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04-12-2018, 11:11 AM | #1 |
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How much damage can one bad shift do to the tranny?
So total newb question but I made a bad shift yesterday in my 2017 WRX.
I've made previous post of bad downshifting and potential tranny damage but that was with the 4th and 3rd gear, so this may seem similar. BUT it seems like the shift into the large 1st gear produced a MUCH harsher jerk. I was coasting in 2nd coming to a red light and shifted into neutral expecting to come to a stop. The light turned green way before I came to a stop and without much thinking I just shifted into 1st BUT my rpms were totally not enough for the speed when I let off the clutch. When I released the clutch I could feel the tranny slam and the car jerked into first, it was a horrible feeling. Any idea what kind of damage a singular bad shift can cause? I have no idea how durable the 2017 WRX transmission is but I have read that earlier WRX trannys were super fragile. The speed was only around 20 mph but the slamming jerk in my car was pretty bad. Ugh, I feel terrible.
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Last edited by Stickyrez; 04-12-2018 at 11:34 AM. |
04-12-2018, 11:38 AM | #2 |
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I will tell you something, these Subaru transmissions are bulletproof. I do a lot of street racing in my Subies. This one time I was going to church, and racing my brother on the way. I was doing 80 mph and down shifted into 2nd(accident). The entire car halted, the tires squealed (my brother said my car was on two wheels). No joke, I literally felt the transmission hit the bottom of the car. After sitting on the side of the interstate, for a few minutes and calming down. I fired her back up and she went straight into gear. That same five speed has never had problem since then. Don't worry about it, just don't mess up too often and you should be good.
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04-12-2018, 11:54 AM | #3 | |
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04-12-2018, 12:02 PM | #4 |
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Assuming I understand what you did correctly, it sounds like you basically shifted from 2nd to 1st and instead of rev matching it you let the clutch out fast and it jerked because you slipped the clutch really abruptly?
Assuming that's the case, I agree with the previous poster that you likely didn't do any meaningful damage to the transmission. They are quite strong as far as I've seen although I'm certainly not a mechanic. The clutch may have experienced a teeny bit of wear from being slipped like that but again; doing that once is not likely to have cause much if any real damage. |
04-12-2018, 12:21 PM | #5 |
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For one thing, 20mph is WAY too fast to even think about going into 1st. I'd just stay in 2nd at anything over a few miles per hour.
2nd, bad downshifts are more risky for the engine than the trans. Launching is hard on the trans. Your fine, don't worry about it, just don't go into 1st unless you are almost stopped |
04-12-2018, 12:46 PM | #6 | ||
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What kind of wear does that introduce into the engine if not the tranny? |
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04-12-2018, 01:53 PM | #7 | |
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People blow engines when they are driving like maniacs on the highway doing 120, hitting redline in 5th and shifting for 6th, but screw up and accidentally throw it in 4th. And since they were at redline in 5th that means they will instantly shoot 1000 rpm's past redline. So bad downshifts don't introduce wear, it just makes it possible to blow right past a rev limiter that can't stop a downshift rev. |
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04-12-2018, 05:57 PM | #8 | |
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04-12-2018, 06:29 PM | #9 |
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04-12-2018, 06:34 PM | #10 |
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04-12-2018, 07:14 PM | #11 |
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How are you coming to that conclusion? The OP isn't bemoaning how quickly he released the clutch. His concern has been focused solely on the fact that he was already going 20 mph when he downshifted into 1st gear. If he instead had some control of the clutch pedal (instead of just dropping it), he would've started to have felt the car slowing down far too quickly. It would've then been a simple matter of stepping the clutch back in before any violent lurch.
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04-12-2018, 07:33 PM | #12 | |
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04-12-2018, 07:45 PM | #13 | |
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04-12-2018, 07:52 PM | #14 |
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"Didn't mean to" what?
Are you saying you normally release the clutch pedal gently (more so while downshifting), hesitating for a millisecond (to see how the car is responding) before full release? Sorry, I don't believe you... not one little bit. [EDIT] You edited your post while I was responding, but my comments still stand. . Last edited by Vancouver98STi; 04-12-2018 at 07:59 PM. |
04-12-2018, 07:57 PM | #15 | |
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04-12-2018, 08:06 PM | #16 |
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04-12-2018, 08:07 PM | #17 |
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04-12-2018, 08:11 PM | #18 |
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04-12-2018, 08:11 PM | #19 |
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04-12-2018, 08:17 PM | #20 |
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04-12-2018, 08:18 PM | #21 |
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04-13-2018, 12:58 AM | #22 |
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@Stickyrez don't let the grumpy types get to you. Everyone makes mistakes just like you did and some people just feel the need to be mean and there's a lot of them on this forum sadly. -shrug-
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04-13-2018, 01:21 AM | #23 | |
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What, you think this is the first time that Mario Andretti here has had issues shifting... and posting about it? We all went for a ride down this same bumpy road back in December. Here's the advice I offered him back then...
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Here, have a look at the whole thread... Bad downshift into 3rd from 4th I'm not being "grumpy". Think of it more as an application of tough love. |
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04-13-2018, 04:21 AM | #24 | |
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I learned manual a little over 8 months ago. I had one bad shift recently that I explained in the OP and you jump all over it like it's the most exciting thing you've got going in your life, lol jesus. I got the answer I wanted and then you needed to jump in and make this thread about yourself. I continued to be cordial even though you were making an ass of yourself and you keep on going. And now you're digging up four month old threads to try to prove you're not acting like a total db. Seriously you need to examine your own behavior here, you're literally a forum nazi with nothing better to do it seems. I'm glad you've become a perfect master of shifting (lol) over twenty years on your old car, but relax. You need a life beyond this forum. Last edited by Stickyrez; 04-13-2018 at 04:50 AM. |
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04-13-2018, 06:43 AM | #25 | |
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VancouverSTI gets worked up as hell about things that don't matter, like a person asking a simple question about a downshift. If you suggested it's ok to pass on a double yellow as long as it's totally safe he'd be off the rails pissed. |
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