4.08 gears

Carbon · 08-09-2017, 10:06 PM

What are some honest opinions on these, do you actually feel a difference, is the top speed vs how much tq you gain worth it

jchammond · 08-10-2017, 12:40 AM

Quote:

Originally Posted by Carbon

What are some honest opinions on these, do you actually feel a difference, is the top speed vs how much tq you gain worth it

With you driving a 16' Nismo; You should already have the 3.92:1 rear axle ratio....
Not as big of a difference as a pre-15' w/3.69:1 gearing...just 1 gear ratio lower.
It would drop your 5th gear (1:1 ratio) by roughly just 6mph...vs 15/16mph for a Nismo going from 3.69:1---4.08:1.

crazy4oldcars · 08-10-2017, 07:14 AM

Gears don't make torque, they make speed. The 4.08 gears would change your 0-60 time (acceleration) by 4% vs the Nismo 3.92 ratio. They will also increase your RPM at any given gear and speed combination by 4%. For me, that would mean about 125 RPM higher at 75 mph in top gear.

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SouthArk370Z · 08-10-2017, 07:59 AM

Quote:

Originally Posted by crazy4oldcars

Gears don't make torque, ...

Correct. But gears do multiply torque.

jchammond · 08-10-2017, 08:07 AM

Gearing available-3.36,3.54,3.69,3.90(3.92),4.08 & 4.36:1...lower the gear (higher number) quicker the hole-shot & slower mph on top-end....+ more rpm's & could mean more gasoline burned.

solidus · 08-10-2017, 09:34 AM

I went from 3.36 with a 12' 7AT G37 to the 3.69 rear from a 6MT 370z. The difference was immediate and well worth the pumpkin swap. I also did a carbon PST driveshaft with the swap but the gearing was a night and day difference. The only hickup was that I lost cruise control but I never used it anyway. And yes the FD gear on any car is a torque multiplier. Torque gives accelleration , hp gives you speed.

Optimiser · 08-10-2017, 07:30 PM

Quote:

Originally Posted by Carbon

What are some honest opinions on these, do you actually feel a difference, is the top speed vs how much tq you gain worth it

Yes you will feel the difference!

chuckie311 · 08-10-2017, 10:37 PM

Honestly it's one of the best mods I have done.. the acceleration is night and day between them.. I wouldn't go back to stock gears

PongSanity · 08-10-2017, 10:54 PM

enjoyed them while I had it in. Accel was great

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Quicksilvers · 08-15-2017, 05:15 AM

I myself would not install 4.08 gears unless you go to the track a lot or your 370z is more of a weekend warrior. I would not install 4.08 gears if you 370z is any kind of a daily driver. Your mpg will suffer with 4.08 gears. In your case I would keep the 3.92 gears that came stock in your 370z Nismo.

Felix 808 · 08-15-2017, 11:55 AM

Quote:

Originally Posted by Quicksilvers

In your case I would keep the 3.92 gears that came stock in your 370z Nismo.

I see you have the manual, if you in fact have the 3.92 gears, I would not change a thing as 4% increase is not going to be worth it. If you are going to change gears (unless you are really fine tuning $$$$$) don't waste your time with anything less than a 10% change, you will not be happy. On the other side of that coin, you can go too far/ deep in your gearing. I would not go over 20% unless it's built for wheeling or the drag strip.

$.02 YMMV

Hotrodz · 08-15-2017, 01:34 PM

I would suggest keeping your current setup and spend the money on real LSD! This will improve traction, responsiveness and handling!

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Felix 808 · 08-15-2017, 05:14 PM

Quote:

Originally Posted by Hotrodz

I would suggest keeping your current setup and spend the money on real LSD! This will improve traction, responsiveness and handling!

and you usually do this & gears together

Also if you do do this, upgrade the bushings during the same.

jchammond · 08-15-2017, 05:31 PM

With all that being said; Going w/4.36's is gonna be your most noticeable change.
Your 5th gear will be reduced from approx.153mph down to 138mph. (calculated w/oem diameter rubber@redline.) 15mph.

jchammond · 08-15-2017, 06:15 PM

Quote:

Originally Posted by Carbon

What are some honest opinions on these, do you actually feel a difference, is the top speed vs how much tq you gain worth it

You could drop your tire series down from a 35 to a 30 (285/30/19) & that will give you the same gearing as 4.08's.
You would have to cut the front as well 40-35.
Cheaper than a gear-swap & potentially get you a set of track tires??

