[rolli]

Upgrading Wastegate Solenoide Spring

I've heard that the wastgate start leaking at any much more than 12psi (assuming over boost cut does not accur)...

Is it possible to upgrade the solenoide spring to avoid this??

If so, where do I get one, how much (approx), and has anyone done it/know how difficult it is?

 

[rolli]

bump

:shrug:

 

[rodhog]

No & YEs

first off you can but you will proberly end up with Exhuast gas reversion. Where the air will just push it open Factory turbo is too small ot handl much over 10psi. It won't hold anytihng over 9psi flat.

If you do change the spring or add one or another one, it will mean your boost will change and make it harder to control and might even sprike harder.

 

[rolli]

rodhog, not sure if I understood what youwere saying...

BUT: are you saying that by increasing the spring pressure, I will loose control of the boost (not pressure but its consistancy?!)

I dont quite understand how the reversion would occur, or why our turbos are limited to 10 or so psi?!

 

[rodhog]

Well basicly you will not get good boost control.

Simply the turbo is too small,andi t's internal wastegate is too small to hold much more then 12psi. If you shut and weleded up the wastegate and added a external wastegate, you could control up to 25psi.
The only real way to control high amounts of boost on a small turbo is a and electronic boost controler to keep changing the pressure to the wastegate. Then you oculd use a stronger spring to stop it opening, for high boost.

There is nothing stoping you from addign one and using a bleed valve but in most cases I have seen. Boost is okay till about into the last 1500rpm of the rev range when it goes off the sclaes usually blowing a piston or valve retian dies out.

 

[rolli]

rodhog: the reason I ask is because I am about to put on a turbosmart boost controller...

the plan was to try for 12psi (15 MAX if I get a chip). In the case, if I increase the WG spring tension, would I minimise the leakage? Or am I waisting my time, and should get a new wg (would a bov do the same job??)

thanks for your help man.

 

[rodhog]

You can get it spiking at 15psi with a bleed valve, and maybe a if oyu change the spring to a stornger one.
12psi is easy enough but will be hard to hold at 5000rpm.