Does the z32 have that same r200 diff as well?

At mynismo.com i found this item:

4.083 Ring And Pinion - Z33 (part nº 38100-0C760)

Asking them if it fits 370Z the answer that it's NOT.

According to them 350Z use a R205 DIFF... :ugh2:

Heeeelpppp!!!!!

Did you change the whole diff?

Putting on a 350Z (R200) diff with an upgraded 4.08 ring-pinion couple??

It seems this is the only way to move to 4.08 a 370 7AT.

At mynismo.com told me that 4.08 set (Ring & Pinion) for 350Z does not work in 370Z 7AT diff... (that is a R205).

Any other experiences or suggestions?

I'm a bit lost... :ugh2:

Thanks,

Gianni

Did you type that backwards on the ratio = transmissions part?

A 3.357 would give a lower RPM...


That, and I thought the rear on the 7AT's had a higher ratio...

Z32 rears will not fit into the 350Z, 370Z, they are totally different

FWIW, lots of cars (not just Nissan's) use the R200 - however, there are many flavors of R200, and not all swap with one another

i wish i knew how to do this, or at least where to go to find out what i should get

the 4.08 is without question the one to get. It's a big enough step up from the factory 3.7 that it will provide a noticeable change in acceleration, but without putting the car into some crazy rpm zone on the highway in 6th

Here is how it shakes out vs the stock 3.692 final drive. Tire used for these calculations is the 275/35/19 found in the sport package, and the factory 7500 red line. This is top speed per gear, based strictly on ratios. Obviously wind drag has a huge effect, but for purposes of this discussion it is not taken into account

Stock 3.692
1st Gear 42.36MPH
2nd Gear 69.15MPH
3rd Gear 98.95MPH
4th Gear 126.44MPH
5th Gear 160.7MPH
6th Gear 202.39MPH


4.08
1st Gear 38.33MPH
2nd Gear 62.57MPH
3rd Gear 89.54MPH
4th Gear 114.41MPH
5th Gear 145.42MPH
6th Gear 183.15MPH

As you can see, acceleration per gear will be ~10% quicker per gear, and top speed is reduced by ~10% per gear

So has anyone put the 4.08 into a 370Z Manual Trans?
This would be the best bang for the buck mod!

Imagine a stock Zed with 4.08, HFC and ECU tune.
13-15% acceleration all around in every gear.

Exactly the same R200 diff?

Here we go with the two OEM Nissan figure:

350Z

http://img143.imageshack.us/img143/4272/img3y.jpg


370Z

http://img27.imageshack.us/img27/5730/img1xwi.jpg

From the images and parts numbers, we can see that 370Z diff comes with 4 satellites..... 350Z with only 2 satellites...

The other components seem to be "more or less" the same...

Any of you can give a reliable tech opinion? :tup:

Bye,

where can I buy these gears from + whats the price?

we offer them, and have tons of 350Z/G35 customers with them over the years

Z-1 Performance Automotive Services Inc. - 4.08 Final Drive for 350Z/G35

Wouldn't the 3.9 gear set be better for DD? plus I drive on the highways alot

there is a 4% difference between 3.9 and 4.08 - and a $200 price difference, and the nature of waiting for a special order - IMHO, not worth it, but it's a decision you need to make for yourself. Your money but the factory gears being what they are, it isn't worth the price of admission (to me) to swap in ones that are a measly 5% shorter....especially on a car that wants to rev like the VQ. Heck in my car, I run 3.9's now, built NA VQ35, redline at 8400, and I'm swapping them for 4.3's because the 3.9 just is not enough anymore

the 4.08 is perfect for the VQ35HR (2007-2008 350Z), and even more so for the torquier VQ37HR

For those of you familiar with this modification, does it effect the overall speedometer/odometer numbers? Or what about Gas mileage numbers?

And also, I know changing the overall diameter of the rear tires will effect final drive gear ratio as well....stock overall diameter for 275/35/19 is 26.5...what overall diameter tire will be required to achieve the same numbers as 4.08 final drive gear ratio? Just curious thats all...I know some might be interested in changing the tire size instead of dropping the rear differential and opening the gear assembly

Would the 4.08 gears be good if my car is a daily driver?

speed is taken from the ABS sensor so zero issue with the speedometer

I currently have the 3.9 final drive in my 350Z. Stock final drive on the Z33 was 3.54 for manual trans. cars. So, about an 11% difference. My car gets exactly the same mileage with the gears as it did before them - ~320 miles before it needs to be filled. I've driven as far as 14 hours at a clip with them

you could not put a tire on the car that would equate to these gears. Tire changes amount to very small net changes in the final drive.

there are hundreds of 350Z's using these in normal everyday use

^ I've have never installed new gears before, Im just trying to learn about new parts for my 370Z, what would be the benefits of installing the 4.08's? Plus I heard something about the gears would not be good if I drive on the highway alot. I know I prob sound lame, but this is just one part I'm unsure about.

basically it shortens the gearing and allows your engine to be in the power band...longer gear ratios will take longer for your engine RPMs to rise...and when you shift gears, it falls back down further...aftermarket final drive gears modify this and keeps your engine from not falling out of the power band when shifting gears...and also allows it to rise quicker

a competent mechanic should be able to install it for $200-$300

Ya I would have my friend who is a mechanic install it for me, so I guess 1st gear would be really short right? Would it be alil pain if you drive on the highway alot? And does it affect the SRM system at all?

It has nothing to do with the SRM or the transmission in any way

The comparison vs stock was posted - add 11% to your current rpm at any speed, and that is where it will be with the new gears installed

The benefit is quicker acceleration in every gear

Z-1 Performance Automotive Services Inc. - 4.08 Final Drive for 350Z/G35

any specials going down in the next month or so?

has it been confirmed that the 370z uses the same parts as 350z/g35?

that's the price :)

Looks like a multiple-choice answer to me. Exactly what do you need for a 370Z?

