I based the 0 to 60 time using the 1/8 mile data calculator from drag racing sites.
Thats the # that i got. Its only a educated guess. But it gets there quick. Its only a # that you can compare other cars with using the same formula.
First gear is a blast when it hooks and does not spin.
You will love the 4.08gears but, they can be a pain in trafic, and it hurts gas mileage/ diff is 700 rpm at 100 km.
Im considering the GTM. supercharger set up. Sam will have it ready for me very soon.
11's here we come. Target is 420 rwhp.

There is some good to short gears also I think. My tC has very short gear ratios stock, but I often get caught in traffic and it actually works out real nice. While other guys with MTs have to ride the clutch to move slowly and over short distances, I can just put it into 1st gear and crawl. Much easier on the left leg IMHO. Tall gears can be annoying in traffic.

Basically with about every bolt on engine mod available during logging for fuel/air and timing with the AccessPort, the best 0-60 time I got was 5.01. it appears to be pretty accurate. This was achieved doing about a 3000 rpm launch, letting the tires grab and giving it hell after that. Granted, on a sticky drag strip and playing with tire pressures, could get it a bit lower but probably not much more than a couple of tenths. The problem again with 0-60 is the launch as it grossly favors cars with slicks, all wheel drive or rear engine.

My guess is the drag site made an auto assumption you were using slicks and probably a 1.4-1.5 sixty. The best 60 with my Vette using MT Streets was a 1.52 and it being an honest 600 hp car. Also broke a bunch of crap too because of too much bite.

Trust me.....with you all the way on the benefits and surprised how many people aren't aware of how much better the cars perform and how much more fun to drive. Frankly didn't know they were available or would of had the 4.08's long ago.

Once the gears are in I'm sitting on the fence for a bit. Biggest issue is the cars are so new everyone is working out the bugs. Still can't tune the car with the AccessPort as the software isn't ready so feel like I'm stuck in the mud for now.

I just called Z1 and they have no clue about a 4.08 gear for my G37, whats the deal

Z1 motorsports or Z1 Performace? They are two separate companies.

i think that solved my problem OWNED! hahaha thanks

We'll see in the end, but as far as I'm concerned Adam has been great doing what I consider the "right thing."

Even though it has been a month, should receive the gears either today or tomorrow. Why a month? Adam wanted to double check the fit and ordered both the 4.08's and a stock set of gears to take measurements. Gladly wait the extra time to make sure they fit correctly.

Off to a medical meeting or I'd have them installed this week but when back will get them installed and hopefully to the new drag strip here in Dallas. One last tuning session on the dyno also. Thirty acres of concrete, 4800 feet long and heated/air conditioned bathrooms. (Pretty neat facility)

Currently 323 rwhp (sae) and my guess is high 12's around 110 mph.

We are Z1 Performance, located in NY, and been around since 1996

Z-1 Performance Automotive Services Inc.

We have no relation to any other company/products that may use the same name.

Denny - good luck with them, and any questions, you know where to find me!

Yeah i called z1 motorsports bc I got confused, they were actually somewhat rude and kept transferring me to different guys.. lol.

[QUOTE=Z1Performance;

Denny - good luck with them, and any questions, you know where to find me![/QUOTE]

I thank you sir. Seriously looking forward to the gears as they really wakeup certain cars. With the rev limit bumped up and the powerband as it appears on the dyno sheet, expecting good things.

Kinda down to the wire on delivery as my flight to a meeting in San Francisco leaves later today. Hopefully Fed Ex will catch me before I leave. My wife is coming with me but returns before I do. Just something about spending money on parts and tearing apart a new car she just doesn't get. Everyone does that to their six month old car right?

Of course! Mine came straight home from the dealer and up on jack stands!

i had the 4:10 set up with spray and drags and i ran 12.6 at 118 for my very best time. nut now the car is in shop and ill have much longer gears for the twin turbo set up =]

cant wait !

I read on a 350z forum that an upgraded lsd is required to be able to handle the power from 4.08 gearing and bolt ons. 1st and 2nd gear just spin even with the viscous let alone the open diff that I have in mine right now. If that's even remotely true it'll affect us more having more power stock and making more power from bolton's than 350 hrs. Z eliminator said he had trouble getting traction from the 1 to 2 shift dragging but his is an automatic which is going to be harder to deal with than a manual I'd guess. Anyone think it's a waste to buy the gearing without going with a better lsd? Quaife, Kaaz, nismo, etc.

Any aftermarket diff will improve traction, but the bulk of any spinning issue is in the tire/launch technique, and alignment. The aftermarket diffs really shine in the turns

That being said, an aftermarket lsd is a very, very worthwhile upgrade on any Z, especially if it's a base, but even vs the stock viscous (which is no bueno as it is). It all comes down to budget ultimately

can someone provide a solid list of what install kit and gears are needed with part numbers? lots of people want to do this. IIRC the speedo is not affected correct?

