7AT Valvebody upgrades?

NeedforZ · 12-23-2009, 09:57 AM

Ok, so does this mean that every shift will be super firm? I'm wondering how this would affect everyday driving. Hard shifts in the rain probably wouldn't be desirable.

terrycs · 12-23-2009, 08:36 PM

Quote:

Originally Posted by NeedforZ

Ok, so does this mean that every shift will be super firm? I'm wondering how this would affect everyday driving. Hard shifts in the rain probably wouldn't be desirable.

It will shift normally if the RPMs are low (driving around normally). Absolutely no problems driving in the rain, even with forced induction (unless the driver is being stupid).

However when you get on it and the RPMs are up, the line pressures in the transmission go up and the time in between shifts go down. It will feel like you are popping the clutch in an MT and you'll be easily chirping gears.

Additional clutch packs are only needed if the stock ones can't hold the power.

kannibul · 12-24-2009, 07:58 AM

Quote:

Originally Posted by terrycs

It will shift normally if the RPMs are low (driving around normally). Absolutely no problems driving in the rain, even with forced induction (unless the driver is being stupid).

However when you get on it and the RPMs are up, the line pressures in the transmission go up and the time in between shifts go down. It will feel like you are popping the clutch in an MT and you'll be easily chirping gears.

Additional clutch packs are only needed if the stock ones can't hold the power.

Clutchpacks are generally what go bad and cause for rebuild, aren't they?

I mean, they're the weakest link...valvebody helps keep the pressure up to the solenoids, but other than that, the weakest mechanical link to it all is the clutches AFAIK.

1slow370 · 12-24-2009, 03:39 PM

no it's usually the friction bands that go first. once you increase the fluid pressure there is more force on the bands and clutches so they are less likely to wear out from slipping.

CGMobile370Z · 12-24-2009, 10:07 PM

terrycs how is your 5AT holding up with the forced induction installed? Do you have any transmission upgrades?

12-24-2009, 10:07 PM	#5 (permalink)
CGMobile370Z Base Member Join Date: Sep 2009 Location: Miami, FL Posts: 144 Drives: 2009 Nissan 370Z Rep Power: 16	terrycs how is your 5AT holding up with the forced induction installed? Do you have any transmission upgrades? __________________ 370Z Touring/ Sports Package/ Stillen Gen3 Intake/ Stillen HFC/ NST Underdive Overdrive Pulleys/ FI Cat Back Exhaust/ Custom Headlights

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12-23-2009, 09:57 AM	#1 (permalink)
NeedforZ Base Member Join Date: Mar 2009 Location: DFW Texas Posts: 163 Drives: 370z Touring 7AT Rep Power: 17	Ok, so does this mean that every shift will be super firm? I'm wondering how this would affect everyday driving. Hard shifts in the rain probably wouldn't be desirable.

12-24-2009, 03:39 PM	#4 (permalink)
1slow370 A True Z Fanatic Join Date: Aug 2009 Location: In the D Posts: 3,732 Drives: v8 74 260z ;) Rep Power: 7251	no it's usually the friction bands that go first. once you increase the fluid pressure there is more force on the bands and clutches so they are less likely to wear out from slipping.