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dave murray
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Posts posted by dave murray
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Thanks again, really appreciate your advice, exactly what I hoped for!
Dave
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Mike, thanks, kind of what I was expecting on pressures, similar to what I have determined with hot pressures on 996tt. I assume you are using michelin sport cups?
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Mike, Craig, thanks again, sorry if my communication was not the best, a racer gave me the suggestion of full stiff or hard on front, 2 from full soft rear. After tinkering a little over the weekend, I can't imagine needing full stiff/hard on front, currently in 1st hole from full stiff. Rear is in 2nd hole from full soft. After aligned, and 1st track day, (end of march) I will have an idea how close I am to right.
I also have 996tt, with X-73 suspension, this car is fantastic, but I have to admit it is heavy, but the X-73 transformed the car from severe understeer to a real hoot to drive. Bought the GT-3 because of desire to go back in time to my old cars but have all the 996 features I have come to enjoy in new generation cars. For sure the 996tt has made me lazy in my driving and I need to step it up a bit with the new car.
Tire pressures? on michelin sport cups, on turbo I started at 29 front 31 rear, hot went to 35-36 hot, assume GT-3 I will start lower due to weight difference in the cars. Once again thanks!
Dave
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Mike and Craig, Thanks for your reply to my questions. I am set to get the car aligned in new couple weeks. I was given tip to set front bar full stiff, rear 2-3 from soft as a starting place, do you agree? Thanks Dave
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Congrats on the car. I run my car setup like this:
Front: ride height 115mm, camber -2.5°, toe 0.05° in per side, sway bar 1 softer than full stiff, pressure 33psi hot
Rear: ride height 128mm, camber -2.4°, toe 0.30° in per side, sway bar 2 softer than full stiff, pressure 36psi hot
To get -2.5° front camber, you will need to shim the front arms with about 8 to 10mm of factory shims per side. Alternatively, you can rotate the strut tops to the alternate set of mounting holes, but you won't be able to get much less than about -2.7°.
New cars are often shipped with front ride height 10mm too high, so you may need to lower the front. Rear height is usually pretty close to 128mm.
The softer rear bar helps getting on the power early. However you will suffer from more understeer in slower corners. A bit of trailbraking helps get some rotation. For autocross, a softer front or harder rear helps.
Dave.... after two years of fiddling, I support Mike's recommendations completely. You say you will use the GT3 80% on the track. While that alignment will work on the street, it won't be the best for steering stability and tire wear. I can get 3+ alignments done for the price of one rear tire....so, I realign for track and back for the street. I run my car on major road trips too and difference is worth the time and trouble of realigning. BTW, I had a local machinist make some aluminum shims for the front lower arms in 3/8" stock. He patterned them after the factory shims....and, they work just fine.
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I just bought at 2005 GT-3, and would like some advise for alignment and sway bar settings. I will use the car 80% track and 20% street, michelin sport cups, std sizes. Car is nervous in high speed sweepers and is headed for alignment as soon as I have feedback. As an instructor for Ozark Lakes Region, I have lots of seat time in 993-996 and 996tt and am looking to avoid brain damage of set up. Thanks Dave
GT-3 Alignment and sway bar settings
in 996 GT3
Posted