**** 4.083 Gears/Final Drive Installed**** - MY350Z.COM Forums



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Old 09-14-2007, 12:11 PM   #1
ACEMAN
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Exclamation **** 4.083 Gears/Final Drive Installed****

Let me first say.... This is by far the BEST mod i have done to my NA car...

You turbo guys will understand ( remember the chills that went up your back when you first drove your FI car?? ) Thats me

First, 2nd and third gears are amazing. The car pulls sooo much harder now. I cant wait to get it to the track rental next friday. I have my ECU reflashed to the 7200 Rpm Redline.

Here is a break down of the STOCK gear ratio's

1st Gear Ratio: 3.794:1
2nd Gear Ratio: 2.324:1
3rd Gear Ratio: 1.624:1
4th Gear Ratio: 1.271:1
5th Gear Ratio: 1.000:1
6th Gear Ratio: 0.794:1
-Reverse Ratio: 3.446:1

This is calculated using 255/45/17 Tires

http://www.f-body.org/gears/

STOCK 3.357 Gear-- ECU REFLASH 3.357 ---HR Engine
6600 Rpm Redline --------7200 Rpm Redline----------7500 Rpm Redline

First------40mph ------First-----44mph-----------First-----46mph
Second ----66mph ------Second----71mph-----------Second----74mph
Third------94mph-------Third----102mph-----------Third----107mph
Forth-----120mph-------Forth----131mph-----------Forth----136mph
Fith------152mph-------Fith-----166mph-----------Fith-----173mph
Sixth-----192mph-------Sixth----209mph-----------Sixth----218mph

STOCK 3.538 Gear-- ECU REFLASH 3.538 ---HR Engine
6600 Rpm Redline -------7200 Rpm Redline-----------7500 Rpm Redline

First -----38mph ------First-----42mph-----------First-----43mph
Second ----62mph-------Second----68mph-----------Second----71mph
Third -----89mph-------Third ----97mph-----------Third----101mph
Forth ----114mph-------Forth----124mph-----------Forth----129mph
Fith -----144mph-------Fith-----158mph-----------Fith-----164mph
Sixth ----182mph-------Sixth----199mph-----------Sixth----207mph

No Reflash 3.7 Gear-- ECU REFLASH 3.7 ----HR Engine
6600 Rpm Redline ---------7200 Rpm Redline---------7500 Rpm Redline

First -----36mph-------First ----40mph-----------First-----41mph
Second ----59mph-------Second----65mph-----------Second----68mph
Third -----85mph-------Third ----93mph-----------Third-----97mph
Forth ----109mph-------Forth----119mph-----------Forth----124mph
Fith------138mph-------Fith-----151mph-----------Fith-----157mph
Sixth-----174mph-------Sixth----190mph-----------Sixth----198mph


No Reflash 3.9 Gear -- ECU REFLAH 3.9-----HR Engine
6600 Rpm Redline ----------7200 Rpm Redline-------7500 Rpm Redline

First ------35mph-------First ---38mph-----------First-----39mph
Second -----56mph-------Second---62mph-----------Second----64mph
Third ------81mph-------Third----88mph-----------Third-----92mph
Forth------103mph-------Forth---113mph-----------Forth----117mph
Fith-------131mph-------Fith----143mph-----------Fith-----149mph
Sixth------165mph-------Sixth---180mph-----------Sixth----188mph


No Reflash 4.083 Gear-- ECU REFLASH 4.083--HR Engine
6600 Rpm Redline ------------7200 Rpm Redline---------7500 Rpm Redline

First ------33mph--------First ---36mph----------First-----38mph
Second -----54mph--------Second---59mph----------Second----61mph
Third ------77mph--------Third ---84mph----------Third-----88mph
Forth ------99mph--------Forth---107mph----------Forth----112mph
Fith ------125mph--------Fith----137mph----------Fith-----142mph
Sixth -----158mph--------Sixth---172mph----------Sixth----179mph

Here are the track results

Vid

http://www.youtube.com/watch?v=S8ZTsAgCabw

Link to thread

https://my350z.com/forum/drag/307682-new-best-13-064-105-5-all-motor.html



Before and after the 4.083 gears
Attached Thumbnails
**** 4.083 Gears/Final Drive Installed****-dsc02767.jpg   **** 4.083 Gears/Final Drive Installed****-after.jpg   **** 4.083 Gears/Final Drive Installed****-after2.jpg   **** 4.083 Gears/Final Drive Installed****-13.06.jpg  

Last edited by ACEMAN; 10-13-2007 at 12:52 PM.
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Old 09-14-2007, 12:20 PM   #2
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Thumbs up

10-08-07

Update on the Gears..

