ive done lots of reading where it says to set altezza fuel presure to 62 psi and let the vaccume breather vent to atmosphere.
But...
i honestly feel that the car has more hp when the breather nipple is connected. is it possible?
thing to note :
ive jacked the preasure up to like 85 psi and have the breather nipple attached to throttle body.
it really pulls when the breather nipple is connected to the throttle body vaccuume hole.
idle isnt any worse than usual.
get lots of low end power and mid torque and it feels like the engine pulls more than ususal at high rpms.
ive noticed more power over all feels like the car is running more hp.. but i dont have anything to compare to cause my altezza engine has never run correct since day one.
any insights will be appreciated;
thanks

Can you do some acceleration testing and get some figures?

It may make it richer, which could cover some lean spots and make it quicker in part of the range, but overall not have much effect.

You only find out by experimenting!

I hooked a cold-air force feed into the SU carbs on the KE70 and the daughter and I went out with a webcam & stopwatch and ran up one of the local hills time and time again. The Corolla now reaches 100kph up the hill and holds it, although I had to put a one-way flap on the air cleaner to release the over-pressure. It is fully closed under acceleration, partly open on 100kph cruise and wide open on over-run when the motor hardly uses any air at all.

All very educational!

only one way to find out - set the base pressure to stock and put it on the dyno and do some back to back power runs. anything else is pure speculation with bit of placebo effect added for good measure