4 port boost solenoid

[A80Avant]

I run a 3 port mac valve connected to top and bottom chambers on the wg.

To stop any creep I applied 100% duty (mac valves are fine with it) at all parts of the map which were below the target boost, so the valve is switched on until slightly below the set boost to avoid any overshooting. I found in the higher gears it was not possible to do it like this because the turbo spools that well that the engine can't consume the air (ie: surge), so the wg needed opening well before max boost just like wg creep to keep out of surge

In the lower gears (1-3) the method works well and noticeably improves the turbo response, especially on a laggy turbo.

Baz

I'll try this tip. Since I can now have a gear depended boost, I can only apply this on the lower gears to speed up spooling.

[gnutz2]

One of the greatest benefits with the 4-port is that you are not so depeding on the springpressure.

For example. With my S2 I had a tial 60mm valve with this 4-port. I hade a boost range between 0,5-3,0bar. Awesome for a daily driver with 780hp
As you can have such wide boost range you can adjust power on low gears to get the best traction. If your ecu has this option.
Or boost adjusted based on tps for example.
Ofc I use MaxxECU. ;-)

Edit: used 0,5bar spring

That must be one hell of a daily driver

Interesting that the 3 port mac valve vents the top side of the wg to open it but pressurizes both sides to close and relies on the spring. The 4 port works the same way to open the wg but vents the bottom side when closing which would be advantageous if you had a weak spring.

[Error404]

Can you not use the 3 port valve with a light spring by supplying reference pressure to the top chamber and venting off to open the WG?

[gnutz2]

Can you not use the 3 port valve with a light spring by supplying reference pressure to the top chamber and venting off to open the WG?

Thats how it should be done! But it still relies on the spring to shut.