4.08 gears and SRM

jamesj1996 · 02-25-2015, 04:07 PM

ok guys so ive been hearing lots and lots of different things about 4.08 gears and losing SRM. many threads on here about losing SRM wth 4.08 gears. question number one.: by "losing SRM" does it mean when u downshift it wont blip the throttle for u or rpms will be a bit off? question two: does it really affect it at speeds around 80 mph or is it just continuous redline shifts?two people just told me that it didnt affect SRM ever for them....unless this one guy he hit 140 and the light came on but im almost never gonna hit 140 and dont plan on it with roads around here.. question 3: which would win in a race from a 40 roll with the same mods....a stock ratio or 4.08? im asking bc since we lose mph if theres 4.08 the stock z could be at 3rd gear at 5500 rpm we'll be in 4th gear already...therefore giving them the advantage or more power in lower gear.....

6MT-Z34 · 02-25-2015, 04:37 PM

SRM=SyncroRev Match...so if you lose SRM you will lose the ability for the computer to match revs

FPenvy · 02-25-2015, 04:39 PM

Quote:

Originally Posted by 6MT-Z34

SRM=SyncroRev Match...so if you loose SRM you will loose the ability for the computer to match revs

the SRM can get loose?

never heard of that before.

6MT-Z34 · 02-25-2015, 04:45 PM

Quote:

Originally Posted by FPenvy

the SRM can get loose?

never heard of that before.

yeah then you need to get a metal detector to find it

L33T Z34 · 02-25-2015, 10:34 PM

LuLz! Yes, the Z's ECU does loooooze what gear its in when u go to a lower Final Drive (FD). It usually happens when u rip thru the gears. It will come back though and stay if u drive like an old man. SRM will not work of coarse. Don't UPREV offer a table where u can select what FD u have installed on the Z so SRM works properly?

I would hope a 4.08 FD Z would whoop a 3.69 FD Z from a 40mph roll race if u both start out in 2nd. WTF would start out in 4th going 40mph!

MJB · 02-26-2015, 03:11 PM

I still keep in touch with the guy that bought my Z. He just text me the other day and told me he had the 4.08 FD installed. I asked about SRM and if any issues and he says it's still working perfectly. We are going to meet up next week so I'll get behind the wheel and see for myself.

Alex Kiesl · 02-26-2015, 06:02 PM

I have the 4.08 FD installed in my Z. SRM still works so you still have the "blip" when downshifting. BUT the SRM does not meet the rev perfectly so it's maybe 200 RPM lower than it'd be without the 4.08 FD. That's the only difference. It's simply not that super smooth and perfect anymore... but still close and you get used to it very quickly.
The other thing is that if you rev harsh into redline it MIGHT happen that the SRM gets deactivated and can't be turned on again until you restart your engine. But that does not happen very often... seldom... if ever.

Charles370 · 02-27-2015, 09:12 AM

I have 4.08 in my z and I never had a problem with SRM. And a z with 4.08 would definitely win a roll.

Alex Kiesl · 02-27-2015, 12:06 PM

For sure there is no problem with the SRM but of course it does not match the RPM as perfect as before. Known thing.

And yes, it's for sure worth every penny

. Much more aggressive!

During the 1.5 years I have the 4.08 installed it happened two times that it SRM was deactivated after hitting harsh into redline.

GSS138 · 04-01-2015, 02:52 PM

To follow up on this thread, I had the 4.08 gears installed last week, took my car to the race track Sunday and Saturday. I have found the following to be true:

1. Highrev downshifts, like when going into hard braking zones, will disable SRM.
2. Hitting the Rev limiter will disable SRM.
3. If you are just daily driving around town, then you should not have a problem.

If anyone has any info on UpRev fix/setting FD ratio, please chime in.

Optimiser · 04-02-2015, 08:46 AM

A fix from Uprev for this doesn't exist as yet (or will ever).

GSS138 · 04-02-2015, 04:40 PM

Quote:

Originally Posted by Optimiser

A fix from Uprev for this doesn't exist as yet (or will ever).

Too bad, either way I have already ordered those aluminum pedals with the side extender. I know how to heel-toe, but for some reason on this car my foot just can not agree with the pedal layout. Last weekend I was doing the brake/lift brake/stomp gas/maybe brake again shuffle all weekend lol.

abm89 · 04-02-2015, 06:14 PM

I'm finding out why people hate SRM on these. Mine is broken, and that was soon after my friend's failed on his car. No gears on either of the cars.

DEpointfive0 · 04-02-2015, 06:16 PM

Quote:

Originally Posted by abm89

I'm finding out why people hate SRM on these. Mine is broken, and that was soon after my friend's failed on his car. No gears on either of the cars.

Never heard of it going out without gears...

Maybe someone here can help you trouble shoot

02-25-2015, 04:07 PM	#1 (permalink)
jamesj1996 Enthusiast Member Join Date: Apr 2014 Location: new jersey Posts: 291 Drives: 2009 370z cp sport Rep Power: 11	4.08 gears and SRM ok guys so ive been hearing lots and lots of different things about 4.08 gears and losing SRM. many threads on here about losing SRM wth 4.08 gears. question number one.: by "losing SRM" does it mean when u downshift it wont blip the throttle for u or rpms will be a bit off? question two: does it really affect it at speeds around 80 mph or is it just continuous redline shifts?two people just told me that it didnt affect SRM ever for them....unless this one guy he hit 140 and the light came on but im almost never gonna hit 140 and dont plan on it with roads around here.. question 3: which would win in a race from a 40 roll with the same mods....a stock ratio or 4.08? im asking bc since we lose mph if theres 4.08 the stock z could be at 3rd gear at 5500 rpm we'll be in 4th gear already...therefore giving them the advantage or more power in lower gear.....

