Rennteam 2.0 - EN - Forum - Re: Which is best gear again? - Page1

Mar 15, 2005 2:25:39 PM

JasonF: Junior; Loc: New Jersey; Posts: 114, Gallery; Registered on: Oct 13, 2004

Car rolls down driveway, even after left in gear. What gives

I've been driving manual transmissions for 18 years, and have never had this happen. I parked my 997 on my driveway, left it in (third) gear but did not pull the e-brake. After coming back outside I noticed that my car had rolled down the driveway! It's not that steep of a driveway, and thank god no one was hurt.

I always assumed that leaving a car in gear was the preferred method of parking since e-brakes can disengage. Am I wrong? And why would a car left in gear roll backwards down a driveway? The car did not slip out of gear, since it was firmly in third when I went to "rescue" the car.

Any thoughts are welcome!

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Mar 15, 2005 3:16:12 PM

SoCalHoosier: Veteran; Loc: California , United States; Posts: 896, Gallery; Registered on: Jun 13, 2003; Reply to: JasonF

Re: Wow you are lucky.

That is now the second time I have heard of a person leaving a car in gear and having it roll down.
The first time was someone in Hollywood Hills that left it in gear without using the e-brake. They came out to find the car flipped over at the bottom of the hill. Amazingly no one or car was struck by the vehicle!

You should always use both. But if given a choice you should use the e-brake. I think you have the logic in reverse on which can pop out.

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Mar 15, 2005 3:21:47 PM

Carlos from Spain: Rennteam Moderator; Loc: Spain. , Spain; Posts: 21148, Gallery; Registered on: Feb 9, 2003; Reply to: SoCalHoosier

Re: Wow you are lucky.

I always use both. I leave it in gear and before releasing the clutch I pull the e-brake so that the car does not roll its weight onto the transmission loading it. Never had the e-brake disengage and the weather here is not cold enough to freeze the e-brake.

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Mar 15, 2005 3:24:31 PM

MMD: Rennteam VIP; Loc: usa; Posts: 9652, Gallery; Registered on: Dec 16, 2004; Reply to: Carlos from Spain

Re: Wow you are lucky.

FYI: I have heard of 986 and 996 emergency brake levers which will disengage themselves it they get unintentionally tapped or knocked. Check yours to be sure.

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Mar 15, 2005 4:12:23 PM

Trundle_GT3: Veteran; Loc: CA, USA; Posts: 1016, Gallery; Registered on: Jun 30, 2003; Reply to: MMD

Re: Wow you are lucky.

Also the gearshift lever should be placed in 1st or reverse gear!

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Mar 15, 2005 4:21:01 PM

Rossi: Rennteam VIP; Loc: Home , Germany; Posts: 12680, Gallery; Registered on: Apr 11, 2002; Reply to: Trundle_GT3

Re: Wow you are lucky.

Could it be that the gear transmission ratio in 3rd is that high, that it doesn't prevent car from rolling at a certain slope?

(then 1st would be better)

I always engage both, 1st gear as well as e-brake. As Carlos said, if you're not living in Finland or Alaska and park your car outside, there's no problem with engaging the e-brake.

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Mar 15, 2005 4:30:03 PM

Holminator: Veteran; Loc: USA , United States; Posts: 1041, Gallery; Registered on: Sep 28, 2004; Reply to: Trundle_GT3

Re: Wow you are lucky.

I use chocks. Just kidding.

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Mar 15, 2005 4:31:25 PM

Carlos from Spain: Rennteam Moderator; Loc: Spain. , Spain; Posts: 21148, Gallery; Registered on: Feb 9, 2003; Reply to: Rossi

Re: Wow you are lucky.

I agree with Trundle and Rossi, In 1st or reverse, the degree of slack is very small but 3rd gear is so long that it allows a fair amount of roll before the gear catches, maybe the amount you experienced

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Mar 15, 2005 4:33:17 PM

atlas310: Junior; Loc: Los Angeles; Posts: 73, Gallery; Registered on: Jul 29, 2003; Reply to: Carlos from Spain

Re: Wow you are lucky.

