driveshaft question
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driveshaft question
My friend replaced his driveshaft, I guess one of the u joints was too stiff and not moving correctly. Replaced the driveshaft.. How much difference would this bad drive shaft make on a quarter mile time? Or in other words any idea how much HP the bad driveshaft ate up?
Thanks
Thanks
#3
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Actually driveshafts make a significant difference in the way a car accelerates! If the shaft wasn't spinning freely before then the car wasn't accelerating like it should've. With the new shaft it should remedy that...also remember the lighter the component the better the acceleration (thus you can get a carbon fiber driveshaft) due to less rotational inertia to overcome. Basically if the shaft is bad then not all of the power is going to the wheels (drivetrain loss increases...that's what rwhp is all about, how much is lost through the drivetrain).
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Originally posted by KiyoKix
Actually driveshafts make a significant difference in the way a car accelerates! If the shaft wasn't spinning freely before then the car wasn't accelerating like it should've. With the new shaft it should remedy that...also remember the lighter the component the better the acceleration (thus you can get a carbon fiber driveshaft) due to less rotational inertia to overcome. Basically if the shaft is bad then not all of the power is going to the wheels (drivetrain loss increases...that's what rwhp is all about, how much is lost through the drivetrain).
Actually driveshafts make a significant difference in the way a car accelerates! If the shaft wasn't spinning freely before then the car wasn't accelerating like it should've. With the new shaft it should remedy that...also remember the lighter the component the better the acceleration (thus you can get a carbon fiber driveshaft) due to less rotational inertia to overcome. Basically if the shaft is bad then not all of the power is going to the wheels (drivetrain loss increases...that's what rwhp is all about, how much is lost through the drivetrain).
#5
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Most definately, if the driveshaft really wasn't spinning all that great before you WILL notice the difference quite well. Same for the carbon shaft, it's kinda like installing a new lightweight flywheel if you've done that before. You'll see the car revs faster, thus faster acceleration. All of these things are the same, lightweight rotors, driveshafts, and flywheels it's just that most people don't think of things on the darkside of the car (out of sight out of mind). If those things aren't working right then you can pretty much stop spending money on the mods for your car because you'll never get the full potential anyway.
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It made quite a difference and added almost 5 mph per gear more.
I assume we were losing around 30% to drivetrain loss compared to 15 to 18% from a normal working car.
I assume we were losing around 30% to drivetrain loss compared to 15 to 18% from a normal working car.
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#10
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I replaced mine in my n/a 88 SE with one from a TII
Who makes a CF drifeshaft? I really doubt that it could be *that* much lighter than a stock one. I was really suprised at how light the stock driveshaft is...
Most definately, if the driveshaft really wasn't spinning all that great before you WILL notice the difference quite well. Same for the carbon shaft, it's kinda like installing a new lightweight flywheel if you've done that before. You'll see the car revs faster, thus faster acceleration. All of these things are the same, lightweight rotors, driveshafts, and flywheels it's just that most people don't think of things on the darkside of the car (out of sight out of mind). If those things aren't working right then you can pretty much stop spending money on the mods for your car because you'll never get the full potential anyway.
-Gabe
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If you can I would replace the small u joint that come on the stocker. Replace them with a unit with a grease fitting. They are so small its a wonder they hold like they do.
I heard that the original u joints that are a no maintenance joint last longer than the ones you can put grease into and service.
Is this true?
I heard that the original u joints that are a no maintenance joint last longer than the ones you can put grease into and service.
Is this true?
#17
How about a custom light aluminum shaft? What would the weight diff. be from the stocker?
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Originally posted by 1FastT2
I totally agree but do you really think its going to make a big difference?
I totally agree but do you really think its going to make a big difference?
#20
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Hot American cars...what cars are you talking about, and what in what America do they make "hot cars"?!? Not to bash on American cars (after all...I AM American ), but as far as I'm concerned there really aren't any hot cars made in America (save a few "high dollar" cars).
By the way, I argree the stock driveshaft is pretty darn light to start with.
By the way, I argree the stock driveshaft is pretty darn light to start with.
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Originally posted by KiyoKix
Hot American cars...what cars are you talking about,
Hot American cars...what cars are you talking about,
The factory Rx-7 shaft isn't all that heavy but it is very short. A lighter one would help but not all that much. Especially at low speeds where the shaft is spinning very slowly. But when it comes to racing every little bit helps.
I replaced my drive shaft that bad u-joints with a new shaft from mazdatrix. Didn't really notice any difference in acceleration (less vibration though). Would need timing equiptment to measure the gains I guess.
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