RPM jump when upshifting

hadokenuh · 03-21-2012, 11:11 PM

Hello guys,

I picked up a 2009 370z touring with Sport Package 6MT 2 weeks ago and am loving it. I came from a G37 sedan with the buggy 7AT so it has been a huge change. I am still pretty new to driving a manual so please bear with me.

Like the title says, when I try to upshift from 3-4, 4-5 or 5-6, when I engage the clutch and about the shift, I notice the engine RPM jumps up about 500-1000 rpm. So it goes like clutch in - shift 3 to neutral position - RPM jump - neutral position to 4 - clutch out - gas. Is this normal? Or am I doing anything wrong?

Thanks a bunch. Great forum by the way.

gpolak · 03-21-2012, 11:17 PM

Sometimes the ECU will rev the engine a bit for emissions control but a 1000 rpm jump when up shifting sounds weird. You're off the gas pedal when shifting right?

hadokenuh · 03-21-2012, 11:28 PM

Maybe not 1000rpm, more like 500rpm. But yeah I am off the gas pedal when shifting.

It doesn't do it all the time thought. It happens less when I shift faster. So should I shift faster? Or should I go to neutral, then wait a tiny bit, then shift to 4?

zguynate · 03-21-2012, 11:42 PM

It's synchro rev kicking in. It thinks you're about to downshift. Shift faster.

mantella87 · 03-21-2012, 11:48 PM

That happens to me when the car hasn't warmed up.

Srenity · 03-21-2012, 11:52 PM

Yeah, that happens to me on 4-5 shift only and it is becuase it thinks I am going down to 3 so the syncro rev match is kicking in. It does not happen a lot but does happen. I think it might have to do with how close you are to the gate of the downshift gear.

Z_ealot · 03-22-2012, 12:08 AM

im pretty sure thats the normal thing for syncro rev match to do guys cause it work on upshifts too not just downshifts. mine does this same thing also when i go to upshift, completely normal when you have syncro rev match on.

Nismo221 · 03-22-2012, 12:09 AM

I have had this happen will shifting from 4th to 5th and it is just the rev match. I guess the ECU thinks I'm trying to go to 3rd....

chops · 03-22-2012, 02:06 AM

this happens to me sometimes. in my experience its because im very, ever so slightly touching the gas as im clutching in.

try this, completely let off the gas a second before you even engage the clutch and then shift up. i doubt you'll get the RPM uprev. the gas pedal is pretty touchy on our cars

hadokenuh · 03-22-2012, 10:38 AM

Ok thanks a lot guys. Such a great forum

I'll try to let off the gas a sec before engaging the clutch and see if the rpm jumps.

anthonyy · 03-22-2012, 11:34 AM

Happens on 5-6 sometimes

osbornsm · 03-22-2012, 01:35 PM

Quote:

Originally Posted by dragonbreath

It's synchro rev kicking in. It thinks you're about to downshift. Shift faster.

I am very pleased with the Rev match... EXCEPT... i put the car into neutral a lot while driving (dont ask)... and every time i go to neutral i get a throttle blip.

I don't apply presure to the stick so it doens't know what gear i want, simply move to N and it blips. Stupid thing.

onzedge · 03-22-2012, 01:51 PM

Quote:

Originally Posted by osbornsm

I am very pleased with the Rev match... EXCEPT... i put the car into neutral a lot while driving (dont ask)... and every time i go to neutral i get a throttle blip.

I don't apply presure to the stick so it doens't know what gear i want, simply move to N and it blips. Stupid thing.

I have to ask -- why do you go into neutral so often?

vividracing · 03-22-2012, 01:59 PM

Quote:

Originally Posted by osbornsm

I am very pleased with the Rev match... EXCEPT... i put the car into neutral a lot while driving (dont ask)... and every time i go to neutral i get a throttle blip.

I don't apply presure to the stick so it doens't know what gear i want, simply move to N and it blips. Stupid thing.

Coasting in neutral isn't the safest thing you can do.

Drex · 03-22-2012, 02:00 PM

Quote:

Originally Posted by osbornsm

I am very pleased with the Rev match... EXCEPT... i put the car into neutral a lot while driving (dont ask)... and every time i go to neutral i get a throttle blip.

