Front skinnies

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chillent

chillent

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Got my skinnies mounted today ... clearance issues but that's another story.

What tires pressures are you all running? Max pressure listed on the tire or something less?
 
I ran my 26" tall fronts at 30. I now have 24" fronts so I'll have to play with them some.
 
I'm running 155R14 up front @35 psi, the higher psi the better, easier turning & less rolling resistance.
 
I run 42 lbs in my 15' skinnies cant remember the size they are . but the ware is nice and even .
 
jimjimjimmy said:
I run 42 lbs in my 15' skinnies cant remember the size they are . but the ware is nice and even .
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Wow! That's alot! I have new Phoenix race skinnies and max pressure on sidewall is 32 psi ... think I'll go there and see how it feels on the top end!

Thank for all the input !
 
PSI of your tire is mostly determined by the weight of the car, front and rear.

To figure out what is needed up front, the weight of the front of the car is divided by two. This gives you the load per side of the front of the car.

There is a rating on the tire that gives you PSI per pound of car.

Example 1600lbs at 50 psi meas that the tire can handle that max load at that max PSI.

dividing 1600 by 50 = 32 lbs of weight per PSI of inflation. This is your factor.

If your front end weighs 2000lbs then you divide that in 2.
1000lbs per side divided by 32 lbs/psi = 31.5psi/front tire.
 
my bracket race front was a moroso 9.50x15. now here's the tip of the day. air those puppies up to 40psi to race. if you are getting to close to red lighting lower them to 15psi.
 
momoparman said:
PSI of your tire is mostly determined by the weight of the car, front and rear.

To figure out what is needed up front, the weight of the front of the car is divided by two. This gives you the load per side of the front of the car.

There is a rating on the tire that gives you PSI per pound of car.

Example 1600lbs at 50 psi meas that the tire can handle that max load at that max PSI.

dividing 1600 by 50 = 32 lbs of weight per PSI of inflation. This is your factor.

If your front end weighs 2000lbs then you divide that in 2.
1000lbs per side divided by 32 lbs/psi = 31.5psi/front tire.
Click to expand...

Awesome detail! :thumbsup:
 
Thanks,

My buddy owns a tire shop, so he pumps me full of useful? information like that. He always quick to point out, the second my tires need replacing.
 
I have Mickey Thompson 25x4x15's up front. I run them at 40psi during the day . After dark I go down to 38.5 to slow down my reaction time.
 
Ok I'll bite..... How does less tire pressure effect reaction time? Unless you guys are consistantly cutting. 0011 lights.... Lol
 
mbaird said:
Ok I'll bite..... How does less tire pressure effect reaction time? Unless you guys are consistantly cutting. 0011 lights.... Lol
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The tire is shorter, lengthens RT by about .01 After dark the bulbs on the tree are brighter and it shortens my physical reaction time. I used to red light a lot 1st round after dark until I did this. Nothing more frustrating than putting yourself in the trailer by going red by -.005 or -.003! Some people use a tinted visor after dark but I've never tried that. Around here if you don't turn consistent .01 lights in no electronics classes you don't win. The guys with electronics always seem to be in the double zeros! Some good tree people around my area.
 
RockinRobin said:
The tire is shorter, lengthens RT by about .01 After dark the bulbs on the tree are brighter and it shortens my physical reaction time. I used to red light a lot 1st round after dark until I did this. Nothing more frustrating than putting yourself in the trailer by going red by -.005 or -.003! Some people use a tinted visor after dark but I've never tried that. Around here if you don't turn consistent .01 lights in no electronics classes you don't win. The guys with electronics always seem to be in the double zeros! Some good tree people around my area.
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this just proves there is a science to drag racing more than just shoving your foot to the floor .
 
RockinRobin said:
The tire is shorter, lengthens RT by about .01 After dark the bulbs on the tree are brighter and it shortens my physical reaction time. I used to red light a lot 1st round after dark until I did this. Nothing more frustrating than putting yourself in the trailer by going red by -.005 or -.003! Some people use a tinted visor after dark but I've never tried that. Around here if you don't turn consistent .01 lights in no electronics classes you don't win. The guys with electronics always seem to be in the double zeros! Some good tree people around my area.
Click to expand...

Just to clarify so someone doesn't misinterpret the tire statement:

* Less air does make the tire shorter and the tire stays in the beams longer, BUT, it's shorter because less air creates a longer "flat" area at the bottom that the starting line lights "see", so it blocks the beams longer. More air "lifts" the tire and makes it rounder, so there is less tire length that the lights see and results in slightly quicker reaction times.

* When it comes to the actual "manufactured" tire height, at the same air pressure, a shorter 26" tire will produce slightly faster RT's than a 27" tire. If you're in the ballpark, you can then fine tune RT's based on the previous info with air pressure.
 
Locomotion said:
Just to clarify so someone doesn't misinterpret the tire statement:

* Less air does make the tire shorter and the tire stays in the beams longer, BUT, it's shorter because less air creates a longer "flat" area at the bottom that the starting line lights "see", so it blocks the beams longer. More air "lifts" the tire and makes it rounder, so there is less tire length that the lights see and results in slightly quicker reaction times.

* When it comes to the actual "manufactured" tire height, at the same air pressure, a shorter 26" tire will produce slightly faster RT's than a 27" tire. If you're in the ballpark, you can then fine tune RT's based on the previous info with air pressure.
Click to expand...
Thanks for that clarification, I tend to oversimplify.
 
And there is a guy that KNOWS!!!!

Locomotion said:
Just to clarify so someone doesn't misinterpret the tire statement:

* Less air does make the tire shorter and the tire stays in the beams longer, BUT, it's shorter because less air creates a longer "flat" area at the bottom that the starting line lights "see", so it blocks the beams longer. More air "lifts" the tire and makes it rounder, so there is less tire length that the lights see and results in slightly quicker reaction times.

* When it comes to the actual "manufactured" tire height, at the same air pressure, a shorter 26" tire will produce slightly faster RT's than a 27" tire. If you're in the ballpark, you can then fine tune RT's based on the previous info with air pressure.
Click to expand...

So loco, how does the season go?
 
rumblefish360 said:
And there is a guy that KNOWS!!!!



So loco, how does the season go?
Click to expand...

3 wins, 3 runner-ups and a semi with one more race to try & improve on the semi. (Best 7 of up to first 10 races count.) Good lead in IHRA Stock, but not quite a sure thing yet.
 
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