http://www.z1motorsports.com/PDFs/NATTconversion.pdf

Good info on swap... and just look at the massive freakin thread on this subject.. it will take days to read but you will get alot of info

 

OH PDF Format!!

 

Suggested things to do to the donor engine before it goes in as long as you don't need Turbo's or anything.


60k tune up kit
new harness
downpipes/testpipes
clutch/lightened flywheel
radiator
oil cooler
boost controller
turbo timer
gauges
ecu, upgrade
intake
exhaust
tt fuel pump



and then from Russell Floyd at Z1 motorsports regarding differences of the NA and TT:

"ENGINE
: 1. The blocks are the same casting. They both have oil squirters that direct oil towards the underside of the piston, although they point at slightly different angles. They have all of the same oil passages. Two passages are plugged with a bolt on the NA block (one on each outside face that feed the turbos on a TT). The TT has two oil passages plugged inside where the oil filter bracket mounts. The NA has two small check valves in this location. They are plugged in the TT so that the oil will go through the lines to the oil cooler, which returns back to the oil pan. The NA block can be used in a TT just by removing the plugs for the turbo lines and plugging the bypass holes under the oil filter bracket.
: 2. The crankshaft is the same.
: 3. Connecting rods ARE the same!! (Same Nissan part #)
: 4. Piston rings, and crankshaft (main) bearings are the same. The rod bearings are the same size but the TT ones are made from a different alloy.
: 5. Of course the pistons are different because of lower compression ratio in the TT. Oil pumps are different. They mount the same but the TT one is higher output.
: 6. Oil filter bracket on a TT is different it has an outlet that accommodates the hose going to the oil cooler.
: 7. Cams, Lifters, and valve springs ARE the same (90-93)(same Nissan Part #). The automatic TT has different intake cams (lower lift) but the intake cams on the 5 speed TT, NA, and auto NA are the same. All the exhaust cams are the same. The 94-95 cams were different than the 90-93 but just like the earlier ones they are all the same except for the intake cams on the auto TT. In 96 cams were all the same.
: 8. The valves are all the same size. But the exhaust valves on a TT are made from a stronger alloy.
: 9. The bare heads are different. They are slightly thicker on the TT as seen by the longer spark plug. This provides added strength for boost, but you could probably get by with NA heads under normal boost conditions.
: 10. The oil pan is different because the TT one has 2 tubes protruding on the sides where the oil return hoses for the turbos mount and another one for the hose returning from the oil cooler.
: The oil cooler is only on TT?s and mounts in front of the radiator and AC condensor. If converting you might want to go with an upgraded one.
: 11.The turbo engine obviously has a few different accessories and systems to accommodate the turbos. The exhaust manifolds on the TT go right from the head to the turbo, shorter path than the than the NA ones, which run all the way down to the main catalytic converter sections. The turbos are oil lubricated and water cooled. So there are oil and water feed and return lines.
: There is a network of vacuum lines and solenoids to control the wastegates for the turbos, controlling boost. If doing a conversion I recommend a boost controller, which will allow you to eliminate almost all of that stuff, and keeps you from having to worry about safety boost problems.
: 12. The throttle bodies are the same size but the passenger side one is different on a TT simply because one of the water lines attached to the bottom of it has a junction to feed water to one turbo.
The upper and lower intake manifolds are the same TT and NA although the 94 up ones are different from the earlier ones.


: ELECTRICAL
: 1. Nissan claimed the TT coil packs were different a couple years ago and charged a lot more for them. I checked them and found that they were the same and now Nissan lists them as the same.
: 2. Of course the ECU is different.
: 3. The Main engine harness is different also, but a NA harness will work in an TT, you just wont have the connections for the boost control solenoids which you don?t need anyway if you have a boost controller.
: 4. If converting NA --> TT, I would leave the interior harness and gauge cluster alone. They will work with the TT setup. Get a stand alone boost gauge because the stock one sux. You probably wouldn't add the Hicas system or stock electronic adjustable suspension to a NA so you will not need the TT interior harness.
: 5. MAF, PTU, TPS, IAA, AIV, EGR, O2 sensors, Detonation sensor, Coolant temperature sensor are all the same.
: 6. The electrical AC Condenser fan is different on a TT. The motor has three wires (2 speed) going to it as opposed to two (one speed) on the NA.
: 7. The starters are all the same

OTHER DRIVETRAIN
: 1. If converting most people would keep the NA rear differential, because a lot of TT owners switch to it anyway. It has a lower ratio (4.08 compared to 3.67) that will decrease your top speed but enhance take off. If you want to swap to the TT diff you have to swap the whole rear subframe and halfshafts. You have to do the same if installing an NA diff in a TT.
: 2. As long as you keep the NA rear diff, the NA driveshaft will work. The TT driveshaft will not work with an NA diff.
: 3. 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 and clutch.
: 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. Although, 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.
: 4. The speed sensor in the transmission is also different, which has a different size gear for NA and TT because of the different ratios in the diff. But if you are using a NA diff you need a NA speed sensor.
: 5. The 5 speed TT clutch has a larger contact face, a stronger pressure plate and a slightly larger diameter flywheel. Because of the stiffer pressure plate, the TT has a clutch booster assembly operated from engine vacuum similar to the brake booster which the same on all Z?s. The clutch booster includes two plastic tanks for vacuum storage and the hoses running between them, one under the driver?s fender and one under the clutch master cylinder. The TT clutch pedal and clutch master cylinder are also different because of the booster assembly. You could use a TT clutch in an NA or a conversion without the booster but you would just have a stiff clutch pedal.


