[QUOTE=RED MX5,Apr 10 2008, 12:18 PM] But really, you don't need to understand the physics involved to understand that rubbing a paper clip on a piced of paper and rubbing an eraser on a piece of paper yields different wear rates.

 

because the engine and tranny is spinning at the same speed, or spinning at the rpm the engine would be at in that gear the synchro will have to do little to no work depending on how close u get it.

 

red mx5... you must be a fast typer. thats longer than some papers ive written for school haha.

Regarding clutch wear... i think the bottom line is... yes it wears because odds are your blip rev match is off by 50,100, or even a few hundred rpm. no one is perfect every time.

so to compare the wear... this is a guess.... but id equate the force the clutch is holding during engine braking to be somewhere around ~15 hp or so. its somewhere in that ball park for sure, so if you rev match and you're off by 300rpm, your clutch is wearing based ~15hp with a 300rpm differential.

Now, simply starting your car from a stop at partial throttle would be wearing the clutch based on ~150hp with a 1500 rpm differential

Now for autocross... ive launched at 7k, going to full throttle as the clutch comes out. thats clutch wear based on 240hp with a 7000 rpm differential
^with that last one, no my clutch was not relieved by immediate wheel spin making me go to partial throttle. my rcomps usually hook up with a bit of bog (down to about 6000). so its all the clutch

in my opinion, thats like comparing the wear of dragging putting your hand on a belt sander vs rubbing your hands to keep them warm in the cold.

as previously stated... its minute.

 

his theory is... the syncro sees road speed vs the speed of the clutchdisk and tranny input shaft. putting the clutch and rev matching to change the engine/flywheel speed will not affect the cluch disk with the clutch pedal in, there for not changing the speed differential the syncro sees.

 

Excellent analogy.

 

[QUOTE=Neutered Sputniks,Apr 10 2008, 03:44 PM]Does what I'm asking make sense?

 

Sorry for the long posts guys, but thanks to those of you who are starting to get a grip on this and throwing in some intelligent insight.

I am sorry I've gotten uptight with some of the people who so obviously aren't paying attention, but I think most of you can understand.
LOL, at least I hope so.

 

[QUOTE=Ruprecht,Apr 10 2008, 03:53 PM]I understand your point here and would add there is another variable in the mix.

To make the paper clip perform to the specs of the pencil eraser, a much greater down force will be needed.

Let's say 2 pounds of vertical downforce is applied on a pencil against a table top and will cause the pencil to stop moving in 3 seconds when the pencil is driven by a horizontal force of 3 pounds.

 

A quick footnote: "Rev matching" is really the process of matching the flywheel speed to the clutch disk speed, as accurately as possible. When upshifting, we get a match with our shift timing, and when downshifting we get a match by goosing the throttle. Either way, the idea is that you will unbalance (or jerk) the car less if you get a good match.

 

But if I'm cruising at 35mph, shouldn't the dogs/synchros for 3rd be just as effective at spinning up to the appropriate speed without me gating 4th and 5th? Wouldn't I be causing undue wear on the 4/5 synchros/dogs?