#1
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Corner weights of a 1303
Anyone have any idea how heavy each corner of a stock 1303 is? I'm trying to work out spring rates and don't have a gauge....
Ta Andy |
#2
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I had my car weighed when I got my T4 engine tuned up a couple of years ago. Its a 1973 1303. With me sat in it it weighed 939kg, and the following at each wheel:
Front left 200kg Front Right 213kg Rear left 246kg Rear right 279kg
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fastbug.net | FastTrack Dub Club "Straights are the boring bits that link corners together" |
#3
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Excellent, thanks for that. Surprising isn't it really. That's not as much difference as you'd expect front to rear. Will we see your car on track this year?
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#4
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Yeah, it is. I have the battery in the front wheel well which helps. On average its a 44/56 split, front and rear, thats supercar territory..
Hopefully on the road, but probably not the track this year, maybe next.. Chris
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fastbug.net | FastTrack Dub Club "Straights are the boring bits that link corners together" |
#5
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Hi Chris
Is your car adjustable in the corner weights? Having the corner weights correct can really make difference to a cars behaviour. I want to have my corner weights correct in my next car, Im on the lookout for a cheap way to do this. I've thought about making a hydraulic apparatus that could lift each wheel, I could then read the hydraulic pressure needed to lift the car at each corner. It wouldn't give me kilograms per corner like you have, but I could compare oranges to oranges, but the kilograms per corner could be worked out if I knew total weight of the car. Steve
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STI powered 1303 in the works. |
#6
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As I have adjustable struts, the wheel pressures could be modified by adjusting the strut height I expect.
What about using heavy duty scales, and just weigh one wheel at a time, adjusting them until they're even?
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fastbug.net | FastTrack Dub Club "Straights are the boring bits that link corners together" |
#7
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Hi Chris
Proper race teams have pressure pads that they drive cars onto, these are out of the price rangfe of the average enthusiat. I imagine getting the car onto a scale would upset the suspension. what I was thinking with my hydraulic apparatus was I would drive the car and place it on 4 pieces of thin but tough piece of plastic, i would then lift each wheel in turn until the plastic sheet could just be moved and make a note of the pressure reading at each corner. There is software available to calculate corner weight results. To get your corner weights right you would need to adjust the rear torsion bars as well, that would be pain unless you had adjustable spring plates or unless you ran coil springs all round like andy1303 is doing. Steve
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STI powered 1303 in the works. |
#8
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Hi
Just found some software to do corner weights, I used weights that Chris posted. Steve
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STI powered 1303 in the works. Last edited by Steve C; May 1st 2007 at 22:20. |
#9
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Quote:
Instead of purchasing such a scale, simply contact a local shipping/freight company and see if they have such a thing. If not then your local Co-Op should, since they have to have some way to weigh their grain trucks. If MacGyver could build a nuclear powered submarine out of a waterbong, a paperclip and a ball point pen, then this should be easy. |
#10
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Hi AggieDave
Your idea would work in a fashion. What I was getting at by upsetting the suspension is, as we all know the suspension will slightly tuck under during lifting and the only way to settle it back to the correct ride height is to move the car, this tuck would raise the suspension throwing out fine corner weight measurements. Steve
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STI powered 1303 in the works. |
#11
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Get one scales and 3 dummy scales. Drive the car onto the 4 items, measure. Drive off, swap the scales around, drive on. K.I.S.S
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fastbug.net | FastTrack Dub Club "Straights are the boring bits that link corners together" |
#12
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your car and scales need to be on a perfectly( or near to it) level surface. otherwise you will get incorect readings, theres no way around it period.
You can use adjustments for ride height to shift weight and you can also simply use dead weight (such as lead) to do the same. its all a balancing act. with adjustable 944 spring plates you can do a lot. the goal is to get your cross weights near 50%
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FULL SPEED AHEAD, HARD AND FAST! Current cars: -74 Super Beetle -86 Vanagon Syncro -64 sunroof bug -73 thing |
#13
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Quote:
So all the measuring, weighing, knowledge and skill about suspension on the mechanics side is tossed out by the worlds finest judge...the driver's butt. |
#14
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There are cheaper corner weight gauges available which use a lever assembly that hooks under the top of the wheel rim. push to lever down to lift the car and then the gauge shows the weight.
http://www.merlinmotorsport.co.uk/SU...325/index.html but I decided I couldn't afford it.... |
#15
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Much cheaper to just go somewhere (like http://www.raceshack.co.uk) and borrow their corner weight scales.
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fastbug.net | FastTrack Dub Club "Straights are the boring bits that link corners together" |
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