditribution etc.
and it came back with the following:
Front axle: 390kg
Rear axle: 255kg
Total weight: 645kg
Front/Rear split: 60% / 40%
Does that sound reasonable for a Live axle McSorley +442 (4" wider, 4" longer and 2" higher)?
I am a little concerned as I always thought it was besat to have a 50/50 split front to rear?
Anyhow, I was going to put 500kg front and 450kg rear, thoughts guys?
JB
It looks like the Midget is winning at the moment......
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loggyboy
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| posted on 15/5/12 at 01:38 PM |
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You had to use a speadsheet to add 4 figures together?!??
Mistral Motorsport
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Daddylonglegs
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| posted on 15/5/12 at 02:08 PM |
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quote:
Originally posted by loggyboy
You had to use a speadsheet to add 4 figures together?!??
No, I had to use the spreadsheet because it works out the x-balance and whether you need to raise or lower the ride height to get the balance! Plus it
is much quicker than fannying around with maths! 
[Edited on 15/5/12 by Daddylonglegs]
It looks like the Midget is winning at the moment......
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loggyboy
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| posted on 15/5/12 at 02:28 PM |
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Fair enough,
But to respond to your question, yes a 50/50 split is ideal, but its hard to achieve, especailly when you running a pinto, or most car engines TBH.
Its not essential, you can balance the handling with well setup geometry and shock/spring weights.
Mistral Motorsport
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Daddylonglegs
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| posted on 15/5/12 at 02:39 PM |
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I did wonder if I wound a little more spring on the rear shocks to give a little more ride height and poundage on the rear axle?
It looks like the Midget is winning at the moment......
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adithorp
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| posted on 15/5/12 at 02:53 PM |
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For the IVA form the weights required are the "maximum design weights". In other words the max that each axle is designed to carry
including passengers and luggage. The inspectors will weigh the car then add a fixed amount for passengers and luggageper seat and your declared
values must be higher than that. In the case of most sevens that'd be 500kg on each axle.
As for adjusting... Altering the spring platform heights (or the actual springs will only alter the ride height and corner weight. It will NOT alter
the front to rear or left to right balance; Only physically moving or adding weight within the car can do that.
Did you set the corner weights with you in the car? In a light car you form a significant part of the mass so it should be done with you (or an
equivelent weight) in the seat.
"A witty saying proves nothing" Voltaire
http://jpsc.org.uk/forum/
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