Originally Posted by
AstoN_B
Isn't a dump valve vacuum operated? Hence the vac pip connected to it?
All thats needed is a valve to stop the vac when ALS is in use.
Having said that, ALS just keeps the turbo spinning so the DV will release when it's upper boost limit is reached, the turbo on rally car will boost enough to keep it open while the gear is changed since it's tiny amount of time. Giving almost full boost as soon as the throttle is opened again since the inlet is at full pressure already.
Dont really get where your coming from mate. There is no vacuum when using ALS, when you let off using ALS the pressure on either side of the butterfly is equal so the dump valve is useless, has nothing to do with boost pressure. Just something else to leak IMO so i doubt very much that they would fit them.