RPM Blip on Upshift?

NCSUPACK09 · 03-01-2010, 05:18 PM

Hey Guys,

Sorry if there is already a thread about this, but I searched the forums and couldn't find anything related to this...

So I was driving home from work today with the SRM turned off, accelerated pretty hard up to 4k in 2nd gear (still in the break-in period, so I wanted to have a little fun while staying within break-in guidelines), let off the gas and pushed in the clutch quickly and the RPMs blipped up to 4.5K - 4.7K before I shifted into 3rd. I thought maybe I had accidentally left my foot on the gas, but tried it again and the same thing happened.

Has anyone else experienced this?

vipor · 03-01-2010, 06:12 PM

I know there's a very small delay in the drive-by-wire (or whatever) system, so maybe it's just not "seeing" you lift off as early as you think.

Lord Kain · 03-01-2010, 06:19 PM

kenchan · 03-01-2010, 06:20 PM

you sure you werent in some toyata?

vipor · 03-01-2010, 06:22 PM

Quote:

Originally Posted by kenchan

you sure you werent in some toyata?

NCSUPACK09 · 03-01-2010, 06:35 PM

That is my guess, but I was just curious if others experienced this.

Daishi · 03-01-2010, 06:36 PM

Quote:

Originally Posted by kenchan

you sure you werent in some toyata?

lmao

m4a1mustang · 03-01-2010, 07:37 PM

Did they actually blip or did they just continue rising after you pressed the clutch? The flywheel in these cars is rather heavy so it's not uncommon for the revs to rise a bit between shifts because of the flywheel's momentum.

gumpy · 03-01-2010, 09:02 PM

Quote:

Originally Posted by m4a1mustang

Did they actually blip or did they just continue rising after you pressed the clutch? The flywheel in these cars is rather heavy so it's not uncommon for the revs to rise a bit between shifts because of the flywheel's momentum.

Mine does move a tad up when i put the clutch in, i figured it was flywheel momentum.

Lord Kain · 03-01-2010, 10:11 PM

For me it's all to do with the delay once I lift off the accelerator. My clutch foot is too fast for the car

vipor · 03-02-2010, 08:30 AM

Quote:

Originally Posted by Lord Kain

For me it's all to do with the delay once I lift off the accelerator. My clutch foot is too fast for the car

Remember you only need maybe 35% pedal depression to shift. I find myself being old school and flooring it from time to time.

Mike@Blackline · 04-04-2010, 09:11 AM

Quote:

Originally Posted by m4a1mustang

Did they actually blip or did they just continue rising after you pressed the clutch? The flywheel in these cars is rather heavy so it's not uncommon for the revs to rise a bit between shifts because of the flywheel's momentum.

same for 350Z
this is most likely it

NCSUPACK09 · 04-04-2010, 09:17 AM

It is the flywheel momentum...if you go WOT and then shift at say 5k, the flywheel momentum will carry the RPMs up another 500 or so, but if you take it to redline and the engine is winding out, you don't really get this effect.

marcussoori · 03-01-2010, 11:50 PM

The blip happens rarely during upshift on the AT transmission as well. I think there's a previous thread on this subject already...

vipor · 03-02-2010, 08:31 AM

Quote:

Originally Posted by marcussoori

The blip happens rarely during upshift on the AT transmission as well. I think there's a previous thread on this subject already...

That's intentional AFAIK. Kind of like SRM but for the AT.

03-01-2010, 05:18 PM	#1 (permalink)
NCSUPACK09 Enthusiast Member Join Date: Jan 2010 Location: Somewhere Posts: 407 Drives: '10 370Z MB 6MT SP Rep Power: 16	RPM Blip on Upshift? Hey Guys, Sorry if there is already a thread about this, but I searched the forums and couldn't find anything related to this... So I was driving home from work today with the SRM turned off, accelerated pretty hard up to 4k in 2nd gear (still in the break-in period, so I wanted to have a little fun while staying within break-in guidelines), let off the gas and pushed in the clutch quickly and the RPMs blipped up to 4.5K - 4.7K before I shifted into 3rd. I thought maybe I had accidentally left my foot on the gas, but tried it again and the same thing happened. Has anyone else experienced this? __________________ 2010 Base 370z Magnetic Black 6MT SP Mods: Bone Stock

