Question about the SRM

JeMo44 · 05-29-2013, 07:17 PM

I just got my Z this past saturday and I noticed that when I shift gears the rpm goes up from time to time or when I push the clutch in the clutch something somewhat similar happens. Is this normal? I have the SRM on.... Be easy on me guys, I'm new to this bad girl

iceman21_23 · 05-29-2013, 07:33 PM

SRM= Synchro rev matching basically blips the throttle and eliminates the need for heel toeing, its a feature that i find useful. it essentially blips the gas to match rpm's when shifting gears.

JeMo44 · 05-29-2013, 07:44 PM

So I shouldn't be worried about it rev up then, I know it does it when I down shift, but it just feels weird to me when I upshift, it also might be that the car only has 450 miles on it

iceman21_23 · 05-29-2013, 07:50 PM

its just matching the revs for a smoother shift, shouldn't be worried.

SS_Firehawk · 05-29-2013, 07:51 PM

It will do it on upshifts as well to smooth out the engagement.

Here is a bit of homework for you

2009 Nissan 370Z's SynchroRev Match Explained - Tech Dept. - Car Reviews - Car and Driver

JeMo44 · 05-29-2013, 07:54 PM

So it's ok for the clutch to feel a bit hard, its kind of difficult to explain what it feels like but I get the feeling like I have nothing to worry about.

Japanjay · 05-29-2013, 07:57 PM

That is why I hate it, I dont like the up control.

dP3NGU1N · 05-29-2013, 08:04 PM

You eventually get use to it.

gomer_110 · 05-29-2013, 08:05 PM

Quote:

Originally Posted by JeMo44

So it's ok for the clutch to feel a bit hard, its kind of difficult to explain what it feels like but I get the feeling like I have nothing to worry about.

The clutch in our cars is notorious for feeling strange compared to other cars but this is normal. You will get used to it.

Chuck33079 · 05-29-2013, 08:10 PM

You can make the clutch feel a little better if you reach up in there and remove the helper spring.

Haboob · 05-30-2013, 05:37 PM

Quote:

Originally Posted by Chuck33079

You can make the clutch feel a little better if you reach up in there and remove the helper spring.

This.

I did this and it was like night and day.

As for the SRM, yes... clutch in and it's still going to raise the RPM. Throwing it into neutral will do the same.

Almost got me in trouble once.

They say it doesn't do anything on up shifts, but it sure does hold the RPMs a bit on an upshift.

IDZRVIT · 05-31-2013, 10:06 AM

My SRM doesn't do anything when upshifting. I guess I just shift better than some of you guys.

theDreamer · 05-31-2013, 10:10 AM

Quote:

Originally Posted by IDZRVIT

My SRM doesn't do anything when upshifting. I guess I just shift better than some of you guys.

It will do something if you are slightly under the RPM range it has calculated for what it thinks you are going to do.
Remember if you are cruising in say 4th and go clutch in, the systems will know 2 things. You are either going up or down so it holds or slightly bumps the RPM to prepare itself. If you go down it can quickly rev up and if you shift up it drops them off.

IDZRVIT · 05-31-2013, 10:51 AM

Quote:

Originally Posted by theDreamer

It will do something if you are slightly under the RPM range it has calculated for what it thinks you are going to do.
Remember if you are cruising in say 4th and go clutch in, the systems will know 2 things. You are either going up or down so it holds or slightly bumps the RPM to prepare itself. If you go down it can quickly rev up and if you shift up it drops them off.

I don't pussy foot around when I shift so the shift is completed in say a 1/4 - 1/2 second. The computer doesn't have time to do anything because the the digital data its presuming, as you note, then collecting actual data, now has to be processed and then work the mechanics of the engine. That will take more than a 1/4 second to complete those steps because nothing in this world is instantaneous. So, if someone is slow to shift, then one might notice an increase in rpm as you and others have noted before the shift is completed but for me I just complete the shift and move on. If I had the time to prove this I would just video the tach on an upshift and see if it moves up i.e. several hundred rpm because thats what it takes to become "noticeable", but its not important enough to me to do so as I'm in the process of putting my retro fit roller motor back into my 'vette.

Maybe you or someone else could do this to prove the point? Be sure to complete shifts within say 1/2 second. Anything more is granny shifting.

theDreamer · 05-31-2013, 10:59 AM

Quote:

Originally Posted by IDZRVIT

I don't pussy foot around when I shift so the shift is completed in say a 1/4 - 1/2 second. The computer doesn't have time to do anything because the the digital data its presuming, as you note, then collecting actual data, now has to be processed and then work the mechanics of the engine. That will take more than a 1/4 second to complete those steps because nothing in this world is instantaneous. So, if someone is slow to shift, then one might notice an increase in rpm as you and others have noted before the shift is completed but for me I just complete the shift and move on. If I had the time to prove this I would just video the tach on an upshift and see if it moves up i.e. several hundred rpm because thats what it takes to become "noticeable", but its not important enough to me to do so as I'm in the process of putting my retro fit roller motor back into my 'vette.

