A/T down shifting problem

RR_Oso · 08-31-2012, 01:25 AM

Hi! Well, the other day, I took my car out for a "spirited" ride down an old country road that follows a valley floor. The road would go from straights that would allow 100+mph, down to tight corners that would have tires screaching at 40mph. Anyway, about 75% of the way through the 42 minute trip from one side to the other, I started noticing that the car wouldn't let me down shift from 3rd to 2nd gear, using either the paddles or the gear selector, unless I was below 3700 rpm's. I wanted to see if anyone else has experienced this situation before, and if so, what did you do to fix it? My best guess... the transmission fluid may of been getting a little to hot! I was thinking a Stillen transmission cooler, but I rather hold onto the $300 if that wouldn't fix my problem... what's your $.02?

wilsonp · 08-31-2012, 01:42 AM

What was your oil temp? That sounds more like the engine lowered the redline due to overheating - could you exceed 3700 otherwise?

RR_Oso · 08-31-2012, 02:01 AM

I don't remember what the oil temp was... I remember the gauge wasn't maxed out, but I'd have to go out and look at the gauge to get the approx temp... I remember the position of the needle... about 1 o'clock.

Yes, I was able to carry the car up to redline. Once I coasted a little bit and got the rpm down, it would downshift, and then let me take it at far up to redline as i wanted before I shifted up.

Navyboy916 · 08-31-2012, 07:36 PM

That means ur transmission oil is to hot and it's a fail safe for the engine. I had the same problem but I installed a transmission oil cooler and haven't had the problem again I recommend that to you as well

RR_Oso · 09-01-2012, 12:45 AM

Quote:

Originally Posted by Navyboy916

That means ur transmission oil is to hot and it's a fail safe for the engine. I had the same problem but I installed a transmission oil cooler and haven't had the problem again I recommend that to you as well

What brand did you get? Did you have it professionally installed, or was it pretty simple to do?

XwChriswX · 09-01-2012, 12:49 AM

Quote:

Originally Posted by RR_Oso

I don't remember what the oil temp was... I remember the gauge wasn't maxed out, but I'd have to go out and look at the gauge to get the approx temp... I remember the position of the needle... about 1 o'clock.

Yes, I was able to carry the car up to redline. Once I coasted a little bit and got the rpm down, it would downshift, and then let me take it at far up to redline as i wanted before I shifted up.

That sounds like the 260* area for oil temp, you prolly got pushed into limp mode.

Navyboy916 · 09-01-2012, 03:49 AM

Stillen and it's really simple to install

RR_Oso · 09-01-2012, 04:21 PM

Quote:

Originally Posted by Navyboy916

Stillen and it's really simple to install

Ok... Stillen would be perfect! The Company I work for, owns the local Nissan Dealership, and it happens to be an authorized Stillen supplier.... Stillen parts on employee discount!!!

ND370z · 09-01-2012, 04:35 PM

Quote:

Originally Posted by Navyboy916

Stillen and it's really simple to install

GTM has one as well.

08-31-2012, 01:25 AM	#1 (permalink)
RR_Oso Base Member Join Date: Aug 2012 Location: Monterey Bay, CA Posts: 9 Drives: 09 Nissan 370Z Rep Power: 13	A/T down shifting problem Hi! Well, the other day, I took my car out for a "spirited" ride down an old country road that follows a valley floor. The road would go from straights that would allow 100+mph, down to tight corners that would have tires screaching at 40mph. Anyway, about 75% of the way through the 42 minute trip from one side to the other, I started noticing that the car wouldn't let me down shift from 3rd to 2nd gear, using either the paddles or the gear selector, unless I was below 3700 rpm's. I wanted to see if anyone else has experienced this situation before, and if so, what did you do to fix it? My best guess... the transmission fluid may of been getting a little to hot! I was thinking a Stillen transmission cooler, but I rather hold onto the $300 if that wouldn't fix my problem... what's your $.02? __________________ Sports cars were not made to go straight!!!

08-31-2012, 01:42 AM	#2 (permalink)
wilsonp A True Z Fanatic Join Date: Jul 2010 Location: Virginia Posts: 1,134 Drives: 2009 Touring Sp Nav Rep Power: 17	What was your oil temp? That sounds more like the engine lowered the redline due to overheating - could you exceed 3700 otherwise? __________________ 2014 Cayman S PDK Sport Chrono White/Black Was 2009 370Z Touring Sport+Nav 7AT Metallic Black/Persimmon Was 1991 NSX Auto Black/Black

08-31-2012, 02:01 AM	#3 (permalink)
RR_Oso Base Member Join Date: Aug 2012 Location: Monterey Bay, CA Posts: 9 Drives: 09 Nissan 370Z Rep Power: 13	I don't remember what the oil temp was... I remember the gauge wasn't maxed out, but I'd have to go out and look at the gauge to get the approx temp... I remember the position of the needle... about 1 o'clock. Yes, I was able to carry the car up to redline. Once I coasted a little bit and got the rpm down, it would downshift, and then let me take it at far up to redline as i wanted before I shifted up. __________________ Sports cars were not made to go straight!!!

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08-31-2012, 07:36 PM	#4 (permalink)
Navyboy916 Enthusiast Member Join Date: Jul 2011 Location: Hawaii Posts: 434 Drives: 2010 370z 7AT Rep Power: 14	That means ur transmission oil is to hot and it's a fail safe for the engine. I had the same problem but I installed a transmission oil cooler and haven't had the problem again I recommend that to you as well

09-01-2012, 03:49 AM	#7 (permalink)
Navyboy916 Enthusiast Member Join Date: Jul 2011 Location: Hawaii Posts: 434 Drives: 2010 370z 7AT Rep Power: 14	Stillen and it's really simple to install