Automatic 2-1 rough downshifting

wstar · 05-15-2011, 09:48 PM

It only does this when you let it downshift for you, because you've gone way below useful RPMs. IMHO, either downshift earlier and stay in a useful band, or if you're coasting down to a stop gently just pop it into D or N.

PapoZalsa · 05-15-2011, 09:53 PM

Quote:

Originally Posted by Venom

Mine AT does the same thing....the downshift into lower gears isnt as smooth as id like it to be. I dont notice it at all when I put it into normal drive mode.

You know you resurrected this thread from 2009.

frost · 04-14-2009, 10:44 PM

Thanks Mola, good to know it may get better.

wstar · 04-14-2009, 11:25 PM

Quote:

Originally Posted by frost

Thanks Mola, good to know it may get better.

Mine has been pretty variable. Sometimes I don't notice it for a day or two, then I get a really hard hit of this the next day. I don't think it's the car getting better, I think it's that I'm adapting my driving to avoid it more.

frost · 04-14-2009, 11:28 PM

I'll keep my fingers crossed. I'm kind of regretting not getting the manual, but I remembered how much I hated the stick in traffic, so I went with something different.

wstar · 04-14-2009, 11:36 PM

Quote:

Originally Posted by frost

I'll keep my fingers crossed. I'm kind of regretting not getting the manual, but I remembered how much I hated the stick in traffic, so I went with something different.

Yeah it's a tough call. There are a lot of times I wish I had the stick instead of the 7AT. But on the other hand, flipping to D in traffic is convenient, and this is a daily-driver in a pretty congested city (not that I actually commute to work, but still). Being able to let a friend or girlfriend drive the car home when you've had a bit to drink is handy too.

frost · 04-14-2009, 11:38 PM

I've been to houston many times (Family lives in sugarland), and I wouldn't want a stick there. We have bad traffic too, but it might just be worse there.

epod86 · 04-15-2009, 06:56 PM

Quote:

Originally Posted by frost

I've been to houston many times (Family lives in sugarland), and I wouldn't want a stick there. We have bad traffic too, but it might just be worse there.

Maybe, I've always had the worst traffic with accidents on roads trying to get back into Houston. Then again, the first time I was in the state, 5 minutes after leaving the airport there was a bumper damage crash at speed. Everyone kept driving. My dad said that was why I was going to be costing him 2k a year in this state

I'm going to assume that the 2-1 downshift is rough because of the ratios. 1st is a 'pull away gear' that a manual user never downshifts into (street driving) because the ratio is really high. It's designed to get the car moving from a standstill, so the ratio is huge to get the torque to the stopped wheels.

The shift may be more noticeable because the Z is a 7 speed, and so it's relying less on the viscous and instead on making the shift to get the torque curves lined up than say a 4 speed. Then again, our hauler Commander really had some rough shifts at altitude from 4th to 3rd, followed by a very depressingly high rev as it weezed over the mountains.

I think that use will let you know how the computer thinks to try and avoid or mitigate the shift shock with time.

spearfish25 · 04-15-2009, 07:00 PM

I live in Chicago with my 6MT. Our traffic can be horrendous, but I've made lemonade from lemons...bad traffic makes me get off on the back roads and gives me more time to drive home, enjoy the car, and zip through corners, turns, lights, etc etc.

epod86 · 04-15-2009, 07:18 PM

Quote:

Originally Posted by spearfish25

I live in Chicago with my 6MT. Our traffic can be horrendous, but I've made lemonade from lemons...bad traffic makes me get off on the back roads and gives me more time to drive home, enjoy the car, and zip through corners, turns, lights, etc etc.

