Hypermiling tech that damages car parts

[RedDevil]

There is no such thing as rev matching a bump start... just select top gear and the quick hard-release & butter feed the clutch pedal.
The hard release kicks the engine alive, then before it revs right up you got to release the clutch enough to make the further revving up go smooth.

It is a skill I was proud of having mastered, but now I get no chances anymore to keep honing it. One of the drawbacks of trading in a manual for an automatic

[jedi_sol]

Originally Posted by RedDevil

There is no such thing as rev matching a bump start... just select top gear and the quick hard-release & butter feed the clutch pedal.
The hard release kicks the engine alive, then before it revs right up you got to release the clutch enough to make the further revving up go smooth.

It is a skill I was proud of having mastered, but now I get no chances anymore to keep honing it. One of the drawbacks of trading in a manual for an automatic

Wait, doesn't "buttering" the clutch to re-engage wear the clutch out faster?

I always rev match after bump start.

Just BARELY release clutch, engine fires on
Clutch in so that the car does not jerk
Shift to top gear
Blip the throttle to rev match
Release clutch...if I did it right, the car does not jerk....thus no wear on the clutch

[jedi_sol]

[QUOTE=Xist;443156
Jedi Sol, those are excellent articles, very well-written and informative. The author seems like an all-around great guy! However, I believe that Theaveng asked about rev-matching, instead of allowing the clutch to do it, and I must have missed that part of those articles.

I am pretty sure that I do not rev-match. Where is my cone of shame?[/QUOTE]

I dunno what's going on, I came into this thread too late.

I thought the debate was
-op feels Eoc not worth it due to accelerated clutc check wear
-however, if you Rev match, it saves clutch wear
-op asked if Rev match uses more fuel vs dragging clutch up to speed and asked for tests done by users

Therefore I posted metro mpg blogs about pulse and glide vs eoc...to show that eoc saves way more gas

[Baltothewolf]

All this debating is fun to read. Not to mention I have learned a lot about rev matching and proper bump starting. I do have a question though, in the time it takes to bump start, push in clutch rev match then release clutch, wouldn't you lose as much speed as just letting the engine drag up to speed then push the throttle? Or am I not understanding this whole rev match thing properly.

[Cobb]

Rev match, blah, hahahahahahaha. Ive never done that in any vehicles Ive owned unless the clutch cable was busted. Then Id start in gear and feel my way to the next gear.

For down shifting I just work the clutch and brake, dumping the clutch as the engine idles and watch it fly up to 3, 4, 5 grand as I work my way to a stop.

Clutches are designed to wear and be replaced, like brakes.

[RedDevil]

Originally Posted by jedi_sol

Wait, doesn't "buttering" the clutch to re-engage wear the clutch out faster?

I always rev match after bump start.

Just BARELY release clutch, engine fires on
Clutch in so that the car does not jerk
Shift to top gear
Blip the throttle to rev match
Release clutch...if I did it right, the car does not jerk....thus no wear on the clutch

Depends on target RPM of course, but true I did also use the accelerator unless when coming to a stop (the Almera had the nasty habit of always taking at least a second or 2 before firing up, so I kept it running at the lights if someone was behind me... making me bump start it on the approach)

But I always bump start it in 5th, giving it a sharp short release rather than a faint one. You don't want to barely drag the engine through the first compression stroke; that just adds extra wear.
In 5th gear it did not jerk much even on the Almeras soft motor mounts.

[cowmeat]

I always rev match after bump start.

Just BARELY release clutch, engine fires on
Clutch in so that the car does not jerk
Shift to top gear
Blip the throttle to rev match
Release clutch...if I did it right, the car does not jerk....thus no wear on the clutch

Lol, that's written exactly as I would have written it!

I bump start all the way down to like 5 mph in fifth gear by barely releasing the clutch, then shifting immediately into the appropriate gear with the revs matching. You can't even tell I'm doing it at this point, and I don't even have to think about what I'm doing, it just comes naturally now

[serialk11r]

Originally Posted by Cobb

Rev match, blah, hahahahahahaha. Ive never done that in any vehicles Ive owned unless the clutch cable was busted. Then Id start in gear and feel my way to the next gear.

For down shifting I just work the clutch and brake, dumping the clutch as the engine idles and watch it fly up to 3, 4, 5 grand as I work my way to a stop.

Clutches are designed to wear and be replaced, like brakes.

The wear is not so bad but remember the drive efficiency from wheels to engine here is under 50% (50% at the clutch because it's slipping, plus transmission losses). I'm pretty sure you'd save more fuel if you used the gas pedal to rev the engine up.

Plus, the jolt is probably bad for the transmission.

[Baltothewolf]

Personally, how I bump start is, I put it in 5th and quickly release the clutch. I know exactly how much release will start the engine so I only release the proper pressure then instantly thrust the clutch back in and then release clutch and press throttle. I maybe lose 2-3mph and it's not a rough transition at all. When my uncle was riding with me he didn't even know I was EOCing until I told him.

[Xist]

Originally Posted by Cobb

Rev match, blah, hahahahahahaha. Ive never done that in any vehicles Ive owned unless the clutch cable was busted. Then Id start in gear and feel my way to the next gear.

For down shifting I just work the clutch and brake, dumping the clutch as the engine idles and watch it fly up to 3, 4, 5 grand as I work my way to a stop.

Clutches are designed to wear and be replaced, like brakes.

Cars are designed to wear and be replaced, too. Hey, even girlfriends and wives wear and need replacing!

I think the difference between cars and women is that cars wear out slower if you drive different ones, while relationships wear out faster when you try to have simultaneous ones.