4th gear RPM drop (AT) - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

BlueDubbinTDI · 10-11-2013, 12:37 AM

Its been doing this for as far back as I can remember. Every time the car shifts into 4th gear, in either M or D after about 1 second in the gear at constant peddle pressure the RPMs will drop about 15% of the rev range from wherever you are for about a half second then go back to where it was before the drop and keep climbing like it should have. It is incredibly noticable in the higher rev ranges obviously as it can drop like 500rpm or more. Driving fairly normal (shifts in the low to mid 2000s) its less noticeable when its like a 100rpm drop. Its always there though no avoiding it. Does anyone have any idea what could be causing this so I can go to the dealer with a little more knowledge. thanks

Craig · 10-11-2013, 12:42 AM

Happens to me too, from what I was told its merely the TQ converter locking in, I've gotten used to it and even utilize it when accelerating. If you add a bit of pressure around the time it usually happens you can lock it quicker, so fast its barely noticeable.

BlueDubbinTDI · 10-11-2013, 12:59 AM

Is there nothing that can be done about it? And why would it only be in that gear?

Pandle · 10-11-2013, 02:52 AM

Mine does this in second gear. It can be annoying at times...

Craig · 10-11-2013, 07:44 PM

Happens in all gears, its just more noticeable in 4th. Why does it happen? Its the torque converter locking in.... If you're unfamiliar with how this works this post is very helpful: http://xtremecarzone.com.au/index.php?showtopic=939

You can also check the 'how stuff works' it's really dumbed down but its pretty helpful if you're unaware.

Cadenz · 10-13-2013, 12:25 AM

This happens to me most notably in a 2nd to 3rd shift, and usually only if I'm in M mode.

mid_life_crisis · 10-13-2013, 11:20 AM

No chance this is just a lousy execution of rev matching?

10-11-2013, 12:37 AM	#1
BlueDubbinTDI Senior Member Join Date: Mar 2013 Drives: 2013 FR-S, 2012 MCS Location: Jax, FL Posts: 1,975 Thanks: 943 Thanked 570 Times in 356 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	4th gear RPM drop (AT) Its been doing this for as far back as I can remember. Every time the car shifts into 4th gear, in either M or D after about 1 second in the gear at constant peddle pressure the RPMs will drop about 15% of the rev range from wherever you are for about a half second then go back to where it was before the drop and keep climbing like it should have. It is incredibly noticable in the higher rev ranges obviously as it can drop like 500rpm or more. Driving fairly normal (shifts in the low to mid 2000s) its less noticeable when its like a 100rpm drop. Its always there though no avoiding it. Does anyone have any idea what could be causing this so I can go to the dealer with a little more knowledge. thanks

10-11-2013, 02:52 AM	#4
Pandle Member Join Date: Apr 2012 Drives: CBS BRZ Location: Washington Posts: 84 Thanks: 9 Thanked 16 Times in 11 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	Mine does this in second gear. It can be annoying at times... __________________ All kinds of gains....

10-13-2013, 11:20 AM	#7
mid_life_crisis Senior Member Join Date: May 2013 Drives: FR-S 10 #103 AT Location: NC Posts: 1,519 Thanks: 101 Thanked 599 Times in 347 Posts Mentioned: 5 Post(s) Tagged: 0 Thread(s)	No chance this is just a lousy execution of rev matching? __________________ Necessity may be the mother of Invention but Desperation is quite often the father. “Sex is like Bridge. If you don't have a good partner, you'd better have a good hand.” - Mae West Papa said, "son there's a lot of evil temptations out there. Best to try 'em all so you know which ones to avoid."

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10-11-2013, 12:42 AM	#2
Craig Senior Member Join Date: Jul 2012 Drives: Asphalt FRS Location: Central New Jersey Posts: 338 Thanks: 242 Thanked 191 Times in 66 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Happens to me too, from what I was told its merely the TQ converter locking in, I've gotten used to it and even utilize it when accelerating. If you add a bit of pressure around the time it usually happens you can lock it quicker, so fast its barely noticeable.

10-11-2013, 12:59 AM	#3
BlueDubbinTDI Senior Member Join Date: Mar 2013 Drives: 2013 FR-S, 2012 MCS Location: Jax, FL Posts: 1,975 Thanks: 943 Thanked 570 Times in 356 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Is there nothing that can be done about it? And why would it only be in that gear?

10-11-2013, 07:44 PM	#5
Craig Senior Member Join Date: Jul 2012 Drives: Asphalt FRS Location: Central New Jersey Posts: 338 Thanks: 242 Thanked 191 Times in 66 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Happens in all gears, its just more noticeable in 4th. Why does it happen? Its the torque converter locking in.... If you're unfamiliar with how this works this post is very helpful: http://xtremecarzone.com.au/index.php?showtopic=939 You can also check the 'how stuff works' it's really dumbed down but its pretty helpful if you're unaware.

10-13-2013, 12:25 AM	#6
Cadenz Member Join Date: May 2012 Drives: Subaru BRZ SWP Limited 2013 Location: Los Angeles, CA Posts: 54 Thanks: 29 Thanked 7 Times in 6 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	This happens to me most notably in a 2nd to 3rd shift, and usually only if I'm in M mode.

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