Automatic Transmission Surge - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

N1rve · 02-26-2016, 02:15 PM

Hi all,

Am I the only one who experiences a surge in M1 mode while downshifting from 2nd to 1st and coming to a stop?

Basically when I downshift into 1st while coming to a stop the car surges forward again. This happens around 10mph.

Edit: It's been getting rougher over the years.

go_a_way1 · 02-26-2016, 02:17 PM

Quote:

Originally Posted by N1rve

Hi all,

Am I the only one who experiences a surge in M1 mode while downshifting from 2nd to 1st and coming to a stop?

Basically when I downshift into 1st while coming to a stop the car surges forward again. This happens around 10mph.

Yup, take your foot off the gas, even slight pressure on the gas peddle will often cause that

go_a_way1 · 02-26-2016, 02:26 PM

Quote:

Originally Posted by new2subaru

I thought I read in the manual that you weren't supposed to downshift into 1st with the AT?

I do it like 30 times a day if not more, because racecar. I love the sound it and I downshift to use engine braking as much as I can

shiumai · 02-26-2016, 02:29 PM

why are you downshifting from 2nd to 1st? it'll do it automatically in manual mode. I never downshift when coming to a stop with my AT. I only downshift to change gears on the fly.

N1rve · 02-26-2016, 02:39 PM

Quote:

Originally Posted by new2subaru

lol So do I but am fairly gentle.

I was just tossing that out there to show how important it is not to jam it into first.

I did read that it the manual right?

Where in the manual is this? :O

go_a_way1 · 02-26-2016, 02:46 PM

Quote:

Originally Posted by shiumai

why are you downshifting from 2nd to 1st? it'll do it automatically in manual mode. I never downshift when coming to a stop with my AT. I only downshift to change gears on the fly.

Yeah I know but I like the engine braking and I didnt spend 4k on exhaust to not listen to it hahaha! I downshift and it hits 3-4k rpms from 2nd to 1st often.

Quote:

Originally Posted by new2subaru

lol So do I but am fairly gentle.

I was just tossing that out there to show how important it is not to jam it into first.

I did read that it the manual right?

If it was an issue I am sure I would have found out by now. I drive around in 1st alot too, like every time I am in a parking lot.

KDad2 · 02-26-2016, 03:06 PM

Most of the time I'll downshift all the way to 2nd. But, not usually on purpose into 1st. It does sound good though with a nice exhaust setup. I've had it since Nov 2012 and no issues. I'm also curious if it's in the manual.

go_a_way1 · 02-26-2016, 03:08 PM

I read the whole manual 3 years ago and don't remember reading that or I wouldn't do it haha. However AT and MT are very very different and I know for a fact you dont want to downshift into 1st on a MT but the AT is a whole different animal

go_a_way1 · 02-26-2016, 03:17 PM

Quote:

Originally Posted by new2subaru

Maybe that is what I read...It could have been on here. I'm old, so you have to cut me some slack lol

Either way, I downshift into 1st with my AT.

LOL I would say its 100% safe to do the way I beat on my car I would have broken something by now

FirestormHachiroku · 02-26-2016, 05:33 PM

I would stop doing that. In the MT (which I own) under normal conditions, you physically CANNOT shift from 2nd into 1st.
Emphasize "normal conditions."
You could force it if you want to but you'd probably crack a synchro. 1st and 2nd are not synchro meshed in the MT versions of these cars.

The surge may be the sign that the transmission is failing. It could mean that the repeated stress on the transmission is causing a slip and as it gets worse you'll eventually lose 1st gear.
You say it's not broken yet, but the surge is proof that something is not working correctly! Therefore broken!

Can't deny that it probably sounds sweet though...

Sent from my iPhone using Tapatalk

go_a_way1 · 02-26-2016, 05:36 PM

Quote:

Originally Posted by FirestormHachiroku

I would stop doing that. In the MT (which I own) under normal conditions, you physically CANNOT shift from 2nd into 1st.
Emphasize "normal conditions."
You could force it if you want to but you'd probably crack a synchro. 1st and 2nd are not synchro meshed in the MT versions of these cars.

The surge may be the sign that the transmission is failing. It could mean that the repeated stress on the transmission is causing a slip and as it gets worse you'll eventually lose 1st gear.
You say it's not broken yet, but the surge is proof that something is not working correctly! Therefore broken!

Can't deny that it probably sounds sweet though...

Sent from my iPhone using Tapatalk

MT and AT are very very different. I dont think its hurting anything. The reason he gets a surge is because he is adding fuel and the ECU also adds fuel to blip the throttle therefore the car makes more power then anticipated and accelerates a bit. if OP stays off the gas then it will blip and do its thing fine.

soulreapersteve · 02-26-2016, 06:46 PM

Quote:

Originally Posted by new2subaru

I thought I read in the manual that you weren't supposed to downshift into 1st with the AT?

