Shift light on an AT7?

phunk

OK.... question here to the 7AT guys from a 6MT guy...

instead of worrying about having to up-shift manually and timing with the delay etc.... why not just let the auto trans upshift itself? they dont actually shift any faster in "manual" mode anyway do they? Will someone manually shifting the 370z 7AT actually run down the 1/4 any quicker than the guy just in plain auto mode? i would figure not, and probably slower because hes not going to be able to time it as well.

i mean really, what are you trying to do? no offense, i mean i can understand downshifting the auto manually while coming into a turn or something... but when trying to full throttle accelerate.. what advantage is there to shifting it yourself?

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wstar

It's a valid question for drag racing, I guess. But to be honest, if my primary concern was drag racing, I wouldn't have bought a 370 (or a V6 car in general heh). There are probably some fine points to be debated even for straight line acceleration on a standing 1/4. For example, if you got too much wheelspin in first gear in regular D-mode, it might shift to second too early instead of allowing you to play the throttle and get it hooked up before shifting. Of course if you burned all of first gear you're screwed anyways, so meh. Technically there are some minor differences in how fully our torque convertor locks up and at which RPMs (between D-mode and M-mode), but they're minor. Also the car won't pick the same shift point you would. You might raise your rev limiter and be shifting higher than it would choose, or if you have a particularly flat torque curve you might even be shifting back at 7K.

But mostly people who are doing anything serious in a 370Z aren't drag racing, so yeah, we do want to control both the down- and up- shift to keep the revs in the right range, which a full-auto can never do correctly without driver input.

Because 1st gear on the 7AT goes by so fast at full throttle (it's actually even lower geared than the 6MT's first gear, even after the different final drives are taken into account), I have used D-mode for the 1-2 shift from a standing start before. The idea is start in D, floor it, let it shift to 2nd for you, and then flip back over to the paddles to take over and continue driving (e.g. the starting line of an SCCA course).

You can really only do that reliably at a standing start though. Once you're into a course and shifting on your own, there's never really a good time when it would make sense to move back to D, even temporarily. If you did and you were at any less than full throttle, the car would take over with "regular commuter traffic" shifting rules and drop you into too high of a gear for whatever you're doing, and then it gets to be a pain in the *** to switch back and get it back to the gear you should be in.

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Dark Sarcasm

when im under full throttle in my AT, the trans shifts WAY faster in manual mode. My 7AT will go from 1st to 2nd faster than I could shift it was a manual. Barking the rear tires, under full throttle, in manual mode is not unusual. There is a slight, 1/2 second delay from the time I hit the paddle till the shift. Its the same at higher
gears on the highway, the upshifts are very quick in manual mode.

My brother in-law has an 05 Vette with paddle shifters. I drove it when he first got it. He explained the paddle shifters are more for holding it in gears around corners, not really for fast upshifts. The Z trans is different. He drove mine and couldnt believe how fast it changes gears in manual mode.

This isnt a manny vs. auto thread, but for you MT guys out there that havent driven the paddle shifters yet, I highly suggest you try them out. It may not be what you want for your own Z but I think you will be impressed with the 7AT performance.

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wax

SonnyC

Hey Guard Dog, if Pro Shop has a factory light on his 11 7at it must be available through Nissan parts dept. There are no significant changes in the 370 since inception to my knowledge so it must be driven off of something already on the car or easily adapted with an update? I would check with your dealer tomorrow. I could see where it would be nice on a twisty mountain road when you are engine braking and accelerating. I got an AT because I live in a city full of traffic jambs and pumping a clutch to move 10 feet at a time gets old fast. From my experience, the 7AT in manual mode is about as close to a MT as you can get. It is a very responsive transmission. Good luck.

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ChrisSlicks

Given that all cars have the same dash (auto or manual) then the light is there, it is just a matter of whether or not the ECU turns it on.

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Guard Dad

I agree that it sounds like a software issue.

At the moment I'm trending toward an aftermarket light (if available) because they are easily adjustable and can be located where it best suits my needs. Unfortunately I'm not sure that I've found any yet that will work on our car.

I can understand that the MT6 guys don't seem to understand why we want this stuff. After all, the AT7 is a bit of an odd beast; ultra short first and second gears, paddle shifters, full manual control of up shifts, near full control of downshifts, an early-lock up torque converter plus full automatic operation that holds the tranny in a lower gear during hard cornering, you kind of need to spend some time with the AT7 to get an understanding of exactly what it has to offer. When shopping for my Z I only drove the AT7 so I could buy an MT6 with a clear conscience. I ended up with the AT7 even though it cost more. My last two personal cars were both MT6's, a hardcore SLP equipped 99 Camaro SS and an 04 GTO. I was surprised as anyone when I went for the AT7 in my Z.

SonnyC

F1, most sports prototypes including Audi and Peugeot, AMG MB's and the GTR all use automatics. I have had MT's all my life and got my first sports car with an AT when I bought a used SL55 AMG a few years ago. I wouldn't even consider a manual again.

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ChrisSlicks

If you are into drag racing I would look at a multi-stage shift light, this way you can program a lower RPM for the first light to account for shift delay. Something like the Auto-Meter level 2 would work.

The guys at A&M have a nice one on their race car but I think it is part of their race computer telemetry system.

I see a few guys on track with this one - pricy.
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cossie1600

Did you really compare your automatic with a converter to the racing transmission in F1 cars?