Stiff sidewall,when is it benificial? - Chevy Nova Forum
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Old 12th-April-2017, 06:47 PM   #1
stjanifinn
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Stiff sidewall,when is it benificial?

Hi guys.

I run a smallblock 383cid ChevyII 64 at 2970# with driver on only 26x8-15 conventional Hoosier slicks. Suspension is stock mono leaf with sliders,anti roll, and caltracs

Car pulls 10.45 at 133 with 1.53 60's on transbrake leaving on 3800
1.82 first gear Glide and a 4:10 rear.

Experimented with pressure all over the place but seems to like 14psi best, along with the Calvert shocks in softest setting.
impossible to plant the tire with the power available N/A.

Should I try stiff sidewall?
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Old 14th-April-2017, 08:15 AM   #2
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I like the stiff sidewall on heavy cars. Mine is 3180 and I use them.
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Old 14th-April-2017, 10:39 AM   #3
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Old 14th-April-2017, 10:53 AM   #4
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From Hot Rod:

"Stiff sidewall tires are made for cars where a quick reaction time is necessary, such as in the Pro Tree “Super” classes: Super Gas, Super Comp, Super Street, Quick Rod, Super Rod, and Hot Rod. The tire works for them because it doesn’t wad up as much. They also work better on heavy, high-horsepower cars.
The downside for O’Hern was the tires didn’t hook as consistently with his 12-second car as well as his old wrinkle walls. However, another racing friend, Laura Brunson, tried a pair of soft sidewall 14 x 32s on her 10-second, 3,200-pound Trans Am. It didn’t take long before they realized that what worked fine on a 2,800-pound machine was not so good on theirs. The car wagged its tail on the top end of the track, and when they put enough air in (13 pounds) to make it stable, the outer edges never touched the ground. They are much happier now with a set of stiff sidewall Mickeys."

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Old 14th-April-2017, 04:22 PM   #5
stjanifinn
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Thanks for reply,so I guess my problems are suspension related
here is a video of launch https://youtu.be/kI8JNTzvkdU
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Old 14th-April-2017, 05:56 PM   #6
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I am not in any way an expert at this but it looks like you're hitting the tire too hard and it's bouncing back after the initial hit, unloading the suspension, and then spinning the tire. Maybe try slowing the rebound a little at a time.
Adding a pound of air might help as well. Just an observation and suggestion.
I hope that you get it figured out.
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Old 15th-April-2017, 06:16 AM   #7
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Originally Posted by hackshacknova View Post
I am not in any way an expert at this but it looks like you're hitting the tire too hard and it's bouncing back after the initial hit, unloading the suspension, and then spinning the tire. Maybe try slowing the rebound a little at a time.
Adding a pound of air might help as well. Just an observation and suggestion.
I hope that you get it figured out.
Thanks for your suggestions I will do small changes in shock settings and experiment with tire pressure. I am currently runnning 14 psi and shock is in setting 1 wich is softest. So I have plenty of room to work on.
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Old 15th-April-2017, 07:03 AM   #8
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What shocks do you have?
Front/rear suspension setup?

I run 10.6 NA with a 1.47 60' and dead hook on MT 26x8 radials which have a stiffer sidewall and I run 19# air.

I run dual adjust front and rear. Compression is stiff in the rear to avoid unloading. I also slow the front down a bit to help stop unloading the rear as well by tightening rebound a little.

And I'm no expert either, I couldn't figure out how to spray a 150 shot out of the hole and not shake or blow the tires off.... I'll be back at the track shortly to try and figure that out.


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Old 15th-April-2017, 08:04 AM   #9
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Quote:
Originally Posted by epfatboy View Post
What shocks do you have?
Front/rear suspension setup?

I run 10.6 NA with a 1.47 60' and dead hook on MT 26x8 radials which have a stiffer sidewall and I run 19# air.

I run dual adjust front and rear. Compression is stiff in the rear to avoid unloading. I also slow the front down a bit to help stop unloading the rear as well by tightening rebound a little.

And I'm no expert either, I couldn't figure out how to spray a 150 shot out of the hole and not shake or blow the tires off.... I'll be back at the track shortly to try and figure that out.


Sent while texting and drag racing
I have shocks from Calvert, 90/10 front with stock spring and 9 way adjustable in back. Stock mono leaf with aluminium bushings and slider in back. Anti roll with 1/2 turn preload on passenger side. My Nitrous system is just in a box in my garage I have to figure this better out before using nitrous..
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Old 15th-April-2017, 11:22 AM   #10
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My car works best with a full turn of preload on the Caltrac's, and dead soft on the shocks. I used to run pretty consistent 1.35-1.37 leaving at 6000 off the transbrake. Since tightening the converter to 5000, it rarely goes in the 1.3's; mostly low 1.4's.
Where is your pinion angle? Some folks will tell you it doesn't matter, but my car hooks great with at least 4° down, and blows the tires off at 1-1 1/2°.
It may actually work better on the bottle--sometimes hitting the tire harder helps. My junk went 1.3's on nitrous with slapper bars and 9" E.T. Streets.
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Old 15th-April-2017, 05:10 PM   #11
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Bow tie,

Pre load softens the hit a bit right? And when you say pinion angle do you mean the angle of the pinion or ??. Feels like more down angle on the pinion might hit the tire harder too right?


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Old 17th-April-2017, 06:46 PM   #12
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Quote:
Feels like more down angle on the pinion might hit the tire harder too right?
It works for me. Some chassis "experts" will tell you it makes no difference in how the car hooks. I only know what works for me...and some guys with cars dragging the bumper on 9" tires.
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Last edited by bowtie0069; 17th-April-2017 at 06:58 PM.
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Old 18th-April-2017, 08:44 PM   #13
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Quote:
Originally Posted by stjanifinn View Post
Hi guys.

I run a smallblock 383cid ChevyII 64 at 2970# with driver on only 26x8-15 conventional Hoosier slicks. Suspension is stock mono leaf with sliders,anti roll, and caltracs

Car pulls 10.45 at 133 with 1.53 60's on transbrake leaving on 3800
1.82 first gear Glide and a 4:10 rear.

Experimented with pressure all over the place but seems to like 14psi best, along with the Calvert shocks in softest setting.
impossible to plant the tire with the power available N/A.

Should I try stiff sidewall?
Consider Pro bracket radial
I.e.:radial slick
https://m.summitracing.com/parts/mtt...FYQCaQodfvAEpA
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