This is topic Airing down BFG Comp T/A's??? in forum Tech Talk at Northern California Ford Owners  .


To visit this topic, use this URL:
https://californiafords.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=6;t=003669
Posted by hopdup95 (Member # 2381) on :
 
Hey, my friend and I just got a pair of 275 comp t/a's on 15 X 10 inch rims. We were wondering how much to air them down when we run them at the track. Can someone help us out??? Thanks.
 
Posted by Fast477Mach1 (Member # 2559) on :
 
Airing a street tire down very much usually results in the rim spinning on the tire and always weakens the carcus of the tire. Its your tires but you might want to get slicks instead of weakening your T/A's
 
Posted by hopdup95 (Member # 2381) on :
 
So then I guess i'll just leave them at the suggested PSI. Thanks.
 
Posted by Fast477Mach1 (Member # 2559) on :
 
Its just my experience someone else might do it but it just would be expensive if it didnt work ya know
 
Posted by RiddlerGT (Member # 113) on :
 
i ran my drag radials at 15psi no rim spin at all.. and this is on a 5000 pound truck
 
Posted by Fast477Mach1 (Member # 2559) on :
 
Well....does anyone else notice that people usually lag bolt the tires to the rims when they drop pressure or run a lot of power. Theres a reason for that. What does happen though is the steel cords in the sidewall will begin to break. And the sidewall takes the most pressure on a tire so dropping pressure, driving on it, then airing them back up is very bad. Sometimes you will hear cords popping when you air it up again. When it does go it will probably be when your doing that.

[ April 07, 2003, 02:04 PM: Message edited by: Fast477Mach1 ]
 
Posted by Chris M. (Member # 1708) on :
 
people run mid 9s on a 275 drag radial, some of them have wheel screws holding them on like Fast477Mach1 pointed out.
I wouldn't worry about the steel chords since those tires shouldn't last you more than 2 months.
 
Posted by TRY2PAZ (Member # 97) on :
 
You can air down your tires if you want. i use to run my street tires at 25psi. I would not go any lower than that. It made a minor differance.
Try it out for yourself, and see what happens. Just to let you know, doing a burn out, is a wiast of time on street tires
 
Posted by Andrew WOT (Member # 1249) on :
 
From http://www.tirerack.com/tires/tires.jsp?tireMake=BFGoodrich&tireModel=Comp+T%2FA+Drag+Radial

quote:

It is also important to remember that the Drag Radial operates most efficiently on the strip at cold inflation pressures of between 15psi and 20psi (in no case should below 12psi be used). And after the racing is done for the day, it is essential that Drag Radials be reinflated to normal highway operating pressures in order to safely bring the driver and trophy back home. Running any tire at relatively low inflation pressure for a given load reduces the tire's speed capability by causing it to stretch more and operate at a high deflection (more radial bulge). The Drag Radial is built to withstand brief "bursts" of high speed while inflated at low pressure (such as would be experienced on a quick car in the quarter-mile), but no tire can be expected to survive for a long time at high speed while operating at high deflection. To date, the Comp T/A Drag Radial has been successfully used on cars with quarter-mile ETs in the low 9-second range, and trap speeds in excess of 150mph.

 
Posted by hopdup95 (Member # 2381) on :
 
Thank you guys for all the info. The BFG website is probably a pretty good source of info so I guess we'll just test them out to see what works best. Thanks again.

[ April 08, 2003, 08:46 AM: Message edited by: hopdup95 ]
 
Posted by Chris M. (Member # 1708) on :
 
the cars running low 8s air them down under 10 psi. it all depends on your car, see what your car likes best, you want the highest pressure you can with your best 60'

airing them back up isn't a big issue since they will only last you about a month or two.
 
Posted by hopdup95 (Member # 2381) on :
 
So how about roasting them before the line??? should they be smoked a lot, a little, or not at all before running. Thanks again for all the info.
 
Posted by 1LETHALSVT (Member # 1541) on :
 
how long will a pair of drag radials last
 
Posted by HungryHippo (Member # 537) on :
 
are these drag radials are regular street tires?
 
Posted by hopdup95 (Member # 2381) on :
 
They're drag radials. I know that roasting street tires is a waste of time other than being fun because it brings all the oil that they gather up while driving around to the surface of the tire and can make it worse.
 
Posted by twstd50 (Member # 1981) on :
 
Hey what's up???

You guys bought those from me. The one time I used them, the pressure was at 16psi and It kinda bogged my engine down. I'm not saying that this will happen to your car though.
 
Posted by HungryHippo (Member # 537) on :
 
in that case, yes, you do need to lower the pressure and do a burnout to heat them up. try 20 psi and a 4-5 second burnout.
 
Posted by hopdup95 (Member # 2381) on :
 
All righty cool. We'll have to try different PSI's and see which work the best.
 




Fueled by Ford Mustang Owners
on CaliforniaFords.com