I've had the underdrive pullies for a while now and I just thought about the effect it must have on the activation of the 5th and 6th ports. If I am spinning the air-pump at a slower speed, then it would most likely build pressure slower. So, as a result my actuators won't see the proper psi untill a few hundred rpms later. Does this make sense to anyone else?

 

Makes lots of sense, but I don't know if that's the way it works or not!!!


I'd like to know too though, it's a good question.


Jeff

 

on a series 5 car like yours in your sig yes.

Not on a series 4 car

 

Shouldn't matter. The air pump moves quite a lot of air at around 15 PSI. The ports only take 2 PSI to open, so you have plenty to spare.

 

yeah, the ECU activates the solenoid at 3800rpms, and the airpump should already be providing PLENTY of airflow by then to actuate your 6-ports even with underdrive pullies.

 

I'm not sure, but i think the series 5s are opened electronically. The air pump provides the pressure to actuate the dashpots, but a solonoid is tripped by the ecu that lets the pressure in for the dashpots to work the valves.

If this is true, the airpump should have plenty of pressure to work the valves even at idle.

 

thank you!