AWD Motorsports driveshaft on the BadBish
Aug 19, 2010, 08:40 PM
#18
Mike
Aug 19, 2010, 08:43 PM
#20
Just some random numbers I came up with while doing my own 2-piece shaft.
60mm 2mm wall 1020 tube (stock)
Moment of inertia (12" length) = 9.43 kg/m^4
Torsional Stiffness = 103kN-m/rad
Failure Torque = 4243 N-m
3" 0.125 wall aluminum tube
Moment of inertia (12" length) = 8.01E-04 kg/m^4
torsional Stiffness = 82kN-m/rad
Failure Torque = 7048 N-m
2.5" 0.083 wall 4130 Chromoly steel tube
Moment of inertia (12" length) = 9.18E-04 kg/m^4
torsional Stiffness = 100kN-m/rad
Failure Torque = 5557 N-m
Larger diameter aluminum OWNS on all aspects...
Even though the actual weight is only 6% less, that aluminum shaft has about 12% less inertia then the steel DEVO shaft.
It will also absorb more of the driveline shock on a launch or hard shift.
60mm 2mm wall 1020 tube (stock)
Moment of inertia (12" length) = 9.43 kg/m^4
Torsional Stiffness = 103kN-m/rad
Failure Torque = 4243 N-m
3" 0.125 wall aluminum tube
Moment of inertia (12" length) = 8.01E-04 kg/m^4
torsional Stiffness = 82kN-m/rad
Failure Torque = 7048 N-m
2.5" 0.083 wall 4130 Chromoly steel tube
Moment of inertia (12" length) = 9.18E-04 kg/m^4
torsional Stiffness = 100kN-m/rad
Failure Torque = 5557 N-m
Larger diameter aluminum OWNS on all aspects...
Even though the actual weight is only 6% less, that aluminum shaft has about 12% less inertia then the steel DEVO shaft.
It will also absorb more of the driveline shock on a launch or hard shift.
Mike
Aug 19, 2010, 09:48 PM
#22
Sorry, I had a chance to go and enjoy life tonight with Ron Shearer, Jeff Oswalt and a few other guys riding bicycles.
I'd say the coil overs over the driveshaft too. I really like the N1's and that's what's on my car, they are 36 pounds lighter than stock if I remember right. They also work very good in my opinion. Pricing is low too.
I'd say the coil overs over the driveshaft too. I really like the N1's and that's what's on my car, they are 36 pounds lighter than stock if I remember right. They also work very good in my opinion. Pricing is low too.
Aug 20, 2010, 02:20 AM
#23
Emery @ STM did back to back and I wanna say 10+.. I also had a customer who said his car was dead consistent MPH and swapped Ds and picked up 3mph in 1/4 mile.. Thats about all i can report as I should have done some back to back tests myself.. I can tell you as soon as you let out the clutch from a stop you can feel how it moves so much easier..
Mike
Mike
acpt used to have customer feedback on their site. 7 second cars were picking up .003 at the track. and that was likely from traction improvement not horsepower. on a 500whp I doubt you could even measure 1 hp difference on the dyno.
the math is just not there guys. only HP gain you will see if from shedding 12lbs weight. yes I am know its rotational mass. but in this case the mass lost is too close to centerline of rotation to make much of a difference.
700 spent is FAR FAR better spent on lighter tires . 3-4 lbs per tire will net 10-15hp. plus car will handle better because shocks are controlling less weight. brakes work better stopping less mass.
Last edited by 94AWDcoupe; Aug 20, 2010 at 02:23 AM.
Aug 20, 2010, 06:16 AM
#24
do you really believe that feedback.? 3mph? your smoking crack..
acpt used to have customer feedback on their site. 7 second cars were picking up .003 at the track. and that was likely from traction improvement not horsepower. on a 500whp I doubt you could even measure 1 hp difference on the dyno.
the math is just not there guys. only HP gain you will see if from shedding 12lbs weight. yes I am know its rotational mass. but in this case the mass lost is too close to centerline of rotation to make much of a difference.
700 spent is FAR FAR better spent on lighter tires . 3-4 lbs per tire will net 10-15hp. plus car will handle better because shocks are controlling less weight. brakes work better stopping less mass.
acpt used to have customer feedback on their site. 7 second cars were picking up .003 at the track. and that was likely from traction improvement not horsepower. on a 500whp I doubt you could even measure 1 hp difference on the dyno.
the math is just not there guys. only HP gain you will see if from shedding 12lbs weight. yes I am know its rotational mass. but in this case the mass lost is too close to centerline of rotation to make much of a difference.
700 spent is FAR FAR better spent on lighter tires . 3-4 lbs per tire will net 10-15hp. plus car will handle better because shocks are controlling less weight. brakes work better stopping less mass.
