Since you slipped this into the end of a locked thread elsewhere, I'll pick it up here where it flows right into the conversation.
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Originally Posted by Blue370tt
You dont have the car I have....yes the base specs are the same.....but my tranny is tuned for FI and only a professional driver could even come close to shifting as fast as the 7AT in my car. Every car that has been on the dyno at Z1 that was 6MT, with the same TT, boost pressure, and similar mods, put down the same WHP or less than my car. So, how are they more effiecient at transferring power? And again, how are their shifts faster and more predictable.
You sound like you regret your choice in the tranny you have......I dont. My final point is, if you look at the 1/4 mile times posted on the forum and reported by the major car mags, the 7AT is faster EVERY TIME. Now take that and help me understand how your facts work????
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AT's aren't as efficient as MTs, you do have to just get over that basic fact. Solid gear engagement vs fluid drive, simple as that. Our AT's do have a lock-up mechanism, but it's not employed full time, it's conditional. The 7AT is known to be faster in the 1/4, that's true on most good cars really.
Shifting time has two factors to it: the reaction to the shift input, and the actual shift time. The actual shift time on the stock 7AT is reasonably good, but any half decent manual driver will beat it. Add in the reaction delay to the up/down-shift commands, and it's notably slower. Of course, you wouldn't realize any of this because, and I quote:
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I NEVER DRIVE MY 7AT IN MANUAL MODE.....ONLY D
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Those paddles are there for a reason, if you're not using them you're really not driving the car. D-mode doesn't ever downshift properly for corners (it can't, it's not psychic, regardless of your special tuning). If all you do is drag-race the car, frankly there are faster and cheaper options for drag-racing than a 370Z :P. Your opinion on the relative shifting speed and predictability are meaningless if you only ever drive in D.
I don't regret my choice on the 7AT, but you have to face up to the fact that it is an AT, and it does come with an AT's shortcomings.
Back to your special tuning, I wasn't even aware Osiris Tuner was capable of changing the line pressure, do you have more details on this? They're certainly not advertising the feature publicly. Did your tuner say anything about possibly reduced tranny life with the upgraded line pressure without valve body upgrades?