[eurocarnut9xx]

The braking system model I was working on is ready to share. It is an Excel spreadsheet that allows the user to ‘build’ a braking system and then make comparisons of the results. This allows you to see on paper what modificaions to your brakes, tires, and chassis (weight, height) will do.



Examples of what you can evaluate are:

-How much of your traction budget you’re using on the front and rear tires

-Which will lock up first? Front or rear?

-Stopping distance

-Rates of deceleration



It is still under development, so please provide feedback.

-What other reports are of interest?

-What other parameters should be variable or accounted for?

-Do you have any general suggestions?



A link to the calculator is provide below. The file doesn't open in the browser so you'll have to download it first. To download it, click on the '(i)' on the far right of the file's row. Then on the right side of the page, click 'Download' to get the file.



Thanks in advance, and enjoy!



https://skydrive.live.com/redir.aspx?cid...DC617D!182

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[Rap]

Having just completed a two day driving clinic that spent a fair amount of time on the ins and outs of braking I would be interested in your results. They had us do things that I was not aware could be done. Mind you some ignorance on my part. Regarding locking up. I presume you are including abs in these models. I don't know whether all 968 came with this feature. Mine did. I have never been a fan. My eyes were opened!

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[eurocarnut9xx]

Deceleration and Stopping Distance – These are based on the both front and rear braking functions concurrently, and thus provide the ‘best’ values at the limit of the tire’s friction capability (i.e. right before lock or, on the ABS).



Tire Utilization – This is reported independent of the other set of tires (front or rear), thus showing what each set will do at a given rate of deceleration. The first set to exceed 100% looses traction and locks-up (hence the chart being limited to 100%). After one set of tires lock-up (or goes on ABS), it is undetermined whether the other set will reach its maximum deceleration rate as the model does not account for ABS in this instance.



Rear Tire vs. Brake – Simply shows the ratio of rear tire friction to total friction vs. the ratio of rear braking force to total braking force (rear bias). Stated another way, it is the rear friction bias vs. the rear braking bias. As these are both ratios and are not related and scaled by their quantified forces, they cannot be used to determine when or if tire lock will occur. The tire utilization report may be used for this.



I hope this helps!

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[Rap]

I fear I am not as technically adept as you. We ran braking runs at 20, 50 percent braking and abs engage at different speeds into boxes within boxes using cones and abrupt lane change 90 degree turns and then back into the lane. Sort of like slamming on your brakes and braking around a stopped vehicle and continuing to drive. I did this in a front wheel drive Malibu and my 968

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