3.9FD + tilton must be awesome on a rev up engine

exhaust might be worst bang for $, but it sounds nice
nice sounding car is awesome in it's own right

 

thats one thing I have noticed - I have not lost any practical MPG in my mixed use driving. I still get 340 to ever single tankful, the same as I got when my car was new and unmodded

 

a cai intake improve your mpg by atleast 1.5mpg....the article in speed mag has shown that the 3.9 + tilton flywheel....beat all 4 fi cars at the track by more than a full second....it seems like these mods are the truth...not hype and myth.

 

is there only one manufacturer of the 3.9 final drive? Just wondering if there were other options...

 

there's 2. Forgot the name. The price is about the same

 

Any 5AT Owners that are Happy / Unhappy. what do you have to do differently for the 5AT again?

 

you put the 6MT gearing in the car

you can put the 3.9 in, but it's going to be pretty aggressive - possibly too much, but since no one has ever done it, who knows...

 

Its made by Central20 and the price is half that of the 350evo one once shippping from Japan is included.

 

Today I drove 30 miles on the highway in one trip and according to my fuel economy screen I averaged 28.4 mpg while cruising at 72-75 mph. Not bad considering that at those speeds I am revving at or slightly above 3000 rpm in 6th gear...

 

thanks sentry65, mchapman, maybe i'll try pick one up if i go to japan later this year. It might not look too cool on the x-ray detector though.

 

Manual transmission car in NA form will love the 3.9.....for the auto guys I would suggest swapping to the 6MT 3.5.
You will love the performance gains you get from the 3.9 and should see it soon in the Nismo catalog.

 

Are you implying that the 350EVO ring/pinion will soon be sold under the NISMO name?
Is there any objective way during assembly to ensure correct fitment/shim placement?
Will a competent shop know how to install this right the first time, or will it need trial/error tweeking?
Thanks,
Mika

 

will this alter the smog in anyway? as in.. if i get smog tested.. will they some how detect that something is changed?

 

don't think so

 

Does any one have any before and after 1/4 mile times with the 3.9 gear?

 

yeah you go faster, kinda the point of the mod right?

whether you use these gears or not, you still gotta shift 3 times in the 1/4 mile. Might as well get 10% more power....In the context of NA

 

Just wondering how the Z compares to other cars with gears where shaving a couple of tenths is usually the norm.

I haven't done the math but also wonder at what rpm you'd be while crossing the traps.

 

well without the ECU flash, i guess it adds an extra shift



6600 RPM

OEM/3.917

1st 37.5/33.8
2nd 61.2/55.2
3rd 87.5/79.0
4th 111.8/101.0
5th 141.7/128.0
6th 178.8/161.5


With Techno Square reflash rev limit @ 7100

1st 36.9
2nd 60.3
3rd 86.2
4th 110.2
5th 139.7
6th 176.5

 

I did a before and after review of the 3.9 when it first came out including the 1/4 mile. I did not drop any time from my 1/4 mile e.t., but I did pick up 2 mph on the trap speed. I don't know if you can find the review. I also did a 0-60 in the review and ran a 5.1 second 0-60 recorded via a OBDII datalogger.