Tom Pultz

The V-8 sounds good. Nice roads and zero other cars around. Glad it's running so well

MichelleJD

Sigh. Now you're forcing me to do the same thing!!!

Looks AMAZING!!!!!!

Frank@Work

Ten years of work in fifteen minutes:

MichelleJD

I am awestruck.

JRP944

This is so awesome. Your work is top-notch and the end result is better than when new. Bravo!

Chapman951

Concours winner

SeaCay

So, what wasn't replaced with a factory new Porsche part?

Frank@Work

FYI:

I'm running the Bilstein cup coilovers without torsion bars. Yesterday I've replaced the springs on the rear axle. I've had several springs to test to get to the point where the ride is firm, but not too firm. The cars handles very well and has a lot of traction.

The springs I've ended up with (for the rear, without torsion bars):

Eibach ERS-H-200-60-0070
Lengt: 7.87 in
Diameter: 2.36 in I.D.
Rate: 400 lbs.in
Rate: 7.14 kg/mm
Block height: 2.81 in
Travel: 5.06 in
Block load: 2.022 lbs
Weight: 2.37 lbs

I will check which Eibach springs are on the front axle (and post it).

Voith

Nice. I got ERS 200 60 150 for the fronts. Maybe I'll go lower if it ever starts rolling on it's own power but for now I want it to be hard as a rock.

Tom Pultz

I guess "firm" means different things to different people since a rear coil over spring rate of only 400 lb./in is quite soft without torsion bars as the equivalent wheel rate is only something like 169 lb/in, which is less than a stock Turbo S. My S2 has stock 24mm bars PLUS 275 lb./in helpers on Koni 3012 shocks and that yields a wheel rate of about 255 lb/in. My front springs are 300 lb/in. To me this feels firm on the street and the car is well balanced (some might consider it "stiff" since I have spherical joints in the rear shocks and camber plates). Will be interesting to see what front spring rate you have.

Chris White

stiffness of the shocks makes a bigger difference in feel than the stiffness of the springs.
I have used 550 from 350 rear for many years as a 'benchmark' for street set ups with torsion bar delete. changing the compression of the shocks has much more of a 'stiff' feeling in the butt measuring device

Tom Pultz

That's a good point about shock settings Chris. I've seen references to setups that have used similar spring rates to what you state, but I've never seen anyone explain the logic behind what look like "mismatched rates" as I would be inclined to set it up exactly the opposite way for a car with near 50/50 weight distribution. To each his own

Chris White

sorry - other way around! 350 front 550 rear. Lots of folks get fixated on the 50/50 thing. I found that you tune either end individually, 550 is minimum for rear, any less and there is too much squat. 350 front is a minimum that gives nice turn in with decent ride quality. Track cars can go as high as 900 front. There is no real ‘tie’ between front and rear, they get tuned for what you want them to do

Voith

Any info out there what spring rates were on lemans race cars?

Tom Pultz

Ah, that makes sense. What's are your feelings about removing torsion bars on a street driven car? I was originally inclined to remove them when my MCS suspension gets installed, but I'm currently planning to keep the torsion bars since loads into the lower rear shock mount due to potholes, etc. can be much higher than what would be experienced on a smooth racetrack.