Great suggestion

I've gone manual, and any 'fun' car will be manual, daily driver or not.

meleazar · 11-03-2010, 01:08 AM

"Misery loves Company" It actually might be a characteristic of the car. I have about 16,000 miles on it and the jerk is still there. I actually remembered that first jerk coming out of the dealership's parking lot. I was hoping that with a little wear and tear, this issue would eventually disappear. I know some say that they don't experience this jerk and others do. As WSTAR mentions, I do feel the jerk between 2nd & 1st mainly when I do slow decelererations, but if I pound on the brake, the jerking pretty much becomes non-existent. The thing that somewhat bugs me is that it doesn't always happen. Shifting D to M makes this jerk even more prominent, so I end up just upshifting with M and then I switch it to D for auto-downshifting. I actually flipped my first 370. God rest her soul

She also had this downshift jerk issue between 1&2. Well anyway, thanks to Insurance and knowing that the safety features work well, I just had to get another one. This car is like a drug. To be honest, I think these cars were made to be driven hard. A very good buy for the specs and the price. I just hope these jerking issues we are experiencing though doesn't force us to replace our transmissions every few years. (fingers crossed)

Diocletian · 11-03-2010, 09:09 AM

When the car is coasting to a stop and I'm still in second I ease off the brake and downshift into first. Downshift Revmatch takes care of the rest, then I reapply the brake. Smooth stops every time! What ever you do don't downshift as you depress the brake, the car WILL lurch forward when it shifts and if you're to close to a car already it'll ruin your day.

antman22 · 11-03-2010, 12:20 PM

In my 7AT, like others have stated, only in M mode do i notice the sudden jerk. Its not that bad, but it is noticeable compared to a stop in D mode.

now i just pull the ebrake when in M mode.

kidding. kidding.

wilsonp · 11-03-2010, 12:32 PM

I don't drive in D very much, but I never have a jerk stopping. I don't think I see it downshift to 1 until I'm stopped, though?

OTOH, in M mode I notice a jerk more from 4 to 3 or may be 3 to 2, not 2 to 1.

I don't like braking late in traffic, but it makes coasting down difficult to do smoothly. I wish the SRM worked on the automatic down shifts as well to help smooth that out.

ninous26 · 11-03-2010, 01:12 PM

This is normal. The tranny in my AT G does this and its annoying.. I have confirmed this with other people in the G world..

You should see what happens when you're rolling around 5 mph in 2nd then tap it into first lol. When I do that some electronic module thing starts going off and makes a "t-rrrrr" zipping sound for a split second then there is a plusing sound.. This all happens very quick but all normal.

Edit: Just to be clear. Yes my car has a violent jerky shaky down shift in "D" coming from 2-1 when going slow.. The triptronic thing is just as bad. Normal.

05-15-2011, 09:48 PM	#1 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3595	It only does this when you let it downshift for you, because you've gone way below useful RPMs. IMHO, either downshift earlier and stay in a useful band, or if you're coasting down to a stop gently just pop it into D or N. __________________ 7AT Track Car! Journal thread / Car setup details

11-03-2010, 09:09 AM	#12 (permalink)
Diocletian Enthusiast Member Join Date: Mar 2010 Location: Orlando, Fl Posts: 350 Drives: 09 370z CY A7 Rep Power: 16	When the car is coasting to a stop and I'm still in second I ease off the brake and downshift into first. Downshift Revmatch takes care of the rest, then I reapply the brake. Smooth stops every time! What ever you do don't downshift as you depress the brake, the car WILL lurch forward when it shifts and if you're to close to a car already it'll ruin your day. __________________ Injen Dual CAI \| Illuminated Kick plates \| Stillen Sway bar kit \| F.I TDX w/ 12" Resonators \| F.I HFC's \| UpRev Tune \| 300HP/225tq Mustang Dyno

11-03-2010, 12:32 PM	#14 (permalink)
wilsonp A True Z Fanatic Join Date: Jul 2010 Location: Virginia Posts: 1,134 Drives: 2009 Touring Sp Nav Rep Power: 17	I don't drive in D very much, but I never have a jerk stopping. I don't think I see it downshift to 1 until I'm stopped, though? OTOH, in M mode I notice a jerk more from 4 to 3 or may be 3 to 2, not 2 to 1. I don't like braking late in traffic, but it makes coasting down difficult to do smoothly. I wish the SRM worked on the automatic down shifts as well to help smooth that out. __________________ 2014 Cayman S PDK Sport Chrono White/Black Was 2009 370Z Touring Sport+Nav 7AT Metallic Black/Persimmon Was 1991 NSX Auto Black/Black Last edited by wilsonp; 05-29-2012 at 10:50 PM.