08-09-2017, 10:06 PM	#1 (permalink)
Carbon Base Member Join Date: Mar 2015 Location: Toronto, Canada Posts: 119 Drives: 2016 370z Nismo M6 Rep Power: 10	4.08 gears What are some honest opinions on these, do you actually feel a difference, is the top speed vs how much tq you gain worth it

08-10-2017, 07:14 AM	#3 (permalink)
crazy4oldcars Enthusiast Member Join Date: Aug 2016 Location: SE Texas Posts: 448 Drives: '16 Nismo Tech Rep Power: 28412	Gears don't make torque, they make speed. The 4.08 gears would change your 0-60 time (acceleration) by 4% vs the Nismo 3.92 ratio. They will also increase your RPM at any given gear and speed combination by 4%. For me, that would mean about 125 RPM higher at 75 mph in top gear. Sent from my XT1254 using Tapatalk /Angelo350Z/ and N1k0n like this.

08-10-2017, 08:07 AM	#5 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 57 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684394	Gearing available-3.36,3.54,3.69,3.90(3.92),4.08 & 4.36:1...lower the gear (higher number) quicker the hole-shot & slower mph on top-end....+ more rpm's & could mean more gasoline burned. __________________ MazWorx built long block \| FI-TT-100 Stage 2.75 \| IPT built 7A/T http://www.the370z.com/members-370z-...s-musings.html

08-10-2017, 09:34 AM	#6 (permalink)
solidus Track Member Join Date: Oct 2014 Location: Orlando, Florida Posts: 694 Drives: 15' Nismo Black 6MT Rep Power: 10080	I went from 3.36 with a 12' 7AT G37 to the 3.69 rear from a 6MT 370z. The difference was immediate and well worth the pumpkin swap. I also did a carbon PST driveshaft with the swap but the gearing was a night and day difference. The only hickup was that I lost cruise control but I never used it anyway. And yes the FD gear on any car is a torque multiplier. Torque gives accelleration , hp gives you speed. Felix 808 likes this.

08-10-2017, 10:37 PM	#8 (permalink)
chuckie311 Enthusiast Member Join Date: Jul 2012 Location: las vegas Posts: 313 Drives: Q50/G37 Rep Power: 12	Honestly it's one of the best mods I have done.. the acceleration is night and day between them.. I wouldn't go back to stock gears filip00 likes this. __________________ Tuned by (Seb@Specialty-Z) 2011 G37 Cam'd FBO 347whp 280wtq Corn Fed 4.08 Gears

08-10-2017, 10:54 PM	#9 (permalink)
PongSanity Enthusiast Member Join Date: Jul 2014 Location: Virgin Islands Posts: 261 Drives: '09 G37s KH3 6MT Rep Power: 10	enjoyed them while I had it in. Accel was great Sent from my SM-G950U using Tapatalk

08-15-2017, 05:15 AM	#10 (permalink)
Quicksilvers A True Z Fanatic Join Date: May 2017 Location: Atlanta, GA Posts: 2,039 Drives: 2017 370z Rep Power: 25463	I myself would not install 4.08 gears unless you go to the track a lot or your 370z is more of a weekend warrior. I would not install 4.08 gears if you 370z is any kind of a daily driver. Your mpg will suffer with 4.08 gears. In your case I would keep the 3.92 gears that came stock in your 370z Nismo. Last edited by Quicksilvers; 08-15-2017 at 05:17 AM.

08-15-2017, 01:34 PM	#12 (permalink)
Hotrodz Premium Member Join Date: Aug 2012 Location: NW, AZ Posts: 9,330 Drives: 10 Nissan 370z Nismo Rep Power: 2684384	I would suggest keeping your current setup and spend the money on real LSD! This will improve traction, responsiveness and handling! Sent from my SM-N910P using Tapatalk __________________ *Fast Intentions TT Installed and Tuned by Seb at SpecialtyZ 610whp 560tq:\|Fast Intentions 3" TT-TDX*\|SpecialtyZ/Fast Intentions 72 Row Oil Cooler\|SZ 6 Puck Clutch & Flywheel\|3GsCustoms\|Z1\|Wavetrac\|Hotchkis\|Whiteline \|Blitz\|Fortune Auto 500\|Fujimura\|SPL\|H&R\|TK\|TWM\|RPM Rollbar\|Sparco\|Next Level Performance\|TrackSpec\|AeroFlow Dynamics\|Pioneer\|

08-15-2017, 05:31 PM	#14 (permalink)
jchammond A True Z Fanatic Join Date: Nov 2014 Location: South Carolina Age: 57 Posts: 15,204 Drives: 13’ 370Z TS 7A/T Rep Power: 2684394	With all that being said; Going w/4.36's is gonna be your most noticeable change. Your 5th gear will be reduced from approx.153mph down to 138mph. (calculated w/oem diameter rubber@redline.) 15mph. __________________ MazWorx built long block \| FI-TT-100 Stage 2.75 \| IPT built 7A/T http://www.the370z.com/members-370z-...s-musings.html

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