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Old 10-22-2013, 06:57 AM   #1 (permalink)
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Default 2014 6 Speed Owners: 4th Gear Stick Vibration?

Hi There

I have a light vibration at the stick in 4th gear. It is obvious when accelerating from around 25mph and above. It seems to be more noticeable at full or near full throttle.

I know not to rest my hand on the gear box and I'm not asking anyone else to do so. Just lightly touch the shifter *during acceleration*, while in 4th and let me know if you get vibration.

I've taken the car to the dealership, they told me its normal due to engine vibration. This is my 3rd vehicle with a manual transmission and I've never experienced this before. I'd love to have this confirmed.

Thanks
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Old 10-22-2013, 07:14 AM   #2 (permalink)
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RiffleKing........ Mine does the same thing only in 4th gear. It might be the linkage and gear shift leaver are in a position that sets up a vibration only in 4th. It reminds me when I'm on the x-way that I need to shift back up to 6th.
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Old 10-22-2013, 07:17 AM   #3 (permalink)
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If you are in 4th gear @25 MPH, that is a problem. That probably lugs the engine and creates a bunch more shaking. The 6 speed you have has even higher gear ratios than the 5 speed, and I know that my 400lb lighter (with similar power) and lower gear ratio 5 speed Forester would struggle in 4th gear @25 MPH.
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Old 10-22-2013, 07:34 AM   #4 (permalink)
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Brutus,

Thanks a bunch for the feedback. I'll stop worrying about it now and just consider it a courtesy vibration! :)

Loscaldazar,

I do not normally shift that early. It was for test purposes before bringing it in to get looked at.
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Old 10-22-2013, 07:40 AM   #5 (permalink)
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Probably that the vibrations of fourth gear are in resonance with the shifter components. It's something that should've been caught in development, but is not a problem.
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Old 12-22-2013, 04:10 AM   #6 (permalink)
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Default 2.5 ^mt not a flexible combination.

Quote:
Originally Posted by Loscaldazar View Post
If you are in 4th gear @25 MPH, that is a problem. That probably lugs the engine and creates a bunch more shaking. The 6 speed you have has even higher gear ratios than the 5 speed, and I know that my 400lb lighter (with similar power) and lower gear ratio 5 speed Forester would struggle in 4th gear @25 MPH.
I drive a lot of MT's

I am spoiled by the good ones. The 2.5L and 6MT has some vibtration, weak torque output at low revs and a bit of surging.

Ration spacing is wrong 1-2 and 5-6.

Compare to a almost any Mazda and you will hate the subie MT.
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Old 12-23-2013, 04:51 PM   #7 (permalink)
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I also have a 6 sp manual 2014 forester and I was getting pretty anxious about the vibration in 4th gear. I notice it around 2500 rpm. I've driven stick for about 40 years (never a 6 spd) and I don't recall anything similar. I also feel a slight vibration in the clutch pedal. Has anyone noticed that? I wonder if I'm overly sensitive and if a mechanic would even feel what I do
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Old 03-07-2014, 12:35 PM   #8 (permalink)
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This is because 4th gear is a direct 1:1 so it simply engages the input shaft to the output shaft with no gear reduction or addition. Basically the counter shaft is in mesh with but not engaging the output shaft so there is less absorption of the engine vibration.

Doug
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Old 03-07-2014, 11:12 PM   #9 (permalink)
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^ wrong. All gears are indirect in the 6MT.
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Old 03-08-2014, 04:41 AM   #10 (permalink)
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true that...also what are these people doing in fourth at 25 mph???...you will not get better MPGs shifting that far below the torque band; all you are doing is beating your engine by lugging it. the barest minimum speed in fourth on that engine is about 30 mph, and any acceleration would require a shift to third
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Old 03-08-2014, 09:40 AM   #11 (permalink)
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I stand corrected. I didn't realize they used all indirect gearboxes but sure enough 4th gear is .972
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Old 03-08-2014, 11:00 AM   #12 (permalink)
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No driveline vibration in my 2014. Your engine speed is way too low in 4th gear at 25 mph though.

Try and keep RPMs above 2,000 in any gear above 1st.
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Old 03-08-2014, 07:28 PM   #13 (permalink)
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I brought this up the the dealership mechanics during first (free) oil change and was told it was the nature of the beast. I once had a vehicle with a bad shifter fork out of the factory that would pop out of gear during engine braking. This seems innocuclous but annoying.

If you move the shifter very slightly, the vibrations will disappear. It appears it's a case of the cable transferring vibrations to the shifter. This is my first cable shifter, so I'm not sure how the shift lever is located (detents or whatever). Possibly a wee bit sloppy in shift lever detents?

Looking at the cable, it drapes over the top of the tranny, then makes a loop where it contacts the engine block, finally going down to the passenger side of the tranny where it attaches to the tranny. It also could be that some additional brackets or padding might isolate the vibrations. Currently, it kinda looks like the only actual attachmets are at the shifter and where the cable mates with the transmission.
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Old 03-08-2014, 11:33 PM   #14 (permalink)
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the detents are at the bellcranks at the rear of the 'box, and the shift rails. The lever has no positioning of it's own save for the reverse collar.
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Old 03-09-2014, 04:48 PM   #15 (permalink)
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btw, 13+k miles on mine and no vibration in any gear/speed
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