Right, like is said I know the answer. "But you never guessed it"... Please don’t quote something I said with words you twisted.
This is why I did not want to answer the post. You obviously know the answer in all of you kernels of infallible wisdom. You shod have answered the question as well instead of playing a quip on my choice of wording. Now you flamed and have dashed this post right into '*****' status and we all are dumber for it. I merely answered the question a simply as I was able to. Hence the 'idiotic' ramblings of my Ego-maniac like post (as some of you have portrayed it). Now, you tell the rest of us why you have a problem with the way I explained this and please add your omnipresent answer to this persons query. I was merely trying to do what you have requested of me.


THE GREAT WIZARD 'TITANIUM SPONSOR' HAS SPOKEN... hahahaha please let’s stay on subject now.

And mods, Please DON'T erase this. It would be a shame to loose such a wonderful conversation.

 

Agreed. But it seems like nobody is willing to take anybody else's word for it. I couldn't find anything on the 'net addressing exactly this question, but there's plenty of information on how engines and cars work out there, you just need to assemble the pieces.

I just hope we don't get a topic started about cross-drilled and/or slotted rotors vs. solid rotors. That should be locked immediately.

 

I agree!

 

Hallelujah.... :oops:

 

For all intents and purposes the key issue is money out of pocket. Now, new brakes are much cheaper than a new clutch or tranny, and it will wear out the clutch and tranny quicker, so, coast and use the brakes, and it will cause you less trouble down the line.

 

I really didn't want to add more fuel to the fire, however...

When you brake with the car in neutral or the clutch in, you're putting more wear on the CV joints than if you leave the car in gear and use the brakes along with engine braking. Porsche has always recommended you shift down through the gearbox coming to a stop in much the same way you go up through the gears when accelerating. It's pretty simple, actually: when you use only the brakes, the engine and transaxle keeps wanting to move forward, putting force on the CVs; when you use engine braking or engine braking and brakes, you're slowing the engine, transaxle and hubs, wheels, etc. all down at the same time.

Coasting in neutral or with the clutch in will offer you the best fuel economy, mainly because you can coast farther from the same starting speed than if you used engine braking. I usually keep the car in gear (many times in 4th or 5th) when coasting to a stop, and only put the clutch in and shift to neutral when the RPM are down to about 1000. This has a small engine braking effect (higher gears=less engine braking) but keeps the driveline loaded for most of the deceleration.

 

We will log the injector pulse width tomorrow morning on the MODIS and post the chart. Hopefully we can settle this issue by sheer science Cost is an issue, just remember that the vehicle application is your choice and can be facilitated on many fronts. That is why we love our job, it has resilience.

 

I can't believe no one has mentioned the job of a flywheel in an internal combustion engine.

The engine only burns fuel in two instances- under acceleration (pushing the gas), and at idle. Otherwise, the momentum of the flywheel (which is on the end of the crankshaft) keeps the engine spinning. Obviously friction (both surface from the tires and internal from the engine) slows it down eventually, but the flywheel (not gasoline) keeps the engine spinning when you downshift or let off the gas.

Many people add lightened flywheels to their car in order to speed accleration, but it comes at the cost of fuel economy. Sure, a lighter flywheel will let the engine spin up slightly faster, but your RPMs will drop rapidly when you let off the gas.

It is also illegal in some areas to cruise down a hill in neutral, for obvious safety reasons.

 

I say you dont use any gas when downshifting to a stop. Lets say you left your car on a hill with ignition off in 1st gear and it started rolling down, if the car is in gear the engine will start to turn, and i highly doubt the car engine is burning any gas.

 

Enough of this ____ing contest already, little boys!

 

uhhhhhhhhhhhh who cares? I doubt it makes that much of a difference

 

this thread sux...

 

No, what sucks is that nobody actually knows the answer...

 

I do.

 

I didn't even bother to read all the post
The truth is

When your foot is off the gas, there are no fuel going through the injector
No matter how high the RPM is, no fuel is no fuel

Just think about it, you are using your engine to brake the car
If it still burn fuel... engine brake does not exist! because your car will simply just go when you down shifting.

Why argue about this? If your car actually go slower when you down shift

 

Those of us who know have been trying to tell those who don't, but they won't listen. They won't listen to you, either. "Don't try to teach a pig to sing; it wastes your time and annoys the pig."

 

BINGO! We have a WINNER! Read this ____, write this ____ down, learn this ____, and drive off happy!

 

You obviously didn't read the rest of the thread. Plenty of people have given the answer and have been ignored.

 

The amount of gas you'll potentiall save will never offset the cost of increased wear on your Transmission... Break Pads are cheap. Gas is Cheap.

Breaking on engine compression ALL THE TIME should be reserved for professionals that rebuild their trannies frequently...

-Think McFly, THINK!

 

this is a really pointless arguement. i dunno the answer to this but why dont u guys back up claims with proof. if you cant then jus stick it to loving you cars and sharing common interest.