I've read the manual 3 times front to back. Only the MT, where it's not recommended to downshift into 1st.

Quote:

Originally Posted by go_a_way1

I do it like 30 times a day if not more, because racecar. I love the sound it and I downshift to use engine braking as much as I can

Quote:

Originally Posted by go_a_way1

Yeah I know but I like the engine braking and I didnt spend 4k on exhaust to not listen to it hahaha! I downshift and it hits 3-4k rpms from 2nd to 1st often.

If it was an issue I am sure I would have found out by now. I drive around in 1st alot too, like every time I am in a parking lot.

Same here! Been doing it for months, many many many times/day. Nothing has broken yet. Btw.... You spent 4k on exhaust? Whatchu get? The Greddy Titanium??

http://www.ft86speedfactory.com/gred...l#.VtDVmEautyk

KoolBRZ · 02-26-2016, 06:54 PM

Quote:

Originally Posted by N1rve

Hi all,

Am I the only one who experiences a surge in M1 mode while downshifting from 2nd to 1st and coming to a stop?

Basically when I downshift into 1st while coming to a stop the car surges forward again. This happens around 10mph.

Edit: It's been getting rougher over the years.

Can you post a video with sound? It could have something to do with your tune or exhaust system. A restricted Cat, or leaky gasket could be affecting it.

go_a_way1 · 02-26-2016, 07:00 PM

Quote:

Originally Posted by soulreapersteve

I've read the manual 3 times front to back. Only the MT, where it's not recommended to downshift into 1st.

Same here! Been doing it for months, many many many times/day. Nothing has broken yet. Btw.... You spent 4k on exhaust? Whatchu get? The Greddy Titanium??

http://www.ft86speedfactory.com/gred...l#.VtDVmEautyk

I meant 3K lol, at least I think it was 3Kish
Borla, local shop built an over pipe as there were not many on the market at the time, motiv test pipe, and TRD catback which was also modified. That was over 3K CAD with shipping duty ect when I did it all a long ass time ago if I remember right

02-26-2016, 02:15 PM	#1
N1rve Senior Member Join Date: Oct 2013 Drives: 2019 BMW ///M4 Location: Los Angeles, CA Posts: 2,332 Thanks: 102 Thanked 1,167 Times in 714 Posts Mentioned: 28 Post(s) Tagged: 0 Thread(s)	Automatic Transmission Surge Hi all, Am I the only one who experiences a surge in M1 mode while downshifting from 2nd to 1st and coming to a stop? Basically when I downshift into 1st while coming to a stop the car surges forward again. This happens around 10mph. Edit: It's been getting rougher over the years. __________________ N1rve 2019 BMW ///M4 - Alpine White \| Sakhir Orange/Black Leather \| M-DCT \| Executive Package \| 19" Black 437M Wheels \| Carbon Fiber Trim \| Sunroof \| Active Blind Spot \| Heated Steering Wheel \| Adaptive M Suspension

02-26-2016, 02:29 PM	#4
shiumai Senior Member Join Date: Mar 2013 Drives: 2013 DGM BRZ, 2020 C8 Corvette Location: USofA! Posts: 1,760 Thanks: 963 Thanked 1,893 Times in 787 Posts Mentioned: 41 Post(s) Tagged: 1 Thread(s)	why are you downshifting from 2nd to 1st? it'll do it automatically in manual mode. I never downshift when coming to a stop with my AT. I only downshift to change gears on the fly. __________________ My DGM BRZ vid: https://www.youtube.com/watch?v=0OL9OhxexAA My car journal thread: http://www.ft86club.com/forums/showthread.php?t=43402

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02-26-2016, 03:06 PM	#7
KDad2 Senior Member Join Date: Jan 2014 Drives: 2013 Raven Location: Texas Posts: 485 Thanks: 202 Thanked 345 Times in 183 Posts Mentioned: 2 Post(s) Tagged: 1 Thread(s)	Most of the time I'll downshift all the way to 2nd. But, not usually on purpose into 1st. It does sound good though with a nice exhaust setup. I've had it since Nov 2012 and no issues. I'm also curious if it's in the manual.

02-26-2016, 05:33 PM	#10
FirestormHachiroku Member Join Date: Jul 2015 Drives: 2015 Scion FR-S Firestorm Location: Brantford, ON Posts: 20 Thanks: 26 Thanked 10 Times in 7 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	I would stop doing that. In the MT (which I own) under normal conditions, you physically CANNOT shift from 2nd into 1st. Emphasize "normal conditions." You could force it if you want to but you'd probably crack a synchro. 1st and 2nd are not synchro meshed in the MT versions of these cars. The surge may be the sign that the transmission is failing. It could mean that the repeated stress on the transmission is causing a slip and as it gets worse you'll eventually lose 1st gear. You say it's not broken yet, but the surge is proof that something is not working correctly! Therefore broken! Can't deny that it probably sounds sweet though... Sent from my iPhone using Tapatalk

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