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Forum: HoseHeads Sprint Car General Forum (go)
Moderators: dirtonly  /  dmantx  /  hosehead

Topic: Coils vs. torsion bars?
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revjimk
January 19, 2021 at 11:23:59 AM
Joined: 09/14/2010
Posts: 6140
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Why do midgets use coil overs & sprint cars use torsion bars?

Also, what kind of gear ratios do they run at Chili Bowl?

I had another tech question but can't remember it!  ;)



3togo
January 19, 2021 at 11:44:01 AM
Joined: 06/14/2016
Posts: 305
Reply
Reply to:
Posted By: revjimk on January 19 2021 at 11:23:59 AM

Why do midgets use coil overs & sprint cars use torsion bars?

Also, what kind of gear ratios do they run at Chili Bowl?

I had another tech question but can't remember it!  wink



Because they work better.



revjimk
January 19, 2021 at 11:53:25 AM
Joined: 09/14/2010
Posts: 6140
Reply
This message was edited on January 19, 2021 at 11:54:07 AM by revjimk
Reply to:
Posted By: 3togo on January 19 2021 at 11:44:01 AM

Because they work better.



https://www.youtube.com/watch?v=5YztNYiZrzo



linbob
January 19, 2021 at 05:48:29 PM
Joined: 03/12/2011
Posts: 1365
Reply
Reply to:
Posted By: revjimk on January 19 2021 at 11:23:59 AM

Why do midgets use coil overs & sprint cars use torsion bars?

Also, what kind of gear ratios do they run at Chili Bowl?

I had another tech question but can't remember it!  wink



I think most midgets at Chili Bowl had coils on front and T Bars on rear.  Coils rebound quicker than bars.  If you compress a coil it will decompress quicker than a T bar can unwind.  This transfers weight to rear for traction  quicker.  My guess is that on larger tracks they would tend to be mostly T bar cars.  I remember at Chili Bowel a well known driver switched fron all coils to coils on front and T bars at rear.  Most of WOO teams tried all coil cars about 1990.  Sammy was the most successful getting car to handle.  I do not know how to explain it but all coil sprintcars seem to go up and down instead of planting car.  I could be full of BS but think I am correct.



alum.427
January 20, 2021 at 06:46:40 PM
Joined: 03/16/2017
Posts: 1005
Reply

Correct. Sprint cars on a rutted track SUCKS. Because of the coil spring it would just bounce. The biggest issue was the LR,  a tie down shock was in a constant fight with the spring, with the wing and downforce it just wasn't worthwhile.  Coils work best on a tighter track, they transfer weight quicker as linbob stated. The stacked rack cars were around for awhile because the weight transferred left to right evenly. The sprint car chassis has basically been the same for Sooooo many years, same with steering hasn't changed since early indy cars. 



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