120kw at the flywheel where it was 129kw when it came from the factory is a nice number dude! Compression has a lot to do with the loss of power. Maybe the previous owner did a lot of cold engine->high reving and thus damaging the engine a bit worn piston/rings etc(lower compression)

is there a way to tune the ACIS, because look and that huge dip.

it has something to do with throttle position and speed(?)
does it have different stages?

I dont think I'll do a rebuild but new gaskets and rings or is that a lot of $$$$ for nothing?

lol its pretty good the engine has the same kw at the wheels as a gen 2 engine has at the flywheel

Dont really know about tuning/modifying the ACIS assembly.

About the 2nd gen. It has 20bhp less then the 3rd gen but all considered, on the road you wont find it that much of a difference. Torque level is exactly the same and went head-head with a 5th gen 3S-GE and only got a bit away from him (2meters difference or so). But like I said, 110kw/150bhp at the wheels is about standard. Most Celica Club UK members get those numbers from there engine's. About the dip @ 4k rpm. I never felt a dip at higher rpms. It would only go higher, faster in the revs when WOT.

yes, you should be able to control ACIS, its a vacuum diaphragm which you can use a simple vacuum solenoid and rpm window switch to control. use a rpm window switch from a nitrous kit and a vacuum solenoid like what would control the EGR system (yank one from a junked camry). with a little knowhow you'll be able to set the ACIS opening point to a specific rpm and even set it to only open at WOT (with a nitrous WOT switch).

yeah thats what i was wanting, any links to give me more of an idea?

sorry no, just get a wot switch, rpm window switch, and instead of wiring them to a nitrous solenoid wire them to a vacuum solenoid. downside is acis will only work at WOT. acis is more finely controled via pcm than just wot and an rpm. its via engine load, throttle positon, and rpm. i think pcm may also control how much it opens at certain conditions as well, i havent found a whole lot about it.

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Actually, 5S-FE's can be found in a few different vehicles in Japan- the Harrier, Scepter, Camry Gracia and Mark II Qualis (all share a common platform with different North American Camry generations).