Very true. Can hardly wait for some results!

 

Richard, where are you having this installed and how much are they charging?

 

1/4 mile time should definitely improve. Theoretically, it should improve your 0 - 60 mph time by about 1/2 second, except for the fact that you can't get to 60 mph with the 3.9 in 2nd gear they way you can (just barely) with the stock set-up. You have to shift into 3rd to get to 60 mph with the 3.9. So 0 - 60 time will improve marginally, but 1/4 mile time could theoretically improve by about a second!

BJ at 350EVO has the first one in his car, and can probably give you some hard numbers.

I don't drag race because the Tilton rally clutch and 8 lb. flywheel are so hard to launch from a dead stop.

But I expect this to be a great mod on the long straights at the all the road courses I run.

 

I am the guinea pig on this mod. I have most of the work done on my car at Performance Nissan (a Nissan dealer) in Duarte, Calif. They are the only truly mod-friendly dealer I know of.

It is a big job. They told me 7 hours labor !!! They have to drop the rear end, disconnect the drive shaft and the axles, open it up, remove the stock ring & pinion, install the 3.9 with shims, etc. and then put it all back together.

Here's a tip. If you want to get the Nismo limited slip differential (a GREAT mod for cornering on road courses) do them both at the same time. You kill 2 birds with one mod bill. lol

Unfortunately, EVO was very late delivering the 3.9 final drive, so I had my rear end opened up a couple of months ago to install the Nismo LSD. Now I'm hallucinating from the costs. But I'm a happy hippie.

 

I think unless you have a whole lot more power the Z is drag limited at 165 or something like that.

 

It shouldn't as the the sensor is based on wheel speed and the only thing that will change that is tire diameter.

 

How will this effect the RPM's?? if you are in 4th at 60mph at around 3200, how much will the RPM's go up?

 

60mph in 60 th gear =2500 rpm

 

what will it do on an automatic?

 

We have three guys signed up with automatics. (350Z and G35's)
These guys are seriously dedicated tack guys. They will be able togive good feeedback if it would be too much for a daily driver in the auto's. Once more people start getting them installed I am sure there will be planty of reviews going around the net.
Cheers
BJ@350EVO.com

 

Dwnshft:

Will you be selling the NISMO Dif with the 6mt R&P installed in a pumkin?

 

Arrived today, sweet!!!

 

Put that sucker on and let us know what you think!

 

how would this affect gas milage too? Is it gonna drop a whole lot? Im already getting 18mph from city and highway driving. I dont want it to go down anymore. For those who will tell me to ease up on the peddal, i am. I live in a hilly city (SF,CA) so bad gas milage is must.

So going 60 in 6th gear will get me 2.5rpm what rpm will going 70 and 80 get me?

Thanks

 

Yes, he plans on offering a package with the 350Evo FD (ring&pinion) along with teh Nismo diff already installed in a pumpkin. This is what they're doing for me...

 

Thanks, but Iam looking for the Nismo Dif with the stock 6MT R&P already installed in the pumpkin, not the 3.9.

 

I think I asked BJ this before. With the stock 6MT FD, my engine was doing 3000 rpm exactly at 80 mph in 6th gear. With the 3.9 FD, BJ was doing 3200 rpm at 80 mph in 6th gear. So you're looking at about a 6% or 7% increase (very rough estimate) in gas consumption.

 

Highway cruise RPM will be about 6% higher, so that'll cost you some MPG. In town, the higher torque to the road of the new gears will let you start off on hills, and drive in stop and go traffic, without as much throttle application or clutch slipping, so your in town MPG may actually improve.

Of course this depends a lot on your driving style. If you're aggressive, MPG will not improve. If you normally use the minimium throttle necessary, MPG probably will improve in town.

 

this should give m3 style speed to the 350z, since it is a similar final drive, but the m3 tops out (without the limiter) at about 180 still because of the high redline and high rpm tourque, but this gearing style is exactly how the m3 picks up speed with such meager low en torque. its a honda trick as well. but imagine this car with a tilton and this gear ratio, you should be straight pealing out into third hhahahahahaha.

 

sounds like a good mod but will pobably encourage the need for a short shifter, I hope it wont cause me to have transmission soupe from all that flogging of the gearbox, how many times do you have to change gears, what speeds do each gear maz out at, 1st must go unitll 29 mph and second proably goes to 50 and third porbably does to like 70 and fourth probably goes to 90 and fifth probably goes to 120 and sixt probably goes to 150 but i don't know , 4-6 are probably wrong because i don't relly max them out too much in stock form anyways so i have no basis to extimate.