Aug 20, 2010, 07:41 AM
#26
I have been good lately. When someone posts stupid I cant always bite my tonque and sit and watch. If I have anything against AWD it would be his attitude he knows everything about the 4g63 after less than 3 years. When what he really knows is how to build a fast drag car. And he doesnt even do any of the work. He got started in this by buying Curt Browns evo 8. Which was already a low 9 second car. He has mechanics that turn the wrenches, and tuners who make the setups come together. Mike is really just a savy business man.
I will admit to having a pissee attitude to shops who boast their fast drag times as the be all end all. To me that is a very small part of what makes a car enjoyable to drive. To me the focus of building a nice car is completely shrouded by the focus of the boards attention to fast drag times. I have never built a drag car in my 30 years of building fast fun street cars. I see no point in it. i want to feel boost every day. Drag cars feel boost for a few seconds a couple times a week at best. The cost for fun ratio for a drag car is **** poor. Ask mike how many of those cars in his sig ran for more than a couple months and how much they cost to build then you might have an idea of whats going on around here.
I could go on and on but this thread is about drive shafts for sale. i shared my knowledge on it. If it doesnt sit well with you i am sorry.
I will admit to having a pissee attitude to shops who boast their fast drag times as the be all end all. To me that is a very small part of what makes a car enjoyable to drive. To me the focus of building a nice car is completely shrouded by the focus of the boards attention to fast drag times. I have never built a drag car in my 30 years of building fast fun street cars. I see no point in it. i want to feel boost every day. Drag cars feel boost for a few seconds a couple times a week at best. The cost for fun ratio for a drag car is **** poor. Ask mike how many of those cars in his sig ran for more than a couple months and how much they cost to build then you might have an idea of whats going on around here.
I could go on and on but this thread is about drive shafts for sale. i shared my knowledge on it. If it doesnt sit well with you i am sorry.
Aug 20, 2010, 08:31 AM
#28
I have been good lately. When someone posts stupid I cant always bite my tonque and sit and watch. If I have anything against AWD it would be his attitude he knows everything about the 4g63 after less than 3 years. When what he really knows is how to build a fast drag car. And he doesnt even do any of the work. He got started in this by buying Curt Browns evo 8. Which was already a low 9 second car. He has mechanics that turn the wrenches, and tuners who make the setups come together. Mike is really just a savy business man.
I will admit to having a pissee attitude to shops who boast their fast drag times as the be all end all. To me that is a very small part of what makes a car enjoyable to drive. To me the focus of building a nice car is completely shrouded by the focus of the boards attention to fast drag times. I have never built a drag car in my 30 years of building fast fun street cars. I see no point in it. i want to feel boost every day. Drag cars feel boost for a few seconds a couple times a week at best. The cost for fun ratio for a drag car is **** poor. Ask mike how many of those cars in his sig ran for more than a couple months and how much they cost to build then you might have an idea of whats going on around here.
I could go on and on but this thread is about drive shafts for sale. i shared my knowledge on it. If it doesnt sit well with you i am sorry.
I will admit to having a pissee attitude to shops who boast their fast drag times as the be all end all. To me that is a very small part of what makes a car enjoyable to drive. To me the focus of building a nice car is completely shrouded by the focus of the boards attention to fast drag times. I have never built a drag car in my 30 years of building fast fun street cars. I see no point in it. i want to feel boost every day. Drag cars feel boost for a few seconds a couple times a week at best. The cost for fun ratio for a drag car is **** poor. Ask mike how many of those cars in his sig ran for more than a couple months and how much they cost to build then you might have an idea of whats going on around here.
I could go on and on but this thread is about drive shafts for sale. i shared my knowledge on it. If it doesnt sit well with you i am sorry.
Aug 20, 2010, 08:34 AM
#29
do you really believe that feedback.? 3mph? your smoking crack..
acpt used to have customer feedback on their site. 7 second cars were picking up .003 at the track. and that was likely from traction improvement not horsepower. on a 500whp I doubt you could even measure 1 hp difference on the dyno.
the math is just not there guys. only HP gain you will see if from shedding 12lbs weight. yes I am know its rotational mass. but in this case the mass lost is too close to centerline of rotation to make much of a difference.
700 spent is FAR FAR better spent on lighter tires . 3-4 lbs per tire will net 10-15hp. plus car will handle better because shocks are controlling less weight. brakes work better stopping less mass.
acpt used to have customer feedback on their site. 7 second cars were picking up .003 at the track. and that was likely from traction improvement not horsepower. on a 500whp I doubt you could even measure 1 hp difference on the dyno.
the math is just not there guys. only HP gain you will see if from shedding 12lbs weight. yes I am know its rotational mass. but in this case the mass lost is too close to centerline of rotation to make much of a difference.
700 spent is FAR FAR better spent on lighter tires . 3-4 lbs per tire will net 10-15hp. plus car will handle better because shocks are controlling less weight. brakes work better stopping less mass.
Mike