Rear End Rule Change for Chicago

[FlFlash]

The amount of Aero advantage rear steer gives on shorter tracks is minor compared to the mechanical steering effect it gives thru the center of the corner, it allows you to free the car up thru the center without haveing to do things that hurt your entry or exit.
Now on the Superspeedways with large amounts of rear steer your putting the whole right side panel of the car into the wind which seems like the wrong way to go because it increases drag so much and you want to Hide the spoiler behind the greenhouse as much as possible instead of sticking it out in the wind.
On our short track cars we use different lengths and angles side to side on the 4-link bars so when the car loads going in and thru the corner it pushes the right rear back and gives true rearsteer just in the corners, you can't Legally do that with truck arms in a Cup car.
There's a little more going on here than you think.

 

[ozz]

The amount of Aero advantage rear steer gives on shorter tracks is minor compared to the mechanical steering effect it gives thru the center of the corner, it allows you to free the car up thru the center without haveing to do things that hurt your entry or exit.
Now on the Superspeedways with large amounts of rear steer your putting the whole right side panel of the car into the wind which seems like the wrong way to go because it increases drag so much and you want to Hide the spoiler behind the greenhouse as much as possible instead of sticking it out in the wind.
On our short track cars we use different lengths and angles side to side on the 4-link bars so when the car loads going in and thru the corner it pushes the right rear back and gives true rearsteer just in the corners, you can't Legally do that with truck arms in a Cup car.
There's a little more going on here than you think.

Thanks for the info.Do the cup cars run watts linkage type rear ends on road courses ?

 

[FlFlash]

No the Cup cars run the antiquated "Truck Arms" everywhere. They have been running them since the 70's, simple and strong, in my opinion a very poor suspension for racing. Same technology as was under a 1965 Chevy Pick-up

 

[ozz]

No the Cup cars run the antiquated "Truck Arms" everywhere. They have been running them since the 70's, simple and strong, in my opinion a very poor suspension for racing. Same technology as was under a 1965 Chevy Pick-up

I watched Hammonds 101 show with the truck arms etc.Not much you can do with it legally, it's what makes it interesting I guess.

 

[FlFlash]

Well it took them 30 years to get away from dual point distributors, 40 years for bias-ply tires, 60 years for carburetors. Maybe in another 10 - 30 years they'll let them put a Real suspension under the back of the cars?

 

[Thegroundpounder99]

No the Cup cars run the antiquated "Truck Arms" everywhere. They have been running them since the 70's, simple and strong, in my opinion a very poor suspension for racing. Same technology as was under a 1965 Chevy Pick-up

Your Super Late Model doesn't have truck arms??? LOL.

 

[FlFlash]

We ran truck arms under a 65 Chevelle dirt latemodel in the mid 70's it actually worked pretty well back on the old sloppy clay tracks of the time. Once the tracks started going bluegroove it was a Slug and got sold off to the bomber class.
I'd run leaf springs and a spring shock before I'd put truck arms under a latemodel.

 

[ozz]

We ran truck arms under a 65 Chevelle dirt latemodel in the mid 70's it actually worked pretty well back on the old sloppy clay tracks of the time. Once the tracks started going bluegroove it was a Slug and got sold off to the bomber class.
I'd run leaf springs and a spring shock before I'd put truck arms under a latemodel.

We used to run one leaf spring for location and torsion bars .This gave us a fine adjustment method on dirt. ( clay).Worked very well.

 

[dpkimmel2001]

It'll be interesting to see how this all unfolds this weekend. Will we see a difference? Who the heck knows? I'm guessing that if we do, teams like Keselowski and crew will benefit from this by not having put time into working on this grey area.

 

[ozz]

It'll be interesting to see how this all unfolds this weekend. Will we see a difference? Who the heck knows? I'm guessing that if we do, teams like Keselowski and crew will benefit from this by not having put time into working on this grey area.

Brad certainly has the speed along with the luxury of consistency.Then again, so has Dale Jr.

 

[FenderBumper]

It'll be interesting to see how this all unfolds this weekend. Will we see a difference? Who the heck knows? I'm guessing that if we do, teams like Keselowski and crew will benefit from this by not having put time into working on this grey area.

NASCAR coming out and giving the official OK and setting limits could be huge for the Penske cars. Shortly after that announcement, Cindric hinted that their cars would now have the feature. Brad was right there at Indy and Michigan, 2 tracks that benefit greatly from that technique. This could be the little bit of speed they needed to pull off some wins.

 

[FlFlash]

Seeing how we got off on this Whole Technical Thing here's a very well written by a knowledgable writer article on perhaps The Best Damn Racecar ever Built.....Yep Smokey's "OUTLAW" 67 Chevelle, make sure you click on the pics LOTS of interesting stuff in there if your a gearhead like me.

http://www.circletrack.com/chassist...yunick_1967_chevy_chevelle/canepa_design.html

 

[getadietdew]

No the Cup cars run the antiquated "Truck Arms" everywhere. They have been running them since the 70's, simple and strong, in my opinion a very poor suspension for racing. Same technology as was under a 1965 Chevy Pick-up

lol,but true

 

[basscatcher89]

The amount of Aero advantage rear steer gives on shorter tracks is minor compared to the mechanical steering effect it gives thru the center of the corner, it allows you to free the car up thru the center without haveing to do things that hurt your entry or exit.
Now on the Superspeedways with large amounts of rear steer your putting the whole right side panel of the car into the wind which seems like the wrong way to go because it increases drag so much and you want to Hide the spoiler behind the greenhouse as much as possible instead of sticking it out in the wind.
On our short track cars we use different lengths and angles side to side on the 4-link bars so when the car loads going in and thru the corner it pushes the right rear back and gives true rearsteer just in the corners, you can't Legally do that with truck arms in a Cup car.
There's a little more going on here than you think.

Didnt say they were exactly the same but it all comes down to squishy rubber bushings. Im sure they are more technical on how they control it. different ways to skin a cat.

 

[ozz]

Seeing how we got off on this Whole Technical Thing ]



lol,
I don't think anyone was trying to be a Tech Head, just trying to get ones head around how basic Nascar wants these Cup car rear ends to be.
Thanks for the link on Smokeys Chevelle.That's what I expected to see under todays cars.