I was on the fence between the tbars before the new one came about. The thinner tbar would make the car dump over and do some odd things... but it soaked up bumps good. The thicker one basically did the opposite, car stayed flat like I needed it too, provided a little more steering, but SUCKED in the bumps at our track.


I've been drilling new tweak screw holes about 8-10mm back form the stock locations. This gives the tbar more side to side stiffness, while having minimal effect front to back. I'm pretty sure most of the guys at snowbirds are running something similar.

-Korey

How do you set the droop? i.e. what should I do if it is 2,0 mm now and want to make it 2,5 or it is 3,0 mm now and want to make it 2,5.
(this is a quote of #234)

By adjusting the center shock.

And how do you adjust the center shock?

you make the shock longer...
One possibility is to put a shim behind a ball cup of the center shock.

oze- you can simply unscrew the ball cups a little to lengthen the shock. there is probably 3-4 mm of adjustment while retaining enough thread engagement to keep the shock strong enough to function.

For those of you not following the race, the Snowbird Nationals in Kissimmee, Florida (largest carpet race in the world) concluded earlier today. There were 4 SP12x cars in the stock A main, including TQ (Jeff Brown of Corally USA), 2nd and 4th qualifiers and first and third finishes. Not sure how many in the 19T A main (at least 1, maybe more), and 3 in the modified A main.

Setups to follow!

Thanks, guys, it's done. Works.
Next week I am on a club race, the track is a bit bumpy, so will try Korey's bumpy setup.

Thanks, guys, it's done. Works.
Next week I am on a club race, the track is a bit bumpy, so will try Korey's bumpy setup.

Snowbirds update- There were 5 12x cars in the 27T main, 2 in 19T and 3 in modified. all with different drivers. So 10 out of 30 spots in the 1/12 scale mains were Corally SP12x cars, driven by 10 different racers.

Jeff Brown's setup (TQ 27T):

Tires: Jaco lilac front, 1.60 " and yellow rear, 1.71", full front and 1/2 rear tire sidewalls glued with CA
Front suspension: Corally WC (same as Assoc. dynamic strut) with 10 degree reactive caster blocks, 2 spacers rear and 1 front, 1 1/4 degree camber, raised steering arm ballstuds, threaded axles from Parma
Front springs: .020
Servo mounting: flat, rear mount (ballstuds for steering arms facing forward)
Front width: 165 mm at top of tires
Toe in/out: 0 degrees
T-bar: Corally 2mm, with center screw on rear pod removed and spacer cut to only have spacers under 2 pod mounting holes, no spacer under front pivot ball
Center shock: IRS VCS shock, front mount raised 1.5 mm and rear mount moved back 6 mm, 25 wt Assoc. shock oil, olive center spring
Ride height: 3.5 mm, chassis level when race ready
Rear pod droop: this is checked by lifting center shock rear mount and measuring height at rear of main chassis. Difference between static ride height and lifted height was 1 mm
Rear width: 171 mm
Chassis: stock kit chassis
Speed control: Novak GTX
Batteries: Team Kwik Ener-G 4600 NiMH (Note: the SAME pack of batteries was used twice in practice, in all 4 qualifiers, practice the morning of the main, and in the main)
Motor: handout CO 27T tuned by Team Kwik

The carpet was high bite, and very smooth. Bumps were not an issue.

Let me know if I forgot to mention anything!

Forgot to mention body was Protoform Speed 12

And somebody pointed out I forgot the side-to-side dampening. Jeff used Corally red lube in the dampeners.

Anyone have any idea if Corally is going to release a thinner 12x (corally spec) chassis for low traction surfaces?

ie low bite surfaces without the use of tyre additives

drivingpro- Nothing known about that here in the U.S. Most of our tracks use a spray traction compound on asphalt and allow tire traction compound, so the stock chassis works well as long as we are careful with tire selection.

GREAT JOB ON THE TQ JEFF..!

.... next stop on the tour... "2008 R.O.A.R. Carpet Nats!"...???

The US spec vs Euro spec are the equally thick.
But the Euro/Corally spec has a little more bit flex.
No thinner/more flex chassis planned for this time, for reasons mentioned before.
I would indeed try to solve this with (super soft) chassis setup/springs/shock/tires/body.

Good luck.