Put over 200 highway miles on the car this past weekend and was able to average 29 mile to the gallon. Not bad at all. I would of thought the 4.083 gears would have really killed my gas tank.

Also, driving around town I am able to average around 22mpg. If I drive it like i stole it, then its around 18mpg.


10-13-07

Updated the Main post with my new time from the track.. Ran a personal best of [email protected]

These gears are proving to be a nice addition.

Here is the link to the thread.

https://my350z.com/forum/showthread.php?t=307682

11-30-07

_JB's review on the 4.083 gears

https://my350z.com/forum/showthread....=1#post4758726

Alberto's review of the 3.3 gears with Forced induction

https://my350z.com/forum/showthread....ighlight=gears

Justin's review of the 3.9 gears in a 07 350z

https://my350z.com/forum/showthread....ighlight=gears

12-04-07

List of all Nissan gear ratios for each model.

http://www.nicoclub.com/Greg/ratios.html

The 4.083 gear comes out of a

Nissan Frontier
2005-2007 King Cab M/T 2.5L
C200
4.083


02-04-08

Frostydc4's review

350EVO 3.9 Final Drive Installed on my 5AT: Impressions

https://my350z.com/forum/engine-and-drivetrain/332994-350evo-3-9-final-drive-installed-on-my-5at-impressions.html


05-20-08

13SECZ's review of the 4.083 gears

https://my350z.com/forum/showthread....81#post5764381

06-02-08

L. Baggins Review of the 4.083 gears

https://my350z.com/forum/engine-and-drivetrain/362588-my-review-of-the-4-083-final-drive-gears.html

Later
Todd

Last edited by ACEMAN; 06-02-2008 at 05:34 PM.
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Old 09-14-2007, 12:36 PM   #3
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Quote:
Originally Posted by aceman
We should add the 07 stuff to this thread aswell


Todd
Sure can:

Stock 3.538, 7500 rpm shifts:
1st............... 44mph
2nd.............. 72mph
3rd............... 103mph
4th............... 132mph
5th............... 168mph
6th............... 211mph

4.083 gears, 7500 rpm shifts:
1st............... 38mph
2nd.............. 62mph
3rd............... 89mph
4th............... 114mph
5th............... 145mph
6th............... 183mph


I was the first 07 with 4.083 gears and recommended them to aceman when he asked me about them. As far as the 07 perspective... if you are n/a it really LOVES this gearing, especially with the new redline. 1st through 4th pull so much friggin' harder.

Instead of shifting to 4th almost the instant I cross the finish line in the 1/4, I'm shifting into 4th right at or instantly after the 1/8th now (I only made one pass, it wasn't an impressive time since I left the line from almost idle due to clutch issues).
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Old 09-14-2007, 01:19 PM   #4
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wow, i've always wanted to do this swap but figure it's best to wait til i get an LSD. gimme a ride in that beast man!
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Old 09-14-2007, 01:27 PM   #5
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i know that the 3.9 adds 10% more power to every gear, how does this add up? i almost did this, but when f/i instead so im keepin the stock 3.5's
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Old 09-14-2007, 01:43 PM   #6
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yes please explain a little more on this, In a NA form does this peform better then the 3.9 gears . Also where would u obtain this mod what vendor. Im very itnrested in getting some proper gears for my revup to enjoy the 7k revlimit a little more.

Last edited by RBlover69; 09-14-2007 at 01:46 PM.
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Old 09-14-2007, 01:44 PM   #7
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Hey Todd, how much was the total cost (FD gears and installation)?
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Old 09-14-2007, 01:48 PM   #8
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AWSOME
i want it haha, but is it safe to have the ecu up the rev to 7200? can we see dyno sheets that theres still power gain up to that rpm?
oh and yea post how much it all was
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Old 09-14-2007, 02:00 PM   #9
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Quote:
Originally Posted by aceman
With the new gears i should finish the 1/4 right at the top of forth gear... I hope i dont have to shift at the last second.
Nice mod for drag racing. If you are at redline before the finish line, you may want to backoff the throttle instead if shifting.

