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Old 03-31-2012, 10:55 PM   #1
MIKE FROM SM
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Default How hard to hit a drag radial

I just switched to a Hoosier 275/60 on my 3250lb Camaro. It is a BB N2O car. i am running 17.5 psi on a 10" wheel. If you look at the video, the tires wrinkle quite a bit and then is spins a little bit out. Do you think it needed more power where it spun or less?

http://www.youtube.com/watch?v=bjSUt...bbAUAAAAAAAAAA
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Old 03-31-2012, 11:31 PM   #2
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Default Re: How hard to hit a drag radial

Mike, it looks like it unloads when th front end hits the ground, like the rear gets light...maybe less rebound damping on the rears or a little more compression on the front?
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Old 04-01-2012, 12:21 AM   #3
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Default Re: How hard to hit a drag radial

It actually starts to spin while the front is in the air. It just smokes a lot more when the front tires hit the ground.
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Old 04-01-2012, 01:04 AM   #4
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Default Re: How hard to hit a drag radial

i never ran radials but id say may just a little more front end travel?? not very much front tire drop? just a old 28 10.5 slick tire guess lol
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Old 04-01-2012, 01:57 AM   #5
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Default Re: How hard to hit a drag radial

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Originally Posted by MIKE FROM SM View Post
It actually starts to spin while the front is in the air. It just smokes a lot more when the front tires hit the ground.
Well that's telling you something...
You're right...in slow mo you can see it start spining as soon as the front starts to drop.
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Old 04-01-2012, 02:11 AM   #6
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Old 04-01-2012, 02:16 AM   #7
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Default Re: How hard to hit a drag radial

Are you using a progressive unit?

If so, I would give it more power a few tenths before it starts to spin.
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Old 04-01-2012, 10:38 AM   #8
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Default Re: How hard to hit a drag radial

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Originally Posted by CutlassRacer View Post
Are you using a progressive unit?

If so, I would give it more power a few tenths before it starts to spin.
yea to keep that front end up a little longer ang higher
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Old 04-01-2012, 10:51 AM   #9
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Default Re: How hard to hit a drag radial

Im curious why it only smokes the left tire?
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Old 04-01-2012, 12:35 PM   #10
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Default Re: How hard to hit a drag radial

It needs more air go up to 19 or 20 and tighten rear ext and comp a touch. And you should be good.

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Old 04-01-2012, 01:36 PM   #11
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Default Re: How hard to hit a drag radial

It may need a little bit more air pressure, but I do not think it needs 19! You can watch the wrinkles in the sidewall go away and then it starts to spin, while the front tires are still in the air. Adding a little bit of power in that area should keep the tire planted better. If it tries to wheelie, tighten up the front extension a click or two, then take some travel out if it still wants to wheelie.
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Old 04-01-2012, 01:50 PM   #12
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Default Re: How hard to hit a drag radial

Exactly the reason you see the wrinkles go away is because the tread of the tire is now wadded up and then shakes and spins. More air! I run 18 to 21 in our leaf spring car. It 60s pretty good.
It also extends rear shock to quickly imo.
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Old 04-01-2012, 02:52 PM   #13
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Default Re: How hard to hit a drag radial

Two questions:

1. What kind of rear shocks and spring? Where are the rear shocks set at on rebound and compression?

2. Are you using a progressive, if so...what's the ramp look like?
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Old 04-01-2012, 03:12 PM   #14
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Default Re: How hard to hit a drag radial

I thought I might need more air; I never see drag radials wrinkle like that. The car has split monos with cal tracs, strange doubles in the back full stiff on comp 5 clicks from full loose on ext. Front has afco doubles with about 7 clicks on ext and a bunch on comp. The progressive is flat for a few tenths and starts ramping up. I also have some launch retard that is in fairly quickly. The engine makes a ton of torque and the car is high geared.
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Old 04-01-2012, 06:22 PM   #15
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Default Re: How hard to hit a drag radial

Quote:
Originally Posted by MIKE FROM SM View Post
I thought I might need more air; I never see drag radials wrinkle like that. The car has split monos with cal tracs, strange doubles in the back full stiff on comp 5 clicks from full loose on ext. Front has afco doubles with about 7 clicks on ext and a bunch on comp. The progressive is flat for a few tenths and starts ramping up. I also have some launch retard that is in fairly quickly. The engine makes a ton of torque and the car is high geared.

You are going to have to tighten up the extension some, also check for binding in the rear....sure doesn't look to have much travel. Just to give you an idea, even with a small block in my car, I run QA1 doubles on the rear that have been revalved. 24 settings total on each side. I run my rebound (extension) at 14 off of loose on a decent track 18 off of loose on a good tight track, with about 4-5 clicks more on compression. This slows the extension of the rear shock, and keeps it from slamming the tire into the track, which will also give the sidewall a false low pressure look on launch. Not to say that you don't need more air...but it will amplify the wrinkling.

On to the fronts, I run the AFCO BNC doubles on the front of mine and had to send them back to AFCO and have them revalved. They now have their Pro-Mod valving. And remember, I'm just running a small block. Tight is your friend with a radial.....unless you want to run the limiters, which I don't like to do. I run all the travel in my front end, and control it with the shocks.

One other thing you can do on the progressive is to back up the ramp around three to four numbers on the initial ramp to bring the front end back down sooner and gentler. Say leave on 25% down to 22% for .3-.4 or wherever you converter tugs the motor back down, then you can start pouring the cold to it.


Hope this helps some.
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Stock suspension 67 Camaro
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In the chassis shop at the moment.


Thanks to:

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Nyes Automotive Racing Engines, Muncie, Indiana

FTI Converters and Transmissions, Deland, Florida

ACE Racing Transmissions, Garland ,Texas

Last edited by z289sec; 04-01-2012 at 06:25 PM.
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