Concerning shift - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

MidnightFumes · 11-15-2020, 06:22 AM

So I've had my AT FR-S for about a year, it's always had a pretty hard shift in my opinion compared to other cars I've had but today I happened to forget it was in "paddle shifter" mode and before I could shift it on my own from 1st to 2nd it did it by itself, but shifted extremely hard (threw me forward in my seat pretty much) I drove for about another hour or so that day and it seemed like nothing was really different, but that hard shift kinda concerned me considering I never experienced it before, and I was wondering if anyone could explain to me why that happened

This might be a noob question but I haven't been driving very long and couldn't quite find a similar situation someone has had online from my searches.

Also if this is something out of the ordinary, some background: it is coming up on 100,000 miles soon and i haven't done much maintenance yet other than the regular oil changes.

Ashikabi · 11-15-2020, 10:12 AM

Quote:

Originally Posted by MidnightFumes

So I've had my AT FR-S for about a year, it's always had a pretty hard shift in my opinion compared to other cars I've had but today I happened to forget it was in "paddle shifter" mode and before I could shift it on my own from 1st to 2nd it did it by itself, but shifted extremely hard (threw me forward in my seat pretty much) I drove for about another hour or so that day and it seemed like nothing was really different, but that hard shift kinda concerned me considering I never experienced it before, and I was wondering if anyone could explain to me why that happened

This might be a noob question but I haven't been driving very long and couldn't quite find a similar situation someone has had online from my searches.

Also if this is something out of the ordinary, some background: it is coming up on 100,000 miles soon and i haven't done much maintenance yet other than the regular oil changes.

Maybe transmission needs it's fluid changed

Sent from my ONEPLUS A5010 using Tapatalk

humfrz · 11-15-2020, 02:13 PM

Quote:

Originally Posted by MidnightFumes

So I've had my AT FR-S for about a year, it's always had a pretty hard shift in my opinion compared to other cars I've had but today I happened to forget it was in "paddle shifter" mode and before I could shift it on my own from 1st to 2nd it did it by itself, but shifted extremely hard (threw me forward in my seat pretty much) I drove for about another hour or so that day and it seemed like nothing was really different, but that hard shift kinda concerned me considering I never experienced it before, and I was wondering if anyone could explain to me why that happened

This might be a noob question but I haven't been driving very long and couldn't quite find a similar situation someone has had online from my searches.

Also if this is something out of the ordinary, some background: it is coming up on 100,000 miles soon and i haven't done much maintenance yet other than the regular oil changes.

Howdy, MidnightFumes and welcome to our forum -

If the AT fluid hasn't been changed, I'd suggest you go with @Ashikabi 's suggestion and have the fluid changed.

Spuds · 11-15-2020, 10:25 PM

Wait, an upshift threw you forward on your seat?

Celica00 · 11-16-2020, 11:35 AM

Quote:

Originally Posted by Spuds

Wait, an upshift threw you forward on your seat?

If the transmission was in first and went very swiftly into second before the engine rpms could go down quick enough and match, that would cause a forward lurch when the trans and engine engaged, right?

OP I wouldn't worry about any lasting damage. These transmissions seem to be able to take a beating on stock power. I've made enough terrible shifts I'm surprised I haven't shattered my clutch yet (granted it's manual and you're rocking auto). Sounds like you need to swap fluids though.

Spuds · 11-16-2020, 12:28 PM

Quote:

Originally Posted by Celica00

If the transmission was in first and went very swiftly into second before the engine rpms could go down quick enough and match, that would cause a forward lurch when the trans and engine engaged, right?

OP I wouldn't worry about any lasting damage. These transmissions seem to be able to take a beating on stock power. I've made enough terrible shifts I'm surprised I haven't shattered my clutch yet (granted it's manual and you're rocking auto). Sounds like you need to swap fluids though.

Yes, the car would lurch forward under those circumstances, but that would push the driver back into their seat, not throw them forward. The only thing that would throw them forward would be sudden acceleration in a rearward direction.

