Whats the difference between a gen 2 3SGTE and a gen 3 3SGTE? Is it external, internal or both? Also how do you tell the difference between the two?.. Mine has had engine swap, but im not sure which engine has been used.

If you could post a photo of the engine bay, we would be able to tell you immediately

easiest way to tell if its a gen or gen 3 if its got the stock ecu is wethere or not its got an AFM or not
GEn 2 has AFM, GEN 3 has Speed density setup (no AFM)
Turbo is bigger and better on the gen 3, Gen has CT26 stamped on it, Gen 3 doesnt have anything afaik
Inlet manifold has a badge on it for the gen 2 , Gen 3 is just plain cast metal.
Gen 3 has a factory oil catch system, gen 2 doesnt have one..
 
these are the usual visual differences
cheers

**** I keep hitting the thumbs down icon! Stupid iPhone.. How do you reverse that?

It has an aftermarket ecu, but I'm pretty certain it has CT26 stamped on it. Thanks.

There's a photo. So what other differences is there performance wise?

hahaha you cant lol someone else has to bump it up for me..
yeah thats the reason i mentioned if its still got the stock ecu..
the manifold for the gen 2 has the badge saying
2000 twin cam 16
Ceramic power
Twin entry Turbo
 
also the black box near the intake manifold on passenger side of the car will be missing ( gen 3 factory oil catch can)
cheers

Thats a Gen 2

oyurs is a gen2.
 
there was a thread that listed the differences.
 
if your talking just mechanically, technically everything is different tho some bits are interchangeable.
 
head doesn't have TVIS like gen2 and your old st162 celica.
 
TB is bigger, shim under buckets, better cams, differnet comp ratio, turbo, rods, oil pump, sump and cooler arrangement is different.
 
 

Yep, thought so, thanks. What, differences in performance is there? I know the gen 3 puts out more, but that's it lol. Oh and two thumbs up even that out hahaha!

That's more then I thought lol.. I guess I could change the cams, throttle
body and turbo easily enough though. Thanks.