I've always left it in first and then cranked the e-brake just out of habit.

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Mar 15, 2005 4:51:47 PM

Holminator: Veteran; Loc: USA , United States; Posts: 1041, Gallery; Registered on: Sep 28, 2004; Reply to: atlas310

Re: Wow you are lucky.

Everybody I know uses either 1st or reverse, but I've never found a need to do it. Emergency brake works just fine and just turn in your wheels toward the curb as a back up measure (streets chocks you might say).

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Mar 15, 2005 5:27:41 PM

MMD: Rennteam VIP; Loc: usa; Posts: 9652, Gallery; Registered on: Dec 16, 2004; Reply to: Holminator

Which is best gear again?

For parking, I think reverse and first would be the worst ones to use.

In low gears the engine crank is easier to rotate. That's why you push-start a car in low gear.

I can imagine an unstarted car's engine happily pumping away more easily in lower gears as it speeds downhill unattended.

Not sure though, need more brainpower of this board.

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Mar 15, 2005 5:42:31 PM

PS CA: Veteran; Loc: California , United States; Posts: 833, Gallery; Registered on: Nov 13, 2003; Reply to: MMD

Re: Which is best gear again?

Quote:
MMD said:
For parking, I think reverse and first would be the worst ones to use.

In low gears the engine crank is easier to rotate. That's why you push-start a car in low gear.

I can imagine an unstarted car's engine happily pumping away more easily in lower gears as it speeds downhill unattended.

Not sure though, need more brainpower of this board.

Here is what the 997 manual has to say about this topic:

"Setting the parking brake
f Pull the lever all the way up (arrow).
With the ignition on, the parking brake warning
lights in the instrument panel and on-board
computer will come on if the lever is even
slightly raised. A firm pull upward is required to
properly engage the parking brake.
If the brake is not fully set, the vehicle may roll
without control.
f Move the gearshift lever to reverse or first
gear.
f Before exiting the vehicle, make sure that the
parking brake is fully set and the vehicle is not
moving at all."

I have always parked in 1st with the parking brake engaged. My son has a new C6 Corvette and you must park it in reverse or the electronics won't turn off.

Phil

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Mar 15, 2005 5:43:19 PM

amazon: Rennteam Pro; Loc: Belgium , Belgium; Posts: 2110, Gallery; Registered on: Jul 5, 2004; Reply to: MMD

Re: Which is best gear again?

The car is just too heavy. I have the same thing on my audi. I called the dealer and asked him about it. There's nothing wrong with the transmission, it's just the weight of the car can't be hold by putting the car in gear.

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Mar 15, 2005 6:19:16 PM

JasonF: Junior; Loc: New Jersey; Posts: 114, Gallery; Registered on: Oct 13, 2004; Reply to: amazon

Re: Which is best gear again?

Original poster here...the reason I put it in third is that my car, like many others' on the board, has a tough time going into first when it's cold outside. So just out of habit, I threw it into third. The difficulty going into first will be addressed at the dealer's at some point in the future...thanks for all the info, first or reverse it is!

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Mar 15, 2005 6:39:07 PM

mcdelaug: Expert; Loc: Fort Worth, Texas , United States; Posts: 1912, Gallery; Registered on: Mar 3, 2004; Reply to: MMD

Re: Which is best gear again?

MMD,

I think that you may have this backwards.

Having the car in the lowest gear will require the largest number of crank rotations per wheel rotation. Hence the engine braking effect of a non-running engine in a rolling car would be highest in the lowest gear.

A low gear is used to push start a car because this generates a sufficient number of crank revolutions at a speed humans can actually push a vehicle. Think of it this way...if you tried to push start a car in 6th, you'd have to run 40mph to achieve enough rpms to actually start the engine. Doing this in first or second gear means you get adequate engine revolutions at 10-15mph, a speed that most humans can actaully run.

mcdelaug

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Mar 15, 2005 7:44:23 PM

Freak 2: Senior; Loc: EUROPE; Posts: 605, Gallery; Registered on: Jan 15, 2005; Reply to: mcdelaug

Re: Which is best gear again?

