trackjunky

I just had a revelation about my alignment. I am using SMART strings to align my car and the chart documents 10ths of a degree while Porsche uses minutes.

Factory GT3 rear toe is 0 degrees 10 minutes + 5 minutes/-0 minutes (per side). I need to convert this into 10ths of a degree to use the SMART strings chart. I'm no math wiz but here it goes:

60 minutes in 1 degree so 10/60 = .1667
+5 minutes would be 15/60 or .25

So rear toe in would be .1667 to .25. Using the SMART strings chart and a measured wheel diameter of 19" I should be 3/64ths to 6/64ths of an inch. Right?

Larry Herman

Sounds right to me. I used to setup my GT3 with 3/32s toe-in on each side. Was very stable & didn't chew up the rear tires.

trackjunky

Interesting, that would be the factory maximum but my gut says that's where I need to be at. I'm at 3/64ths and it's not right. I think I have too little toe and when it squats under acceleration I go to toe out.

Bob Rouleau

Too little rear toe will also make the car wag its tail under hard braking.

MTosi

For a second I though I was posting over on the long range shooting boards... (Minutes or MOA are what we use to factor wind/elevation, etc.) Looks correct to me, although I'm used to going from Minutes to Mils and vice versa.

ltc

Download Convert.exe (yes, it's safe for downloading).
Very handy utility to have on your PC.

http://wscope.com/convert.htm

Larry Herman

Thanks Lewis. I had something like that on my old iMac, and always wanted one for my PCs.

mglobe

Bill you better check your units and see if you are supposed to be using metric degrees or not.

trackjunky

OK, I'm biting, what's the difference?

Larry Herman

Hey Bill, I have a few metric adjustable wrenches for sale if you need any.

mark kibort

on a 19" diameter, you can take the inches off parallel, and divide by the 19" diameter. just use a calculator and take that number and hit the INV TAN function. .5" is about 1.5degrees as you might find by looking at camber.
1/8" on toe, .125/19" Then use INV TAN, you will get .37 degrees or 22mins

trackjunky

Sorry. I just spent some money on a whole set of left handed screw drivers.

I'm saving up for some "L" bracket. All I have left are brackets shaped like "7's".

trackjunky

Mark, thanks for the info. My brain hurt after reading that. Two glasses of Scotch and now I feel mutch butter. Camp't understnf whatcha' talkin bout.

Larry Herman

Funny you mention that. I have a whole bunch of 7 brackets too, but when I put them in a box and shake it really hard, sometimes a few change into L brackets! Try it and see if it works for you.

Veloce Raptor

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