traction and tires

Old 02-18-2009, 02:19 PM
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robsbird
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Default traction and tires

:lol: :lol: 8) 8) discuss the tire that has worked best for you. I have a 68 roadrunner 542ci about 900 hp 4 link 3200 lb w/o driver 1.34 60 6.teens 1/8. but I don,t think my car hooks its best. I have 32/16/15 MT s/ wall med compound. have adjusted a million settings and nothing really changes much. The car does ok but I think something is not just right. Its a foot brake 5000 8" convertor. big lift and duration roller. rob
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Old 02-18-2009, 02:43 PM
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BEAST477
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I don't think your times are too bad for 3400 lbs and foot braking.JMO
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Old 02-18-2009, 03:56 PM
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robsbird
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Default tire speed

:arrow:beast It seems like I have to much tire spin, it does ok I just think it should do better. occasionally It will whellie the front about 3 or 4 inch and I have about 11 inch (8 inch lift) I guess. maby of front suspension travel. I also footbrake and im thinking about going to a transbrake. I read that a 4 link works best by shocking the susp. but if changing tires would do it that would be better.
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Old 02-18-2009, 04:10 PM
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Harbone
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get the transbrake and you will be more than happy! all that horsepower with that setup and you will get the results you want.
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As close to "Normal" as I can get...
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Old 02-18-2009, 06:11 PM
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chevynovaman
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Default TRACTION

IF YOUR FOOT BRAKING NOW AND SPINNING, TRANS-BRAKE IS GOING TO BE PUSHING WAY MORE RPMS THAN FOOT BRAKING.. MY CAR IS 485 HP 3000 LB NOVA AND RUNS 1.50'S 60' AND LOW 7.0 EIGHTHS. FOOT BRAKING.. IS IT A POSSIBILLITY THAT YOUR CONVERTER IS TO BIG AND YOUR THROWING ALL YOUR 900 HP AND TQ OUT THE WINDOW BECAUSE YOUR BYPASSING ALL YOUR TORQUE RANGE. YOU COULD TRY TO RUN A HIGHER GEAR RATIO TO USE MORE TORQUE.. THAT SHOULD RUN WAY FASTER THAN THAT... BEST OF LUCK ON YOUR TRACTION
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Old 02-18-2009, 06:42 PM
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robsbird
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Default tire spin

thanks harbone and nova , I bought this car rolling and built the motor I had the trans built useing tci trans parts, the last part I bought was the converter. I gave tci all the info, complete engine info, tire size gear ratio etc. and this is the convertor they suggested. but I might try another one. I read that a 4 link works best with a shocking like a clutch or trans brake. I'm going to try a heavier spring rate to get more rear suspension seperation. :idea:
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Old 02-18-2009, 06:57 PM
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robsbird,sounds like you should check the fash on your converter to see where it stalls at or go to a trans break.I race a 2600#monza w/driver with a mild 400+hp355,th350 with 4500 stall converter,4.56 rear 33-15-15 d5 [email protected]#air,ladder bar set in the center hole.I leave at 3500 on a 2step my 60ft's are 1.430 and 1/8 [email protected] 98mph and 10.96 1/[email protected] 120mph RM1, check out my profile
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Old 02-18-2009, 07:48 PM
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:? rm1 define flash; when I stage, the car will push the front tire at about 3000 rpm I use the brake 4 wh disc. shift at 6800. Icalled tci and gave them this same info and they said they could not improve on the converter. is flash the rpm that moves the car or ??. thanks rob
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Old 02-18-2009, 07:56 PM
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chrisr
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To see what your converter will flash, don't push the rpm's until the car is trying to move. Stall at a lower rpm then when you leave see what the rpm's FLASH to. If you are footbraking to the point that the car is trying to push past the brakes then you are allready on the converter therefore it can not flash. Try starting out about 2000 or so and then leave and see what rpm you come up to. I hope I explained that good enough.
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Old 02-19-2009, 03:42 AM
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Do you have any starting line video?
That was we can see what is happening.
Transbrake launches usually help traction.
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