S2KSpaYellow

OK, I am not an expert but I believe coasting will damage the transmission. The only way fluid circulates is from the counter shaft rotating in the fluid and carrying it up to the main shaft. If the car is in neutral the counter shaft will not turn. The fluid will settle to the bottom of the transmission. Now you are going 50-70 MPH with the main shaft spinning like hell and no fluid being circulated. This has to cause damage to the bearings and other trans parts.

I also read an article on a bonneville salt flat run where to guy accidently took the car out of gear when slowing from the high end. He then put it back in gear to avoid trans damage. I don't know if it has any relation but there must be something to it.

xviper

The S2000 tranny has a low pressure fluid pump. Spinning, even at idle, would still work the pump. That Bonneville car may not have had a pump in the tranny.

Nevertheless, are you sure the counter shaft won't turn? (I'm asking because I'm not sure and because I'm being a smartass.) I thought that in neutral, clutch out, the engine spins all parts of the tranny except the output shaft and as long as the car is moving the rear wheels drives that.

xman03

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BryanH

I'm curious, because I've never heard that the injectors shut off when you drive in gear with the throttle closed down a hill. With no fuel, what keeps the engine running? Surely the ignition shuts down as well. Does the engine just operate as an air pump of sorts, letting fresh air in and out with no combustion?

Edit - I have noticed also, that with some cars (including my friend's S with HKS exhaust) the exhaust noise is loudest when you are in gear and off the gas.

S2KSpaYellow

I should have specified clutch in. With the clutch release the input shaft will turn and thus turn the counter shaft.

SenderGreen

On page 17-18 in my helms it says you can get an EPS DTC when the engine speed is 500 RPM or less and the vehicle is traveling at a speed of 6.2 mph (10km) or more for about 3 min. That would be pretty unlikely as 3 min seems like a while.

RACER

I do this sometimes.

RACER

The input shaft is splined to the clutch disk. Dis-engage the clutch, the clutch disk may spin less.

Wisconsin S2k

I was under the impression the counter shaft would spin no matter what, since it's mated to the propellor shaft and rear wheels. isn't the counter shaft where the VSS gets its reading? I mean after all, I dont suddenly take the car into neutral and let out the clutch, and the speedo drops to 0.

xviper

[QUOTE=BryanH,Apr 1 2006, 12:22 AM] I'm curious, because I've never heard that the injectors shut off when you drive in gear with the throttle closed down a hill.