Last edited by davidv; 09-14-2007 at 02:07 PM.
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Old 09-14-2007, 02:04 PM   #10
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Quote:
Originally Posted by davidv
Nice mod for drag racing. If you at redline before the finish line, you may want to backoff the throttle instead if shifting.
what about road racing, whats your thought on that. Im thinking for turns where u need accelaration it may play a nice role. I was underneath the impression that the 3.9 gears where the best overall. Never herd of these final drive gears.
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Old 09-14-2007, 02:04 PM   #11
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Nice mod. I really want to do this as well. I wonder if it's worth it though. I have a few questions and maybe you can help.

1. Does it just feel like it pulls harder or will you actually gain something noticable in the 1/4?

2. Do you lose any low end tq or does it feel like you gained?

3. Any drawbacks you see with this so far?

4. How much did you just get the final drive by itself without install?

5. Is your traction worse?

Thanks.
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Old 09-14-2007, 02:06 PM   #12
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Quote:
Originally Posted by RBlover69
yes please explain a little more on this, In a NA form does this peform better then the 3.9 gears .
Its primarily a drag racing mod. Racers want to cross the finish line at the top of some gear. If you cut it too close, you end up at redline before the finish line necessitating another shift.

Someone correct me if I am wrong.
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Old 09-14-2007, 02:06 PM   #13
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Quote:
Originally Posted by dutchboy350Z
Hey Todd, how much was the total cost (FD gears and installation)?
The gears are $430.00 ( ring and pinion ) I ended up paying $150 for the install ( Im sure you know the story )

Todd
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Old 09-14-2007, 02:09 PM   #14
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Default Here you go

Nice mod. I really want to do this as well. I wonder if it's worth it though. I have a few questions and maybe you can help.

1. Does it just feel like it pulls harder or will you actually gain something noticable in the 1/4? Yes it pulls alot harder

2. Do you lose any low end tq or does it feel like you gained? Feels like i gained more Tq

3. Any drawbacks you see with this so far? Nope, whole new car again.. Love it.

4. How much did you just get the final drive by itself without install? $430.00

5. Is your traction worse? Yes, traction is alot worse. If you are rolling in first and stomp on it, tires are roasting.

Thanks.
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Old 09-14-2007, 02:11 PM   #15
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Quote:
Originally Posted by davidv
Its primarily a drag racing mod. Racers want to cross the finish line at the top of some gear. If you cut it too close, you end up at redline before the finish line necessitating another shift.

Someone correct me if I am wrong.
That is one of the reasons..

The other reason is to take better advantage of your powerband.

Todd
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Old 09-14-2007, 02:11 PM   #16
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Quote:
Originally Posted by aceman
The gears are $430.00 ( ring and pinion ) I ended up paying $150 for the install ( Im sure you know the story )

Todd
Well I wouldn't say it was worth the wait, but $150 .... that's a very reasonable price.
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Old 09-14-2007, 02:12 PM   #17
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Thanks for the response. You seem pretty happy/excited. I guess i will be spending more money until christmas yet again.
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Old 09-14-2007, 02:13 PM   #18
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so for something like road racing the 3.9 is better off is what teh consensous is. (spelling on a PDA lol)
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Old 09-14-2007, 02:14 PM   #19
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Quote:
Originally Posted by SuperBlack350
Thanks for the response. You seem pretty happy/excited. I guess i will be spending more money until christmas yet again.
I will be happier when i improve my time at the track.

Next friday

Todd
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Old 09-14-2007, 02:26 PM   #20
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Quote:
Originally Posted by Jay'Z
Congrats Aceman.. This mod has made you super happy!! Hey are you going FI anytime soon? Who installed that bad boy?
You dont want to take your car there

But its in, and noprobs so far

No plans at this time to go FI

Todd

Last edited by ACEMAN; 09-14-2007 at 02:28 PM.
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