Diy 10psi Actuator.

[TornadoJudd]

I know a T that runs a 10.9 1/4 mile with the same mod. It works and its cheap

[RAP1D]

LOL... I did this 10 years agon on a mitsu TC06, worked well and was fine for 2 years... amzing no one here had thought of it earlier... but then again

Nice work Dennis, this site needs more "out of the box" ideas

[bcl]

I’ve never seen this before; very interesting DIY.

Design issue is that you have little flexibility. You need to find the right spring, or use an additional spring.

I’d suggest that you have an adjustable arm attaching to the spring to give it length adjustment to modify spring tension. You have around 30-40mm to play with.

Brian

[DennisRB30]

  hiddeous said:

How long do you expect the spring to retain any tension once its exposed to the heat from the exhaust housing?

←

Who gives a sh*t?

Its a stainless spring and will probably be fine. If it goes soft it will be fail safe as boost will go down not up, then I can fit another $2 spring in 2 years time when it goes soft. It has lasted for over a month so far.

  Quote

Design issue is that you have little flexibility. You need to find the right spring, or use an additional spring.

I’d suggest that you have an adjustable arm attaching to the spring to give it length adjustment to modify spring tension. You have around 30-40mm to play with.

Brian

I have also made a DIY adjustable arm. I cut the rod and threaded each end then drilled out the non threaded part of old bolt and put a tap through it. So now I can adjust preload too.

There are no design issues due to lack of flexibility compared to the alternative of purchasing a one spring $120 actuator.

FWIW I just found these springs lying around at work and whacked one on and went for a drive. Boost was stable at 10psi (before boost spiking which is not the springs fault but the wastegate since it done it without the spring). I went to zero effort of finding springs. I bet if someone went to the effort they could find a range of springs which could easily be swapped for what ever boost level you wanted. T

Edited 21/02/07 10:01 AM by DennisRB30

[DennisRB30]

I also ported my gate. The flapper is about twice the size. Even with 2 springs the gate is being forced open which is giving me about 500rpm extra lag, but I get a stable 0.55 bar boost curve.

I need more spring pressure.

Do the upgraded actuators have a larger diaphragms to allow the use of very heavy springs without massively increasing boost pressure.

The springs worked great with the stock sized port.

Edited 25/02/07 04:18 AM by DennisRB30