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Old 05-15-2006, 05:32 PM   #1
neoncrazy101
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Member#: 113685
Join Date: Apr 2006
Vehicle:
1990 Legacy
blue

Default short shifting?

Hey i've been wondering if short shifting in a mtx hurts the transmission or the engine or any part of the drivetrain?
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Old 05-15-2006, 06:35 PM   #2
sha_zapple
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1998 Legacy L

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the actual short shifter does not hurt anything. However, the way youll want to drive with it installed might
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Old 05-15-2006, 06:40 PM   #3
supermarkus
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SSM

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Short shifting or short shifter? There IS a difference.
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Old 05-15-2006, 06:47 PM   #4
MCarp22
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Deep Cherry

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Excessively short shifting, say, at 2000rpm, while running the motor at full throttle, can put a lot of load on the connecting rod bearings.
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Old 05-15-2006, 07:36 PM   #5
Patrick Olsen
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QuickSilver Metallic

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If you're short shifting and putting a lot of load on the engine, then yes, you can damage the engine in the long run. It's called "lugging" the engine, and it's not a good thing to do. Think of riding a 10-speed bike - what puts more load on your legs (aka your connecting rods), starting from a slow roll in 10th gear or in 1st gear?

If you're short shifting and using gentle throttle application (to just ease your way up to speed) then it shouldn't damage anything. It's not going to gain you anything either, though, as it's an inefficient way to drive.

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 05-15-2006, 10:40 PM   #6
Wiscon_Mark
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1995 Legacy OB 5MT
2003 Forester X 5MT

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2000 rpms is lugging?

Not on my car.

below 1500 is though.
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Old 05-15-2006, 10:45 PM   #7
Patrick Olsen
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QuickSilver Metallic

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Well, if you shift at 2000rpm, your RPMs in the next gear are going to be under 1500rpm (except on the 3-4 shift, in which case you'd be right at 1500rpm).

And again, lugging isn't just driving at low RPM, it's putting a large load on the engine at low RPM. Cruising along at 1500rpm may be fine, but I certainly wouldn't go WOT at 1500rpm - I'd downshift instead.

Pat
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Old 05-15-2006, 11:00 PM   #8
Wiscon_Mark
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oh, gotcha

With my 3.9 FD, I find that I might just lug it a tad, keeping every shift under 2000...1->2 and 4->5.
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Old 05-15-2006, 11:04 PM   #9
neoncrazy101
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ok good yea cause i was doing this MPG test with my Neon to see which way would give me better gas milage and i found out today that i lost 5MPG by shifting at 2k-2.3k. so its back to shifting between 2.5k-3k.. the reason why i didn't do this in my Legacy is because its an automatic and has some problems that needs attending 2.
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Old 05-16-2006, 10:07 PM   #10
NiTRoN
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over 250,000 Miles

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I drive AT Legacy and I tell it when to shift.. Usually you can train uself on AT cars so the trany switches when you want it to... I've gotten really good at that and usually 2500 and hardly over 3000 is optimal place to shift.
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