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Craig 930 RS's Avatar
 
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BY your description, its *has* to be alignment as opposed to torsion rates etc
I think you'll find it out pretty quick -

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Movie: 930 on the dyno
Old 01-06-2009, 12:53 PM
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FYI: positive toe measurements = toe in, negative = toe out.
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Old 01-06-2009, 03:56 PM
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Also, what tire pressures are you running? Too high or too low pressures can contribute to what you're describing.
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'01 996, w/ LN IMS!

Past: '96 993, '98 986, '82 911, '99 986, '87 930, '86 951, '85 911 GTS3 race car
Old 01-06-2009, 03:59 PM
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On the camber front, before you start changing things, you should get a pyrometer and take some real tire temp and go from there.

I am running just a touch more negative F/R than you, which sounds insufficient. But when I took tire temp, I'm getting <10deg difference between inside & outside. So, my mechanic & I decided to not mug around with camber.

I also understand different tires like different cambers, so again - take some temp first.
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Old 01-07-2009, 05:49 AM
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Quote:
Originally Posted by TroyN View Post
FYI: positive toe measurements = toe in, negative = toe out.
I think you have it backwards, I have always seen positive toe referred as toe out.
Negative values are toe in.
This is because toe is always the difference between the measurement across the front edges of the tires minus the rear edges distance. If the value is negative the front edge distance is less than the rear.
Another way of looking at it is when looking down on the car as if standing on the roof and facing the direction of travel, the front edges of the tire will be turned towards the center of the car by the angle specified as the toe angle, forming a vee shape more or less.
That is why it is better to give more details about what was measured when talking numbers.
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Old 01-07-2009, 07:14 AM
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I agree we don't know for sure whether the OP's measurements are toe in or out, but I've experimented quite a bit w/ alignments and positive toe = in. Not that Wikipedia is the be-all-end-all but it's generally right about a lot of things.

http://en.wikipedia.org/wiki/Toe_(automotive)
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Old 01-07-2009, 10:04 AM
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Hi guys- I went back and looked at the alignment sheet and those numbers look like positive .15* for the left front and .14* for the right front. Toe in the rear says .12* for both. If I remember correctly the tire pressure was set at 29 psi cold and hot pressures went to 37psi. No pyrometer readings taken. It was a DE event at RA last September held by the BMW club. Should of taken readings for reference but like I said it was more of a shake down run for the motor set-up. Didn't think the suspension would be an issue. Motors perfect, handling's not. Thanks-Jeff
Old 01-08-2009, 07:20 AM
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Hang tight, I'll give you my exact alignment specs -
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"930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe
Movie: 930 on the dyno
Old 01-08-2009, 08:01 AM
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Craig 930 RS's Avatar
 
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2.0 degrees negative camber FRONT
2.9 degrees negative camber REAR


5.5 degrees caster FRONT

0 degrees toe FRONT
.12 degrees toe REAR
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- Craig 3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ -
"930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe
Movie: 930 on the dyno
Old 01-08-2009, 10:16 AM
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Craig- Thanks for digging up those settings. They work well for your car? I will definitely make changes to the toe and put a bit more negative camber all the way around. Loved the vette video. Jeff
Old 01-08-2009, 10:55 AM
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Really well. Super stable- as long as the road has no significant crown to it and the road ruts aren't bad.
Otherwise, the hugely wide (275/315) tires really follow the road .... sometimes rather scary ;-)

I'd guesstimate getting rid of that toe will help a lot.
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- Craig 3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ -
"930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe
Movie: 930 on the dyno
Old 01-08-2009, 11:11 AM
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Craig, to clarify, is your rear toe measurement total across both sides, i.e. .06 each? I need a realignment so may try your settings but not so aggressive on camber since I will not track this car.
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Old 01-11-2009, 07:20 PM
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Craig 930 RS's Avatar
 
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Toe Rear: .12 each side. .25 total says the alignment sheet
Camber: For street I'd go 1.0 front, 1.5 rear - negative camber

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- Craig 3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ -
"930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe
Movie: 930 on the dyno
Old 01-12-2009, 10:39 AM
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