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

spearfish25 · 05-24-2009, 01:45 PM

The part about the revs falling is interesting. I've noticed that if I blip the throttle, the revs fall rather slowly. However, with SRM 'on' I've seen the revs fall very rapidly when upshifting. I don't know how to explain how the car can control its revs like this though...whether it's automatically modulating the clutch or has a way to engine brake and drop revs more quickly on command.

AK370Z · 05-24-2009, 02:52 PM

Quote:

Originally Posted by spearfish25

However, with SRM 'on' I've seen the revs fall very rapidly when upshifting. I don't know how to explain how the car can control its revs like this though..

Partially agree. With SRM on, RPM fall rapidly BUT stops at the optimum rpm for maybe about a second or two, then continues fall toward idle rpm if gas pedal is not pressed.

check out this video on how SRM upshifting works.
YouTube - synchr revmatch

I have been so busy lately, didn't get a chance to do a full SRM video (upshift and downshift).

spearfish25 · 05-24-2009, 09:25 PM

Quote:

Originally Posted by AK370Z

Partially agree. With SRM on, RPM fall rapidly BUT stops at the optimum rpm for maybe about a second or two, then continues fall toward idle rpm if gas pedal is not pressed.

Yeah, it's a nice little feature that it will hold it at the next gear's revs. I just noticed that it can drop to the 'hold' point faster when SRM is on than when I just watch it fall after an engine blip on my own.

miguez · 05-25-2009, 06:28 AM

Quote:

Originally Posted by spearfish25

The part about the revs falling is interesting. I've noticed that if I blip the throttle, the revs fall rather slowly. However, with SRM 'on' I've seen the revs fall very rapidly when upshifting. I don't know how to explain how the car can control its revs like this though...whether it's automatically modulating the clutch or has a way to engine brake and drop revs more quickly on command.

Quote:

Originally Posted by DIGItonium

When test driving the 7AT, I notice the revs holding before falling back to idle. I'm not sure if they purposely do that to smooth things in between shifts.

Which makes it even more interesting to see what will happen with a lighter flywheel. If indeed the engine ECU is the one delaying the RPM drop during gear shifts, and not the stock flywheel, we might not see the results one expects from a lighter flywheel. travisjb might be the first one to find out.

travisjb · 05-25-2009, 06:37 AM

Quote:

Originally Posted by miguez

Which makes it even more interesting to see what will happen with a lighter flywheel. If indeed the engine ECU is the one delaying the RPM drop during gear shifts, and not the stock flywheel, we might not see the results one expects from a lighter flywheel. travisjb might be the first one to find out.

I suspect the flywheel is the culpript not the ecu... no question our flywheel is heavy... and I struggle to think of why they would purposefully engineer-in a delayed rpm drop... but I could be wrong ! we'll find out soon

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05-24-2009, 01:45 PM	#1 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1857	The part about the revs falling is interesting. I've noticed that if I blip the throttle, the revs fall rather slowly. However, with SRM 'on' I've seen the revs fall very rapidly when upshifting. I don't know how to explain how the car can control its revs like this though...whether it's automatically modulating the clutch or has a way to engine brake and drop revs more quickly on command.