# help with wastegate selection **URL:** \ **Category:** PittSpeed Automotive\ **Created:** [October 15, 2008, 12:17pm UTC](https://forums.speedlife.net/t/help-with-wastegate-selection/200170 "2008-10-15T12:17:09Z")\ **Posts on this page:** 1\ **Showing post:** 13
**Author:** ![69camaro](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/69camaro/32/6046_2.png) [@69camaro](https://forums.speedlife.net/u/69camaro)\ **Post date:** [October 16, 2008, 2:25pm UTC](https://forums.speedlife.net/t/help-with-wastegate-selection/200170/13 "2008-10-16T14:25:54Z")
> [@FS: 1987 rx7 shell some other goodies](https://forums.speedlife.net/t/fs-1987-rx7-shell-some-other-goodies/35707/39): > > You dont need 4 gates! that would be crazy.lol Pressure is pressure weather its a 4 cylinder or an 8. The difference is the amount of cfm the engine will produce. V8 will create more exhaust cfm to spin the turbo. It will spool faster and make more pressure at lower rpm than a 4cyl motor. To regulate boost pressure you need to be able to bypass exhaust flow past the turbo. Since you want to run such a low amount of boost your going to need to bypass alot of exhaust. 2 38mm gates SHOULD be enouf but to say for sure I would go with 44s. > Synapse are nice for a single gate setup. With 2 there is way to many vacuum lines to deal with. I had 2 with my current setup and switched to 2 38mm tials. The knock off tials are exactally the same thing. I took a knock off apart along with a real one. All the parts are interchangable. If I was doing a budget build, I would use the knock off tials. i think im confused a little, you said i would need at least 2 44mm wastegates with a 4.0L engine. then I said its actually an 8.1L twin turbo which is two 4.0L. so you are saying use 2 44mm per bank which is 4 wastegates which i cant do, so should i use a 50mm or 60 mm on each bank. do you think that would keep pressure down? sorry for the confusion --- _[View the full topic](https://forums.speedlife.net/t/help-with-wastegate-selection/200170)._