Ok so I'm going to have my stock turbo for a couple of months....I'm thinking of getting the Forge WGA. But a wise member that has given me great advise before, told me to just tighten the shit out of the stock WGA. What do you think? What kind of results have you had? Worth it? Thanks.

Why do people replace their stock one or even tighten it? Mine holds up to 30 psi of boost and I can adjust it to hold more than the car can handle.
Are you planning on running huge amounts of boost for long periods of time?

about 24-27psi during street race. this is till my turbo upgrade.

The unit works great! I took mine off though to lower my boost with tightening the stock WGA. The forge is good for running higher boost without a boost controller. i think it does seem to hold closed a bit longer.

Why do people replace their stock one or even tighten it? Mine holds up to 30 psi of boost and I can adjust it to hold more than the car can handle.
Are you planning on running huge amounts of boost for long periods of time?


we dont tighten the stocker to make more boost on the top line. its to hold better boost in teh midrange. to keep the car from droping to 13psi at redline. you can tighten it and get 18 at redline.

thanks the point,

my suggestion is keep the stocker. i had a forge, it seized CLOSED, i put the stocker back on, car made the exact same whp.

For me on the stock turbo it held boost better in the mid range, 26 psi from 3500 to 5500 where as the stocker started at 26 psi but quickly fell to 24 psi from 4000 to 5500. The reason you don't see any peak HP gains with a Forge is that the stock turbo starts to taper due to flow limitations. At 5500 it will start tapering from 26 psi down to 19 psi by 7500 and the Forge WGA won't matter in that RPM range. I used the Forge WGA at 1 turn preload which was 22 psi minimum at low to mid RPM's and used the MBC to raise the boost to 26 psi in the low to mid range.

3500 = 26 psi
5500 = 26 psi
7500 = 19 psi
8000 = 18 psi

On my GT3076R Turbo I found that at 1 turn preload was only 17 psi minimum and the internal wastegate is almost too efficient and hard to keep shut. I'm at 7 turns preload and now it holds about 23 psi minimum. Now my Boost curve looks like this:

4000 = 27 psi
6500 = 26 psi
7300 = 25 psi
8000 = 24 psi

So on a Stock Turbo it will mainly boost mid range about 2 psi until you run into the flow limitations of the turbo. For larger turbos you NEED a strong WGA in order to keep a larger internal WG flapper shut at higher RPM's. This is one reason larger turbos usually use an external WG setup.

For me on the stock turbo it held boost better in the mid range, 26 psi from 3500 to 5500 where as the stocker started at 26 psi but quickly fell to 24 psi from 4000 to 5500. The reason you don't see any peak HP gains with a Forge is that the stock turbo starts to taper due to flow limitations. At 5500 it will start tapering from 26 psi down to 19 psi by 7500 and the Forge WGA won't matter in that RPM range. I used the Forge WGA at 1 turn preload which was 22 psi minimum at low to mid RPM's and used the MBC to raise the boost to 26 psi in the low to mid range.

3500 = 26 psi
5500 = 26 psi
7500 = 19 psi
8000 = 18 psi

On my GT3076R Turbo I found that at 1 turn preload was only 17 psi minimum and the internal wastegate is almost too efficient and hard to keep shut. I'm at 7 turns preload and now it holds about 23 psi minimum. Now my Boost curve looks like this:

4000 = 27 psi
6500 = 26 psi
7300 = 25 psi
8000 = 24 psi

So on a Stock Turbo it will mainly boost mid range about 2 psi until you run into the flow limitations of the turbo. For larger turbos you NEED a strong WGA in order to keep a larger internal WG flapper shut at higher RPM's. This is one reason larger turbos usually use an external WG setup.
Good breakdown!

For me on the stock turbo it held boost better in the mid range, 26 psi from 3500 to 5500 where as the stocker started at 26 psi but quickly fell to 24 psi from 4000 to 5500. The reason you don't see any peak HP gains with a Forge is that the stock turbo starts to taper due to flow limitations. At 5500 it will start tapering from 26 psi down to 19 psi by 7500 and the Forge WGA won't matter in that RPM range. I used the Forge WGA at 1 turn preload which was 22 psi minimum at low to mid RPM's and used the MBC to raise the boost to 26 psi in the low to mid range.

3500 = 26 psi
5500 = 26 psi
7500 = 19 psi
8000 = 18 psi

On my GT3076R Turbo I found that at 1 turn preload was only 17 psi minimum and the internal wastegate is almost too efficient and hard to keep shut. I'm at 7 turns preload and now it holds about 23 psi minimum. Now my Boost curve looks like this:

4000 = 27 psi
6500 = 26 psi
7300 = 25 psi
8000 = 24 psi

So on a Stock Turbo it will mainly boost mid range about 2 psi until you run into the flow limitations of the turbo. For larger turbos you NEED a strong WGA in order to keep a larger internal WG flapper shut at higher RPM's. This is one reason larger turbos usually use an external WG setup.

Very good brake down, thanks.
When you were using the stock actuator did you change the ECU setting to get it to hold more or did you just do it mechanically?
I know for me I can make the stocker hold over 20 psi @ redline. Don't want to though because I'm just blowing hot air by then.

With the stock actuator adjusted in I just changed it mechanically since I was using an MBC. There was actually a point where the boost started creeping in the midrange with the stock actuator because the WG flapper was so limited in movement. What I didn't like about the stock WGA cranked up was that it would spike to 28 psi, settle to 26 psi and then taper to 24 psi.

how do you tighten the stock actuator?

how do you tighten the stock actuator?

Here: http://www.evoxforums.com/forums/showthread.php?t=9070

Thanks Jimy! Is there a way to control this electronicaly instead of manually?

Thanks Jimy! Is there a way to control this electronicaly instead of manually?

No problem! Yes there're lots of electronic boost controller on the market.

good info...yeah i will be sticking to the stock. When I upgrade my turbo ill invest in a good, strong WGA. thanks guys

good info...yeah i will be sticking to the stock. When I upgrade my turbo ill invest in a good, strong WGA. thanks guys

Good plan, you can have that much more money towards your turbo upgrade.