Nissan 370Z Touring: Brakes and Blips and Revs, Oh My!

ChrisSlicks · 05-26-2009, 07:25 AM

Alright, I figured it out.

Aside from the sensor for each gate, there is a sensor in the center of each neutral position. If you take it out of gear straight up or down to the neutral position directly above or below the gate then the revs will hold where they are or fall slightly. If you move it from that neutral position to a neutral position further left then it will blip.

The easiest way to test it is to drive in 5th at a steady speed of 45-60 and drop it down to neutral above the various gates. If you drop it to neutral and let go, the spring will center it above 4th so the engine blips in anticipation. If you push it to the left the engine really blips thinking that you might stick it in 2nd. If you drop it out of gear but hold it to the right the engine doesn't blip at all.

miguez · 05-26-2009, 03:52 PM

Fascinating, and interesting solution to this problem. Thanks for finding out Chris!

ChrisSlicks · 05-26-2009, 04:16 PM

One more annoying thing I experimented with a little is the reluctance of the rpms to drop when up shifting, for this test I had SRM disabled.

I found that the rpms will only drop quickly if you are 100% off the throttle before you touch the clutch, during normal driving you wouldn't do that as it makes for more jerky behavior. This could be attributed partially to the electronic throttle not sensing the load change quickly enough, compounded by the heavy flywheel.

miguez · 05-26-2009, 04:19 PM

Sounds right on to me, electronic throttle + heavy flywheel. I can't WAIT for travis' flywheel impressions!

Modshack · 05-26-2009, 04:38 PM

Quote:

Originally Posted by ChrisSlicks

One more annoying thing I experimented with a little is the reluctance of the rpms to drop when up shifting, for this test I had SRM disabled.

I found that the rpms will only drop quickly if you are 100% off the throttle before you touch the clutch, during normal driving you wouldn't do that as it makes for more jerky behavior. This could be attributed partially to the electronic throttle not sensing the load change quickly enough, compounded by the heavy flywheel.

There may be an additional factor at work here...If you read the VVEL expose over on the other forum (Posted today) it states that the throttle plate kind of plays second fiddle to the Cam actuation in determining some engine speed settings...

http://www.the370z.com/nissan-370z-g...potantial.html

ChrisSlicks · 05-26-2009, 04:42 PM

Quote:

Originally Posted by Modshack

There may be an additional factor at work here...If you read the VVEL expose over on the other forum (Posted today) it states that the throttle plate kind of plays second fiddle to the Cam actuation in determining some engine speed settings...

Yes I read that one. It doesn't really matter what the throttle is controlling as long as whatever it is controlling reacts quickly. Given that the VVEL and throttle plate are both computer controlled this is potentially something that can be addressed by a software update (if Nissan determines it is a problem).

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05-26-2009, 07:25 AM	#31 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 654	Alright, I figured it out. Aside from the sensor for each gate, there is a sensor in the center of each neutral position. If you take it out of gear straight up or down to the neutral position directly above or below the gate then the revs will hold where they are or fall slightly. If you move it from that neutral position to a neutral position further left then it will blip. The easiest way to test it is to drive in 5th at a steady speed of 45-60 and drop it down to neutral above the various gates. If you drop it to neutral and let go, the spring will center it above 4th so the engine blips in anticipation. If you push it to the left the engine really blips thinking that you might stick it in 2nd. If you drop it out of gear but hold it to the right the engine doesn't blip at all.

05-26-2009, 03:52 PM	#32 (permalink)
miguez Enthusiast Member Join Date: Apr 2009 Location: Columbus, Ohio Posts: 359 Drives: '04 Cavalier Rep Power: 182	Fascinating, and interesting solution to this problem. Thanks for finding out Chris!

05-26-2009, 04:16 PM	#33 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 654	One more annoying thing I experimented with a little is the reluctance of the rpms to drop when up shifting, for this test I had SRM disabled. I found that the rpms will only drop quickly if you are 100% off the throttle before you touch the clutch, during normal driving you wouldn't do that as it makes for more jerky behavior. This could be attributed partially to the electronic throttle not sensing the load change quickly enough, compounded by the heavy flywheel.

05-26-2009, 04:19 PM	#34 (permalink)
miguez Enthusiast Member Join Date: Apr 2009 Location: Columbus, Ohio Posts: 359 Drives: '04 Cavalier Rep Power: 182	Sounds right on to me, electronic throttle + heavy flywheel. I can't WAIT for travis' flywheel impressions!