98 Celica st205 Options

[bhsk8er]

Alright guys,

This is my first celica and I am extremely new to turbos and such. But I have a few questions. If i want to get a bov, where would I put it? I've read that people have been putting the HKS SSQV's in the st205's.

And also, Is there any way of converting this engine to OBD II? I have a few applications in mind.

I also would like to know if converting my exhaust downpipe/exhaust to a 3" system would be bad.

I've read mixed forums on all of these matters and would like clear and straight answers if possible.

Thank you, and greets from Okinawa, Japan!

[anonymous]

Restricting your exhaust to aid in boost control is sacrilegious imo. Upgrade the wastegate and enjoy the gains from the larger exhaust. 3" is a good size for most 4cyl turbo cars.

Switching to OBD2 will not benefit you in any way. The easiest cars to diagnose are those with a standalone with a data logger. I can turn my key on, turn my crank by hand and see in my logger when the spark plugs and injectors are fired.

The BOV can be connected anywhere between the compressor discharge and the throttle body. I have had them on the cold pipe and the hot pipe and there is no discernible difference. If your car has a mafs or an afm you need to recirculate the bov discharge back to the turbo intake (post afm/mafs and pre turbo). If you do not you will have stalling issues and extreme rich conditions between shifts.

It sounds like you are in over your head. I recommend you step back and try to learn the fundamentals of engines, forced induction systems, and basic efi engine control before you make choices you regret. If you knew what the bov's purpose was, what the afm does, how the ecu uses the afm, etc. you would know how to hook up your BOV from principle. Learning is half the fun; mindlessly bolting on parts is boring, unrewarding, and usually expensive in the long run.