# wastegate spring **URL:** \ **Category:** SON240sx Automotive\ **Created:** [September 19, 2006, 9:13am UTC](https://forums.speedlife.net/t/wastegate-spring/100028 "2006-09-19T09:13:22Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![90sohc](https://avatars.discourse-cdn.com/v4/letter/9/47e85d/32.png) [@90sohc](https://forums.speedlife.net/u/90sohc)\ **Post date:** [September 19, 2006, 9:13am UTC](https://forums.speedlife.net/t/wastegate-spring/100028/1 "2006-09-19T09:13:22Z")
hey guys i know this is noodish but… i have a greddy profec b, t3/t4 and i want to run about 18-20 psi or what spring should i be getting in my wastegate?? im not sure what it should be or how to calculate if there is a calculation. will a tiall 38mm with a 1 bar spring work for me? ---
**Author:** ![90sohc](https://avatars.discourse-cdn.com/v4/letter/9/47e85d/32.png) [@90sohc](https://forums.speedlife.net/u/90sohc)\ **Post date:** [September 19, 2006, 9:21am UTC](https://forums.speedlife.net/t/wastegate-spring/100028/2 "2006-09-19T09:21:47Z")
sorry guys… did a search and found what i needed mods can lock and or delete this, or leave i open to make me take my punishment and flame like a man. haaha ---
**Author:** ![Happy240sx](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/happy240sx/32/5515_2.png) [@Happy240sx](https://forums.speedlife.net/u/Happy240sx)\ **Post date:** [September 19, 2006, 9:25am UTC](https://forums.speedlife.net/t/wastegate-spring/100028/3 "2006-09-19T09:25:21Z")
Yeah - that spring will work. You want your wastegate spring to be the LOWEST boost you will ever run. So assuming you are okay with running a minimun of 14.5psi of boost you will be fine (and then using your profec B to boost to 18 when needed) ---
**Author:** ![90sohc](https://avatars.discourse-cdn.com/v4/letter/9/47e85d/32.png) [@90sohc](https://forums.speedlife.net/u/90sohc)\ **Post date:** [September 19, 2006, 9:37am UTC](https://forums.speedlife.net/t/wastegate-spring/100028/4 "2006-09-19T09:37:59Z")
thanx. i just wanted to make sure there wasnt like a calc to make sure you dont overboost, i did a ll more research and found what i needed thanx again