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> 914 Track Suspension, Torsion Bar & Springs
J P Stein
post Dec 2 2007, 07:06 PM
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Excessive scrub radius......BTDT and pushed. No amount of suspension tuning will get it out but will increase oversteer on wide corners. It the tighter stuff...most autocross corners, you need so much steering lock that the tire actually gets out ahead of the ground/strut center interface making the tire shuffle sideways. I replaced my 10 inch wide fronts with 8 inchers ...a 1 inch reduction in scrub (no other changes except new tires for the wheels) and now the front end bites. There ya go, a freebie that took me over a year of misery to finger out.

The other solution is wheels with 1 inch more backspace.....which won't fit as the strut gets in the way. (IMG:style_emoticons/default/headbang.gif)
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drgchapman
post Dec 2 2007, 07:34 PM
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QUOTE(J P Stein @ Dec 2 2007, 05:06 PM) *

Excessive scrub radius......BTDT and pushed. No amount of suspension tuning will get it out but will increase oversteer on wide corners. It the tighter stuff...most autocross corners, you need so much steering lock that the tire actually gets out ahead of the ground/strut center interface making the tire shuffle sideways. I replaced my 10 inch wide fronts with 8 inchers ...a 1 inch reduction in scrub (no other changes except new tires for the wheels) and now the front end bites. There ya go, a freebie that took me over a year of misery to finger out.

The other solution is wheels with 1 inch more backspace.....which won't fit as the strut gets in the way. (IMG:style_emoticons/default/headbang.gif)


YUP. (IMG:style_emoticons/default/agree.gif)
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davec
post Dec 9 2007, 09:10 PM
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Also BTDT. Now running 400lbs up front, 300lbs in the rear. Got rid of the rear sway bar. It is not needed. For reference, I am 2200lbs wet, have 10.5 inch slicks and coil overs all around, 300hp, custom valved bilsteins. Never got good response from the Koni's. I turn a solid low 62 seconds at LRP.
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sww914
post Dec 30 2007, 06:25 PM
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Where's the good deal on rear coil over sleeves and tops?
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J P Stein
post Dec 30 2007, 07:42 PM
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Coleman Racing has a decent price. It takes a bit of fooling with them to get the fit right. They need your shock tube OD.
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dougcoup
post Jan 13 2008, 02:23 PM
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I have a lighter car it appears than those posted 1865lbs. with 2.8ltr.
10" slicks. for track not ax. I have coil overs all the way around and rear and front sways (stock).

Spring rates not writen on springs when I purchased set up but I would say in the 350 F to 500 rear based on beefyness compared to my 911 springs.

I took out the front torsion bar. I found no difference.

Has anyone else done this?
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J P Stein
post Jan 13 2008, 10:15 PM
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QUOTE(dougcoup @ Jan 13 2008, 12:23 PM) *

I have a lighter car it appears than those posted 1865lbs. with 2.8ltr.



Mine is at 1724 before ballast to 1781.....strictly an AX car tho.
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bumble
post Jan 14 2008, 06:37 AM
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I found the following to be near perfect:

23mm torsion bars
22mm front sway bar

300lb rear springs
no rear sway bar

Poly Bronze bushes throughout
monoball top mounts

3.2 Carrera struts with raised spindles

Very stiff chassis - full roll cage tied into the rear shock turrets, chassis stiffeners etc.

Koni sport shocks.

2.7L engine (~180 RWHP). Quaife Torsen diff.

This setup is extremely sensitive to sway bar settings - 1/4 inch either way is quite noticeable. Konis are the weak link - soon to be replaced with custom built Proflex shocks.

Cheers,

Mark.
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dougcoup
post Jan 17 2008, 07:08 AM
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jp
do you really need to run torsion bars with coil overs?


QUOTE(J P Stein @ Jan 13 2008, 08:15 PM) *

QUOTE(dougcoup @ Jan 13 2008, 12:23 PM) *

I have a lighter car it appears than those posted 1865lbs. with 2.8ltr.



Mine is at 1724 before ballast to 1781.....strictly an AX car tho.
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J P Stein
post Jan 17 2008, 12:20 PM
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Well.....I don't run coil overs, but I would think T bars would be redundant with the coilovers in place.
Since you noticed no difference, your T bars may have not been under tension....the adjustment screws backed off....which makes some sense, but not much.(IMG:style_emoticons/default/biggrin.gif)
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SirAndy
post Jan 17 2008, 04:19 PM
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QUOTE(J P Stein @ Jan 17 2008, 10:20 AM) *

Well.....I don't run coil overs, but I would think T bars would be redundant. with the coilovers in place.

(IMG:style_emoticons/default/agree.gif) seems like you would want to eliminate the guesswork for the T-Bars out of the equation ...

(IMG:style_emoticons/default/driving.gif) Andy
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PeeGreen 914
post Jan 17 2008, 06:02 PM
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QUOTE(bumble @ Jan 14 2008, 04:37 AM) *

I found the following to be near perfect:

23mm torsion bars
22mm front sway bar

300lb rear springs
no rear sway bar

Poly Bronze bushes throughout
monoball top mounts

3.2 Carrera struts with raised spindles

Very stiff chassis - full roll cage tied into the rear shock turrets, chassis stiffeners etc.

Koni sport shocks.

2.7L engine (~180 RWHP). Quaife Torsen diff.

This setup is extremely sensitive to sway bar settings - 1/4 inch either way is quite noticeable. Konis are the weak link - soon to be replaced with custom built Proflex shocks.

Cheers,

Mark.


This is almost what I have, and I would venture to say that this would be perfect.
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