Weird AT Transmission shifts - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

Ernest72 · 08-28-2017, 07:58 PM

So my AT runs perfect, no issues shifts fast, car is really great. Only issue is if I make a hard left with acceleration the tranny does not shift immediately and will go to 4000 before shifting. Does not do this on hard rights. Not really a problem but its noticeable. Any of the AT guys experience this?

HKz · 08-28-2017, 08:54 PM

so if I'm understanding the concern correctly, while in auto mode when you take a hard left your transmissions goes up a gear and drops your revs to 4000 but when you take a right it stays in a lower gear with the revs up? do you have sport mode on? if so, it shouldn't go up a gear unless you aren't really on the throttle.

phrosty · 08-28-2017, 09:06 PM

have never experienced this.

NOI · 08-28-2017, 09:58 PM

nope.

rjgough95 · 08-29-2017, 11:32 AM

As odd of a thing as this is I can actually recall having this happen on my car. Reason being that there is a left turn right before I get home at a light and if im just barely on the pedal it shifts normally for the most part. Now if I give it a little more throttle taking the turn it does seem to rev up higher and hold it before shifting. Reason is I can remember noticing it was because I was thinking why hasn't it shifted up yet.

winstonscifi · 08-29-2017, 02:13 PM

I also get a certain odd "feeling" when powering into a left turn. I just realized I may get some strange responses from certain people on this forum about this post.....

But seriously, there is a certain "feeling" that I get from the car every once in a while - it's hard to replicate - could be the transmission - never thought of that.

Dadhawk · 08-29-2017, 02:39 PM

Actually @Earnst72 this may not be an issue but a design feature.

As I recall, the AT was designed to hold the current gear in aggressive curves to avoid a mid-shift that could cause issues with traction. This emulates how on a manual transmission you would not shift gears in the middle of a hard turn. There was discussion of this early on in 2012 when released, but I didn't search.

I have experienced this myself (left or right) if I'm really pressing the throttle accelerating through a turn when in full auto.

rjgough95 · 08-31-2017, 08:20 AM

Quote:

Originally Posted by Dadhawk

Actually @Earnst72 this may not be an issue but a design feature.

As I recall, the AT was designed to hold the current gear in aggressive curves to avoid a mid-shift that could cause issues with traction. This emulates how on a manual transmission you would not shift gears in the middle of a hard turn. There was discussion of this early on in 2012 when released, but I didn't search.

I have experienced this myself (left or right) if I'm really pressing the throttle accelerating through a turn when in full auto.

This is what I always assumed and decided not to worry about it because it seemed to make the most sense.

Ernest72 · 08-31-2017, 05:37 PM

Thanks for the responses. The explanation makes sense so I will not worry about it. Just weird it seems to do it more on left turns than right. No big deal. Ill just press the accelerator down a little bit more.

08-28-2017, 07:58 PM	#1
Ernest72 Senior Member Join Date: Jul 2016 Drives: 16 Silver BRZ, 04 Silver WRX wagon Location: Rockland county, NY Posts: 1,410 Thanks: 181 Thanked 768 Times in 439 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Weird AT Transmission shifts So my AT runs perfect, no issues shifts fast, car is really great. Only issue is if I make a hard left with acceleration the tranny does not shift immediately and will go to 4000 before shifting. Does not do this on hard rights. Not really a problem but its noticeable. Any of the AT guys experience this?

08-28-2017, 09:06 PM	#3
phrosty Senior Member Join Date: Apr 2013 Drives: 2013 FR-S Location: Seattle Posts: 806 Thanks: 202 Thanked 320 Times in 199 Posts Mentioned: 18 Post(s) Tagged: 1 Thread(s)	have never experienced this. __________________ 2013 Whiteout 6AT FR-S \| Perrin Inlet Tube + 2.75" CAI \| OpenFlash Header \| P&L Catback \| 4.88 Final Drive \| Dialed in OFT 2.0x Stage 2 E85 \| 18x8 Enkei Raijin + 225/40 Michelin Pilot Super Sport \| 17x7 Stock + 215/45 Michelin X-Ice Xi-2

08-29-2017, 11:32 AM	#5
rjgough95 Member Join Date: Oct 2014 Drives: 13 Subaru BRZ, 02 7.3 F350 Diesel Location: virginia fauquier Posts: 87 Thanks: 19 Thanked 13 Times in 13 Posts Mentioned: 0 Post(s) Tagged: 2 Thread(s)	As odd of a thing as this is I can actually recall having this happen on my car. Reason being that there is a left turn right before I get home at a light and if im just barely on the pedal it shifts normally for the most part. Now if I give it a little more throttle taking the turn it does seem to rev up higher and hold it before shifting. Reason is I can remember noticing it was because I was thinking why hasn't it shifted up yet. __________________ 2.5" Non-resonated Perrin catback - Hks dual resonator front pipe - Borla UEL headers - K&N drop in - Supertek intake pipe - Megans Racing strut bar - Racer X Fabrication cylinder brace - Valenti tail lights - Veloxs Motorsports front splitter - Galvez Customs rear diffuser - Open Flash Tuner - GCS paddles - Apex ARC8 Track Wheels

08-29-2017, 02:39 PM	#7
Dadhawk 1st86 Driver! Join Date: Feb 2012 Drives: '13 FR-S (#3 of 1st 86) Location: Powder Springs, GA Posts: 19,811 Thanks: 38,817 Thanked 24,936 Times in 11,375 Posts Mentioned: 182 Post(s) Tagged: 4 Thread(s)	Actually @Earnst72 this may not be an issue but a design feature. As I recall, the AT was designed to hold the current gear in aggressive curves to avoid a mid-shift that could cause issues with traction. This emulates how on a manual transmission you would not shift gears in the middle of a hard turn. There was discussion of this early on in 2012 when released, but I didn't search. I have experienced this myself (left or right) if I'm really pressing the throttle accelerating through a turn when in full auto. __________________ Visit my Owner's Journal where I wax philosophic on all things FR-S Post your 86 or see others in front of a(n) (in)famous landmark. What fits in your 86? Show us the "Junk In Your Trunk".

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08-28-2017, 08:54 PM	#2
HKz Reformed Join Date: Sep 2014 Drives: '23 GRC, '11 Prius, '04 RAV4 Location: Mesa, AZ Posts: 1,312 Thanks: 1,234 Thanked 1,133 Times in 588 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	so if I'm understanding the concern correctly, while in auto mode when you take a hard left your transmissions goes up a gear and drops your revs to 4000 but when you take a right it stays in a lower gear with the revs up? do you have sport mode on? if so, it shouldn't go up a gear unless you aren't really on the throttle.

08-29-2017, 02:13 PM	#6
winstonscifi Senior Member Join Date: Sep 2016 Drives: 2015 Firestorm Red Scion FR-S Location: Plymouth Minnesota - just west of Minneapolis Posts: 192 Thanks: 269 Thanked 186 Times in 92 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	I also get a certain odd "feeling" when powering into a left turn. I just realized I may get some strange responses from certain people on this forum about this post..... But seriously, there is a certain "feeling" that I get from the car every once in a while - it's hard to replicate - could be the transmission - never thought of that.

08-31-2017, 05:37 PM	#9
Ernest72 Senior Member Join Date: Jul 2016 Drives: 16 Silver BRZ, 04 Silver WRX wagon Location: Rockland county, NY Posts: 1,410 Thanks: 181 Thanked 768 Times in 439 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Thanks for the responses. The explanation makes sense so I will not worry about it. Just weird it seems to do it more on left turns than right. No big deal. Ill just press the accelerator down a little bit more.

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