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Discussion Starter #1 (Edited)
I had a machinist friend make some 4 to 1 ratio metal jigs so i could use bathroom scales to weigh for corner balance. It works pretty good $100 in metal with bathroom scales was alot better than $1000 for digital scales

anyone charlotte is welcome to borrow mine :)

This is my results with me in car and half tank of gas

STOCK
LF 1128 RF 932
LR 716 RR 832
cross 1960 VS 1648
312 lbs differance

AFTER
LF 1040 RF 980
LR 800 RR 744
cross 1784 vs 1780
4lbs differance

total wieght is 3533 w/driver & half tank of gas

front 56%
rear 44%

is this correct weight distribution? should i adjust it more?
thanks
Jay
 

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That is a cool idea. I have thought about using bathroom scales but I knew they wouldn't stand the weight. Any pics of the rig would be appreciated.

What changes did you make to the car to get the weight changes?
 

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front 56%
rear 44%

is this correct weight distribution? should i adjust it more?
thanks
Jay
Ummm, you can't adjust F/R weight distribution without physically moving weight from the front to the back.

At least without reversing the laws of physics. :)

DaveW
 

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Discussion Starter #4 (Edited)

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That's cool. I know I saw that approach in the Mathis book. But I didn't think it would work that well-- images of broken scales kept popping in my head.

Out of curiousity, does your suspension setup allow you to adjust that cross-weight. I'm of the understanding that it should be almost equal. Maybe I'm wrong. *Edit* Nevermind, If I wasn't such a non-observing idiot, I would have noticed the after weights not just the stock weights. D'OH!

jaysch302 said:
anyone charlotte is welcome to borrow mine :)
I may take you up on that offer. :) I was planning to corner-weight mine after I change the rear springs. It probably won't be til late January, though.
 

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Hey Jay,
You missed some serious track time at VIR last month with the Porsche guys!
The car ran great. After I installed my coil-over kit, I had my car corner weighted based on your ride heights.

3495 lbs with driver and 1/2 tank of fuel.
LF 1015 RF 964
LR 779 RR 736
1743 1751
49.9% 50.1%
Rob
 

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While it wont change weight percentages, does your calculations include the weight of the jigs for the overall weights?
 

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Discussion Starter #10
Rob glad to hear car ran good! do have any video of it? I have heard the Porsche clubs have tons of track time. How did your car compare to the porsches? what kind of times were you running? I wanted to run there but i need a clutch still. I hope to run there with nasa midatlantic in Feb 18,19 at VIR. unless porsche club has something going on, which is better porsche club or nasa?

The jigs are 8lbs each and 4:1 ratio 28inch is where the end of the scale and pegs go then tire sits centerlined at 21" from scales.

The biggest headache is getting the scale level both ways and making sure each scale is equal with each other. I am going to use a laser level next time.

I notice now that the car turns right good but has oversteer on right hand turn and understeer on lefts. I think i may need to redo it with the laser level.

Jay
 

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Jay,

I was turning 2:19's with no traffic on the full course. My car was chewing up most of the porsche's in the turns and under braking, but the 911 Turbo's and the Cup Cars were walking me in the Straights. Alot of drivers were suprised with how well my car handled and were very curious with my set-up.

The PCA events are much, much better then the NASA events. They are tough to get into if you don't have a Porsche. It is worth the hassle though. They have tons of track time, there is a dinner on Sat night and there are very few incidents because most of them know how to drive. Randy and I do the PCA event in April. I will give you a heads up when registration will open.

Rob
 

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Dredging this back up from the dead because I bought a set of these off ebay. Here is a link to the guys web site that made the set I bought. http://madone.net/ The scales are cheap but it all seemed to work fine. I may replace the scales with digitals later.

Made an Excel spreadsheet to do some of the conversions if anyone wants it. Right click HERE and save as.

My car is awful and not much I can do about it right now but I wanted to know where it was before I started changing stuff.

ACTUAL WEIGHTS
LF RF
1108 968
LR RR
804 792

TOTAL WEIGHT
3672

LEFT SIDE RIGHT SIDE
1912 1760
52.07% 47.93%

FRONT WEIGHT
2076
56.54%

REAR WEIGHT
1596
43.46%
 

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Han Solo-

What you want to work on is equalizing the diagonals. They look to be about 51.7% LF/RR and 48.3% RF/LR.

Even w/o coil overs or other adjustable perches, you could try an 1/8" spring shim and see what it gets you. It is a PITA, but cheap.
 
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