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Old 12-12-2007, 01:49 AM   #1
iRick.
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Default ouch..important tranny question 2.5i

so i have an auto [not my choice..just seemed most practical for the city :/ ]

anywayyy. i was messing aorund with the 1,2, 3 gears. and i wondered if i could downshift the same as my friends manual. so i was in 1st, hit about 3k rpm, shifted to 2nd, let it be for a tiny bit, then downshifted and floored it, i loved the response..but RIGHT when i did that someone called me, a call i couldn't miss, so i go to answer it and have no hand to shift gears for a second, forcing my car to sit at about 7k for a good second. i hated hearing that sound. just making sure if i don't do this again i won't have any problems?
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Old 12-12-2007, 05:44 AM   #2
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how'd you rev it all the way to 7k? Our revline starts at around 6500rpm
I'm sure if you only did it once, it'd be ok.
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Old 12-12-2007, 08:33 AM   #3
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Isnt there a rev limiter at 6750k? I think it should be fine.
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Old 12-12-2007, 10:57 AM   #4
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well 6750 yeah close enough..i thought i saw it pass 7 but just making sure. thanks guys
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Old 12-12-2007, 01:54 PM   #5
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Yea, I think youll be fine. I didnt mean to sound bitchy i just meant to make the point that there IS a rev limiter.
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Old 12-12-2007, 02:40 PM   #6
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eh once wont do harm, but shifting manually like that is no good for your car well your transmission to be exact
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Old 12-12-2007, 02:43 PM   #7
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Its no big deal to bounce off the rev limiter once every now and again. Its not great for the engine as far as wear and tear and prolonged engine life but there shouldnt be any damage from what you did. Thats why they have the limiter so if this happens you dont rev to the moon. Our cars make peak HP at like 6000-6500 RPM so im sure its okay to be in that range for a second.

Last edited by EvoSpeed; 12-12-2007 at 03:59 PM.
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Old 12-12-2007, 03:20 PM   #8
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Quote:
Originally Posted by EvoSpeed View Post
Our cars make peak HP at like 6000-6500 hp so im sure its okay to be in that range for a second.
dang! i thought we made peak near 170 hp!?!?! hahaha jk
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Old 12-12-2007, 04:00 PM   #9
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oops edit made.

Typing fast while multitasking without proofreading FTL.
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Old 12-12-2007, 06:22 PM   #10
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Quote:
Originally Posted by piker28 View Post
eh once wont do harm, but shifting manually like that is no good for your car well your transmission to be exact
this i need to know about..its not? i was told in our subaru's it is quite alright, while not the smartest option.

don't scare me here caus ei do it alot
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Old 12-12-2007, 06:34 PM   #11
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Just realize there are friction pieces that you wear doing that kind of stuff.
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Old 12-12-2007, 07:48 PM   #12
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well who was the one to tell you that it was alright? Also think about it when they are stress testing cars do you think that they are doing that? no your car is meant to stay in D id keep it there or 3rd i mean at most id go up but never down
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Old 12-12-2007, 08:20 PM   #13
iRick.
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Quote:
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well who was the one to tell you that it was alright? Also think about it when they are stress testing cars do you think that they are doing that? no your car is meant to stay in D id keep it there or 3rd i mean at most id go up but never down
really? cause the only reason why i ever do it is to downshift lol. its the only fun part
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Old 12-12-2007, 08:29 PM   #14
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i hear ya but thats the man reason most people buy the 5spds
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Old 12-12-2007, 09:46 PM   #15
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if I pass someone at a certain speed I downshift into 3 or 2 because in reality, it takes it too long from O/D. trust me, as a 4EAT owner, I know and others can back me up on it

