Originally posted by adomakin
im having a bad day. I still dont understand! I thought the wastegate was actuated by exhaust pressure not boost pressure! I understand that the stronger the spring in the wastegate the more resistance to exhaust pressure and therefore the more boost you get but I dont get how a little electronic box can have such a big influence on such a large mechanical process.
1. Wastegate is actuated by pressure on wastegate diaphragm
. Exhaust pressure has little influence.
2. If you remove the hose feeding the diaphragm, wastegate will never open and boost will raise in uncontrollable manner.
3. If you have small electro-pneumatic valve controlling the feed of wastegate, you can let computer controll the boost by simply shutting of and opening a small valve.