I don't apply presure to the stick so it doens't know what gear i want, simply move to N and it blips. Stupid thing.

push the stick towards 5/6 to avoid the blip

03-21-2012, 11:11 PM	#1 (permalink)
hadokenuh Base Member Join Date: Mar 2012 Location: Houston Posts: 186 Drives: 09 370Z 6MT Rep Power: 13	RPM jump when upshifting Hello guys, I picked up a 2009 370z touring with Sport Package 6MT 2 weeks ago and am loving it. I came from a G37 sedan with the buggy 7AT so it has been a huge change. I am still pretty new to driving a manual so please bear with me. Like the title says, when I try to upshift from 3-4, 4-5 or 5-6, when I engage the clutch and about the shift, I notice the engine RPM jumps up about 500-1000 rpm. So it goes like clutch in - shift 3 to neutral position - RPM jump - neutral position to 4 - clutch out - gas. Is this normal? Or am I doing anything wrong? Thanks a bunch. Great forum by the way.

03-21-2012, 11:42 PM	#4 (permalink)
zguynate A True Z Fanatic Join Date: Jan 2012 Location: Strangeland Posts: 1,053 Drives: 09 370z Rep Power: 73	It's synchro rev kicking in. It thinks you're about to downshift. Shift faster. __________________ 2009 370z touring w/sports package

03-22-2012, 12:09 AM	#8 (permalink)
Nismo221 Enthusiast Member Join Date: Sep 2010 Location: Decatur, Alabama Age: 35 Posts: 489 Drives: 2010 370z Nismo Rep Power: 14	I have had this happen will shifting from 4th to 5th and it is just the rev match. I guess the ECU thinks I'm trying to go to 3rd.... __________________ Stillen Gen 3, Motordyne M370 Intake Manifold, 25 row oil cooler, Z1 test pipes, Greddy Ti-C 70mm dual exhaust, 15mm front/20mm rear spacers, RE-11's, V1 detector, LED interior lights, LED tag lights, Password JDM CF engine and radiator cooling covers.

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03-21-2012, 11:17 PM	#2 (permalink)
gpolak Base Member Join Date: Dec 2010 Location: Boston Posts: 55 Drives: 2010 370Z T/SP 6MT Rep Power: 14	Sometimes the ECU will rev the engine a bit for emissions control but a 1000 rpm jump when up shifting sounds weird. You're off the gas pedal when shifting right?

03-21-2012, 11:28 PM	#3 (permalink)
hadokenuh Base Member Join Date: Mar 2012 Location: Houston Posts: 186 Drives: 09 370Z 6MT Rep Power: 13	Maybe not 1000rpm, more like 500rpm. But yeah I am off the gas pedal when shifting. It doesn't do it all the time thought. It happens less when I shift faster. So should I shift faster? Or should I go to neutral, then wait a tiny bit, then shift to 4?

03-21-2012, 11:48 PM	#5 (permalink)
mantella87 Track Member Join Date: Jun 2011 Location: Sacramento, CA Posts: 590 Drives: 2011 Z34 MT Rep Power: 14	That happens to me when the car hasn't warmed up.

03-21-2012, 11:52 PM	#6 (permalink)
Srenity Track Member Join Date: Mar 2009 Location: San Luis Obispo, CA Posts: 537 Drives: 40th Rep Power: 18	Yeah, that happens to me on 4-5 shift only and it is becuase it thinks I am going down to 3 so the syncro rev match is kicking in. It does not happen a lot but does happen. I think it might have to do with how close you are to the gate of the downshift gear.

03-22-2012, 12:08 AM	#7 (permalink)
Z_ealot A True Z Fanatic Join Date: Sep 2010 Location: Albuquerque, NM Posts: 2,044 Drives: 09 370Z Touring/Sprt Rep Power: 10090	im pretty sure thats the normal thing for syncro rev match to do guys cause it work on upshifts too not just downshifts. mine does this same thing also when i go to upshift, completely normal when you have syncro rev match on.

03-22-2012, 02:06 AM	#9 (permalink)
chops A True Z Fanatic Join Date: Oct 2010 Location: NA Posts: 1,732 Drives: NA Rep Power: 21	this happens to me sometimes. in my experience its because im very, ever so slightly touching the gas as im clutching in. try this, completely let off the gas a second before you even engage the clutch and then shift up. i doubt you'll get the RPM uprev. the gas pedal is pretty touchy on our cars

03-22-2012, 10:38 AM	#10 (permalink)
hadokenuh Base Member Join Date: Mar 2012 Location: Houston Posts: 186 Drives: 09 370Z 6MT Rep Power: 13	Ok thanks a lot guys. Such a great forum I'll try to let off the gas a sec before engaging the clutch and see if the rpm jumps.

03-22-2012, 11:34 AM	#11 (permalink)
anthonyy A True Z Fanatic Join Date: Apr 2011 Location: Los Gatos, CA Posts: 1,027 Drives: Lexus CT Rep Power: 16	Happens on 5-6 sometimes