I'm getting my hands on a hydrolocked N/A 2+2 and a rather complete TT motor.
I know the blocks are the same so I'm imagining the TT motor will bolt right up to the N/A 5 speed. I've done a little searching but have already come up with conflicting info. Some same the N/A and TT trannys are the same, some say they are totally different. I know the diff is different, is that why people are saying they are geared differently?
I'm getting all of the piping and everything for the TT motor, the TT fuel pump, the TT ecu, hell, even the TT suspension.
The only stuff I've been able to google is stuff on how to convert the NA motor to a TT, as in change the manifolds and all that good stuff.
I haven't been able to find any sort of write up on swapping one motor for the other. From the info that I have gathered, it appears to be as technically involved as a SOHC to DOHC ka24 swap. Unless of course, I'm missing something.
Any help, info, links, tips, cheat codes would be much appreciated

 

http://upload.z1motorsports.com/Z1%2...Conversion.pdf

Here's some good info.

 

The NA and TT have the same 5 speed transmission model #, same splines on input and output shafts, etc. and the housings are the same except for one small difference. The spot where the starter mounts on the bellhousing on the TT is machined a little differently so that the starter will properly engage the slightly larger diameter flywheel and so that the flywheel teeth won’t scrape the inside of the bellhousing. You can use an NA 5 speed in a TT but you just have to shim the starter out a little with some flat washers and sometimes grind a little out of the inside of the bellhousing so the TT flywheel will fit inside. If trying to use a TT trans in an NA you would either have to grind down where the starter mounts so that it could engage the smaller NA flywheel or just use the TT flywheel, which could be used with only a TT clutch. The internals are the same between the NA and TT 5 sp transmissions, although all the 94 + models had redesigned stronger internals. We have used them interchangeably without problems.
The automatic transmission is different for a TT, but the NA auto would still fit in place behind the TT engine, but probably wouldn’t last long. They are different lengths and you would have to use the corresponding driveshaft. Both autos are geared virtually the same but the TT one is built for heavier duty.

(Taken from above link)

 

I found that. That was the page of info that was making me think that this swap would/should be really easy

 

explains why there are so many differences of opinions. The trannys themselves are the same, but the flywheels and resulting bellhousings are a bit different and the newer 94 and up had stronger guts.
and the n/a autos and tt autos are different which just adds to the confusion.

 

so far, the most difficult part of this whole process is going to be the flywheel/bellhousing issue, which isn't much of an issue at all.

thanks for the help so far

 

I have done a lot of these and can tell you that the output shaft IS NOT THE SAME. They are splined bigger. Use a NA trans with a good clutch and you will be fine.. If you put the TT stuff on, and use the 300mm clutch your foot will die.. literally. The reason is that the TT 's have a vacuum assisten clutch booster which is next to impossible to install under the dash without ripping the car apart.

The NA rear end with automatic .48 AR turbos (yes 5spd and auto turbos differ) is the best combo out there... it makes the car actually move.


Martin

 

Here's the starter shim. It's really cheap. Starter Shim Plate

 

the motor has the stock 5spd turbos and an aftermarket intercooler (memory is failing me, pretty sure it is a front mount) and it was making 356 at the wheels at 15 pounds.
I don't have a whole lot of cash to work with, considering this wasn't exactly a planned thing, but I'd like to do some little stuff while I've got the motor out of the car. "they" say a set of bigger injectors and you can up the boost to 17 (some say up to 20) with no problems. Any word on how true that is?
any other suggestions for some little stuff and/or stuff that should be done with the motor out of the car? I already have the knock sensor on the list.


thanks!

 

^^^^Well i got mine at 15 psi with stock injector but i do have jwt ecu,,, stock turbos wont last long at 20 psi!!also you may need a set of nice down pipe,test pipes and good exhaust to be good..