how the rev matching feature of the 2007 5AT works?
06-02-2008, 10:40 AM
#1
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how the rev matching feature of the 2007 5AT works?
I am looking for a description of how the rev matching feature of the 2007 5AT works. I'm looking for a technical article or a "ya I have one and here's how it works" kind of description.
I've searched this forum and NissanUSA and car magazine sites. Everyone gives it a one word mention but nobody describes how it works.
My assumption is that since the Z has a throttle by wire system, the 5AT computer can set the throttle position to anything it wants to without the drivers right foot doing anything. So if you manually drop a gear in the 5AT in a 2007 model it simultaneously sets the throttle position to whatever rpm should maintain the same speed in the lower gear. ... Whereas doing the same gear change in a 2006 would end up doing an engine brake kind of thing (unless the driver matched the rpm with the throttle). Is that close to right?
Oh ya, if your response is anything like "rev-matching is for p&ssys who can't work a clutch and throttle pedal at the same time", I've read dozens of your responses already in the search archives. ... and congratulations on keeping the traffic high, you like to respond a lot!
I've searched this forum and NissanUSA and car magazine sites. Everyone gives it a one word mention but nobody describes how it works.
My assumption is that since the Z has a throttle by wire system, the 5AT computer can set the throttle position to anything it wants to without the drivers right foot doing anything. So if you manually drop a gear in the 5AT in a 2007 model it simultaneously sets the throttle position to whatever rpm should maintain the same speed in the lower gear. ... Whereas doing the same gear change in a 2006 would end up doing an engine brake kind of thing (unless the driver matched the rpm with the throttle). Is that close to right?
Oh ya, if your response is anything like "rev-matching is for p&ssys who can't work a clutch and throttle pedal at the same time", I've read dozens of your responses already in the search archives. ... and congratulations on keeping the traffic high, you like to respond a lot!
06-02-2008, 10:44 AM
#2
Dude, I don't think you need to rev match an auto. Wait.... Maybe I'm wrong but isn't an Auto Automatic? Rev Matching is for when your down shifting in a stick shift car. Not sure how that would work on an Auto..
Maybe someone can clue you in here but think about it...
Get ready...
Maybe someone can clue you in here but think about it...
Get ready...
Last edited by RedBullRR; 06-02-2008 at 10:46 AM.
06-02-2008, 11:25 AM
#3
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In a nutshell, if you place the transmission in manual-shift mode and select a downshift, the transmission's controller will automatically raise engine speed (rpm) to match wheel speed for the lower gear. The result is supposed to be a smooth and error free downshift. That is rev-matching. It doesn't work any differently than other cars that have a rev matching auto transmission.
Last edited by Z04; 06-02-2008 at 11:27 AM.
06-02-2008, 03:25 PM
#5
Originally Posted by Z04
In a nutshell, if you place the transmission in manual-shift mode and select a downshift, the transmission's controller will automatically raise engine speed (rpm) to match wheel speed for the lower gear. The result is supposed to be a smooth and error free downshift. That is rev-matching. It doesn't work any differently than other cars that have a rev matching auto transmission.
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