lowering
 

hi
info please
ive fitted 19" rims and 30 profile tyres front and rear
is it a good move to lower by 30mm
dealers etc say dont do it
all the money porsche as spent on this suspension set up
you will wreck the handling of the car
is this true
musso

Aside from the fact that you're running 30 profile tires all around ??, there's nothing wrong with lowering your vehicle provided that its done properly .

Really depends on what you're going to change to get 30mm less ride height. There are right and wrong ways to adjust ride height. Do it wrong and the handling could be adversely affected - do it right and the handling could be greatly improved.

Just remember that most mods like this are a tradeoff so be sure you understand what you might be giving up (tire clearance, ride quality, etc) to get the lower ride height.

hi
thanks for reply
yes running 30 tyres
i was going to go with lowering springs only
to fill the wheel arch
been to another rim and tyre dealer (and he deals in the top notch stuff)
his reply dont do it you will wreck it
but i want to do it ;)
in my mind will it go around corners like a jelly or brick :dance:
musso :)

What are you running for tire sizes ? The aspect ratio has to be off up front ?

235/30/19 front
265/30/19 rear

For what its worth, 235/35/19 tires would have more closely correlated with the oem specification .

Lowering Springs
 

I know we're all entitled to our opinions about what makes a great car, and I don't mean to be pejorative, but it sounds to me like you want to take what was once a $60,000 car and turn it into a ricer.

Look for my thread on tuning your suspension. If you don't match spring and damper rate, or stiffen the springs to reduce the ride height by 30 mm, you will indeed adversely affect handling. If you simply shorten the springs, you'll likely hit the bumpstops far more often, which isn't good handling, either. By lowering the chassis, you also affect the front and rear roll centers which affects weight transfer in corners...there are so many variables that unless you know what you're doing, you will make the car worse.

This is not to say that someone with the wherewithal (including a lot of money) can't experiment and arrive at a solution that results in a car than goes around corners better than stock. But it is not as simple as putting in stiffer and/or shorter springs.

I don't know how people manage these lowered ride heights, I was having some back-road fun around Pocono, PA, and my stock 987 was rubbing the front corners occasionally! Boxsters do look too high stock though, especially at the rear.
Steve

You were rubbing the underside of the bumper on the road? Just on regular twisties? That's really surprising.

Well, to be fair, it was only when the combination of a rise in the road + cornering load made the outer corner of the nose rub. It was like riding a roller-coaster, very fun :)

P.S. - just don't go "off", nothing but trees, rocks, and ditches.

Don't do it, you will wreck your cars handling!
 

Seriously though these cars are extremely sensitive to changes in balance and ride height. If you want it lower do it right with a set of adjustable coilovers and have it professionally set up by a shop that knows these cars well. A quickie, shade tree, DIY spring change often results in nasty handling and bump steer issues.

Driving these cars is supposed to be fun, not a PITA because it skips like a stone all over the place.

Ditto Ditto !