Also, with you all the way that a 3.90 gear would be a waste of time and money. On a F-body I went from a 3.42 to a 3.73 and it did basically nothing.

My rev limit is set @ 8000 rpm and with 4.08 gears top speed in each gear is:

1 41mph
2 67mph
3 95mph
4 122mph
5 155mph
6 195mph

Something just a tad steeper might be even better.

So correct me if I am wrong - but the SRM basically functions using a look up table... IE: if your speed is X in gear A... then when you shift to gear A-1 rev to RPM R... so.... if you were to now change your gears to higher FD... you will be at a higher RPM for lower speeds - so wouldnt this cause the SRM to rev to a lower RPM making for some interesting shifts???

Answered my own question. Amazing what happens when you read something.

What about gear noise? Typically higher gears are noisier.

What do you get to install them Russell?

Sold.... Credit card order sent in.

Was just about to order a set of sway bars and saw the thread. I'll get the sway bars a little later......gears make ya go faster.

Nice to see some real mods comming down the line. Nice answers to the questions!

I'm not Russell, nor is there anyone here by that name, sorry - I am Adam, our other employee on this board is Kwame

I have not spent time looking up the 370Z bearings just yet, but we'll get those listed in the next week or so once I get them organized and pricing sorted.

Noise wise, nothing to worry about at all - it's all in the install. Get the lash set correctly, and you'll be good to go :)

Whoops, wrong z1

Umm no answer? Or do you just not know about this? I would imagine this would keep a LOT of people from buying gears for this car if the issue exists....

SRM is not intuitive - ie it does not know what gear you are going to select

SRM works off the speed of the wheel, via the ABS sensors, the shift lever position and clutch pedal position. It is, for all intents and purposes, automated heel-toe. It also can be turned off

What do you change exactly?

Do you install an aftermarket 350Z ring-pinion couple or what?

Thanks!

My assumption (but I don't know for sure) is that SRM works off of gear and RPM alone, as that makes the most sense and is simplest to implement anyways. Assuming that's the case, changin rear diff ratios and/or tire/wheel sizes won't screw up SRM. If a rear diff ratio does screw up SRM, then so would any aggressive change in tire diameter, and that would be just plain silly on Nissan's part and people would've noticed it by now.

and since I'm running track tires that are 1" shorter than stock and it still works fine, I believe you are right.

anyone have any idea about what it would run to try to get these installed?

Should know next week as the gears that were ordered should arrive pretty soon.

It may be a bit difficult to find people to install the gears as two shops I approached knew nothing about the car and did not want to touch it. I'll contact the local dealer to see what they say and also a trans shop that a Porsche aftermarket tuner shop referred me to.

Gear installs are fickle almost falling into an art and I've screwed up installing them before so I won’t dare try. Even someone who writes automotive text books (Bob Norwood… on one of my cars!) has screwed up installs, so the install is critical. Also, going to make sure all the necessary shims are there as w/o the correct shims, the car can sit on a hoist for days waiting the correct parts.

My opinion gears are worth the hassle and if necessary will just let them sit in my garage until the right shop is found.

Have a spreadsheet to plug numbers into that computes average hp during a simulated 1/4th run. Haven’t crunched the numbers yet and curious as to how it comes out, but gears helps the car get into the powerband quicker and multiplies torque. The real deal.

Just called Z1 and I like their style.

Instead of just shipping the ring and pinion, they bought a 370Z rear end to make sure everything was compatible before they shipped mine to me. Now, that's how it should be done!! My hats off and Kudos for them taking the time to double check and make sure something works not letting the customer be the monkey shot off into space to see if they come back alive or not. Smooth move on Z1's part!!!

Got a couple of quotes on labor. Ended up at the wrong shop the Porsche people referred me to and they wanted $600.00 to do the install. As mentioned, done it before and screwed it up before. If I remember correctly, think it was about four hours if everything goes well. The real red flag is I told the shop owner that $600.00 sounded a bit steep and he said: "but we are going to have to remove the exhaust". Auh.....the rear section is maybe a ten minute job once it's up in the air. C ya.

Finally found the right shop (it was across the street) and they wanted $400.00 to do it which is much closer to what it should be in my opinion. Guessing between $300.00 and $400.00 is the sweat spot. Being the Porsche shop uses them for their customers and their race cars..... I'll pay the $400.00 and smile as they probably do good work.

My 7 At turned 2050 @ 100km with the stock gears
With the 4.08 it tuens 2750 @ 100km.
700 rpm diff.
Fuel diff highway 7.8 to 9.8 Liter per 100km. easy driving put your foot into it and it gets alot worse.
Today i had a guy with a newer mustang Gt with exhaust playing with me I down shifted to 3rd ( rev matching sounds great) and he was not a happy camper.
45 mph to 65 ate him alive. My estimated 0 to 60 times based on the 1/8 mile and mph are 4.01 seconds.on street tires.
See 12.8 @ 110.33 in drag section for pictures and details of my car .

First......congratulations. That's more of what I'd expect these cars to run. Imagine the gears are worth between 1-2 tenths of a second. What other mods do you have?

Don't take this a peeing in the pool but based on your 60 foot times you're going to be very hard pressed to see a low 4 second 0-60 mph time. Closer to a mid to semi high four second. Drag Radials will knock about 2 tenths to maybe even 3 tenths off your time and help get closer but might be hard on the drive train. Personally not a big fan of 0-60 numbers as 50% of it is the launch. That's why all wheel drive and rear engine cars like the Porsche do so well in that category.

None the less a very respectable quarter mile and eighth mile making a good showing for the Z cars. Good for you!