AVC-R hook-up question

[Rich]

Can anyone tell me why you have to hook-up the avcr solenoid differently with an external wastegate than an internal wastegate?

internal:
http://i137.photobucket.com/albums/q230/pr_ludwig/Junk/avcrintWG.jpg

external:
http://i137.photobucket.com/albums/q230/pr_ludwig/Junk/avcrextWG.jpg

The big difference is that with the internal set-up the solenoid directly controls the wastegate and with the external set-up it acts as a bleeder.

Is this because the solenoid can't handle the bigger flow of air and higher boost which you get with a bigger turbo that normally goes with an external wastegate?

[Rennat]

External wastegates work differently than internal wastegates.

[suprastanger507mgte]

I think it has to do something with how the wastegate is ? Either closed or open.

[Rich]

External wastegates work differently than internal wastegates.

can you elaborate?
as far as i know both work with spring loaded actuators, only difference i can see is an external WG is bigger and needs more pressure to operate

[Rich]

I think it has to do something with how the wastegate is ? Either closed or open.
i don't follow..., both are normally closed untill opened at a certain pressure

[IJ.]

The Internal Gate hookup on the AVCR is a simple bleed of the + signal

so 10 psi spring/10 psi signal bleed 5 psi = 15 psi boost.

Doing it this way you'll get to a point where the boost will blow the valve off the seat and you can't hold boost.

The External one uses + pressure on the back of the diaphram to achieve the desired boost pressure.

10 psi spring/10 psi signal/5 psi into the back of the diaphram = 15 psi boost.

Doesn't have the above mechanical limitation allowing the use of a very light spring for normal low boost driving.

[Rennat]

Ninja edit haha

What are you running anyways? just hook it up like the picture... seems pretty simple to me.

[Rich]

Ninja edit haha

What are you running anyways? just hook it up like the picture... seems pretty simple to me.
i'm running a sp67 with a 50mm WG on a 1.5jz
i have it hooked up like the second example, that's not the problem
the problems i have is that i get spikes in 4th and 5th which i can't tune out and i can't get a steady boost, i've tried playing with all settings like feedback speed and start duty.
I have my avcr for years and know how to operate it, but somehow since i went big single i can't get a steady boost, it goes up to 90% dutycycle and i'm only aiming for 18psi but it spikes to 21psi in 4th and 5th which i don't like because i only use pumpgas and that's pushing it

[Rich]

The Internal Gate hookup on the AVCR is a simple bleed of the + signal

so 10 psi spring/10 psi signal bleed 5 psi = 15 psi boost.

Doing it this way you'll get to a point where the boost will blow the valve off the seat and you can't hold boost.

The External one uses + pressure on the back of the diaphram to achieve the desired boost pressure.

10 psi spring/10 psi signal/5 psi into the back of the diaphram = 15 psi boost.

Doesn't have the above mechanical limitation allowing the use of a very light spring for normal low boost driving.

thx for the info

but what would cause the boost to spike when it's hooked up like the second example?

[IJ.]

Rich: Do you have (NO) hooked up to anything?

[Rich]

Rich: Do you have (NO) hooked up to anything?
nope, that's open, like in example two

[IJ.]

Next time I have the hood up I'll check how I plumbed mine.

I seem to remember something about a 2mm restrictor in the line to the WG to prevent it overshooting.

<Ninja Edit> This is how I plumbed mine this time (http://www.motec.com.au/drawings/v14.pdf) (Been using Internal for many many years now)

[Rich]

Next time I have the hood up I'll check how I plumbed mine.

I seem to remember something about a 2mm restrictor in the line to the WG to prevent it overshooting.

<Ninja Edit> This is how I plumbed mine this time (http://www.motec.com.au/drawings/v14.pdf) (Been using Internal for many many years now)

so you have the poppet type WG (external), but have it hooked up like the flap type WG (internal)?

so i could use the avcr internal set-up for my situation as well?