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tire pressure #1546596
12/12/13 01:21 AM 12/12/13 01:21 AM
Joined: Oct 2003
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Az
Crizila Offline OP
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Crizila  Offline OP
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Was running 14 lbs with tubes in my 29X13.5/15 Hoosiers QT's. Gonna start the season with the same tires, but tubeless. Thinking of starting around 20 lbs?

Fastest 300
Re: tire pressure [Re: Crizila] #1546597
12/12/13 01:27 AM 12/12/13 01:27 AM
Joined: Aug 2003
Posts: 43,157
Bend,OR USA
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Cab_Burge Offline
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You could start at 20 lbs and then, if it spins, let it down a 1/2 lb at a time until it stops spinning BTW, are those tires radials or bias ply tires? Me no speak Hoosiers

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: tire pressure [Re: Crizila] #1546598
12/12/13 01:33 AM 12/12/13 01:33 AM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Romeo MI
Weight on the back of the car makes a BIG difference
what you need for pressure
Re: tire pressure [Re: Cab_Burge] #1546599
12/12/13 01:34 AM 12/12/13 01:34 AM
Joined: Feb 2004
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S.E. South Dakota !
bigdad Offline
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You know your car better than anyone but ..

20 lbs sounds like an awful lot to me ??

What does MFG recommend ?

They hit it pretty close most often
Re: tire pressure [Re: bigdad] #1546600
12/12/13 12:46 PM 12/12/13 12:46 PM
Joined: Oct 2003
Posts: 7,506
Az
Crizila Offline OP
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Quote:

You know your car better than anyone but ..

20 lbs sounds like an awful lot to me ??

What does MFG recommend ?

They hit it pretty close most often

No recommendations on their sight for tire pressure. They are bias ply tires. They wrinkled quite a bit with 14 lbs in them. At 11 lbs they looked like they were starting to wad. I considered going up in pressure due to less side wall support with no tubes? Car is heavy ( 3600 lbs )and I am sure more than 50% on the nose.

Fastest 300
Re: tire pressure [Re: Crizila] #1546601
12/12/13 01:13 PM 12/12/13 01:13 PM
Joined: Nov 2003
Posts: 2,131
New Lenox IL
cudadon Offline
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New Lenox IL
John I would call Hoosier & see what they reccomend.
I use M/Ts and they said what Cab said.
Hoosier may be able to give a good starting point.
Don

http://i131.photobucket.com/albums/p314/cudadon/BKD6_09_10_191A.jpg
Re: tire pressure [Re: Crizila] #1546602
12/12/13 01:37 PM 12/12/13 01:37 PM
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY Offline
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Quote:

Quote:

You know your car better than anyone but ..

20 lbs sounds like an awful lot to me ??

What does MFG recommend ?

They hit it pretty close most often

No recommendations on their sight for tire pressure. They are bias ply tires. They wrinkled quite a bit with 14 lbs in them. At 11 lbs they looked like they were starting to wad. I considered going up in pressure due to less side wall support with no tubes? Car is heavy ( 3600 lbs )and I am sure more than 50% on the nose.



I would start raising it until the 60' starts to drop
then back off a bit... you should see a better ET
and MPH
Re: tire pressure [Re: MR_P_BODY] #1546603
12/12/13 02:16 PM 12/12/13 02:16 PM
Joined: Jan 2007
Posts: 8,032
Mt Morris Michigan
mopar dave Offline
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14-24 seems to be the range. I went from 14 to 18 and pickup a bit. I was told to try 24 with caltracs and dump air til it does'nt spin. mph is better with more air. I run my qtp without tubes.

http://www.youtube.com/watch?v=aIxaesJ190U

http://youtu.be/lCZAaN7fFLg
Re: tire pressure [Re: Crizila] #1546604
12/12/13 04:57 PM 12/12/13 04:57 PM
Joined: Jul 2004
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State of confusion
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Thumperdart Offline
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Quote:

Was running 14 lbs with tubes in my 29X13.5/15 Hoosiers QT's. Gonna start the season with the same tires, but tubeless. Thinking of starting around 20 lbs?



Are those qtp`s? If so, I raced for years in the 10 1/2-12 lbs. range and for me 12 was best but never tried more............

72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: tire pressure [Re: Thumperdart] #1546605
12/12/13 05:03 PM 12/12/13 05:03 PM
Joined: Jan 2007
Posts: 8,032
Mt Morris Michigan
mopar dave Offline
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yes quick time pro 28x11.50. hoosier suggested starting at 14, so I ran it there first couple times out. last time out put 16 in and then 18 and mph went from 128 to 129 and 130. 131 with hoosier drag radial at 18.

http://www.youtube.com/watch?v=aIxaesJ190U

http://youtu.be/lCZAaN7fFLg
Re: tire pressure [Re: mopar dave] #1546606
12/12/13 06:17 PM 12/12/13 06:17 PM
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Az
Crizila Offline OP
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Ok, thanks all. Think I will start at 18 and go from there. Made multiple changes since last time out, so it's "guess-o-matic" On many fronts. Just trying not to do something stupid - AGAIN

Fastest 300
Re: tire pressure [Re: Crizila] #1546607
12/12/13 08:34 PM 12/12/13 08:34 PM
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Renton Washington
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Triple Threat Offline
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Renton Washington
Why are you ditching the tubes? In my experience heavier cars like them.