: OTHER STUFF
: 1. The Radiator and AC Condenser are MUCH different. They are much narrower on a TT so the intercooler piping can go around each side. The front lower core support is also different (but can be modified to work with a little cutting and welding) because the TT radiator and condenser mount farther down into it because they are taller to make up for the difference in width. There are some differences in the AC lines also."

 

threads merged again.

 

JapanZ, you basically pasted a shortened version of the PDF I linked

 

Just giving a simple version to save reading or in case some people don't have adobe reader. I wasn't sure but at least we have the same sources.

 

1- does anybody know if it ends up costing more to do a TT swap into an NA than just to convert the na to a tt?
2- There is a constant rattling sound in my transmission whenever i am in 2nd or 4th gear but it still shifts fine. its been there since i purchased the car about 8 months ago, hasn't gotten worse, just been annoying me more and more. any ideas of what it could be?

 

aww hell, not this again. short answer: sell your NA and get a TT. thats likely the cheapest answer as well. do a search and check out this thread. you will find more than enough info to keep you busy.

 

1- does anybody know if it ends up costing more to do a TT swap into an NA than just to convert the na to a tt?

Is that actually a question? I think you asked the same thing twice in the same question. I think you could probably get further if people don't have to decipher what you are saying. Plus why not post pics of the car you have and people can tell you if you are wasting your time or not. I don't mean to be harsh but this is the truth and you can save yourself some stress trying to ask this type of question. If you are that confused about what to do I suggest you consider the following...

...why do you have an NA when you want to get a TT?

Answer is simple...

...buy...a...TT. Conversions can cost as much as buying a TT. Unless you have tons of cash already in your Z. Then convert. If you don't have the cash to do it I would think about what kind of car you wish to have.

 

The only reason you should do the swap is if you have a 2+2, Slicktop, Vert, or yours is just IMMACULANT. Otherwise, take off your aftermarket parts, and put them on the TT. Most will go on the TT. If you had internal engine work done on yoru NA, well you can't swap that to the TT, but your retarded for doing that anyways, (unless your name is dan and you run 13's all motor ).

 

I think what he is asking is if its better to get a tt front clip and swap, or to get the parts that are different in a tt and put them into his n/a, I dont know the answer although when I do my tt swap I intend to get a low milage tt front clip from japan and have it completely rebuilt before its put into my car

 

clip is the way to go if you absolutely MUST do the swap. you get most everything you need in one shot. but i still say just buy a TT, unless, like napoleon said, its 2+2, slicktop etc... then you have a car that was TT from the beginning and you dont have to worry about any of the myriad problems that can happen with a swap.

 

threads merged.
another one to add to the old na tt swap thread.

 

and we're surprised? guaranteed not to be the last.

 

Hey guys I was talking to a local car performace shop and they suggested that I slap some turbos on my 93 N/A. Can that even be done. How different is the tt engine compared with the n/a. I know that the n/a has higher compression. So can it even be done and would it be worth it. I would appreciate the feedback guys. thanks.

 

Yes the Turbo upgrade can be done.

 

It can be done, but it is pretty costly. Also, you can't run full TT stock boost. You can run no higher than 7 PSI, but that is on the high side. Standard would be 5 PSI.

 

Yeah it can definitely be done. But the question is why? For what something like that would cost you can pick up a used, low mileage TT engine with all the electronics AND swap it in. You could probably even get an entire TT front clip for about the same price, maybe a little more. But then you'd have a lot more potential and far more reliable motor with a compression ratio more kind with the boost.

 

http://www.z1motorsports.com/PDFs/NATTconversion.pdf

Detailed writeup on the differences between n/a and tt engines

 

I'm not going to go into the troubles of the swap cause I've never done it before but you can try ebay for motors. There are a lot of "reputable" sellers on there that operate stores dealing strictly with selling motors. Other than that there are a ton of online places. Just run a google search for import motors and you'll find a few. Another option is www.car-parts.com Just make sure you get a good strong motor and not some piece of crap.

 

http://www.z1motorsports.com/PDFs/NATTconversion.pdf

Read that, ton of info about the differences between a N/a and TT

 

If your living on the West Coast, I suggest Venus Auto (haven’t actually worked with them YET, but I know a few people who have had really good experiences with them. They had ordered 240sx (SR20DETs) & 300zx (VG30DETTs) motors).

There are A LOT of discussion topics regarding swap info on this forum, 3zc.com and twinturbo.net, also I suggest reading that PDF from Z1 that Aphrodite posted.


Answers to future questions:

1. JDM and USDM motors are both candidates.
2. An actual swap is better than just converting your NA motor with TT parts.
3. If you’re going to be doing the swap, BUY A FRONT CLIP, it will save you a lot of time, money and headaches.
4. You can expect the entire swap to be at minimum $4k+ range depending on how much you can do yourself (and this is a VERY low estimate for only the very competent). If you go with a shop you face installation fees, some recommended maintenence and then any sort of mods and you can easily be looking at 7-10k+. Really consider maintenence costs, some things are easier to access with the motor out of the car, and that time should really be taken advantage of, so consider those costs as well. I don't mean to discourage the swap idea, but just be aware of the potential costs for the job to be done professionally (and usually, RIGHT).

A complete clip should be about 2k-3k, I think Venus auto sells theirs for around $2,500 +/-. (which kills me because our entire clips costs the same as just a redtop SR motor and tranny for a 240sx LOL )

If you have any other questions regarding this swap, I suggest trying the "search" bar at the top.

 

step #1 should be to locate the search function of this forum and use it to its fullest extent. this topic has been covered ad nauseum. in fact, there is a mass merged sticky at the top of the z32 section that covers this topic in great detail. please read that thouroghly before asking any more TT swap questions.

 

I'd suggest ordering a front clip from someone, comes with tranny and everything you need.