choosing a wastegate spring.....

[JFoxx]

ok im looking at using dual tial mvs wastegates on my gtx35r twinscroll setup.... i am just trying to grasp how an external wastegate works properly. if your have a 24 psi spring, you will not be able to make less boost than 24 psi? because you wont be able to open the waste gate till after 24 correct? im looking to boost about 28 psi, so should i go with a 24 psi spring? or do you need more of a buffer room between the wastegate spring and desired psi? is it ok to run an 18psi spring and boost 28psi? or will it bleed out from too big of a difference?


just trying to get things done right the first time.....

[stealthsr20]

Damn... now I am curious! Someone pipe up!!!

Sent from my SCH-R760 using Tapatalk 2

[EsChassisLove]

Yes you can use a lower psi spring and run higher psi, if you have an EBC. Oh the power of electronic boost controllers lol

You'll never overboost with twin 38s that's for sure lol

[Slims]

set it lower then your desired boost. If your control fails, that will be the lowest set boost your car will run. Keeping this in mind, you will only be able to run 3x the amount of boost as the spring rate you chose. so a 10lb spring will only handle 30 lbs of boost. if you want more, then you have to increase the spring rate.

[JFoxx]

Thanks guys....appriciate the help...

[jr_ss]

You can't run lower boost than what your spring pressure is, keep that in mind.

[onehundredoctane]

EDIT: NVM I just scrolled back up and saw that someone else had already covered what I explained below.


You're correct, the rule is that whatever spring pressure you use is the lowest boost you can run. There is a second part to the rule however, being that you can run up to 3 times that boost.

So in my case I have an 11 psi spring, that is the lowest boost I can run. Multiplied by 3, the highest boost I can run is 33 psi. Can my engine handle 33 psi? Probably not. :)