03-01-2010, 06:12 PM	#2 (permalink)
vipor A True Z Fanatic Join Date: Aug 2009 Location: Euless, TX [ DFW ] Age: 42 Posts: 13,531 Drives: Nismo 09-0183 QAB Rep Power: 49	I know there's a very small delay in the drive-by-wire (or whatever) system, so maybe it's just not "seeing" you lift off as early as you think. __________________ 2009 NISMO # 0193 \| QAB \| Albums! \| 05.04.10 (Dynojet) 291.94hp/248.28tq Oil Cooler (DIY) \| Custom Headlights \| GTSPEC Braces \| F.I. Long Tube Headers

03-01-2010, 06:19 PM	#3 (permalink)
Lord Kain Base Member Join Date: Aug 2009 Location: Melbourne, Australia Posts: 112 Drives: 09' 370z Titanium MT Rep Power: 16	__________________ 15% Tint\| HiTech CBE \| Front & Rear Park Assist\| K&N Drop In's \| C.F. - B Pillers & Stage 2 Mirrors \| 19" Optional Nissan Rims

03-01-2010, 06:35 PM	#6 (permalink)
NCSUPACK09 Enthusiast Member Join Date: Jan 2010 Location: Somewhere Posts: 407 Drives: '10 370Z MB 6MT SP Rep Power: 16	That is my guess, but I was just curious if others experienced this. __________________ 2010 Base 370z Magnetic Black 6MT SP Mods: Bone Stock

03-01-2010, 07:37 PM	#8 (permalink)
m4a1mustang A True Z Fanatic Join Date: Feb 2009 Location: Northern VA Posts: 55,385 Drives: on two wheels Rep Power: 6963	Did they actually blip or did they just continue rising after you pressed the clutch? The flywheel in these cars is rather heavy so it's not uncommon for the revs to rise a bit between shifts because of the flywheel's momentum. __________________ - Steve Zs & Coffee - Saturdays at 10AM in Fairfax, VA and Columbia, MD (Click the banner!) LIKE us on Facebook!

03-01-2010, 06:20 PM	#4 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	you sure you werent in some toyata?

03-01-2010, 10:11 PM	#10 (permalink)
Lord Kain Base Member Join Date: Aug 2009 Location: Melbourne, Australia Posts: 112 Drives: 09' 370z Titanium MT Rep Power: 16	For me it's all to do with the delay once I lift off the accelerator. My clutch foot is too fast for the car __________________ 15% Tint\| HiTech CBE \| Front & Rear Park Assist\| K&N Drop In's \| C.F. - B Pillers & Stage 2 Mirrors \| 19" Optional Nissan Rims

04-04-2010, 09:17 AM	#13 (permalink)
NCSUPACK09 Enthusiast Member Join Date: Jan 2010 Location: Somewhere Posts: 407 Drives: '10 370Z MB 6MT SP Rep Power: 16	It is the flywheel momentum...if you go WOT and then shift at say 5k, the flywheel momentum will carry the RPMs up another 500 or so, but if you take it to redline and the engine is winding out, you don't really get this effect. __________________ 2010 Base 370z Magnetic Black 6MT SP Mods: Bone Stock

03-01-2010, 11:50 PM	#14 (permalink)
marcussoori Enthusiast Member Join Date: Mar 2009 Location: USA Posts: 468 Drives: 09 370Z Red AT Sport Rep Power: 17	The blip happens rarely during upshift on the AT transmission as well. I think there's a previous thread on this subject already... __________________ Stillen CBE & G3 LTIs, Motordyne M370, Berk HFCs, H&R 15/20mm spacers, CiNcity headlights, yellow OEM strut brace, Password: JDM CF engine bay parts, EVO-R CF front bumper parts, CF "Z" badge, VIS CF hood, Fujimura CF "diffuser", Show-N-Go plate frame, Katzkin red interior, interior CF, Pioneer BT-90 full system, Viper SmartStart

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