Engine overrun

[chuckodum]

After becoming accustomed to the way rpms drop instantly when getting off throttle, on a m/cycle, it is a bit aggravating to have to wait so long for the revs to drop on a car to make a perfectly synchronized shift. Aside from a lighter flywheel (and I wonder how much that would help this particular issue) are there any tricks to make the revs die when getting off of the throttle?

[BusyBadger]

Lightweight flywheel helps a lot in getting the rooms to drop. The OEM dual mass flywheel is close to 30 pounds, I run an Exedy ProLite that's just under 20 pounds, Jim Wolf Technology makes one that's in the 14 pound neighbourhood and Tilton used to make some crazy super lightweight flywheel, I think it was something like 9 pounds...almost undrivable as daily. Upgrading the flywheel is one of the best upgrades I've ever done for the Z.

As far as perfect rev-matching, best way to get it right is the same way you get to Carnegie Hall.

Welcome to NICO!

[chuckodum]

If getting to Carnegie is based on talent, I am confused. When the revs want to hover at 3-4000 rpm's for a full second after getting off the gas, what do you do? In my case I wait (forever). No wonder there are so many grinding gear complaints. The synchronizers are worn out from forced shifts. On my bike (1500 idle) I do not even close the throttle all of the way to get a fast and smooth shift, the revs drop that fast. Of course, we are talking two entirely different gearboxes, and bikes do not have to meet the same EPA standard that cars do. Does burning off gas already present in the intake have something to do with this? If there is no other way to clean up what is already in the intake, except to keep the engine revving long after the throttle has been closed (by the driver) then a zero weight flywheel would not help. I am sure this is not a Nissan issue only. May be why automatics are easier to pass EPA than manuals.

[BusyBadger]

If getting to Carnegie is based on talent, I am confused. When the revs want to hover at 3-4000 rpm's for a full second after getting off the gas, what do you do? In my case I wait (forever). No wonder there are so many grinding gear complaints. The synchronizers are worn out from forced shifts. On my bike (1500 idle) I do not even close the throttle all of the way to get a fast and smooth shift, the revs drop that fast. Of course, we are talking two entirely different gearboxes, and bikes do not have to meet the same EPA standard that cars do. Does burning off gas already present in the intake have something to do with this? If there is no other way to clean up what is already in the intake, except to keep the engine revving long after the throttle has been closed (by the driver) then a zero weight flywheel would not help. I am sure this is not a Nissan issue only. May be why automatics are easier to pass EPA than manuals.

The old joke was: How do you get to Carnegie Hall? And the answer is: Practice.

Anyway, I didn't see anywhere what year your Z was. The earlier ones suffered from gear grinds because of the synchros in the transmission. Once Nissan switched over to the CD009 transmission those issues really dropped. I posted up about this a long time ago, if you search with my name and keywords synchros or CD009 you'll find it.

I tend to wind my car out, clutch in, heel toe (blip if I'm lazy) and raise the tach 1-2K and down shift. I will admit that there is a small stutter that I did notice on the upshift, not so much anymore, when I came over from the 240SX. And like I said earlier, the lightweight flywheel really changed how it drove, it revs up quicker and revs drop quicker. Nissan used the dual mass flywheel as oem so it would be softer & easier for "normal" drivers. Would have been fine to do this to a G35, it was a crime on the Z though.