I have completed my swap..
Issues I ran into relating to the engine swap it self: None, like previous replies have stated.. the JZS171 drops right in.. I replaced my engine mounts because I have no clue the condition of the ones that came with the engine.. as well as the usual seals, belts and valve cover gaskets, also inspect condition of donor engine hoses clamps etc before dropping the engine in..
Things that I wish I id while the engine was out: replace all hoses and upgraded the fuel lines etc etc but since you are on a budget like I was.. if those things are still good then whatever..
Some minor things that I have encountered but did not see on the threads:
- the fuel feed banjo looking thing that attaches next to the engine block, the motor I got had the banjo piece attached but I took it off and attempted to attach the stock is300 feed line, but it is 1. too short and 2. its a different bend so it doesnt fit as it should between the two metal pieces designed to hold it steady.. so I got a longer hose and attached the 1jz banjo piece to it and it fit nicely.
- fuel return is a must, you can leave the stock fuel dampener and regulator if you are thinking on leaving the system stock, and just follow some of the fuel return threads here for the fuel pump modifications..
- the abs can be left where it is but its a tight fit with the stock cooling pipes for the turbo, I kinda nudged the whole thing more towards the body of the car but its still tight in there, doesnt seem to be rubbing though..
Now.. the differences with the 1jz for our swap as what blkaltezza said: jzx100 is more common but more of a headache wiring wise ( for guys like me who just want a stock application).
jzx110 is the next best thing, drops right in but now you have to worry about the immobilizer etc, other than that its not hard to repin what needs to be repined..
and finally the jzs171, which is what I went for due to the fact that my car is a 2001 and I was hoping to get the tiptronic working out of it because I planned on keeping it auto.. ( which I finally got working
); the jzs171 comes with the A340E/LS transmission which supports tiptronic since the Toyota Crown has it.. the Jzx110 has the A341E transmission as does the jzx100 (if you buy it with the auto and plan on keeping it)
another thing you must know between the JZX110 and JZS171 is that once wiring is done, with the JZX110 your gauges will work properly (except the top gauge showing fuel flow) but with the JZS171 I have noticed that the temp gauge does not work.. I had to get an aftermarket coolant temp gauge.
the hardest thing about the swap is finding the diagrams (for me).. the jzx100 has all kinds of diagrams all over the net, and the jzx110 has a few good ones now that it is becoming a more common engine, but the jzs171 doesnt have a lot of info on it and most of what I found is in Japanese..
I have yet to figure out the alarm system with my jzs171, the radiator fans do not turn on at all (but I bridged the connector and they are on all the time) and THE A/C SYSTEM!! I believe the jzs171 ecu does not have a pin labelled "FAN" and based on the is300 diagrams "FAN" controls the radiator fans and "A/C Diode" which I believe is the reason my A/C doesnt engage when I press the A/C button.. it's very frustrating but I am slowly learning the wiring diagrams and reading more info online to figure everything out.. but as for the swap itself.. everything is good, loving the 1jz so much..
I basically repeated what most people said but whatever.. to answer your question.. I spent about $3600 on my swap and that includes the engine trans ecu harness & shipping which I got for $1400.
and yes my Tiptronic system works!! cruise control works as well but who uses that? and traction control does not.. again who needs that?? lol