333pg333

Pete,
Not sure you could just take a ratio and keep expanding from there. The differences between the front and the rear just keep getting further apart. Doesn't sound right to me.

Ski

Skip, yes Cervelli liked stiff springs. We set it up with the help of a Koni guy and Jason at Paragon, based on the valving that the we had the front shocks rebuilt to. We sent them to True Choice and had some stiffer valving installed, couple that with the 3012's in the rear. It's just been a 100# difference, car feels like it's on a rail, just rolling a bit harder as we get a bit faster in longer turns. I think Lemm's car had 1200 all around, with JRZ triple adjustable before I played Lart with it.

pete95zhn

944 turbo cup cars had progressive springs rated @ wheel F 200-355 lb-in & R 320-545 lb-in.

H&R uses in their Clubsport-kit ( RSS-37-827-1/1 ) wheel rates of F 370 lb-in & R 555 lb-in. http://www.h-r.com/katalog_download_de/Porsche.pdf

Wheel rates counted from spring rates with multiplyers of F 0.9 & R 0.56.

Skip Wolfe

Sorry - here is the link + I fixed the original:
https://rennlist.com/forums/racing-and-drivers-education-forum/345391-so-is-inside-front-wheel-lift-inherent-to-the-944-968-chassis.html

Blackwater

Ski, has the stiffer springs altered your thinking and approach to tire pressure adjustments? What do you normally run as a baseline on each corner?

Ski

Toyo RA1, start at 28-30 in the front and 26-28 in the rear, by the time the session is over, they're about 32-34-36 and 30-32-34 by the time we get to pit lane, of course track and track temp play a little part in there as well. Temp probe has us right on the heat buildup with those pressure - inside hottest, middle hot, and outside still less. The Toyo's can be best right before you're ready to throw them away, for a few sessions anyway. Can't justify MPSC price for just DE but what I like about the Toyo's is you can turn them inside to out for Dry runs, they're only directional if in the wet.

Blackwater

Just based on what you saying, it sounds like you're fairly neutral but sliding around a bit. The agressive springs are allowing the tires to "wad up" on the inside during load, thus the increased temps. You must like a "free" car and would probably be a pretty good dirt tracker!

xsboost90

400 up front, koni adj struts, paragon coilover
375 rear w/ QA1 adj. coilovers and i reindexed my torsions to basically neutral
w/ the MO30 968 sways, rear adjusted to full soft, i still have a touch of over steer w/ the new Toyos (245/45/16 all around ) but ive only been able to try them out once and it was snowing. Hopefully in the dry its alittle better.

Ski

It actually sticks very well after the first couple of laps in the morning but after that, temp and track warm up, it sticks like glue, unless your foot is heavy is second gear in a slow turn, then the rear tires light up if not careful when getting back on throttle. The temps of the tire are directly related to pressure and the camber settings we have - which are fairly aggressive as well. Yes, I prefer a bit of oversteer, so does Jim L - partner in the car - to understeer if I'm going to get any adverse handling. IIRC, Toyo recommends a fairly low pressure starting out, they have a nice sidewall, rear sway bar is set in the middle - nuetral. I wish my street car handled as well but I don't think my wife and I could take the jarring on a weekend cruise

Headed on vacation for two weeks, everyone be safe on the 4th!

333pg333

From what I understand it's not just the tread pattern that designates the directionality of a tyre. The belts underneath are also directional and they are not recommended to run the wrong way around. Of course this could be from Toyo itself so that you buy some new ones sooner but that's just what I heard.

Skip Wolfe

Toyo states that you can run them in either direction in dry conditions.

xsboost90

the deal with steel belts is that once you run them in one direction for awhile, they stretch that direction- then if you reverse them they buckle and bubble etc under the tread and can blow out. This is true w/ older steel belted tires but newer ones may not have that problem.

M758

I have run toyo's backward and forward for 5 years with never a problem. All of the 944 spec guys do the same and we have never had and problems and Toyo has never said this was not possible to do.

shiners780

Since we're on a Toyo RA1 tangent, has anyone purchased a set recently with a manufacture date at or past March '07? I used a new set this week and they seemed a lot different than past sets I've used. Granted, these are a little wider than the ones I've used in the past, but the tread block squirm was not bad AT ALL with the new tires, but was treacherous with the older tires especially under braking. I'm talkin' full tread un-shaved new out of the box.

xsboost90

- could only be a problem on directional tires also...

i bought my toyos right after you and they seem real good on the track for being unshaved. Everyone told me they would be real squirmy.