Slight RPM Rise?

Elan · 01-23-2014, 11:34 AM

So I've noticed something interesting when driving. Obviously while driving, you clutch in and the RPM drops. I let my car warm up until the RPM drops to 1000. I start driving and after clutching in to shift, the RPM actually rises 100-200rpm giving off an audible purr of the exhaust. That's what caught my attention. Foot off the gas, clutch in and RPM rise. It does this through every gear until the car warms up to normal operating temperatures. Anyone else experience this? Is it normal?

Also S-mode was off.

DIGItonium · 01-23-2014, 11:41 AM

Is yours UpRev tuned? Mine does that throttle blip when it's still cold on up shifts, and it goes away once it warms up.

Elan · 01-23-2014, 11:50 AM

It's not UpRev tuned. It's really any time I push the clutch in. Up or down. It's really not a big deal. Just wondering if it's normal. I was thinking something in the ECU acting finicky. I might try a reset. Strange that it goes away after it warms up.

kenchan · 01-23-2014, 11:55 AM

i think the ecu is just trying to burn off the gas based on ambient temp and humidity along with your last input parameters just before the shift. unless the rpm revs up on its own at a complete standstill (after water temp is at center of gauge) i think it's norma..

SouthArk370Z · 01-23-2014, 12:08 PM

I suspect that kenchan is correct. Does it happen when the clutch is partially disengaged or do you have to put the pedal all the way down for it to rev up?

Haboob · 01-23-2014, 12:17 PM

Mine does that with SRM on (rising when upshifting), always thought it was because of SRM... still do.

But with it off? That's a bit odd.

I'll have to try it on the way home today.

kenchan · 01-23-2014, 12:54 PM

Quote:

Originally Posted by SouthArk370Z

I suspect that kenchan is correct. Does it happen when the clutch is partially disengaged or do you have to put the pedal all the way down for it to rev up?

.. or it could be his titanium washers?

Elan · 01-23-2014, 03:27 PM

Quote:

Originally Posted by kenchan

.. or it could be his titanium washers?

Hey don't make me look bad! We sell a premium product!

Happens when clutch is depressed to the point that it catches or this case, disengages. It's just strange. S-mode does it I know but I even cycled S-mode to make sure I wasn't going crazy. First time owning the car in the super cold months. I will have to see how it behaves in warmer weather.

Luciano13 · 01-23-2014, 03:50 PM

Quote:

Originally Posted by Elan

It's not UpRev tuned. It's really any time I push the clutch in. Up or down. It's really not a big deal. Just wondering if it's normal. I was thinking something in the ECU acting finicky. I might try a reset. Strange that it goes away after it warms up.

So u upgraded your CAI and removed your entire muffler assembly with short tail pipes.....no tune

I think its time u UpRev the ecu

kenchan · 01-23-2014, 03:55 PM

Quote:

Originally Posted by Elan

Hey don't make me look bad! We sell a premium product!

Happens when clutch is depressed to the point that it catches or this case, disengages. It's just strange. S-mode does it I know but I even cycled S-mode to make sure I wasn't going crazy. First time owning the car in the super cold months. I will have to see how it behaves in warmer weather.

when you disengage the clutch, maybe roll off your throttle a split second earlier?

UNKNOWN_370 · 01-23-2014, 05:06 PM

Quote:

Originally Posted by kenchan

.. or it could be his titanium washers?

Who on earth would do that???

Elan · 01-24-2014, 01:42 AM

Quote:

Originally Posted by UNKNOWN_370

Who on earth would do that???

It's my business! We sell Carbon Fiber washers now as well!

Quote:

Originally Posted by kenchan

when you disengage the clutch, maybe roll off your throttle a split second earlier?

I thought so too so I put my foot on the floor and clutched. Still managed to do it. Maybe I'm just going insane!

Quote:

Originally Posted by Luciano13

So u upgraded your CAI and removed your entire muffler assembly with short tail pipes.....no tune

I think its time u UpRev the ecu

That may be my next mod actually! I am waiting to get some Z1 MAFs first!

01-23-2014, 11:34 AM	#1 (permalink)
Elan Track Member Join Date: May 2013 Location: Alpharetta, GA Posts: 906 Drives: Airplanes Rep Power: 15	Slight RPM Rise? So I've noticed something interesting when driving. Obviously while driving, you clutch in and the RPM drops. I let my car warm up until the RPM drops to 1000. I start driving and after clutching in to shift, the RPM actually rises 100-200rpm giving off an audible purr of the exhaust. That's what caught my attention. Foot off the gas, clutch in and RPM rise. It does this through every gear until the car warms up to normal operating temperatures. Anyone else experience this? Is it normal? Also S-mode was off. __________________ 2009 370Z NISMO #477 \| AAM Competition Short Tails \| AAM Competition HFCs \| K&N Typhoon CAI \| Kenwood DPX300U \| Rockford Fosgate PRIME R300-4 \| Rockford Fosgate Punch P165 \| Rockford Fosgate Punch P300-12 \| Polk Audio db1001 \| 15% Tints \| GTR Start Button \|

01-23-2014, 11:41 AM	#2 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	Is yours UpRev tuned? Mine does that throttle blip when it's still cold on up shifts, and it goes away once it warms up. __________________

01-23-2014, 11:50 AM	#3 (permalink)
Elan Track Member Join Date: May 2013 Location: Alpharetta, GA Posts: 906 Drives: Airplanes Rep Power: 15	It's not UpRev tuned. It's really any time I push the clutch in. Up or down. It's really not a big deal. Just wondering if it's normal. I was thinking something in the ECU acting finicky. I might try a reset. Strange that it goes away after it warms up. __________________ 2009 370Z NISMO #477 \| AAM Competition Short Tails \| AAM Competition HFCs \| K&N Typhoon CAI \| Kenwood DPX300U \| Rockford Fosgate PRIME R300-4 \| Rockford Fosgate Punch P165 \| Rockford Fosgate Punch P300-12 \| Polk Audio db1001 \| 15% Tints \| GTR Start Button \|

01-23-2014, 11:55 AM	#4 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141520	i think the ecu is just trying to burn off the gas based on ambient temp and humidity along with your last input parameters just before the shift. unless the rpm revs up on its own at a complete standstill (after water temp is at center of gauge) i think it's norma.. UNKNOWN_370 likes this.

01-23-2014, 12:08 PM	#5 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324197	I suspect that kenchan is correct. Does it happen when the clutch is partially disengaged or do you have to put the pedal all the way down for it to rev up? __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

01-23-2014, 12:17 PM	#6 (permalink)
Haboob A True Z Fanatic Join Date: Aug 2012 Location: Surface of the sun. Posts: 13,159 Drives: '18 GTI Autobahn DSG Rep Power: 1386	Mine does that with SRM on (rising when upshifting), always thought it was because of SRM... still do. But with it off? That's a bit odd. I'll have to try it on the way home today.

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