$1975 for a 50k-ish mile JDM 4th gen engine to my door. 2011 popped the head gasket, so in she goes. I’m stil up in the air about re-using the 3rd gen EGR or trying to make the 4th gen’s work. Im the morning the new motor goes in and I start trying to get everything all matched up. No clear picture yet on what needs changed - every Youtube guy seems to have done it differently. I guess I’ll come up with a plan when I get the side by side to compare!
There's a water hose and a couple connections or something like I say when you have them hanging side by side it should be somewhat straightforward to look at and see what you got to change I think the EGR flow or lack there of in the newer may make perm codes . I didn't go this route because I don't think a few sleeves and some liners or a bottom ring is going to negate the problems but that will take a while to see and in the meantime I've got two generation 3's parked for similar issues One just had a JDM engine put in it right at a year ago It's not even been 20,000 miles and it's a persona but even so.
AFAIK everyone who’s used 4th Gen EGR had issues. 3rd Gen Engine Control Module couldn’t handle it? Overheating IIRC.
I thought the overheating was some bad water connections or deadheaded water connections or something along those lines and the EGR problem was the Gen 4 doesn't get the flow that the three gets maybe something along those lines I do believe but I'm not positive of that I haven't personally attempted this and hopefully not going to have to get to that me personally what I want to know is what would happen if you put a 2ZZ Corolla engine to the Prius transmission not Atkinson cycle I don't know what the difference is in horsepower at giving RPM but they're both two ZZ even though the Atkinson is detuned for hybrid applications I'm not sure how detuned it is same with the generation 2 what would happen if you made it a Yaris engine but put all the crap on it from the Prius into the generation too that stronger motor is not going to play well with the electric motors in the transmission I'm guessing so you'd have to be easy with the gas pedal or something All the cars electronics and everything is staying the same All I'm doing is changing the engine from the detuned to the non-detuned same engine family putting the stuff from the Prius onto the one NZ for the 2ZZ whichever I'm doing and that's that I'm surprised somebody hasn't tried this because over on Toyota mods and other places people change engines and things like underwears quite funny I'm just surprised nobody's tried to stick a regular one n or two Z engine in a Prius and probably has been done I just haven't tracked it down and read about it.
Yeah, I've seen a lot of reports about overheating in these swaps but I've yet to see a thread where anyone put in the effort to really find out why. I haven't seen anything to suggest it's the ECM not able to handle it; I expect it's something more basic than that (but might never get solved without somebody getting into some engineering weeds like flow rates and pressure drops).
But these are two separate problems right One is the water routing design and issue and the other is EGR flow Is EGR flow going to overheat an engine seriously I thought predominantly it was to cool the spark plug temperatures or something of that nature. Or lower the internal combustion temperature EGR does.
Even swaps with gen 3 EGR retained are reporting overheat issues. @Ragingfit might have worked out something, maybe that workaround that leaves thermostat partially open all the time. But yeah, the "why" not fully understood.
