well I won't leave you guys hanging forever...so I'll give you guys a bit of info on this adapter.
the adapter has actually been developed by JWT but they do not have any real world testing on the unit so it has been somewhat outsourced to us (MA-Motorsports) as we have the means and time to do so.
the trans in my car is on its way out the door with failing bearings and worn out syncros so I am in need of a new trans for my car anyways; I've got a 25 trans on the shelf but I figured I'd try the adapter/z33 setup and see how it works.
two birds/one stone mentality here, new gearbox for the car and also test the adapter for our friend clark at jwt...
the z33 trans is a pretty good gear box, with the exception of the earlier units having syncro issues they are capable of holding 800+whp and are easy to drive and can take abuse...makes them ideal units for people pushing more power than stock and the gearing is rather favorable with it being a close ratio six speed with a single overdrive.
this adapter plate is a little 'funny' in respects that the bellhousing is actually cut off and the adapter bolts to the throw out bearing face on the trans casing replacing it completely.
what this now allows you to do is to bolt ANY nissan automatic bell housing to the transmission and convert it to the 6 speed gear box...so any sr/ka/rb/vh/vg motor can be utilized assuming that there is an auto bell available.
now rb bellhousings are tough to find but we will be testing this with the ka auto bell as dimensions for the ka and rb are close to workable and the critical dimensions for the flywheel are the same between the motors with the major difference being how the flywheel is located on the motor's crank.
I'll be using one of the prototype flywheels for my setup and it is actually compatible with both the ka and rb cranks, its a brilliant piece with dual bolt pattern and dowel alignments for both clutch styles...but if you're gonna use this on the ka, you'll want to go ahead and use the z32 na or z33 clutch for increased power capacity.
I'll also be using one of JWT's upgraded clutch covers and their more aggressive cerametalic disc for testing.
the major shortcoming of this gear box is the input shaft, its been moved back on the shaft almost 15mm compared to the shafts that nissan has been using quite literally for the past 30 years.
this is to accommodate the dual mass flywheel that nissan decided to use on the z33, why? who knows but they did.
the flywheel line that jwt has developed looks very similar to the z33 stock flywheel but with the legacy crank bolt patterns, this effectively spaces the clutch disc out to where nissan intended it to sit.
if you already have a clutch and flywheel setup, don't worry, we're also working on a spacer setup for the slave so you can use your existing setup.
the flywheel is nice if you've got an automatic motor set (or even an old worn out flywheel/clutch) and have to buy a flywheel anyways, and weighing in at 14lbs these are nice units that have replaceable friction surfaces should you wear them out.
more updates to come.
have to reassemble my transmission and take some measurements for shifter placement so I can modify the shifter assembly.