WG Springs questions

[rdroguett]

Hi guys

any one can explain me the difference in use a spring in a wastegate for boost controller and use a mbc form controller el boost precure.

thanks!

 

[ECLIPSE10358]

Wastgates use different size springs to control boost pressure, if you want a higher or lower boost level you have to swap out the spring inside the wastgate.
Manual boost controllers are set up to quickly adjust the boost with a quick turn of a knob. That is a quick explanation of the two. Further information can be found many places on here.

 

[Tim_I]

Wastgates use different size springs to control boost pressure, if you want a higher or lower boost level you have to swap out the spring inside the wastgate.
Manual boost controllers are set up to quickly adjust the boost with a quick turn of a knob. That is a quick explanation of the two. Further information can be found many places on here.

+1 Im going to run a 10 or 15lb spring in my wastegate. That way if my boost controller fails it will drop down to a low boost setting and run on straight wastegate pressure. As well as not over boost and hurt my motor.

 

[BowDownRacing]

I run a 5lb spring with a electronic boost solenoid I was able to get 32lbs out of my turbo setup gt4094r v60 wastegate water to air setup. a big spring doesnt always mean you will get more boost sometimes its better to run a smaller spring.

 

[gofer]

This is actually not the case, running a softer wastegate spring that's designed to run less boost will actually limit the amount of boost you can run with a boost controller. Most wastegate manufacturers will advertise twice the advertised spring pressure, i.e., a 14.5psi (1BAR) spring can only effectively hold twice that using a boost controller, which is 29psi.

I'm not saying that you can't run more than double the spring pressure but, once it's exceeded, the wastegate won't operate as efficiently and boost control will suffer.

To the OP: Every wastegate, even the stock one, is set to hold a specific amount of boost which is the LOWEST amount of boost you can run. For example, the stock wastegate on a DSM holds 11psi and is the absolute lowest amount of boost a DSM can run using it; even with a boost controller. Boost controllers can only RAISE pressure from what the wastegate will hold, typically twice the amount as I mentioned above.

And if you're wanting to know the difference between an internal and an external gate here's some info from Forced Performance's website.

Q. What's the difference between internal and external wastegates?
A. Internal wastegates are comprised of a flapper door which is built in the turbine housing, usually operated pneumatically by a mechanical actuator. These flapper doors are limited in size, but work well in certain applications. Usually found in smaller turbos, internal wastegates are relatively inexpensive, simple in design, and very durable. Larger turbo can be fitted with internal wastegates, but boost control can be tricky. If you are looking to run high boost (20+ psi) all the time, then an internal gate may be fine. If you are looking to run lower boost levels, you will need an external wastegate.

External wastegates are generally mounted to the exhaust manifold or to the O2 housing, and are self contained units. External wastegates have the ability to bypass large amounts of air, and can provide steady boost control at any pressure level. A common myth is that in order to run higher boost pressures, you need a larger wastegate. This is incorrect. Larger wastegates are necessary to run low boost levels on large turbos.

 

[rdroguett]

Fixed! thanks guys

 

[haddixjl]

I always heard the best way to control boost was with nitrogen or co2 on top of the wastegate and an electronic boost controller. I know high HP drag cars run that way but for street duty I wouldn't want to deal with getting tanks filled