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Discussion Starter · #1 ·
I'm currently running a Koup SX 6 speed and here is my problem. Whenever I do a 3 - 6 shift my transmission grinds, in fact, if I do a 4 - 6 shift, my transmission grinds. So I'm wondering, am I not supposed to be shifting from third to sixth (say accelerating onto the highway then shifting into 6th to cruise)? I was always under the impression that this was okay. Does anybody else's transmission grind when doing this or should I get it checked by the dealer?
 

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When shifting you are supposed to be in the correct gear that applies to the current situation. If you begin going down a hill in 1st gear and the momentum is picking up quickly and now you need to be in 4th gear then that is correct [you can shift from 1st to 4th]. It sounds to me that you might not be in the right gear at the given situation - hence the grinding. How long have you been driving stick shift?
 

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This is inaccurate - you should be in the correct gear that the situation calls for.
Agreed. Besides, assuming you are somewhere even remotely close to an appropriate gear for the given speed, I can't imagine it should be grinding between 4th and 6th. Perhaps your clutch/clutch pedal is out of adjustment, or you're not depressing the clutch pedal all the way?
 

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I do non-sequential shiffting everyday and no-grinding!!! take it to the dealer!
 

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When I first got mine id grind a little when shifting. I think it was because the shifters in these cars are clunky/heavy compared to any other car I've driven before. After I got used to it I have no problems.
 

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It sounds like there is a clutch issue.
Regardless of what gear you are in or shifting to....the tranny is not suppose to grind.

Either have the dealership test drive or a friend.....just to make sure that it is either a tranny problem or a driving problem.

This is the first time I am hearing of a tranny problem.

Please keep us posted.

Good Luck.
 

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Not the first time I am hearing about a tranny problem... we've replaced three of them, now.

Do you have cold weather mats in your car? possibly jammed up behind the pedal and not allowing it to fully depress? Are you short and maybe not bottoming out the pedal? Simple questions, but it's amazing how many times someone thinks they have pushed all the way and there is an inch of room left.
 

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Discussion Starter · #11 ·
I've been able to replicate the problem without fail every time since I noticed the problem. I am 6' tall and no winter mats, so its not that I'm not depressing the clutch all the way. I will give you exactly what I do when I face this grinding issue.

- Approach highway entrance, downshift into 2nd gear and take turn at roughly 15 - 20 mph.
- Begin acceleration in 2nd and shift to 3rd
- After I get to ~ 55 - 65 mph (roughly 4,000 - 4,200 rpm) I depress the clutch ALL THE WAY to the floor, I've even held it on the floor for a good 3 - 5 seconds to make sure that the clutch has fully disengaged.
- Pull shift knob out of 3rd (or 4th depending on where I was) and put it into 6th, at that time I hear grinding.

I'm 21 years old and have been driving manual on and off for the duration of my driving experience.
 

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I'm starting to see a bit of trouble developing with these 6-speed transmissions as well. I'm not a tech., but have read enough complaints to see that there's a pattern here. Mine, for example, doesn't seem to sync properly between 1-2, 2-3, or 3-4 until it warms up completely (shouldn't be happening at all, let alone at 4,000 mi.)
 

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I'm starting to see a bit of trouble developing with these 6-speed transmissions as well. I'm not a tech., but have read enough complaints to see that there's a pattern here. Mine, for example, doesn't seem to sync properly between 1-2, 2-3, or 3-4 until it warms up completely (shouldn't be happening at all, let alone at 4,000 mi.)

Yeah I have noticed when cold my car almost refuses to shift from 1-2.. I have to shift very slow and there is very little to no sync in the morning I have to hold the clutch and wait for serval seconds and even then its tough to get into 2nd...
I agree this should not be happening at all..
and for the guys grinding I'd say there is a big clutch/ transaxle issue there
sorry your having such bad trouble.

Once warm seems fine :) but I'm not happy about the poor shifting since that kind of trouble was exactley what I had with my old dsm (eclipse car)
I was hopefully this car would not have this type of issue and is why I traded my car :(
 

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Not the first time I am hearing about a tranny problem... we've replaced three of them, now.

Do you have cold weather mats in your car? possibly jammed up behind the pedal and not allowing it to fully depress? Are you short and maybe not bottoming out the pedal? Simple questions, but it's amazing how many times someone thinks they have pushed all the way and there is an inch of room left.
this is strange because I can shift without any grinding after pushing the pedal down only about an inch, with still a few inches left to the floor
maybe its something aided by my removal of the cdv...
regardless, sounds like an issue with 6th gear or the clutch
idf it does it 5th to 6th also, or if he never goes 5th to 6th, only using 6th on highways and only right after getting up to speed in 3rd or 4th, then it could be the gear
if it doesnt do it 5th to 6th then idk maybe the clutch? or driver error.
driver error doesnt reflect badly on the driver in some situations though, could just be a weird thing with the clutch or something.
 

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Discussion Starter · #15 ·
I do not have any grinding issues going from 5th to 6th, however I can't find anything at all that I could be doing wrong?
 

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Yeah I have noticed when cold my car almost refuses to shift from 1-2.. I have to shift very slow and there is very little to no sync in the morning I have to hold the clutch and wait for serval seconds and even then its tough to get into 2nd...
I agree this should not be happening at all..
and for the guys grinding I'd say there is a big clutch/ transaxle issue there
sorry your having such bad trouble.

Once warm seems fine :) but I'm not happy about the poor shifting since that kind of trouble was exactley what I had with my old dsm (eclipse car)
I was hopefully this car would not have this type of issue and is why I traded my car :(

Hey Rainy, define 'cold' for me. I've noticed my car has similar problems when it's been a bit chilly the night before. I define chilly as around 30 F. It's staying pretty warm in GA this fall so far so I'm just curious as to what temps your looking at.
 

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Are you shifting quickly to 6th from 4th? Maybe not giving the tranny/engine enough time to sync up? Shifting between three gears needs to give time for the high engine rpm to match the low rpm of 6th gear at that moment.
 

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Discussion Starter · #18 ·
Are you shifting quickly to 6th from 4th? Maybe not giving the tranny/engine enough time to sync up? Shifting between three gears needs to give time for the high engine rpm to match the low rpm of 6th gear at that moment.
That was one of my thoughts, however I gave the engine sufficient time to decline to 2,000 rpm before engaging 6th gear (2,000 rpm in 6th is roughly 60 mph based on my observations). Even after the engine hit 2,000 rpm I still had grinding issues.
 

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Just wondering if you have tried double clutching to see if that helps?

It's not supposed to be necessary on a modern car, but it certainly wouldn't hurt.
 
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