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04-14-2009, 10:44 PM	#3 (permalink)
frost Retired admin Join Date: Dec 2008 Location: Winterfell Posts: 106,613 Drives: Your Wife Crazy Rep Power: 0	Thanks Mola, good to know it may get better.

04-14-2009, 11:28 PM	#5 (permalink)
frost Retired admin Join Date: Dec 2008 Location: Winterfell Posts: 106,613 Drives: Your Wife Crazy Rep Power: 0	I'll keep my fingers crossed. I'm kind of regretting not getting the manual, but I remembered how much I hated the stick in traffic, so I went with something different.

04-14-2009, 11:38 PM	#7 (permalink)
frost Retired admin Join Date: Dec 2008 Location: Winterfell Posts: 106,613 Drives: Your Wife Crazy Rep Power: 0	I've been to houston many times (Family lives in sugarland), and I wouldn't want a stick there. We have bad traffic too, but it might just be worse there.

04-15-2009, 07:00 PM	#9 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	I live in Chicago with my 6MT. Our traffic can be horrendous, but I've made lemonade from lemons...bad traffic makes me get off on the back roads and gives me more time to drive home, enjoy the car, and zip through corners, turns, lights, etc etc.

11-03-2010, 01:08 AM	#11 (permalink)
meleazar Base Member Join Date: Nov 2010 Location: Buena Park Posts: 7 Drives: 09 Nissan 370Z AT Rep Power: 15	"Misery loves Company" It actually might be a characteristic of the car. I have about 16,000 miles on it and the jerk is still there. I actually remembered that first jerk coming out of the dealership's parking lot. I was hoping that with a little wear and tear, this issue would eventually disappear. I know some say that they don't experience this jerk and others do. As WSTAR mentions, I do feel the jerk between 2nd & 1st mainly when I do slow decelererations, but if I pound on the brake, the jerking pretty much becomes non-existent. The thing that somewhat bugs me is that it doesn't always happen. Shifting D to M makes this jerk even more prominent, so I end up just upshifting with M and then I switch it to D for auto-downshifting. I actually flipped my first 370. God rest her soul She also had this downshift jerk issue between 1&2. Well anyway, thanks to Insurance and knowing that the safety features work well, I just had to get another one. This car is like a drug. To be honest, I think these cars were made to be driven hard. A very good buy for the specs and the price. I just hope these jerking issues we are experiencing though doesn't force us to replace our transmissions every few years. (fingers crossed)

11-03-2010, 12:20 PM	#13 (permalink)
antman22 Track Member Join Date: Dec 2009 Location: Dallas TX Posts: 597 Drives: 09 PG 370z 7AT Rep Power: 17	In my 7AT, like others have stated, only in M mode do i notice the sudden jerk. Its not that bad, but it is noticeable compared to a stop in D mode. now i just pull the ebrake when in M mode. kidding. kidding.

11-03-2010, 01:12 PM	#15 (permalink)
ninous26 Base Member Join Date: Sep 2009 Location: Phoenix AZ Posts: 112 Drives: 03 G35 black 5AT Rep Power: 16	This is normal. The tranny in my AT G does this and its annoying.. I have confirmed this with other people in the G world.. You should see what happens when you're rolling around 5 mph in 2nd then tap it into first lol. When I do that some electronic module thing starts going off and makes a "t-rrrrr" zipping sound for a split second then there is a plusing sound.. This all happens very quick but all normal. Edit: Just to be clear. Yes my car has a violent jerky shaky down shift in "D" coming from 2-1 when going slow.. The triptronic thing is just as bad. Normal.