-Dustin
67 Dart, 9 second, 392" G3 Hemi
68 Barracuda 340 F/SA
Re: tire pressure [Re: Crizila] #1546608
12/12/13 08:59 PM 12/12/13 08:59 PM
Joined: Mar 2006
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MI, usa
dvw Offline
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Quote:

Was running 14 lbs with tubes in my 29X13.5/15 Hoosiers QT's. Gonna start the season with the same tires, but tubeless. Thinking of starting around 20 lbs?



They may need more but I doubt 20. I personally have never seen anyone run 20 PSI in a bias slick that large, maybe 15-16
Doug
Re: tire pressure [Re: Triple Threat] #1546609
12/12/13 10:46 PM 12/12/13 10:46 PM
Joined: Oct 2003
Posts: 7,506
Az
Crizila Offline OP
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Quote:

Why are you ditching the tubes? In my experience heavier cars like them.

I might go back to them, but I was having "rim creep" at 14 lbs and was concerned about swallowing a valve stem. Don't wanna use screws. Could have glued them, which is what I have done when I mounted them back up without the tubes. Next outing is first week in January, so I guess I will see then.

Fastest 300
Re: tire pressure [Re: Crizila] #1546610
12/13/13 03:12 AM 12/13/13 03:12 AM
Joined: Aug 2003
Posts: 43,157
Bend,OR USA
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Cab_Burge Offline
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If those tires are not directional how about rotating them every other race to stop and reverse the tire movement I've done that in the past on tubeless tires, mark the bead at the valve stem and watch the movement, when it has moved 1 to 2 inche switch sides and wait until it goes 1 inch past the original marks the other way and then swap them again another option is to use screws on the inside only

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: tire pressure [Re: Cab_Burge] #1546611
12/13/13 01:46 PM 12/13/13 01:46 PM
Joined: Jul 2004
Posts: 19,317
State of confusion
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Thumperdart Offline
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Quote:

If those tires are not directional how about rotating them every other race to stop and reverse the tire movement I've done that in the past on tubeless tires, mark the bead at the valve stem and watch the movement, when it has moved 1 to 2 inche switch sides and wait until it goes 1 inch past the original marks the other way and then swap them again another option is to use screws on the inside only



I`d run screws myself and screws on the inside only have proven to not be the answer. There`s some videos and posts on the bullet talking about this and even mentions having the inside and outside screws be in the exact location. It was also mentioned that the amount of screws determins how the tire "wads up" and the length of those wads................

Last edited by Thumperdart; 12/13/13 01:47 PM.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: tire pressure [Re: Thumperdart] #1546612
12/13/13 02:29 PM 12/13/13 02:29 PM
Joined: Jan 2003
Posts: 32,394
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Quicktree Offline
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is this pressure while you are street racing or at the track?

Re: tire pressure [Re: Quicktree] #1546613
12/13/13 02:48 PM 12/13/13 02:48 PM
Joined: Jul 2004
Posts: 19,317
State of confusion
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Thumperdart Offline
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Quote:

is this pressure while you are street racing or at the track?



I don`t street race............YET! What pressures r u refering too?

72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
Re: tire pressure [Re: Quicktree] #1546614
12/13/13 03:48 PM 12/13/13 03:48 PM
Joined: Oct 2003
Posts: 7,506
Az
Crizila Offline OP
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Crizila  Offline OP
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Quote:

is this pressure while you are street racing or at the track?

. Good idea on the tire rotation Cab. Already got them marked.

Fastest 300
Re: tire pressure [Re: Thumperdart] #1546615
12/13/13 03:53 PM 12/13/13 03:53 PM
Joined: Oct 2003
Posts: 7,506
Az
Crizila Offline OP
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Crizila  Offline OP
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Az
Quote:

Quote:

If those tires are not directional how about rotating them every other race to stop and reverse the tire movement I've done that in the past on tubeless tires, mark the bead at the valve stem and watch the movement, when it has moved 1 to 2 inche switch sides and wait until it goes 1 inch past the original marks the other way and then swap them again another option is to use screws on the inside only



I`d run screws myself and screws on the inside only have proven to not be the answer. There`s some videos and posts on the bullet talking about this and even mentions having the inside and outside screws be in the exact location. It was also mentioned that the amount of screws determins how the tire "wads up" and the length of those wads................

Ya Dom, was running screws on both sides and same location per your thread. Just don't want to screw my new Convo Pros if I don't have to. BTW, got a screw locating disc for 15" wheels if anyone ever needs to borrow it.

Fastest 300
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