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YOUR RESEARCHAnyone track there 996?
Reported or suspected cause
wider rear tires relative
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Reported cause
The understeer is caused by the wider rear tires relative to the front.
Leading evidence: 'wider rear tires relative' (1 discussions report identifying this cause; no attributable repair resolution). Across 1 matching discussions, the most frequently mentioned possible cause is 'wider rear tires relative' (1 discussions; 1 report identifying it and 0 suggest it). The most frequently discussed action is 'Adjust 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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Performed · outcome unconfirmed · Original poster
I've adjusted my tire pressure and that helped a little but nothing like I'm looking for.
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Performed · outcome unconfirmed
I'm running 225s upfront and 265s in the rear, 18" wheels.
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If your car does not have it, getting it is probably the best way to improve your car's performance.
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Suggestion
Then you can move on to a more agressive suspension, I'd recommend the X74 and then if you are serious, think about 245's for the front on a seperate set of race wheels with R compund rubber.
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Suggestion
Then you can move on to a more agressive suspension, I'd recommend the X74 and then if you are serious, think about 245's for the front on a seperate set of race wheels with R compund rubber.
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My car understeers pretty bad. Is it because of the huge rear tires I have relative to the front? I have 285/30-18's in the rear and 225/40-18's in the front. I've adjusted my tire pressure and that helped a little but nothing like I'm looking for.
I'm used to a car that is a little looser in the rear than this. Other than getting new suspension, does anyone make an aftermarket rear sway bar?
well that has some to do with it, as well as the very narrow track of only 92.?", but the biggest thing is the weight distribution on these are off because of where the engine is, some wheel spacers would help
Are the front rims 18 by 7.5? If so switch to 18 by 8-that should offset the some of the understeer with the larger rear wheel. Maybe a switch to a ROW set up suspension. Regards. Mike
The standard wheel width for the 18" wheel on the 99 models were only 7.5". The understeer is caused by the wider rear tires relative to the front. There a couple of things you can do...
-replace the front rims with an 8" wide front rim and keep the same tire sizes
-replace the rear tires with the standard 265/35
The stock suspension is setup for understeer, the sport suspension (ROW & US) helps that some. But another advantage to upgrading the suspension is that you can tune the alignment better for some negative camber. Till then you could trail brake into slower corners to help keep the front end planted. You could also play with tire pressure, and sway bars, but I do not know specificaly what to tell you in that department.
My $.02
Sloth how do you like your GT3? My friend has an allocation for one but he may not take it so I'm kinda thinking about it(heart says yes wifey says no..working on that). Must be an awesome ride!!!! Regards. Mike
ROW stands for "Rest Of World" which is a sportier setup that lowers car by 20mm front 10mm back and firms up the ride. US sport suspension is the same except height is the same as stock suspension. Regards. Mike
The stock setup is set for understeer. I have a C4S, with rear tires wider than yours and AWD, both of which theoretically produce even more understeer. I don't find that too much of a problem when I track the car, though. One thing that helps is that my car has the sport suspension. If your car does not have it, getting it is probably the best way to improve your car's performance. You can go one big step further by getting the adjustable suspensions such as the GT3, X74, or aftermarket such as the PSS9. You can also just get the adjustable GT3 sway bars.
Having said all that, the stock 996 suspension is still awesome on the track. You just have to learn to make use of it. Some advanced techniques like throttle steer and trail brake go a long way in helping rotate that butt-heavy car for a tighter turn-in. Talk about this with a DE instructor next time you go to the track.
To tell the truth, I am still waiting for delivery. I know it made the port and they are just waiting for the paperwork. Any day now, I just hope I can take delivery before I go to Leipzig on Sunday. If not, it will be the first week of September for sure.
RoW M030 will help a lot, you may also want to consider adjustable GT3 sway bars. I love my M030, it's the perfect street/ occasional track setup for me.
NickS, I'd go with re-aligning the car to just barely toe in, then have the camber set to negative 0.5 degrees upfront then 1.5 degrees negative in the rear. It helped.... still understeers though but it's better. I'm saving up for the PSS9s and the adjustable GT3 sway bars.
Well Sloth-great color choice-I woulda picked that color too and hope you'll get it soon before your trip ands let us know. Very envious!!!Regards. Mike
NickS,
"Thanks for the tip! How did this setting affect your tire wear? What size tires do you have in the rear?"
I'm running 225s upfront and 265s in the rear, 18" wheels. As for the wear, its not too bad. Actually my tire wear is better then it was before - I know its wierd but so far that's what I've noticed. The tires now wear more evenly where as before the outer ribs would wear down quicker (upfront and in the rear).
As for the toe adjustment, my car is setup with just a touch of toe in. At highways speeds, the car would sometimes "wonder", especially if there are grooves in the road. You may want to think about this adjustment but I enjoy it. My 996 now handles a little closer to my '78 911SC.... which means paying attention behind the wheel.
The understeer is engineered into the vehicle because it helps save lives of under-trained drivers who think they are Mario Andretti.
Without getting into it, PCNA lost a lawsuit many years ago in which a person in La Jolla, CA lost her life because an inexperienced driver was not used to the OVERsteer. As a result of the lawsuit, all Porsche cars (and in fact most cars worldwide) are designed to understeer.
This can be corrected by a simple trip to your neighborhood Porsche Tuner and a nice suspension upgrade. Personally, I have the Techart Coilovers, but I understand the Bilstein PSS9 is pretty bad-***.
Alot of information, most of it good. Bottom line place to start is an agressive alignment. The stock spec on the car is far from what you need on the track. Max out the negative camber and you will find it much more neutral and enjoyable. Then you can move on to a more agressive suspension, I'd recommend the X74 and then if you are serious, think about 245's for the front on a seperate set of race wheels with R compund rubber.
I plan in doing an alignment this weekend or next and see how that works. If that doesn't do it, then I will try just a bigger rear sway. Suspension is last on my list simply because the roads here suck AND it will lower my car more than I am comfortable with.
My first thought was to do as you suggested and go with a 245 for the front. The problem is, I can't find a matching rear. I'm sticking with the 285/30-18 so I would need to find a tire brand that has the rear AND a 245/35-18 for the front. Nothing exists that I have found. The 245 would only be 1.3% smaller so it's negligible.
So with all that said, I'm more than likely going with 225's for the front and 285's for the rear in the S-02's, getting an alignment and seeing how that works.
Track wheels and tires will come eventually but for now, the S-02's will work just fine.
