Money2536

Nah...lowering is and has been a performance oriented modification since the beginning of suspensions. Factory height is designed to balance performance, comfort, and aid in people not ripping the front bumper off. Lower the car, align, and I guess corner balance and you are good to go. Although to actually corner balance the car you'd need to add sand bags to offset the driver.

Money2536

I lowered my GT3 and never bothered to have it aligned for the first set of tires. The car was fine. The RS sits much higher in the front from the factory, so I'll be heading to align. We'll throw it on the scales for fun and I guess corner balance it. Although, in my experience that never does much, especially on a car with a 35/65 weight distribution.

CAlexio

How does this work in a car with massive weight distribution issues like a 911?.. maybe on a 50/50 car like a mid-engine.. but on 911 how this work?

Money2536

I just took mine to get aligned and "corner balanced" today. I have always spent extra time measuring heights of both the actual coilover body then confirming by comparing the fender heights to get them close to where I want. I think it's pretty common knowledge that most set-ups end up with some rake rear to front due to rear engine position. It's about cross weights not front to rear weight distribution. Put the car on scales. You'd take the weight of the front left and rear right and vice versa to get a comparative distribution with you sitting in the driver's seat. The goal then would be to adjust the height or possibly sway bar stiffness to get the crossweights to equal 50%. Well...I've put about a dozen cars on scales over my 38 years on this earth, all of them ended up measuring within 2% of 50. The RS measured 49.75% without me in the car, then 51.2% with my 238lb rear end in the driver seat. I chalked it up to go to go. So as usual, we put the car on scales just for the fun of seeing how much the car weighed, 3354 with a full tank of gas. The whole corner balancing magic has largely been a waste of time and money for me.

GrantG

C.J. Ichiban

By angling the chassis (Rake) you control the "surge" effect of braking or the ability of the car to turn at various speeds.

General rules:

Lower nose= less air underneath the nose so it has more direct initial turn in.

Front vs rear ride height= the more rake the more the rear will rotate, for high speed stability you drop the rear 5mm or so. Very small adjustments here make huge differences

The rear steering masks a lot of the old problems inherent in track setup for a GT3/RS.


But the proper rake and nose height makes the car more reactive to the wheel. You also have to coordinate the sway bars to make sure that the rear grip is not overly compromised.

FourT6and2

Are the stock sways on the GT3 cars adjustable?

GrantG

Yes, three holes to choose from for each of the 4 drop links...

Larry Cable

taking mine directly from Stuttgart to Manthey Racing to get their magic applied!

Andi

Does anyone have the factory spec for ride height measurements on a 991.1 GT3? Thanks, Cheers, Andi

mdrums

Any rule of thumb, basic ride height and rake tips for a GT3 .2? I prefer a neutral car and one that keeps the rear end from hanging out. I'm better at dealing with understeer (push) at the track than over steer (loose) feeling car.

Thanks!

Wild Weasel

Did you consider something NOT with the engine hanging off the back?

mdrums

Nope not at all... Porsche -There Is No Substitute ;-) .....I mean neutral as far as a GT3 is concerned ..LOL....

mdrums

In your 1st video you forgot to jiggle the spring loaded part of the center lock nut out flush. This locks the nut in place. Be careful of not forgetting this important part when finished torquing the center lock nuts.

C.J. Ichiban

Drop front 1-2mm and the rear 3-4mm from stock and stiffen the front sway bar to one hole from full stiff as a start. That will keep rear planted and front from being too aggressive.

Personally I like the looser car set up because the rear steering negates a lot of rotation at higher speeds.

What I really dislike is a car that rolls and dives too much...the 675LT has spoiled me.