JPIII; here's some musings (and no more)
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I ran 35 psi cold raising to 39 psi hot
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* That sounds kind of high to me considering how light the 911 or 914's are. Have you ever tried running lower pressures? It's a free test. I'm guessing that you'd want to wind up with hot pressures in the 30-32 psi range. If you are unsure,
I'd read through the Hoosier technical recommendations which recommend a minimum cold pressure of about 24 PSI assuming that your car weighs about 2400 lbs.
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Last time I checked temps was at an AX
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* Could you post the actual readings? Hoosier seems to recommend ideal temperatures in the 180-200 degree range. The front/back balance is also meaningful.
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I am fresh out of negative camber at the front....nothing more to be had. ... I have also reached the point of diminishing returns from lowering.
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* Keep in mind that lowering a McPherson strut equiped car works to cross purposes with the suspension geometry. Once the lower arm of the suspension is level when at rest, any further compression (as would occur on the outside corner when cornering) will cause a camber loss, especially after you figure in the body lean. What are the rules of the particular class you are driving in? Some options to resolve the problem are...
- Raise the car a little bit and tune the shocks to manage the roll.
- Use RSR style front strut assemblies which lower the knuckle on the strut and thus return the geometry to a favorable zone.
- Try using a camber bar to pinch in the tops of the front strut mounts.
- Get some camber plates
- Increase the front caster which will do a couple of things, some desireable - some not. The good news is that it would increase the negative camber on the outside wheel when the steering wheels are turned, especially when they are turned a lot which often helps when autocrossing. It will also make the steering heavier which may or may not be an issue.