Buck531 Posted December 9, 2004 Report Share Posted December 9, 2004 FWD auto, or a RWD auto? or are they the same.. Trying to prove a point to my friend. I'm pretty sure it's FWD.... Quote Link to comment Share on other sites More sharing options...
Tractor Posted December 9, 2004 Report Share Posted December 9, 2004 I'm thinking its FWD also. Evan Quote Link to comment Share on other sites More sharing options...
controler Posted December 9, 2004 Report Share Posted December 9, 2004 I would think it'd be the rwd simply because of the added weight of unsprung weight. Quote Link to comment Share on other sites More sharing options...
BiG BeN Posted December 9, 2004 Report Share Posted December 9, 2004 i was kinda thinkin rwd too, because of the extra weight and the 90degree change in direction at the differential. hard to say for sure though. Quote Link to comment Share on other sites More sharing options...
street pilot Posted December 10, 2004 Report Share Posted December 10, 2004 Originally posted by BiG BeN: i was kinda thinkin rwd too, because of the extra weight and the 90degree change in direction at the differential. hard to say for sure though. Exactly what I would guess. Quote Link to comment Share on other sites More sharing options...
CobraKevin Posted December 10, 2004 Report Share Posted December 10, 2004 Put it on a dyno and find out, lazy bastard. smile.gif I don't know, I always thought the more drivetrain the power had to be transferred through, the more power that would be lost in transition. Just a guess, though. Quote Link to comment Share on other sites More sharing options...
OGRE Posted December 10, 2004 Report Share Posted December 10, 2004 FWD is typically less efficient than RWD. A good example is that honda Manual trannies typically lose 20%!!!! Quote Link to comment Share on other sites More sharing options...
Mr.COS Posted December 10, 2004 Report Share Posted December 10, 2004 You're spinning a driveshaft and a rear diff with a RWD. A RWD has more loss. Quote Link to comment Share on other sites More sharing options...
Conesmasher Posted December 10, 2004 Report Share Posted December 10, 2004 Originally posted by Shrek: FWD is typically less efficient than RWD. A good example is that honda Manual trannies typically lose 20%!!!! I've seen mainly in the range of 14-15% Quote Link to comment Share on other sites More sharing options...
Buck531 Posted December 10, 2004 Author Report Share Posted December 10, 2004 Right now I'm at 22% loss. What are the RWD auto's loss? Quote Link to comment Share on other sites More sharing options...
Mowgli1647545497 Posted December 10, 2004 Report Share Posted December 10, 2004 The rule of thumb loss for the T56 and IRS equipped Cobras has been 12-16% Quote Link to comment Share on other sites More sharing options...
BiG BeN Posted December 10, 2004 Report Share Posted December 10, 2004 Originally posted by B1ackout: Put it on a dyno and find out, lazy bastard. smile.gif I don't know, I always thought the more drivetrain the power had to be transferred through, the more power that would be lost in transition. Just a guess, though. the only good way to do that though is to have identical engines configured for FWD,and RWD then dyno them on an engine dyno, and again on a chassis dyno. Quote Link to comment Share on other sites More sharing options...
Drunkendubber Posted December 10, 2004 Report Share Posted December 10, 2004 Originally posted by BiG BeN: the only good way to do that though is to have identical engines configured for FWD,and RWD then dyno them on an engine dyno, and again on a chassis dyno.sounds like we need ourselves a DSM we can do it the hillbilly way and just unhook drive shafts Quote Link to comment Share on other sites More sharing options...
1Quik7 Posted December 10, 2004 Report Share Posted December 10, 2004 i would think that RWD is less, the loss relies on the amount of parasitic drag produced by friction, one way to overcome friction would be to increase the torque applied...in the instance of RWD you have the long shaft which increases the mechanical advantage and thus rotational torque. i might be a genious or just plain retarded. Quote Link to comment Share on other sites More sharing options...
Tinman Posted December 10, 2004 Report Share Posted December 10, 2004 Originally posted by 1Quik7: i would think that RWD is less, the loss relies on the amount of parasitic drag produced by friction, one way to overcome friction would be to increase the torque applied...in the instance of RWD you have the long shaft which increases the mechanical advantage and thus rotational torque. i might be a genious or just plain retarded.Are you fucking simple? Quote Link to comment Share on other sites More sharing options...
Guest Tony_K Posted December 10, 2004 Report Share Posted December 10, 2004 RWD (assuming it has front engine) most often has more moving parts, therefore more loss due to friction. The added weight of the driveshaft and other components add to the inertia of the assembly, which affects it in a way similar to having a *heavier* flywheel. Generally, you want the fewest and lightest parts possible from crankshaft to wheels. Quote Link to comment Share on other sites More sharing options...
nathan Posted December 10, 2004 Report Share Posted December 10, 2004 RWD will have more loss, but the weight transfer under acceleration will be what makes the RWD more preferable. The less distance for the power/torque to be lost will always be the more efficient. In most cases you just cannot get the power to the ground with a front wheel drive car even though the weight is mostly over the drive wheels. Quote Link to comment Share on other sites More sharing options...
Awfulcanawful Posted December 10, 2004 Report Share Posted December 10, 2004 I would guess FWD because it is indepent suspension and not a solid axle and a lot of the losses come in the cv joints. A RWD only has one U joint and the gear power transfer is highly efficient. Quote Link to comment Share on other sites More sharing options...
Guest Spyder550 Posted December 10, 2004 Report Share Posted December 10, 2004 Originally posted by nathan96: RWD will have more loss, but the weight transfer under acceleration will be what makes the RWD more preferable. The less distance for the power/torque to be lost will always be the more efficient. In most cases you just cannot get the power to the ground with a front wheel drive car even though the weight is mostly over the drive wheels. +1 Assuming the same auto trans, power loss through this item will be roughly 50HP. Spinning a driveshaft will cause torque to be lost in simply moving that mass. Assuming suspension characteristics are roughly equal, i.e. independent suspension, I don't believe that will be a factor. Therefore, more loss in RWD, generally. If you want to argue real world performance, weight transfer will help a RWD car hook up and work the same way against a front driver. Also, in extreme handling situations, breaking up the work done by the wheels will help car go faster around a road course because all the fronts have to do is steer, not also deal with the acceleration forces. So... Given equal engines, transmissions, and suspension, a RWD should always be faster in the real world. Driver skill could cancel these advantages, though. Quote Link to comment Share on other sites More sharing options...
Guest Spyder550 Posted December 10, 2004 Report Share Posted December 10, 2004 Originally posted by Awfulcanawful: I would guess FWD because it is indepent suspension and not a solid axle and a lot of the losses come in the cv joints. A RWD only has one U joint and the gear power transfer is highly efficient. A rear driver with independent rear suspension will not have a solid axle. CV joints will connect the halfshafts or transmission to the rear axles. Quote Link to comment Share on other sites More sharing options...
Dave1647545494 Posted December 10, 2004 Report Share Posted December 10, 2004 the difference between the two is negligeble figure 20% minimum either way for autos figure 15% minimum for stick the real loser in powertrain loss is awd and 4wd. it can be 25% or higher auto or stick Quote Link to comment Share on other sites More sharing options...
Doug1647545489 Posted December 10, 2004 Report Share Posted December 10, 2004 rwd in gerneral will have more loss. Mainly because of the driveshaft. Quote Link to comment Share on other sites More sharing options...
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