Quote:
mcdelaug said:
MMD,

I think that you may have this backwards.

Having the car in the lowest gear will require the largest number of crank rotations per wheel rotation. Hence the engine braking effect of a non-running engine in a rolling car would be highest in the lowest gear.

A low gear is used to push start a car because this generates a sufficient number of crank revolutions at a speed humans can actually push a vehicle. Think of it this way...if you tried to push start a car in 6th, you'd have to run 40mph to achieve enough rpms to actually start the engine. Doing this in first or second gear means you get adequate engine revolutions at 10-15mph, a speed that most humans can actaully run.

mcdelaug

AMEN To That !!

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Mar 15, 2005 10:07:17 PM

Grant: Rennteam VIP; Loc: Denver, CO , United States; Posts: 12586, Gallery; Registered on: Aug 21, 2002; Reply to: mcdelaug

Re: Which is best gear again?

The compression of the motor is what keeps a car from rolling. In 3rd, the motor need to "rev" very slowly to be rolling at 5mph and the compression is not sufficient to keep a 3,200# car from rolling with such a tall gear...

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Mar 15, 2005 10:53:42 PM

MMD: Rennteam VIP; Loc: usa; Posts: 9652, Gallery; Registered on: Dec 16, 2004; Reply to: mcdelaug

Re: Which is best gear again?

Quote:
mcdelaug said:
MMD,

I think that you may have this backwards.

yeah, that's right, you guys are correct. First or reverse for parking. Thanks for correcting me.

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Mar 16, 2005 1:09:12 AM

DD694: Co-Pilot; Loc: SoCalifornia, USA; Posts: 281, Gallery; Registered on: Jul 16, 2004; Reply to: mcdelaug

Re: Which is best gear again?

Quote:
mcdelaug said:
MMD,

I think that you may have this backwards.

Having the car in the lowest gear will require the largest number of crank rotations per wheel rotation. Hence the engine braking effect of a non-running engine in a rolling car would be highest in the lowest gear.

A low gear is used to push start a car because this generates a sufficient number of crank revolutions at a speed humans can actually push a vehicle. Think of it this way...if you tried to push start a car in 6th, you'd have to run 40mph to achieve enough rpms to actually start the engine. Doing this in first or second gear means you get adequate engine revolutions at 10-15mph, a speed that most humans can actaully run.

mcdelaug

I agree with your theory, but I am not sure how many folks could actually push a car at 10 - 15 MPH (Equals a 6 minute or 4 minute mile respectively.)

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Mar 16, 2005 2:38:41 AM

ADias: Rennteam Pro; Loc: Southwest USA , United States; Posts: 2495, Gallery; Registered on: Apr 9, 2004; Reply to: DD694

1st gear up, reverse down...

It is 1st or reverse for parking. If the car is parked pointing up, put it in 1st. If the car is pointing down a slope, put it in reverse. And always apply the parking brake if it is not flat. On my flat garage I do not apply the parking brake and always engage 1st gear.

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Mar 16, 2005 11:34:54 AM

Dilinger: Rennteam Pro; Loc: Athens,Greece , Greece; Posts: 2034, Gallery; Registered on: Dec 23, 2004; Reply to: Holminator

Re: Wow you are lucky.

Of course guys!!

Putting in a gear means putting !st gear or Reverse not 3rd, 4th , or 6th,

the point is that the 3rd gear can allow the car to move in higher speed thus giving no advantage.its like having not gear or pressing slightly the break.
In a downhill you must engage reverse to be fully blocked,thus allowing only backwards movements.

or in straight or uphill only 1st, gear.

Try not to mess this up or you might transform you 991 to a cayman after an accident!

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Car rolls down driveway, even after left in gear. What gives

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Which is best gear again?

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Re: Which is best gear again?

Re: Which is best gear again?

1st gear up, reverse down...

Re: Wow you are lucky.

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