What sway do you guys use?

 

Cwalker.....something I just remembered.In the development of our '03 car we first had Hoosier 275 with Koni DA's and the car was good compared to stock....biggest remaining problem was inside wheel spin out of turns.
Last change was to a bigger front bar.....32mm solid at stiffest lever arm setting.This solved the wheel spin.Our bar was custom made but the 350EVO appears to be the same. The other choices out there are Cusco,Hotchkis and Stillen. Best I can tell all are about the same stiffness. The '04 Z has a stiffer bar too and based on the data I have seen it is close to all the others.WE plan to compare our solid bar to the OEM bar on our '05 Track when it arrives...they may be comparable.

 

Tomsn16...Thanks for the advice on tire pressures, I thought I was proably too high. The reason I started with Ohlins on the rear was that I had a lot less fabrication/machine work to do and I figured increased rear grip would help corner exit wheelspin. I'll hopefully have the fronts done in the next 2 weeks. You also answered something else I was wondering about. In the type of racing I'm used to, oval track, softer shocks usually have more grip. Based on what you said about your settings on the Konis maybe my 275 tires didn't feel responsive because my shocks were too soft. The 245 tires would help compensate for the soft shocks. Do the Koni shocks have a lot of force in the 1 to 3 in per sec. range?(If Koni wouldn't mind you telling me)

THANKS
Hippie

 

Hippie...I have the dyno charts but the units are metric.

Velocity(meters/sec)........0.033.....0.066.....0.099.....0.132
Force(newtons)
Frt.Rebound......................900........1600.....1800... ..2200
Frt. Bump..........................600........1200......1300....1 400
Rear Rebound...................400.........700.......1000....1250
Rear bump........................200........400.........750.....1 000

Hope this helps

 

Tomsn16...Thank you for the dyno numbers. I'll do a little....a lot of math and compare them to my dyno sheets.

thanks again
hippie

 

Interesting to hear something in regards to 04 Z33 spring stiffness, up til now the increase was just a rumor.

How many lbs of torsonal resistance did the 04 front sway bar measure when it was tested? EVO gave us the 03 front and rear bar amount.

 

We don't have any test results for sway bar stiffness, only calculations giving relative comparasion to '03 OEM bar based on dimensions(diameter,wall thickness if hollow and lever arm length).
If anyone has actual test data we would be very interested.

 

Tomsn16....I finally had a chance to compare shock dyno numbers. My rear compression numbers are really close, but rear rebound is about half of what you are running. The fronts I had planned on building aren't even close to where your at. I guess the goal for a street car is to build a really stiff shock that will keep the body flat so that you don't loose camber, and the stiffness should also help the responsiveness of the car. Thanks, you saved me a re-valve. If your co-drive at the Altanta tour event falls through let me know. I'm 95% sure I'll be there.

hippie

 

I got both the OEM front sway bar and the OEM rear springs sitting on a shelf in my garage. If I had the right tools to measure the sway diameter accurately, I could probably come up with some estimate of possible torsional rigidity (assuming the wall thickness is half of the thickness of the connecting portion at the ends of the bar). I also don't have good enough tools to measure the springs dimensions so that the spring rate can be estimated. I live in Sacramento, so if anyone has the right measuring devices, I could meet up, and bring the springs and sway bar with me.