Ashikabi · 11-16-2020, 01:23 PM

Quote:

Originally Posted by Spuds

Yes, the car would lurch forward under those circumstances, but that would push the driver back into their seat, not throw them forward. The only thing that would throw them forward would be sudden acceleration in a rearward direction.

I lurch forward every time I shift up(when I clutch in). Maybe it just took longer than expected to go into gear?

Sent from my ONEPLUS A5010 using Tapatalk

Spuds · 11-16-2020, 01:31 PM

Quote:

Originally Posted by Ashikabi

I lurch forward every time I shift up(when I clutch in). Maybe it just took longer than expected to go into gear?

Sent from my ONEPLUS A5010 using Tapatalk

That's kinda what I was thinking. Could be entirely driver perception, rather than any actual mechanical happenings. If the AT let you hit the fuel cut before shifting it might seem like sudden deceleration when really you just stopped accelerating suddenly.

Could also be exactly what you said, driver expected to be pushed back and prepared for that, but it came a fraction of a second late.

HKz · 11-16-2020, 02:21 PM

OP sounds like has a few years of previous owner history he can't account for. I was dding an auto 86 for a few years and I do not remember any shifts being hard, just typical smooth torque converter engagement every time. Hard shifts should not be normal for the AT.. Technically the AT fluid should've been changed 40,000 miles ago so should start with that.

PatSciFRS · 11-18-2020, 10:46 AM

Could it be that the rev limiter kicked in?

Celica00 · 11-18-2020, 06:46 PM

Quote:

Originally Posted by Spuds

Yes, the car would lurch forward under those circumstances, but that would push the driver back into their seat, not throw them forward. The only thing that would throw them forward would be sudden acceleration in a rearward direction.

Ah I see. My brain has the hardest time visualizing what would cause forward vs backward lurching.

finch1750 · 11-19-2020, 10:09 AM

sounds like you need an atf change

daniloneil8 · 11-22-2020, 07:55 AM

100k mile service.
Time to spend some money.

Brake flush
Brake pad inspect
Rear Diff fluid
Steering fluid
Suspension inspect.
Air filter

11-15-2020, 06:22 AM	#1
MidnightFumes Junior Member Join Date: Nov 2020 Drives: 2014 Scion FR-S Location: United States Posts: 3 Thanks: 0 Thanked 1 Time in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Concerning shift So I've had my AT FR-S for about a year, it's always had a pretty hard shift in my opinion compared to other cars I've had but today I happened to forget it was in "paddle shifter" mode and before I could shift it on my own from 1st to 2nd it did it by itself, but shifted extremely hard (threw me forward in my seat pretty much) I drove for about another hour or so that day and it seemed like nothing was really different, but that hard shift kinda concerned me considering I never experienced it before, and I was wondering if anyone could explain to me why that happened This might be a noob question but I haven't been driving very long and couldn't quite find a similar situation someone has had online from my searches. Also if this is something out of the ordinary, some background: it is coming up on 100,000 miles soon and i haven't done much maintenance yet other than the regular oil changes.

11-18-2020, 10:46 AM	#10
PatSciFRS Member Join Date: Mar 2014 Drives: Scion FRS 10 Series Location: USA Posts: 48 Thanks: 1 Thanked 22 Times in 13 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Another possibility Could it be that the rev limiter kicked in?

11-19-2020, 10:09 AM	#12
finch1750 Undisputed El Presidente Join Date: Jun 2012 Drives: Zenki 37J ZN6 Location: Stockton, CA Posts: 11,571 Thanks: 9,382 Thanked 9,397 Times in 5,261 Posts Mentioned: 374 Post(s) Tagged: 33 Thread(s)	sounds like you need an atf change __________________ "Just like how a strut bar somehow enables you to corner 20MPH faster around a cloverleaf on-ramp, when the reality is, you can do it already but you just don't have to balls to do it." - CSG David

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