stick racers-flywheel inertia and gearing???s

rickster · 10-29-2007, 05:00 PM

i have a 33-3400# 69 camaro that is a drive to the track street/strip car,motor made 752hp at 6400 and 670 ft lbs at 5200,548" pump gas bbc,the trans is a g-force 101 4 speed [2.98 first],i have 4.29's out back,32" tire with double adj coilovers and ladders.just got the car to the track last week,best pass after finding a decent clutch tune [10.5 sintered],10.05 at 135 with a lousy 1.43 60'er,1/8 mile is 6.42 at 109+

i launch the car at around 6000,and it quickly pulls the motor down to around 4000,and obviously struggles to recover,except for those runs with clutch or tire spin,which don't help the 60' much

i will go as far as a 4.71 rear gear as i can still go 60 on the highway and only turn 3000,and turn 6800 IF i ever get 137 mph in the traps

does anyone have a good simulation program that will tell me what 60' improvement can be had with this gearchange ???

also,can switching to a steel flywheel with more stored energy keep the rpm's from dropping to 4000,or is the effect really only good for a few hundred rpm's????

thanx

rickster · 10-29-2007, 06:11 PM

only thing about that is my counterweights will kick in and provide too much clutch

Arnold Greene · 10-29-2007, 07:09 PM

It appears that you have too much base pressure to launch at 6000 rpm. You might try 5000 and see where the rpm comes back to. You will get your best times with the engine pulling back 200 rpm or less. Otherwise, you will have to have a data logger to get close on the clutch set up.

Jeff Lee · 10-30-2007, 01:22 AM

I would suggest you contact Rob Youngblood @ www.advancedclutches.com. He will sell you the right parts and his consultation to his customers is absolutely invaluable.
He'll show you how to make that 135 turn into at least a 9.60. You've probably spent a ton of money on the car thus far. Now it's time to make it work with the right clutch!
Good luck.
Try the http://www.umtrnorth.com/ forum also. That's the United Manual Transmission forum also.

rickster · 10-31-2007, 07:47 AM

thanx for the replies!!!

10-29-2007, 05:00 PM	#1
rickster Junior Member Join Date: Nov 2004 Location: torrington,ct Posts: 13 Likes: 0 Liked 0 Times in 0 Posts	stick racers-flywheel inertia and gearing???s i have a 33-3400# 69 camaro that is a drive to the track street/strip car,motor made 752hp at 6400 and 670 ft lbs at 5200,548" pump gas bbc,the trans is a g-force 101 4 speed [2.98 first],i have 4.29's out back,32" tire with double adj coilovers and ladders.just got the car to the track last week,best pass after finding a decent clutch tune [10.5 sintered],10.05 at 135 with a lousy 1.43 60'er,1/8 mile is 6.42 at 109+ i launch the car at around 6000,and it quickly pulls the motor down to around 4000,and obviously struggles to recover,except for those runs with clutch or tire spin,which don't help the 60' much i will go as far as a 4.71 rear gear as i can still go 60 on the highway and only turn 3000,and turn 6800 IF i ever get 137 mph in the traps does anyone have a good simulation program that will tell me what 60' improvement can be had with this gearchange ??? also,can switching to a steel flywheel with more stored energy keep the rpm's from dropping to 4000,or is the effect really only good for a few hundred rpm's???? thanx

10-29-2007, 06:11 PM	#2
rickster Junior Member Join Date: Nov 2004 Location: torrington,ct Posts: 13 Likes: 0 Liked 0 Times in 0 Posts	Re: stick racers-flywheel inertia and gearing???s only thing about that is my counterweights will kick in and provide too much clutch

10-29-2007, 07:09 PM	#3
Arnold Greene Member Join Date: Mar 2003 Posts: 135 Likes: 0 Liked 3 Times in 2 Posts	Re: stick racers-flywheel inertia and gearing???s It appears that you have too much base pressure to launch at 6000 rpm. You might try 5000 and see where the rpm comes back to. You will get your best times with the engine pulling back 200 rpm or less. Otherwise, you will have to have a data logger to get close on the clutch set up. __________________ Arnold Greene IHRA/NHRA 2420 A/S, B/S

10-30-2007, 01:22 AM	#4
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 3 Times in 3 Posts	Re: stick racers-flywheel inertia and gearing???s I would suggest you contact Rob Youngblood @ www.advancedclutches.com. He will sell you the right parts and his consultation to his customers is absolutely invaluable. He'll show you how to make that 135 turn into at least a 9.60. You've probably spent a ton of money on the car thus far. Now it's time to make it work with the right clutch! Good luck. Try the http://www.umtrnorth.com/ forum also. That's the United Manual Transmission forum also. __________________ Jeff Lee 7494 D/S '70 AMX

10-31-2007, 07:47 AM	#5
rickster Junior Member Join Date: Nov 2004 Location: torrington,ct Posts: 13 Likes: 0 Liked 0 Times in 0 Posts	Re: stick racers-flywheel inertia and gearing???s thanx for the replies!!!