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03-05-2008, 12:19 PM | #1 |
Scooby Newbie
Member#: 172732
Join Date: Feb 2008
Location: Nova Scotia, Canada
Vehicle:2006 Impreza N/A Silver |
Is Bump starting an AWD bad..?
This is my first AWD so I'd like to be sure if bump starting is safe.
Towing an AWD vehicle, with say the front wheels in the air, will mean a 100% speed difference between the axles. Say goodbye to your center diff. Bump start: Pushing the car, setting the key to on, and slowly releasing the clutch in second gear will start the engine. All axles and drivetrain are at the same speed.
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03-05-2008, 03:01 PM | #2 |
Scooby Newbie
Member#: 40674
Join Date: Jul 2003
Chapter/Region:
SCIC
Location: Los Angeles
Vehicle:94 Impreza wagon 1.8L + 657cc's |
I don't see why there would be any problem, although I've never been able to bump start my impreza. Even going ~15 mph and using 2nd gear, it won't start.
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03-05-2008, 03:29 PM | #3 |
Scooby Specialist
Member#: 145883
Join Date: Apr 2007
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Vehicle:2008 wrx psm |
if all wheels are rolling then your fine.
but ouch that hurts doing that. |
03-05-2008, 06:43 PM | #4 |
Scooby Specialist
Member#: 165749
Join Date: Dec 2007
Location: Detroit, MF'er!
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why 2nd gear? wont the lowest gear (1st) give the most engine rotation per wheel rotation? i.e - lower wheel speed required and more mechanical advantage to spin the crank.
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03-05-2008, 08:01 PM | #5 |
Scooby Newbie
Member#: 172732
Join Date: Feb 2008
Location: Nova Scotia, Canada
Vehicle:2006 Impreza N/A Silver |
1st is too rough on the drivetrain. I would generally try it rolling downhill with the electric power on, clutch pedal down and 2nd selected.. when going fast enough for 2nd let the clutch up quickly... be ready to give it gas and if needed you can also drop the clutch again again as soon as it fires.
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03-05-2008, 08:27 PM | #6 |
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03-05-2008, 08:45 PM | #7 |
Scooby Newbie
Member#: 59980
Join Date: Apr 2004
Location: California
Vehicle:03 Forester |
I once had a tiny car with a bad starter solenoid. Before I fixed it, the easiest way to start it was, sitting in the drivers seat, put it in reverse, depress clutch with right foot, put left foot on the ground to push the car back a little, then pop the clutch. The last time I ever did that, it started fine, but just sat there with the engine running, in gear and not moving: Busted axle.
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03-05-2008, 08:49 PM | #8 |
Scooby Guru
Member#: 64673
Join Date: Jun 2004
Chapter/Region:
NWIC
Location: portland
Vehicle:1990 Legacy wagon goes 12.387 @ 116.5 |
I bump start mine daily, cause it dies coming out of gear. haha. but yeah, I will sometimes bump start mine 10 times a day. I don't like it though, its just a fact of highly modified life.
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03-05-2008, 10:05 PM | #9 |
Scooby Specialist
Member#: 165749
Join Date: Dec 2007
Location: Detroit, MF'er!
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i have never heard of highly modified cars not running out of gear. what mods do you have?
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03-05-2008, 10:15 PM | #10 |
Scooby Guru
Member#: 64673
Join Date: Jun 2004
Chapter/Region:
NWIC
Location: portland
Vehicle:1990 Legacy wagon goes 12.387 @ 116.5 |
It dies when I take it out of gear (sometimes) and then coast. Like to a stop.
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03-05-2008, 10:25 PM | #11 |
Scooby Newbie
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Location: Albany NY
Vehicle:1998 MiatA! BLACK |
I had a old 95 nissian altima, the starter went, didnt want to spend the money to fix it because i was get rid of it soon. anyways i had no issues with bump starting it, minus the pain in the ass if i had to go somewhere and it was all flat. but lucky me, my driveway is a hill. parked it at the top every night, next morning bumb started it down the hill. and drove to work, park in on the hill (far from my job, but it made it easy to get it going when i left) did it every day for a month had no issues.
It was fun when i had anyone with me, "why do you park up here?" oh... you'll see!!!! |
03-05-2008, 11:31 PM | #12 |
Scooby Specialist
Member#: 74907
Join Date: Nov 2004
Chapter/Region:
NWIC
Location: salem, OR
Vehicle:98 cam'd EJ251 Wrx Tranny,slowr than ish |
The easiest way to do that is to use 3rd gear. You have to selcet a gear that gives the engine more leverage over the car's weight. Think of it from the engine's point of view, would it be easier to use 3rd or 4th gear(fewer engine rpm's in relation to the axles rpm's) Or using a gear where the engine has to turn many rpm's to turn the axle few rpm's.
~Josh~ |
03-06-2008, 01:26 AM | #13 |
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03-06-2008, 08:46 PM | #14 | |
Scooby Specialist
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Location: Detroit, MF'er!
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Quote:
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03-06-2008, 11:23 PM | #15 |
Scooby Specialist
Member#: 74907
Join Date: Nov 2004
Chapter/Region:
NWIC
Location: salem, OR
Vehicle:98 cam'd EJ251 Wrx Tranny,slowr than ish |
When you turn your car on the starter doesnt exactly spin the motor at a very high rpm either. It's probably about or under 100 rpms. I guess I didnt type it the way I was thinking it. I should have said you have to select a gear that uses the car's weight to an advantage. You can try using 2nd gear, but I have found it easier to use 3rd.
~Josh~ |
03-07-2008, 12:48 AM | #16 | |
Scooby Newbie
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Vehicle:2005 '05 2.5RS 5MT '10 Forester X Limited |
Quote:
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03-07-2008, 01:05 AM | #17 |
Scooby Newbie
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Vehicle:2009 Forester XT |
I'm under the impression it is bad for cats.
Correct me if I'm wrong. |
03-07-2008, 01:35 AM | #18 |
Scooby Newbie
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Location: California
Vehicle:03 Forester |
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05-27-2016, 10:15 AM | #19 |
Scooby Newbie
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Vehicle:2015 WRX 6MT Premium CWP |
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05-27-2016, 03:34 PM | #20 |
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Vehicle:1997 Legacy 2.5GT 1996 Impreza coupe |
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05-29-2016, 01:10 AM | #21 |
Scooby Newbie
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Vehicle:98 My FMIC Is bigger than yours. |
lol
I always use 5th gear, it gets the engine spinning plenty fast and there isn't much shock. |
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