has anyone here open the pressure and the vacuum chambers on the FD.i am curious as to whats inside that makes it so important.even if they both had diaphragms i don't see how the pressure fluctuation makes that much of a difference when the small electrical solenoids are controlling both vacuum and pressure.

 

There's nothing inside them. They are just pressure and vacuum accumulator boxes to allow the solenoids to have a supply source when the manifold doesn't have the required pressure or vacuum available. That's why they are important.

 

from what i can tell the turbo control solenoid valve is that intricate and sensitive that you need two solenoids (h and f) for charge and relieve along with a vacuum chamber box for it to maintain a certain amount of pressure.how many psi does that closed system needs to hold with in that loop for that turbo control solenoid to work?

 

Its just a hollow chamber. Nothing special inside them.

 

The turbos control actuator needs to be fed with both boost and vacuum so that it operates quickly. The only way to have boost a vacuum at the same time is to store one of them in a pressure chamber, In the case of the TCA, the boost comes from the turbos and the vacuum from the vacuum chamber. The amount of pressure or vacuum stored in each of the chambers will be the pretty much the maximum of each generated by the system.

 

has anyone ever to replace the turbo control actuator with one like the turbo wastegate actuator?
the delay can be controlled by a manual boost controller so that the turbo control actuator can be activated after the primary has reached 8-10 psi.can it?

i think the stock T.C system is too complicated and not very reliable to control just one actuator.

i might be totally wrong or maybe i don't understand quite well but this is what i was thinking.

 

how do i make that picture bigger?

 

I'm pretty sure the turbo control actuator needs vacuum and pressure so that it responds fast enough. There was a thread recently that discussed the difference between the FD sequential system and the Supra system.



The Supra system has a few less actuators and needs only a pressure tank. Many suspect that the Supra had a more powerful ECU than the original FD ECU and that in turn allowed for more mechanical simplicity.

 

Some say the Supra had a neuro-net processor .. a learning computer.. unlike the prehistoric Abacus present in the first FD`s