2014 370z automatic transmission - manual mode

Limeybastard · 05-05-2014, 02:06 AM

Interesting thread so I am going to ask a dumb question also. What if scenario.. I am doing a steady 60mph and I then use the paddle down multiple times to go to first gear, will it over rev and do some damage?

DEpointfive0 · 05-05-2014, 02:15 AM

Quote:

Originally Posted by Limeybastard

Interesting thread so I am going to ask a dumb question also. What if scenario.. I am doing a steady 60mph and I then use the paddle down multiple times to go to first gear, will it over rev and do some damage?

No. It will not let you over rev, BUT when you get to the correct speed, it will let you downshift to the point where (for example) 1st gear runs to 7499 RPM.

SouthArk370Z · 05-05-2014, 01:01 PM

Quote:

Originally Posted by Limeybastard

Interesting thread so I am going to ask a dumb question also. What if scenario.. I am doing a steady 60mph and I then use the paddle down multiple times to go to first gear, will it over rev and do some damage?

As DE.50 pointed out, the TCM will not downshift if it would take you above red-line (or maybe just a hair above). As with the throttle*, you are flying-by-wire and don't have direct control. The car has a pretty strong self-preservation instinct. But that doesn't mean you should be depending on the limiter and bumping the red-line every time you downshift; it will eventually cause damage.

* Another "neat trick": press on the brake and the gas at the same time - the car will auto-magically limit the throttle until you let off the brake.

b15 · 05-05-2014, 02:43 PM

Quote:

Originally Posted by SouthArk370Z

* Another "neat trick": press on the brake and the gas at the same time - the car will auto-magically limit the throttle until you let off the brake.

Pretty sure it's not being limited by the ECU (as with launch control) but rather stays at that RPM because you've hit the torque converter stall speed (and stressing the trans).

wanker · 05-05-2014, 03:08 PM

Quote:

Originally Posted by b15

Pretty sure it's not being limited by the ECU (as with launch control) but rather stays at that RPM because you've hit the torque converter stall speed (and stressing the trans).

I'd bet it's a function of the brakeover ride safety feature governed by the ECU.

DEpointfive0 · 05-05-2014, 06:33 PM

Quote:

Originally Posted by b15

Pretty sure it's not being limited by the ECU (as with launch control) but rather stays at that RPM because you've hit the torque converter stall speed (and stressing the trans).

Quote:

Originally Posted by wanker

I'd bet it's a function of the brakeover ride safety feature governed by the ECU.

... Wanker... You are correct despite your user name

b15 · 05-05-2014, 08:18 PM

Quote:

Originally Posted by wanker

I'd bet it's a function of the brakeover ride safety feature governed by the ECU.

Quote:

Originally Posted by DEpointfive0

... Wanker... You are correct despite your user name

According to Nissans site it only activates when the vehicle is in motion beyond a certain speed.

Brake Override Technology | Nissan Innovation Labs

DEpointfive0 · 05-05-2014, 10:32 PM

Quote:

Originally Posted by b15

According to Nissans site it only activates when the vehicle is in motion beyond a certain speed.

Brake Override Technology | Nissan Innovation Labs

Hmmmmm... I think it's wrong to be honest. I can't, and I don't think anyone can do a brake stand without pulling the brake fuse because of this safety feature.

Limeybastard · 05-05-2014, 03:44 PM

Quote:

Originally Posted by SouthArk370Z

As DE.50 pointed out, the TCM will not downshift if it would take you above red-line (or maybe just a hair above). As with the throttle*, you are flying-by-wire and don't have direct control. The car has a pretty strong self-preservation instinct. But that doesn't mean you should be depending on the limiter and bumping the red-line every time you downshift; it will eventually cause damage.

* Another "neat trick": press on the brake and the gas at the same time - the car will auto-magically limit the throttle until you let off the brake.

Well thanks for explanation. Today I downshifted from 4th to 3rd and I heard a slight bang under from car tranny area. Wasn't loud just a low thunk.

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05-05-2014, 02:06 AM	#1 (permalink)
Limeybastard A True Z Fanatic Join Date: Apr 2014 Location: FL and London UK. Posts: 1,514 Drives: 2014 370Z Sport. Rep Power: 18	Interesting thread so I am going to ask a dumb question also. What if scenario.. I am doing a steady 60mph and I then use the paddle down multiple times to go to first gear, will it over rev and do some damage?