2JZ in a Z4 Coupe - Custom Project

[dre99gsx]

Some images of the diff cooler. Exits out of some holes behind the original license plate area.

[Dan [Sac]]

Originally Posted by 3GFX

Redneck mathz:

If the stock drivetrain is built for 200,000kms at 325hp. Wouldn't that mean you should get half the life from twice the power?




NOW TURN UP THE BOOST

You did that like my wife does cooking...
"It says 30 minutes at 225F, so I'll just do 15 at 450F"

I go through more pans than ratchets

[Vanne]

Good job mate, that oughta help quite a bit. Extra fluild too.

[dre99gsx]

Just a quick recap on the GS6-37BZ transmission and how it's holding up, as well as the Z4 non-M 3.64 Diff (with a Quaife).

I have no idea how much longer these two will last, but:

- I'm on my 2nd transmission. 1st one lasted ~155 20 minute HPDE sessions before it blew. I am pointing the finger at heat. I've since installed two oil coolers and a pump, keeping it below 230F. Latest transmission is at ~70 20 minute sessions and going.
- I'm on my 4th? diff, this latest one is on ~49 20 minute sessions. Again, added larger oil cooler and pump.

I'm not sure if the cooler fluid will extend the life of these any further, but I'm at 630+whp for all of these events. I do not launch the car.

I think it's safe to say these two can handle 630whp with quite a bit of abuse. I went into this thinking the transmission would be a box of marbles but it's somehow holding the power. Perhaps don't spread this secret because I need spares to exist

The diff is smaller than the Z4M, and I may upgrade the entire rear end at some point. I'm itching to bump this to 700whp soon because why not.

I do wish there was someone else with evidence of power limit on this transmission. Doesn't seem to be much data out there...

[wdb]

Great data, thanks for sharing it.

I imagine that most of the race prepped cars are built for a particular class and don't have the kind of power you do.