THSCC Forums

All this stuff is interesting & I'm learning a lot, but my brain is almost at the point where it will automatically switch to thinking about boobies.

Just lost my train of thought ...

_________________
Has no responsibility whatsoever.

Mmmmm....boobies....


--Donnie

Ordered Puhn, ordered the _Race and Rally Car Sourcebook_ by Staniforth, ordered _Car Suspension at Work_ by Daniels, and ordered _High-Performance Handling Handbook_ by Alexander. Already have the Smith books, the other Staniforth (obviously, I quoted it already), and a couple more that are currently MIA. For driving I also recommend the Skip Barber book _Going Faster!_. Another recommendation for general visualization was recommended to me by Eric Peterson..._Thinking Body, Dancing Mind_. You can probably find it at a local bookstore to thumb through to see if it is your cup of tea or not.

I'm down with that! Too bad I don't know nuthin!


--Donnie

So that's what Eric is doing when I see him squirming and wiggling with his eyes closed before events.

Shawn

_________________
OK so I'm back in. Now which tire should I buy??

lifting throttle, rotating spyder...

_________________
www.ncvw.org
1993 VW Corrado VR6 - DSP15 (RIP)
1986 MB 190E 2.3L 16v - STX (SOLD)
1997 BMW M3 3.2L - BS for now

Hey, thanks guys! Now *I* know what he's doing, too!

I thought a bee was chasing him.


--Donnie

It was my original question but even I don't care. Heh heh,heh heh,heh heh, he said boobies.

_________________
2003 Matrix XRS notaminivan
2004 Subaru WRX #38
2000 Rally Focus
2007 Honda NFR S2000

Aaaaaaalrighty then.......

----------------------------------------

-1.0 static camber at 0 bump (stock)

SusProg3D Subaru.s3d Front Roll and bump

Chassis roll values calculated every 1.00 degrees. Right hand turn.
Semi dynamic roll centre. Roll starts at 0.787 bump.

Outer wheel (LH) roll centre
camber caster kpi scrub tramp toein offset height fvsax
0.00 roll -1.68 5.18 15.000 0.129 0.011 0.000 0.000 3.586 70.413
1.00 roll -1.06 5.28 14.358 0.123 0.018 0.000 -5.203 3.447 75.677
2.00 roll -0.41 5.37 13.686 0.108 0.025 0.001 -10.530 3.022 82.382
3.00 roll 0.27 5.48 12.981 0.087 0.033 0.003 -16.115 2.287 91.219
4.00 roll 0.98 5.59 12.240 0.065 0.040 0.007 -22.126 1.199 103.397
5.00 roll 1.74 5.70 11.461 0.049 0.047 0.012 -28.782 -0.316 121.248
6.00 roll 2.53 5.83 10.639 0.045 0.054 0.020 -36.402 -2.376 149.933
7.00 roll 3.36 5.96 9.771 0.061 0.061 0.031 -45.479 -5.172 203.574
8.00 roll 4.25 6.10 8.850 0.109 0.068 0.046 -56.835 -9.033 339.694

--------------------------------------------

-2.5 static camber at 0 bump (mine)

SusProg3D Subaru.s3d Front Roll and bump

Chassis roll values calculated every 1.00 degrees. Right hand turn.
Semi dynamic roll centre. Roll starts at 0.787 bump.
Toe variation has NOT been calculated.

Outer wheel (LH) roll centre
camber caster kpi scrub tramp toein offset height fvsax
0.00 roll -3.23 5.18 16.569 0.141 0.010 0.000 0.000 4.013 64.762
1.00 roll -2.65 5.27 15.964 0.135 0.017 0.000 -4.529 3.895 68.804
2.00 roll -2.04 5.36 15.330 0.120 0.025 0.000 -9.144 3.534 73.804
3.00 roll -1.40 5.46 14.667 0.098 0.032 0.000 -13.940 2.914 80.152
4.00 roll -0.73 5.57 13.970 0.075 0.041 0.000 -19.025 2.003 88.484
5.00 roll -0.02 5.69 13.237 0.054 0.049 0.000 -24.544 0.754 99.907
6.00 roll 0.72 5.81 12.465 0.040 0.058 0.000 -30.693 -0.912 116.534
7.00 roll 1.51 5.94 11.648 0.040 0.068 0.000 -37.760 -3.113 142.968
8.00 roll 2.34 6.08 10.783 0.063 0.079 0.000 -46.191 -6.043 191.494

------------------------------------------------

See what happens when you lower the car too much?? -2 inch "drop dawg" same -1.0 static camber at 0 bump

usProg3D Subaru.s3d Front Roll and bump

Chassis roll values calculated every 1.00 degrees. Right hand turn.
Semi dynamic roll centre. Roll starts at 0.787 bump.
Toe variation has NOT been calculated.

Outer wheel (LH) roll centre
camber caster kpi scrub tramp toein offset height fvsax
0.00 roll -1.40 5.21 14.593 -0.027 0.013 0.000 0.000 -2.021 128.968
1.00 roll -0.59 5.32 13.753 -0.035 0.022 0.000 11.605 -1.685 162.833
2.00 roll 0.27 5.44 12.863 -0.065 0.031 0.000 22.339 -0.725 230.710
3.00 roll 1.18 5.57 11.918 -0.129 0.041 0.000 31.526 0.730 434.440
4.00 roll 2.15 5.71 10.910 -0.238 0.051 0.000 38.804 2.516140786.480
5.00 roll 3.19 5.86 9.831 -0.397 0.063 0.000 44.120 4.467 -385.916
6.00 roll 4.30 6.02 8.674 -0.612 0.075 0.000 47.643 6.453 -180.496
7.00 roll 5.50 6.19 7.430 -0.884 0.087 0.000 49.655 8.381 -112.453
8.00 roll 6.80 6.38 6.088 -1.214 0.101 0.000 50.472 10.199 -78.707

------------------------------------------------

My conclusion from 2 minutes of number crunching??

My car runs a static -2.5 camber. With that and a bigass front bar and a lot of front spring, the wheel is perfectly damn level at the middle of the turn with full load. The tire temps as well as many pictures prove that. I assume then, that you I'm encountering maybe 5 degrees of roll.

A stock car would probably get closer to 8

-Tom

Boobies

Please take all these numbers with a BIGASS grain of salt

They are not from exact measured numbers. They are from an ESTIMATION of a front suspension which *looks* right.

Static, 0 pitch,yaw,roll


Static, 45 pitch, 0 yaw,roll


-Tom

Tom,

FYI you can get a feel for the sensitivity of the results to any errors in your measurements by entering slightly (1/4 to 1/2 inch) different numbers for one (at a time) of the hard to measure points and see what happens.

Does the program have a way of estimating the roll angle for a given cornering g's load? I've got a combination of old obsolete software packages that has given me some data that seems reasonable for my FF. It would be nice to use something new like either current Mitchell stuff or the SusProg 3D if it integrates everything in one package.

By the way, at about 1.3 g my FF rolls about 1 to 1.5 degree as I recall.

_________________
Dick Rasmussen

FS 50 2018 Mustang GT

Wow, thanks.

_________________
2003 Matrix XRS notaminivan
2004 Subaru WRX #38
2000 Rally Focus
2007 Honda NFR S2000