I Have Recentley Started Running A Gen3 Which Has The Suspended T-plate. From My Understanding They Started Running These Cars With A Suspended T-plate So They Could Lower The Roll Center. Can Some One Please Explain To Me What Roll Center Is And How It Effects The Car.... Like If I Run The Short Pivot Balls It Will Make The Car Do This Or If I Run The Long Pivot Balls It Will Make The Car Do This.... I Have Been Running The Car With The Long Balls In It But Some One Told Me That The Longer The Balls The Tighter The Car Will Be.. Any Help With This Would Be Awsome Thanks

The lower the roll center, the more traction you will have because it moves the roll center down away from the center of gravity (more weight transfer).

At least that was the way it was explained to me.

Are you running bump stops? If so are they the analog or digital ones? :D

sorry I just could not resist...

the higher the roll center (original position) the quicker the car transfers in the corner and the less side-bite you will have. The lower roll centers will give your car more side-bite and will slow down the way the car transfers.

In closing, - the smaller the infield the higher the t-plate (ex. small tight bullrings and tight corners such as Turn-4. If the track has large sweeping corners as in the Snowbirds track, you will have to lower the t-plate (via the long ball studs).

Antonio

Are you running bump stops? If so are they the analog or digital ones? :D

sorry I just could not resist...


LMAO!!!!

Scott- LOL!

Now- here's a question for the floating t-plate guys (I'm not one...)- are you changing the front roll center as well when you change the rear?

Good Question. Another Question Is How Would You Change You Roll Center In The Front

Good Question. Another Question Is How Would You Change You Roll Center In The Front

Upper A-Arm angles.

yes that changes roll center, but it also changes camber gain. With a static lower arm there is no way to adjust one without adjusting the other. Our cars are more dependant on camber gain than front roll center since there is so little suspension movement in the front.

Well how much camber gain is to much or how many shimes under the upper a-arm are most guys using? I currently run -3* RF and .40 shims under a-arm is that not enough or to much?

My roll-center is also .100 to the left of center according to the program I have. That would mean less rolling resistance? Just curious because with that set-up I'm able to run some pretty soft springs in the front-end.

Jason

If it comes out to the left of center, you're running your front end almost backwards to where most people seem to run theirs. A (front) roll center to the left of center allows your right front suspension to work more freely than the left. Most front ends are set up (using the upper hole on the left and bottom hole on the right) so that the front roll center ends up at about chassis height and near the edge of the right lower A-arm (around 1.5" to the right of center) in order to make the front end not so aggressive.

ok I guess I had that backwards, but what if you're running the stock Assoc. castor blocks, you don't have the ability to change upper arm angle.

The only way to do it with AE ones is to use long kingpins and put more or less shims under the upper A-arm pivots. Either way, with the AE ones it will still keep your front roll center closer to the chassis centerline which would make it more aggressive than if you take advantage of multiple hole blocks.

ok I guess I had that backwards, but what if you're running the stock Assoc. castor blocks, you don't have the ability to change upper arm angle.

And one less thing to dial yourself OUT with! :drunk:

How would raising or lowering the rear roll center make the car react differently than changing side springs to affect how much the car rolls?

That would be like asking the same questions about the front springs. All the suspension geometry and spring rates tie together to make it work.

One reason lowering the rear roll center may not work very well is that we can't lower the front roll center along with it to keep a "balanced" car. In the "standard" position rear roll center is at roughly the same height as the front roll center. Due to the use of the Associated front end, there really isn't a good way to lower the front roll center to at or below chassis height like can be done in the rear of hanging t-plate cars. (The only way to do this would be to use IRS arms with no shims underneath, then do some funky shimming of the kingpin to set ride height...which probably wouldn't even work very well)