~Clinton
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Old 12-13-2007, 12:32 AM   #16
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ya i feel you there. maybe i'l just stick to doing that for now on
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Old 12-13-2007, 01:14 PM   #17
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yea, but only do it when you need. and when taking off on snow/ice, keep it in second until you get up to speed, then put it into 3 and leave it there, because in O/D the car is basically 90/10 which I learnt the hard way [actually spun on SNOW tires]. keeping it in 3 keeps the tranny more active to transfer power. first-hand, I learnt these 2 things to do everytime I slowed down:

-slow down and put car into second while slowing to increase engine braking and to create less stress on brakes [my brakes are going because of NOT doing that]

-when you have to take off again, KEEP THE CAR IN SECOND [this allows the car to take off from second gear from a standstill; nay-sayers, READ THE MANUAL THAT COMES WITH THE CAR], and accelerate normally, and once you pass 30mph+ then shift and KEEP IT in 3 [unless you are on the highway].

***NOTE: THIS ONLY WORKS FOR 4EAT'S. 5MT's HAVE NO REAL SAY IN THIS***

~Clinton
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Old 12-13-2007, 02:27 PM   #18
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rev limiter prevents the engine to damage itself. thats why its there. i will jus tsit there and bounce, wont hurt the engine.
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Old 12-13-2007, 02:58 PM   #19
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manual shifting our ATs is perfectly fine. There are a TON of threads about it. There are people who have 80k miles and do it every time they drive. It won't hurt a thing.

Kevin
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Old 12-13-2007, 03:16 PM   #20
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wow. thanks for the wonderful advice. i've wondered about how we can make our AT more than AT lol. THANKS
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Old 12-13-2007, 04:50 PM   #21
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just don't down shift into any gear that will be putting you at more than 3.5k rpm...

Kevin
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Old 12-13-2007, 11:30 PM   #22
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The automatic trans, while horribly sluggish and power robbing in the newer impreza's, is not harmed by manually shifting. Weather you drive in "D" or 1, 2 3, etc. doesn't cause any abnormal or additional wear (besides the additional wear of extra shifting at the hand of the regretful AT owner). When you drive in "D" you use the same exact gears as 1,2,3 just without the ability to hold a gear. Now this doesnt mean being a dumbass wont get your trans slammed if you downshift at too high a speed causing overrev or forcing your engine into the rev limiter with no way to "bounce" off the limit because the wheels are now driving the engine instead of the engine driving the wheels. Rev Limiters are not idiot proof, just keep the engine speed limited while under acceleration due to cutting fuel, ignition or whatever it may be. However the limiter doesn't "apply the brakes" when you downshift at too high a wheel speed for the selected gear to prevent physically driving the engine to a overrev situation. (The ECU may not allow a downshift like this to occur in an AT, I don't know.)
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Old 12-14-2007, 09:14 PM   #23
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**NOTE: this will scare/annoy the 5MT owners reading this now**

to see how smart the subie ECU's are, do what I did a couple times:

go on a highway, and hit about 65-80mph and pull the shifter down to 1; the car will only dowmshift into 3rd. brake if you are going off to an exit and leave it there, and at 40-48mph it will downstift into second, then at 27-32mph, it will downshift into 1st.

Also, the ECU is smart enough to not granade itself on downshifts. it will only blip to reach ~5,600RPMs on downshift and knows what engine speed to down/upshift on, hence "Automatic"

~Clinton
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Old 12-15-2007, 04:10 PM   #24
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Quote:
Originally Posted by Clin10 View Post
**NOTE: this will scare/annoy the 5MT owners reading this now**

to see how smart the subie ECU's are, do what I did a couple times:

go on a highway, and hit about 65-80mph and pull the shifter down to 1; the car will only dowmshift into 3rd. brake if you are going off to an exit and leave it there, and at 40-48mph it will downstift into second, then at 27-32mph, it will downshift into 1st.

Also, the ECU is smart enough to not granade itself on downshifts. it will only blip to reach ~5,600RPMs on downshift and knows what engine speed to down/upshift on, hence "Automatic"

~Clinton
i'm too scared to try that, but i hope you aren't lying
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