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YOUR RESEARCHLoose steering at speed
Leading reported evidence
Check bible and it says 17"- 36psi f&r
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Back on topic, I just checked the bible and it says 17"- 36psi F&R.
Leading evidence: 'Check bible and it says 17"- 36psi f&r' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check alignment and tire pressure' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion · Original poster
Anything in particular to check besides taking it in for an alignment?
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Anyone have a fix for this? My car (99 C2, w/ aftermarket Aero 1, orig fact 17" wheels, Goodyear F1 all season) steers beautifully at normal speeds. I have had a couple opportunities to get the car up over 90+ mph (also had a full tank of gas), and the steering is a bit twitchy and loose, not nearly as planted as I would prefer. I get little or no vibration, so I'm thinking the tires are properly balanced. I'm looking at larger wider wheels right now, and will fit them with sumer tires. Maybe that will help a little also.
Right now, I won't be driving down the Autobahn at 150 anytime soon, it would be terrifying.........
Mitch
If you have the rear wing you need the deeper front spoiler. Alignment is also suspect, the settings are fragile and can be knocked out easily. Car should be rock solid at speeds of 150 MPH.
I'm adding the GT3 Cup front splitter to mine. Looks very subtle in photos, and supposedly helps.
I'm assured that the lightness in the front end is not as bad as it feels, but I'll be glad to settle it down a bit.
My tire pressures are 34F 34r for 17" tires. My front bumper has an aftermarket GT3 piece, and it has the lower lip added into the general molding. I took a measurement and the front center clearance is 6 1/4", the back edge (right before the wheel) is 5". So it tapers from the front, downwards. Is this correct? Stock ride height. I'll get a pic of it, and show you guys what I mean that the "lip is integrated with the bumper". Looks a bit ****ty to me, maybe I should spring for another bumper, and will do so if this is causing problems.
Running that low of tire pressure will cause all sorts of handling problems. Your car probably wants to wobble too. Get you back tires up to above 40 psi.
Really? It drives and handles fantastic at normal speeds. Seems like higher pressures would make things worse at high speeds. I'll give it a try though. So 36F and 44R is where to start, correct?
Thanks. I have a dream job, I pass gas in my pajamas all day.
Back on topic, I just checked the bible and it says 17"- 36psi F&R.
The 17" wheels may be part of your problem. I felt a huge improvement in higher speed handling when I upgraded to 18" wheels.
The "aero" front spoiler is added on my car, the lower piece over the original bumper. You can see it where it's circled in Porsche-T's post. Are my clearance mesurements the same as other with Aero front bumpers? This piece may have not been installed 100% correctly, and could be causing trouble.
Also- as I said, the extra "front lower lip" is already integrated to this piece on my car, I cannot add one.
I'll have 18"s on it soon, but the 17" should not cause trouble. Maybe the all season Goodyear F1, but they seem pretty good for all season and are new.
Suspension seems fine, car handles well, doesn't pull. Anything in particular to check besides taking it in for an alignment?
I had the exact same experience. The dealer had put on new
all-season
Pilot Sports and I have to admit I didn't notice. The ride was like a rowboat on the high seas compared to the 18s. I mounted Dunlop snows on the 17s. Even they handle better than the all-seasons.
I'm voting for alignment. The lower lip (splitter) is actually a black rubber component and it looks like someone may have painted it to match the front bumper...which is fine. One of the issues with these cars at high speeds is that Porsche is mandated by US law to raise the front bumper to meet US regulations. I've always contended that it changes the dynamics of the engineering to make the car feel a little squirrely whenever it's not in PERFECT alignment. Most drivers who have switched to RoW suspensions have noted vast improvements in handlings...not to mention all the drivers who went with 3rd party adjustable suspensions.
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