Has anyone installed the 350evo 3.9 final drive yet? If so, what are your thoughts, what has it done to your acceleration, fuel economy, etc..

 

I love it!!
I have been the only one with it.
Its release has been pushed back until after we get back from Mid Ohio GAC race which is next weekend. With getting the two cars race prepped and ready....it takes away time from the online stuff a little. This is going to our home track and we want everything ready to go. The 350Z should have a great shot at doing well up there.but the fiels is 60 cars deep which means anything can and will happen.
Cheers
BJ@350EVO.com

 

OK, you tell me then.. What does it do to fuel economy? I know it will go down, just how far down is the question. I have the Auto final drive which is like 3.2 or something like that.

Also what decrease in 1/4 mile time should I expect? What about if I went with the standard 6mt final drive which is like 3.5?
Thanks

 

you would increase your 1/4 mile not decrease it...just off the top of my head i would guess a gain of atleast 3 tenths....but i dont think the gears will work with your auto ....i believe you would have to swap to a 6spd rear dif if you wanted the gears

fuel economy i would gues of about 2 mpg...but as i dont have the difs yet i couldnt be sure

 

Yeah, what Im looking to do is install the NISMO differential, but I would also need the 6mt Ring and Pinion, so I was wondering if I should just go with the 350evo 3.9 ring final drive or switch to the standard 6mt final drive which is like 3.5?

Somebody Help Me!

 

no do the 3.9 and get the stillen valvebody
that would be one pretty sick auto

 

the 1/4 mile would most definately decrease, as would 0-60 times, not increase....trap speed might go down a tad though.

As for fuel economy, I can let you know when mine go in

 

im sorry i posted wrong ...i meant decrease ....i put in my post you would pick up 3 tenths ....dont know how i typed increase...lol
meant one thing but typed another..meant it would increase performance...

 

my guess would be a little better trap speed...but maybe a little less top speed...

my guess would be 2mph higher trap

 

What about daily driveability issues?

 

it's not going to make any significant differences in terms of daily driveability...

 

no its not going to affect drivability

 

I would guess that at about 65mph I would be running about 450 rpm higher. Does that sound about rite?

 

yea thats probobly close i would guess 350 highr myself

 

Yeah, don't forget that I have the Auto and its like a 3.2 FD instead of your 3.5.

I think I am going to keep my eyes out for anyone who bought the 350evo and see if I can get theirs. If not I will have to buck up and get the 3.9.

 

how soon you looking to do this?ill be getting the 3.90 gears soon

 

Whenever I can find one. The 3.9 is supposed to be released tomorrow.

 

yea ill be ordering in about 3 weeks....best bet is to go into the f/i forums and see if a f/i guy will swap with you...alot of 6speed f/i guys are willing to swap for an auto dif as an even swap

 

Wow, thanks for the great advice. Just out of curiosity, why would they want to do that?

 

fewer shifts in the 1/4 mile....they can top out at like 126 or something like that with the 3.3 gears