Why Did My Z, Keep Revving? Video.

semtex · 02-05-2010, 01:19 PM

Quote:

Originally Posted by ChrisSlicks

The SRM does nothing at all while you are waiting at a light. The SRM can only set the engine speed based on gear ratio, if vehicle speed or transmission speed is too low then SRM is disabled. e.g. If you are crawling along in 1st at 5 mph and then try to stick it in 6th SRM isn't going to try and match RPM's to 200 rpm and stall your car.

Okay, so I was right about automotive journalists being morons. Go figure, right?

On a more serious note though, I'm slightly confused about your last sentence about going from 1st to 6th. You say that SRM isn't going to try to match the RPMs to 200 rpm and stall your car. Well, doesn't that go without saying? SRM only blips on downshifts, not upshifts. Right? Or have we just uncovered yet another behavior of SRM that applies to some Zs and not others???

m4a1mustang · 02-05-2010, 01:20 PM

Quote:

Originally Posted by semtex

Okay, so I was right about automotive journalists being morons. Go figure, right?

On a more serious note though, I'm slightly confused about your last sentence about going from 1st to 6th. You say that SRM isn't going to try to match the RPMs to 200 rpm and stall your car. Well, doesn't that go without saying? SRM only blips on downshifts, not upshifts. Right? Or have we just uncovered yet another behavior of SRM that applies to some Zs and not others???

SRM will blip on an upshift if you take too long and let the revs drop too low for the next gear.

ChrisSlicks · 02-05-2010, 01:23 PM

Quote:

Originally Posted by semtex

Okay, so I was right about automotive journalists being morons. Go figure, right?

On a more serious note though, I'm slightly confused about your last sentence about going from 1st to 6th. You say that SRM isn't going to try to match the RPMs to 200 rpm and stall your car. Well, doesn't that go without saying? SRM only blips on downshifts, not upshifts. Right? Or have we just uncovered yet another behavior of SRM that applies to some Zs and not others???

SRM works on up-shifts as well. The term "blip" implies an increase in RPM and so you would only have that in a down-shift situation. On an up-shift the RPM's are held where they are and then lowered to match the target gear (negative blip).

Modshack · 02-05-2010, 01:50 PM

Meh...Whatever you guys find acceptable. I'm convinced mine is working perfectly as designed and described by Nissan. If you guys like all those blips and blurps with random stick movement that's great! If my car did that I'd turn the damn thing off....

semtex · 02-05-2010, 01:51 PM

Quote:

Originally Posted by m4a1mustang

SRM will blip on an upshift if you take too long and let the revs drop too low for the next gear.

This I've experienced.

Quote:

Originally Posted by ChrisSlicks

SRM works on up-shifts as well. The term "blip" implies an increase in RPM and so you would only have that in a down-shift situation. On an up-shift the RPM's are held where they are and then lowered to match the target gear (negative blip).

This I haven't. If anything, I think the rpms take too long to drop due to the heavy flywheel, making upshifts jerky if done too quickly. It would be nice if SRM would force the rpms down though, as that would mitigate my desire to buy a noisy lightweight flywheel. I put a JWT flywheel in my 350. I loved what it did to the performance in terms of taking away some of the 'rpm-float' during upshifts, but I hated the rattling noise it made.

m4a1mustang · 02-05-2010, 02:03 PM

Hmm, yeah, I can't say I've experienced it forcing the RPMs lower.

Modshack · 02-05-2010, 02:14 PM

Quote:

Originally Posted by m4a1mustang

Hmm, yeah, I can't say I've experienced it forcing the RPMs lower.

Obviously you don't shift at the speed of light...

ChrisSlicks · 02-05-2010, 02:29 PM

Quote:

Originally Posted by m4a1mustang

Hmm, yeah, I can't say I've experienced it forcing the RPMs lower.

Force is perhaps the wrong word, let's say it adjusts the RPM for the higher gear. It can't lower RPM's as quickly as it can raise them so it can overshoot a little on a quick shift.

02-05-2010, 01:50 PM	#4 (permalink)
Modshack A True Z Fanatic Join Date: Mar 2009 Location: Greenville NC Posts: 2,883 Drives: 370Z Sport Rep Power: 978	Meh...Whatever you guys find acceptable. I'm convinced mine is working perfectly as designed and described by Nissan. If you guys like all those blips and blurps with random stick movement that's great! If my car did that I'd turn the damn thing off.... __________________ Steal my car! (SOLD)...Now Porsche Cayman S Oil Cooler DIY: Here!

02-05-2010, 02:03 PM	#6 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6964	Hmm, yeah, I can't say I've experienced it forcing the RPMs lower. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

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