02-25-2015, 04:37 PM	#2 (permalink)
6MT-Z34 A True Z Fanatic Join Date: Jan 2013 Location: NJ Posts: 1,726 Drives: PW Z Rep Power: 15	SRM=SyncroRev Match...so if you lose SRM you will lose the ability for the computer to match revs Last edited by 6MT-Z34; 02-25-2015 at 04:45 PM.

02-26-2015, 03:11 PM	#6 (permalink)
MJB A True Z Fanatic Join Date: Aug 2011 Location: Tacoma, WA Age: 41 Posts: 1,498 Drives: a POS truck Rep Power: 496	I still keep in touch with the guy that bought my Z. He just text me the other day and told me he had the 4.08 FD installed. I asked about SRM and if any issues and he says it's still working perfectly. We are going to meet up next week so I'll get behind the wheel and see for myself. __________________ 09 Nismo #0483 sold. Viper or C7 next time around.

04-01-2015, 02:52 PM	#10 (permalink)
GSS138 Track Member Join Date: Mar 2013 Location: Mission Viejo, CA Posts: 769 Drives: '12 370Z 6M Sport Rep Power: 13	To follow up on this thread, I had the 4.08 gears installed last week, took my car to the race track Sunday and Saturday. I have found the following to be true: 1. Highrev downshifts, like when going into hard braking zones, will disable SRM. 2. Hitting the Rev limiter will disable SRM. 3. If you are just daily driving around town, then you should not have a problem. If anyone has any info on UpRev fix/setting FD ratio, please chime in. 6MT-Z34 likes this. __________________ Current Mods: Vorpal Weapon +5.

04-02-2015, 08:46 AM	#11 (permalink)
Optimiser Enthusiast Member Join Date: Mar 2013 Location: Australia Posts: 455 Drives: 2012 Nissan 370Z MT Rep Power: 20144	A fix from Uprev for this doesn't exist as yet (or will ever). GSS138 likes this.

02-25-2015, 10:34 PM	#5 (permalink)
L33T Z34 Banned Join Date: Jun 2010 Location: Ahnald, MO Age: 47 Posts: 387 Drives: 09 K51 G C Bw/S 6MT Rep Power: 0	LuLz! Yes, the Z's ECU does loooooze what gear its in when u go to a lower Final Drive (FD). It usually happens when u rip thru the gears. It will come back though and stay if u drive like an old man. SRM will not work of coarse. Don't UPREV offer a table where u can select what FD u have installed on the Z so SRM works properly? I would hope a 4.08 FD Z would whoop a 3.69 FD Z from a 40mph roll race if u both start out in 2nd. WTF would start out in 4th going 40mph!

02-26-2015, 06:02 PM	#7 (permalink)
Alex Kiesl Base Member Join Date: Jul 2011 Location: Stuttgart / Germany Posts: 18 Drives: Nissan 370Z Roadster Rep Power: 14	I have the 4.08 FD installed in my Z. SRM still works so you still have the "blip" when downshifting. BUT the SRM does not meet the rev perfectly so it's maybe 200 RPM lower than it'd be without the 4.08 FD. That's the only difference. It's simply not that super smooth and perfect anymore... but still close and you get used to it very quickly. The other thing is that if you rev harsh into redline it MIGHT happen that the SRM gets deactivated and can't be turned on again until you restart your engine. But that does not happen very often... seldom... if ever.

02-27-2015, 09:12 AM	#8 (permalink)
Charles370 Base Member Join Date: Oct 2013 Location: Long Island Posts: 30 Drives: 2010 370z sport Rep Power: 12	I have 4.08 in my z and I never had a problem with SRM. And a z with 4.08 would definitely win a roll.

02-27-2015, 12:06 PM	#9 (permalink)
Alex Kiesl Base Member Join Date: Jul 2011 Location: Stuttgart / Germany Posts: 18 Drives: Nissan 370Z Roadster Rep Power: 14	For sure there is no problem with the SRM but of course it does not match the RPM as perfect as before. Known thing. And yes, it's for sure worth every penny . Much more aggressive! During the 1.5 years I have the 4.08 installed it happened two times that it SRM was deactivated after hitting harsh into redline.

04-02-2015, 06:14 PM	#13 (permalink)
abm89 A True Z Fanatic Join Date: Feb 2013 Location: Austin, Texas Posts: 1,386 Drives: 11 370Z \| 24 EL450 Rep Power: 64763	I'm finding out why people hate SRM on these. Mine is broken, and that was soon after my friend's failed on his car. No gears on either of the cars. __________________ Complete Parts List: https://github.com/abm89/ztouge-build

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[WTB] SWAP SOCAL: 4.08 gears for 3.9 or 3.69 Gears	kosstick	Parts for sale (Private Classifieds)	26	09-24-2016 10:35 PM
4.36 gears	brucelidat	Engine & Drivetrain	34	06-22-2015 04:00 PM
4.08 gears and SRM	jamesj1996	Engine & Drivetrain	3	02-24-2015 08:00 PM
[FOR SALE] 4.08 Gears	joelio	Parts for sale (Private Classifieds)	9	05-22-2013 01:07 PM
4.08 gears	adam	Engine & Drivetrain	7	02-04-2013 03:48 PM