So ur saying the car handle the power in a straight line given good tires and driver? Im just worried 1st gear will be useless until i upgrade to a better lsd which is over a grand without install.

Im still wondering If I can do this on my G37

Someone, PLEASE update with part numbers and prices necessary.

Z1, please let us know when you will be updating your site and offering the complete kits for this install for the 370Z.

Finally, it would be great if someone could take pics of the install process...Denny, could you do this and post when you get yours installed? That would be awesome! And, it would reduce confusion by our respective mechanics and lower our install charges and hassles...

Thanks in advance...

bump........

so do we have to have an LSD to go to different FD gears or can us non LSD guys still do the gears?

Im doing hfcs intake and tune and see what kind of traction i have and go from there.

The installation is not a DIY at all - you need a shop experienced with ring and pinions to handle it. It's not an install where pics will really help anyway - it's a direct swap for stock, and all the labor involved is in setting the spacing up/shims

For those interested, we have them available for purchase on our site:

http://www.z1auto.com/prodmore.asp?m...ne&prodid=4392

nope, not necessary at all - as long as you have a manual transmission car, these will go right in!

I gots the 7AT so what would I need to change FD gears to 4.08?

I have not looked into auto's at all, so I am afraid I can't answer that. On 350z's, you had to change the differential to one for a manual car in addition to the ring and pinion change. I don't know if it's the same on the 370Z or not though

What would it take to get you to look into the autos? I have a G37 5sp auto that I'd like to do a gear swap in.

I have a feeling the auto's are just like the Z's, meaning you will need to replace the differential to one from a manual (stock or aftermarket) as well as doing the ring and pinion

Yes, it is the same.

I got an used diff from a manual 350Z and installed the 4.08 set up.

Now, my 370Z 7AT is incredible in the sequence "1st-2nd-3rd gear" :tup:.

Very very very short gears and quick shifts.

Note: i added the sprint booster to the throttle, other great modification if you like to drag the 7AT car :driving:!

Thanks for the info on the gears. Now I have to make a post on that sprint booster (not a fan).

I like to get up and go and have been thinking about upgrading to a LSD and changing the gears. How does the new gears do for normal daily driving too?

If I put in as lsd do I still need the diff from a manual? Thanks.

Yes, the pumpkin of the manual car is necessary.

You can buy a "good used 350Z dif" for 400 $.

For what concern normal daily driving it is so subjective...

I'm a big fan of short gears, I prefer acceleration respect to top speed.

With a 4.08 set up on a 7AT 370Z, the 250 km/h speed limit and the 7400 RPM limit - in 7th gear - are very close each other. So you can imagine the situation with a bit of fantasy...:rolleyes:

THE GOOD: the car feels like a toy.... The way it "eats" gears is very exciting to me... And it is true both in the street (1st-2nd-3rd = fantastic :eek:) and in the highway (5th-6th-7th is fantastic too...). 250 km/h are enough for me...

THE BAD: the car burns more gas, exhaust noise can be boring on the highway, especially if you have an aftermarket exhaust... the jump between 4th and 5th gear is still there, the 4.08 set up clearly does NOT remove it... and the engine oil temperature issue is even more critical than stock...

But at the end: i'm very happy with the 4.08 set up :tup:

I got my Z to feel it, to live it...

And during the week ends - with my family - it is still very confortable to drive our Murano on the highway @ 120 km/h and 2000 RPM ;)

Just wait till you take it down the 1/4 mile. I just got my rims and drag radials. Get a cobb and raise the limiter to 8100 and set the speedlimiter to 280. This way you can dyno in 5th gear. My gas milage dropped from 7.7 L and went up to 9.2 L per 100 km/
36.7 mpg to 30.7 mpg. Rpm at 100 km was 2150, now it 2750.
Is it worth it " Best mod i did".
Soon to be the first N/A to go into the low 12.6's.

Did it throw off the speedometer? I thought I read that it's off transmission input speed... Or front wheel speed.... So the gears wouldn't effect the speedo.

No the speed is taken from out side the Differental. Your cruise control will not work.

Come again with the cruise control statement. Is that just the autos doing the switch? I can't imagine a simple gear change killing cruise.

It did it on my 350z 5 AT and it the same thing is happening on my 370 7 AT.

Can someone else verify this? I don't see why a gear swap would kill the cruise control?

the speedometer has nothing to do with the final drive, so it is unaffected

if the car is an auto, cruise will no longer work

Understand, swapping the ratio on a manual will not affect cruise control.

Why does cruise no longer work on the autos?