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Author
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Topic: Question on Braket times....
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H8CHEVY
Gearhead Posts: 200
From: Southern Cali
Registered: Jun 2000
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posted 08-05-2001 03:25 PM
   
I put some Mickey T's on my car for 1/8 mile drags... I noticed that my 60 Foot times hadnt improved much from my street tire times, which was with little to no traction. I was wondering since the overall diameter of the Mickeys was about 4" larger, that hurts my gear ratio??? Also has anyone ran like a real large width tire like a BFG radial and had little wheel spin from it? Does anyone have some helpful suggestions??
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Toronado3800
Journeyman Posts: 63
From: St. Louis, MO
Registered: Jul 2001
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posted 08-05-2001 07:22 PM
yeah, putting on a taller tire creates the effect of a numerically lower gear. Interestingly enough a taller tire (ie 275/75/15 vs 275/50/15) has a larger contact patch than the shorter tire. I used a program once to help me figure out some of the effects of different size tires I'll see if I can find a link to a download site.
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H8CHEVY
Gearhead Posts: 200
From: Southern Cali
Registered: Jun 2000
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posted 08-05-2001 07:45 PM
lemme know that would be great... !
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steve'66
Gearhead Posts: 3653
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 08-06-2001 11:11 AM
Are you heating those et streets up? They need about a 20 second burnout 'til the smoke is rolling off them.  SteveW
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H8CHEVY
Gearhead Posts: 200
From: Southern Cali
Registered: Jun 2000
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posted 08-08-2001 09:29 PM
hey steve they are the M/T Sportsman tires... not the full slick.. still need 20seconds??? they are alot better than my 225/50's though!!
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bluestreek
Gearhead Posts: 607
From: Athens,GA
Registered: Jul 2001
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posted 08-09-2001 08:43 AM
Are they Sportsman or Sportsman Pro ?? The Sportsman Pro has sticky compound and 2-ply wrinkle walls.. The Sportsman is just a good bias ply street tire.. The Pros definately need a good burnout like the slicks and should be good for sub 1.8 sec. 60' with 4.11 gear or better...
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H8CHEVY
Gearhead Posts: 200
From: Southern Cali
Registered: Jun 2000
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posted 08-11-2001 10:46 PM
No they are not the pros.. I have a 3.50 gear with trac lok and still cant get a great 60 ft time.... 
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Ken&Shell
Gearhead Posts: 236
From: Mocksville, NC
Registered: May 2000
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posted 08-13-2001 07:23 PM
quote:
Originally posted by steve'66:
Are you heating those et streets up? They need about a 20 second burnout 'til the smoke is rolling off them. SteveW
I have never, ever done a 20 second burnout to heat my tires up. Were you spinning on your street tires and that's why you moved up to M/T or just changed to get better your 60' times. I had 3.50 gears in my capri last year and ran M/T slicks and had decent 60' times. What are your 60' times? Shell
Ladyracer
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H8CHEVY
Gearhead Posts: 200
From: Southern Cali
Registered: Jun 2000
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posted 08-13-2001 07:34 PM
Shell, yes I was spinning my street tires so much! My 60 ft times are consistantly around 2.2sec, on my street tires they were around 2.5sec... I need a tire that is shorter in height i think??? but they dont have any with width that are short.... right?
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Colt351
Journeyman Posts: 12
From: Stockton, Ca USA
Registered: Aug 2001
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posted 08-13-2001 08:29 PM
I know this might sound stupid but my 60 foot time is about 2.1 to 2.2 seconds and I run street tires 245/45/17 and I dont even burn out. Have you ever tried to not burn out?
It seems when I burn out with street tires they spin more off the line.
If I dont burn out I also notice after I run a couple of times that the sticky rubber builds up on the tire a provides better traction for the next runs.
Good Luck!!
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bluestreek
Gearhead Posts: 607
From: Athens,GA
Registered: Jul 2001
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posted 08-13-2001 10:38 PM
The secret to a street tire burnout is to go around the water box and back into the burnout box without pulling into the water.. You just want to find a spot wet enough to get both tires to turn over..You have to look out of your door or use your mirror to make sure that both tires are spinning.. Smokem up and then burn the tires all the way to the staging lane.. The hot spinning tires will pick up compound along the way.. Then do a test punch for traction.. If it doesn't feel like it is sticking, then back up and try it again.. After a few good runs and burnouts, you should start to feel the compound on the tires and see it stuck all over both rear panels.. Stay out of any dirt or water until you get through racing..
The best I have ever seen on stiffwall street tires was 1.80 60', and that was with a 67 Mustang with an automatic, a 3000 stall converter, Detroit locker w/ 3.73 gear, and stiff rear springs with a low arch to help keep the tires planted.. I was running 29" tall 8" wide GY Eagle STs and If I didn't heat em up I would only get 1.95 60'.. Stiff rear springs helped out a lot by not allowing the rearend to rise when the traction bars load.. My current 66 4 spd Mustang just raises up the rearend instead of planting the tires and only has a best 60' of 2.1.. The rear springs are shot!! I am in the process of getting a good set of rear springs and building a 4.44 rear chunk with a spool.. That should get the 4spd off the line!! 
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H8CHEVY
Gearhead Posts: 200
From: Southern Cali
Registered: Jun 2000
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posted 08-13-2001 11:44 PM
would raising the front end back up to stock height help the weight transfer to the back end for a better launch??? also has anyone experimented with street tires to see which brand sticks the best?? thanks!
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