Maybe you or someone else could do this to prove the point? Be sure to complete shifts within say 1/2 second. Anything more is granny shifting.

You do know electrons, which is the basis for computation, travel at a much faster rate of speed and are beating you in your shifts. What is probably happening with you is that on your upshifts you are above its 'increase' limit meaning it sees no reason to raise the RPM when you upshift. Different shifting style.

05-29-2013, 07:17 PM	#1 (permalink)
JeMo44 Base Member Join Date: May 2013 Location: So Cal Age: 34 Posts: 143 Drives: PW 13' 370Z 6MT Rep Power: 12	Question about the SRM I just got my Z this past saturday and I noticed that when I shift gears the rpm goes up from time to time or when I push the clutch in the clutch something somewhat similar happens. Is this normal? I have the SRM on.... Be easy on me guys, I'm new to this bad girl

05-29-2013, 07:33 PM	#2 (permalink)
iceman21_23 Track Member Join Date: Jan 2009 Location: league city, tx Posts: 757 Drives: 09' Solid Red 370z Rep Power: 17	SRM= Synchro rev matching basically blips the throttle and eliminates the need for heel toeing, its a feature that i find useful. it essentially blips the gas to match rpm's when shifting gears. __________________ Zele front bumper cf front lip, Seibon TS Hood, Work GS2, Ings+1 side skirts Takeda CAI Litespeed Exhaust

05-29-2013, 07:50 PM	#4 (permalink)
iceman21_23 Track Member Join Date: Jan 2009 Location: league city, tx Posts: 757 Drives: 09' Solid Red 370z Rep Power: 17	its just matching the revs for a smoother shift, shouldn't be worried. __________________ Zele front bumper cf front lip, Seibon TS Hood, Work GS2, Ings+1 side skirts Takeda CAI Litespeed Exhaust

05-29-2013, 07:51 PM	#5 (permalink)
SS_Firehawk Premium Member Join Date: Oct 2011 Location: Tampa Posts: 4,142 Drives: 13' Magma Red Nismo Rep Power: 7335	It will do it on upshifts as well to smooth out the engagement. Here is a bit of homework for you 2009 Nissan 370Z's SynchroRev Match Explained - Tech Dept. - Car Reviews - Car and Driver __________________ Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI New Car: Under Construction

05-29-2013, 08:04 PM	#8 (permalink)
dP3NGU1N A True Z Fanatic Join Date: Feb 2011 Location: Irvine Posts: 1,682 Drives: 13 PW sport 6mt Rep Power: 18	You eventually get use to it. __________________ 35% Hooper Optik \| Takeda Attack CAI \| F.I. HFC \| Hotchkis Sway Bar \| Stillen 24row \| OS Giken Super Lock LSD \| TK Shift Knob \| EVO-R Carbon Diffuser

05-29-2013, 07:44 PM	#3 (permalink)
JeMo44 Base Member Join Date: May 2013 Location: So Cal Age: 34 Posts: 143 Drives: PW 13' 370Z 6MT Rep Power: 12	So I shouldn't be worried about it rev up then, I know it does it when I down shift, but it just feels weird to me when I upshift, it also might be that the car only has 450 miles on it

05-29-2013, 07:54 PM	#6 (permalink)
JeMo44 Base Member Join Date: May 2013 Location: So Cal Age: 34 Posts: 143 Drives: PW 13' 370Z 6MT Rep Power: 12	So it's ok for the clutch to feel a bit hard, its kind of difficult to explain what it feels like but I get the feeling like I have nothing to worry about.

05-29-2013, 07:57 PM	#7 (permalink)
Japanjay Track Member Join Date: Mar 2012 Location: Puyallup Posts: 856 Drives: 09 Nissan 370z MB M6 Rep Power: 14	That is why I hate it, I dont like the up control.

05-29-2013, 08:10 PM	#10 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	You can make the clutch feel a little better if you reach up in there and remove the helper spring. DEpointfive0, luigi90210 and Haboob like this. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

05-31-2013, 10:06 AM	#12 (permalink)
IDZRVIT A True Z Fanatic Join Date: May 2009 Location: Halifax Posts: 1,659 Drives: '13 CTS-V, '76 Vette Rep Power: 27	My SRM doesn't do anything when upshifting. I guess I just shift better than some of you guys. __________________ "America.... still builds rockets!" Vette: 355 cid, 400 rwhp '13 CTS-V Coupe: 6.2L LSA, 556HP

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