The story continues, some more ways of controlling the boost on your machine here.

Commonly used way of raising the boost, by replacing the stock actuator with an uprated one. Manufacturers like HKS, Greddy and Apexi make these for the most commonly used turbo's and come in fixed rate, or adjustables.

Like i said they are available in adjustables too, this works by adjusting the length of the actuator rod, making it longer lowers the boost, shortening it, raises the boost.

And here comes what some would say, the best way of doing it, doing it yourself :)

Looking at the pictures above, you can see how simple it really is. If you would just take your original actuator and make it length adjustable you would have made your own, so why bother spending alot of money?

Here's what we need:
- Stock actuator.
- Iron saw.
- Welding machine.
- 1 long nut.
- 1 normal nut.
- 1 piece of thread.
- Some time & Patience :)

The first thing we're gonna do is measure the length of the original actuator and write it down. This is so we can set our adjustable to that length to keep original boost levels. For now, let's say it's 10CM.

Now we need to cut the end piece of actuator off, and after that cut off a piece which is around TWICE length of the long nut we have. Let's say the long nut is 3CM long. So we cut 6CM out (cut this piece off the long side, see the picture below).

So what we have now is an actuator, which if we held the 2 parts together would be 4CM long.

Now we have to weld a piece of thread 3CM long to the short part of the actuator.
And we weld the long nut to the other side of the actuator.

By now you can see where we are going, we now have an actuator 10CM long again, but we can shorter it 3CM, all the way back to 7CM :)

Of course you can play with this, you can also get a longer nut and make it even more adjustable so you could even make it longer then 10CM to lower the boost, but by now you should get the point.

The normal nut is used to lock the actuator rod in position so it doesnt start moving due to vibration etc. It goes on the piece of thread and locks to the long nut.

I made one of these myself for my 4AGTE (T2 Turbo) and it worked brilliant, i can set the boost from 0.05 BAR all the way up to 0.7+ BAR without any problems.

Experience says it raises the boost by around 0.65 PSI every full rotation of the threaded piece. (but off course it depends on your turbo / application).

4AGTE.NL, by Navi, 2006-2012