Normal or not???

[silverspd3]

While I was checking for leaks after the test pipe install I noticed as soon as I started my car, the wheels started turning. In neutral. If I stopped them, they start right back to spinning. Anyone else noticed this? I dont think it should be doing that.

 

[2ManyCars]

Sounds wrong to me...

 

[SharkDiver]

The car was on jack stands?It was not in gear right?If it was in neutral it sounds like maybe your clutch is not disingaging fully.Im no expert tho..

 

[silverspd3]

Ya it was in in neutral on jack stands. If I push in the clutch it stops.

 

[Rotus8]

This is normal. It is drag inside the transmission between the disengaged gears. Not to worry.

 

[tru-boost]

normal.... it should only happen for a minute then the wheels should stop.

 

[SilverWagon]

It happens because the trany fluid is cold and acts liek gear in a way.

 

[silverspd3]

Cool. I was worried for a second. Its not enough to make it creep on the ground or anything but I've never had a rear wheel drive car do this that I can remember. Thanks for the responses.

 

[GoFast]

very normal

 

[tru-boost]

Cool. I was worried for a second. Its not enough to make it creep on the ground or anything but I've never had a rear wheel drive car do this that I can remember. Thanks for the responses.

yeah you wont see it on a rear driver. all that extra drivetrain loss means that little bit of friction never makes it to the wheels. on a FWD car the entire driveline is compact and literally sandwhiched together. a RWD car has to transfer power from the clutch through the transmission, down a long driveshaft, into the differential, down long axles, then finally to the wheels. that long distance causes a lot of the power/momentum to be lost by the time it gets there.

 

[dkswim]

friends srt4 did it all the time i havnt had mine running while on jacks yet

 

[Haltech]

Completely normal. Ive place some of my cars on stands and ran them in gear to polish the alumn on the wheels or attach a brake liner to it to cut the rotors for me. There is no friction when the tires leave the ground, so in neutral, they will spin.

 

[AutoXRacer]

yeah you wont see it on a rear driver. all that extra drivetrain loss means that little bit of friction never makes it to the wheels. on a FWD car the entire driveline is compact and literally sandwhiched together. a RWD car has to transfer power from the clutch through the transmission, down a long driveshaft, into the differential, down long axles, then finally to the wheels. that long distance causes a lot of the power/momentum to be lost by the time it gets there.

Sweet!!! (2thumbs)
Does this mean we have a more efficient drivetrain than RWD? More power transfer to the wheels?

Anyone know the drivetrain loss on our cars? My old Miata was roughly 30HP from the flywheel to the rear wheels.

 

[tru-boost]

Sweet!!! (2thumbs)
Does this mean we have a more efficient drivetrain than RWD? More power transfer to the wheels?

Anyone know the drivetrain loss on our cars? My old Miata was roughly 30HP from the flywheel to the rear wheels.

yes FWD is more efficient. RWD will usually lose 15-18% of its power by the time it reaches the wheels.
FWD is usually 8-12%