7AT 4.08 Gear swap QUAIFE LSD Trans cooler diff cooler
 

WOW. Special thanks to Seb over at Specialty Z in Chatsworth. So glad I had him do the gear swap. The gear ratio just feels right. The new LSD (Quaife) hooks up much better. No squirrely business in corners. I definitely have more confidence
driving this beast.

I really didnt know what a good LSD was.

Also did a ridiculous job installing the trans cooler and upgrade to -8 size.The new finned Nismo diff cooler looks bad ***.

These guys have great attitudes ! I dont mind driving the 2 hours to have them work on my car.

If you dont mind me asking how much did they charge for the Diff work? Im just hunting around to get an idea of prices. A PM would be appreciated!

Same here!

both pm'd

Should be about a three hour job

Just a few questions. Was it a major improvement over the sport LSD? Why do you have an aftermarket tranny cooler? Do you track the car?

Hi ,

In regards to a 3 hour job, I think that might be for a 6MT gear change and not including changing the tranny lines and fittings to bigger sizes as well as fabricating the brackets to allow for the biggest trans cooler that would fit.

I converted the gear ration in a 7AT and had to use a 6mt LSD housing to allow for the gears to fit.

In regards to tracking. Yes, I track the car about 6 times a year (its all I can afford)

My goal is to build a somewhat bomb proof N/A track car. It doesnt mean at some point i wont go TT. But right now I , I produce 315 at the wheels and my thought is whats the use in having horse power if you cant put it down the right way.

Everything that is being built/upgraded is with the intent to make it dependable and if I do upgrade to TT , Ill have all of the necessary pieces somewhat in place.

The after market 1.5 LSD's that are available ( in my opinion) are much better than what is stock. If you race , you'll notice you can really drive the corners and hook up better out of the apex. Its not as squirrly.

Anyway, my 2 cents. I hope i answered everyone's questions

Also the gear change coupled with the new LSD is a huge difference. Best upgrade for the car.

Let me know how the Quaife goes on the track. I've been on the fence about Quaife vs a clutched 1.5-way for a while. The Quaife is appealing because it's cheaper and lower-maintenance, but I worry about the one-wheel-lift scenario.

Please elaborate

I assume you mean about the one-wheel-lift? Quaife (and Torsen, etc) are geared LSDs, as opposed to e.g. OS Giken or Carbonetic (etc) that make clutched LSDs for our cars. On the clutch ones there's more regular maintenance and parts wear to worry about. The geared type are relatively maintenance-free.

The tradeoff with the geared type is that it stops working correctly (reverts to open-diff behavior) if you completely lose traction on one wheel by putting it in the air. It needs at least a little traction on both wheels to do its job properly. When that one wheel goes completely traction-free, it spins and no power is delivered to the one on the ground. It's not that hard to put a rear wheel in the air mid-corner on a track. You can do it on flat pavement with some cars+drivers+corners, and you can definitely do it to the inside wheel while skipping over some kerbing on the inside.

The question that's unresolved, to me, is how disruptive this is when driving. If it's a minor annoyance maybe it's worth it. If the sudden traction change tries to spin you off-track with a violent and unexpected transition in the rear every time it happens, I'll take the high-maintenance option :)

I'm having a Quaife installed today. I would have done it myself but I don't have all the tools needed plus I found that a cut to the stub axle might be needed. Here is a really good DIY.
I'll let you know how it works on track after the July 21st event at MSR Cresson.

I don't have as much time on the track as some of the other members. I went with the Quaife because of the maint involved with clutch as well as my track car is still a daily driver. My belief was this was best suited for a daily driver as well as track. The clutch are probably better suited for strictly track. I did not want to change the fluid or service the LSD every couple thousand of miles.

where'd you pick up the QUAIFE? and mind if i ask how much you paid for it?

I've had the QUAIFE LSD for about 4 or 5 months now and two track events. Still the stock gearing but I agree this made the car feel so much better, I would not want to do any track days with an open differential that's for sure.

I just wanted to let everyone know that you do have to cut the stub axle on the 370z with the QDF13L (Viscous diff replacement) just like in the DIY
http://www.the370z.com/members/dr_-a...e-stub-cut.jpg