just wondering if anyone has tried standard or sport geometry settings back to back with RS settings and can report on the subjective differences on how the cars drove... particularly in terms of straight line stabillity, weave and 'crawling' on bumpy undulating roads etc..


cheers

R

 

Done right even far more agressive tha RS suspension settings can be used w/o adverse effects on the items mentioned.

The 3 biggest suspension objections
1) ride height -some just needt be higher than others due to driveways, road humps or whatever. My own car is on 3 wheels entering my driveway take it angled and slow it will usually be ok sometimes you have to pick your path carefully too.

2) springs - higher rate springs will make the car ride stiffer and more abrupt as long as shock setting s are relaxed this can be fine depending on your tolerances and expectations

3) shocks - running really stiff shock settings on the street is going to cause the worst deterioration in ride quality, back them off and you can still run huge springs comfortably on the street.

 

Bill thanks, my ride quality is fine

its just that the front end squirms, crawls and weaves on really undulating roads (not roads with sharp bumps but roads with slightly lower frequency bumps). Fast on some country lanes its quite disturbing and on some Motorways round here it becomes a real pain in the backside. Ive played with my bump and rebound but fundamentally this does not affect it. I've also dropped the tyre pressures a bit but if anything that made it worse. next is to try some smaller rims (17 as opposed to 18 hollowspokes) but i'm convinced its a geometry thing.

 

Never run into that are you sure all the bushes and other connections are still nominal?

 

If you have aftermarket suspension and different ride height, please explain because that's probably the cause. If you're at or lower than RS height, there's no amount of fiddling with alignment settings that'll fix your bump steer.

RS settings aren't much different than standard; a bit more camber up front (but still not a ton) and a bit more toe-in at the rear.

 

bushes and all suspension is A1 and been checked over by several people

Eric, car is on KW and 18" turbo rims. Geo is pretty much RS. Ride height is not as low as RS but getting there. On the upside she is pretty impressive in bends and feels massively planted with no understeer at any pahse of a corner even on an aggressive throttle.

 

I must say the best thing I've done yet for Andi is the GT2 Uprights. What a transformation!
The car no longer crashes over bumps, and is much more predictable since I have ALL of my shock travel .

 

I agree that at RS height or lower you will want the 993RS(GT2 later used these too) uprights to alleviate bumpsteer issues

 

hard to judge on a standard car, most Rs owners run lower than standard RS ride heights on the road without any significant bump steer.

Jackal, obvioulsy I haven't driven the car, but the 993 compared to the 968Cs will drive differently at the front end, you tend to keep a light hand on the wheel letting the car move around a little in comparison.

 

That would be because they have the RS uprights & tierods

 

Agreed Bill, but as we both know the standard car doesn't offer so much flexibility without compromise.

 

yep for sure clubsport....
very light grip on the 993, i totally get that (i hold the wheel with just thumb and forefingertips in all cars pretty much in any case)

and i appreciate that 911's always offer a slightly wild ride (and that's why people like them) and they aren't supposed to feel totally stable and glide everywhere like other sportscars.

but on some roads though it moves around just a little too much !

to be honest, my car isn't even at RS height so maybe not so much of a bumpsteer thing

I will try some 17" rims... that is bound to help loads. The feeling of the wheel when you first turn it is a bit odd, it has this sort of synthetic sticky resistance to it.. like the tyre is too hard and square and made out of glue ! Its not ideal but it did improve a bit when i dropped the front pressures. Some extra profile could be just the ticket.... never been a fan of huge rims and slim rubber.

 

seem to have solved this now with higher pressures

37/44 and there is far less weaving and wandering

 

What wheels and tyres are you running?

I run pressures way below that on the CS, even when using road tyres, let alone R rated tyres.#

Still, good that you have resolved the problem.

 

I went from a generic geo to one that is fairly aggressive and noticed a pretty dramatic increase of wandering/drifting at freeway speeds. The first couple of times that it occurred really got my attention, one time in particular it was downright scary and I slowed down. Now, I'm just used to it I guess, I do notice that freeway driving takes a bit more concentration but the diffence in cornering more than makes up for it.

I would think tires (compound/tread style/condition) and pressures (as you've discovered) would make the biggest difference in trying to sort such a problem.