I need details/parts how to install a valet... unable to find much in the search or past posts. Thanks

My afc is plugged, no line to wastegate. HX40 has wastgated line built in.

Thanks,
John

 

Mystery switch usually refers to a torque converter lockup control.

Are you looking for a valet switch?
A solenoid to open or close boost sense to the AFC?

 

Sorry no photos of my truck (auto) that has what you wish to see. AFC connects directly to intake mainfold with an air solenoid valve in the middle.
Hopefully your truck has the boost line plugged after the "T" in the line that used to connect to the wastegate.
Actually very simple to replace the "T" with a solenoid. Just need to pick a key operated 12v power source for the switch.

-John

 

Can you please explain how this works for me??

 

Anybody want to explain the "valet" switch??

 

It cuts the boost signal to the AFC, so it can't fuel. No fuel no power, thus valet mode.

 

I know it sounds simple, but let me ask a slightly different question with regards to the installation of the valet switch (solenoid).

Boost is generated by the turbo, which is routed to the AFC housing AND the wastegate. Therefore, the purpose for installing the valet switch between the manifold and the AFC, is to retain the boost elbow (if you have one)? It would seem to me, that you could install the valet switch anywhere between the manifold (source of boost) and wastegate...correct?

Also, just a thought...if you are into "blocked" wastegates...installing a valet switch between the AFC and the wastegate, would allow very low boost, to max boost...correct?

Lastly...if the turbo boost is vented in valet mode, is there any detection of a hissing sound from under the hood?

 

I cannot locate a side photo of an AFC housing to help with theory of operation.

The AFC "foot" that fits into the slot next to the fuel plate and moves forward when boost presses on the diaphragm. The governor lever never touches the fuel plate until the AFC foot moves forward. That's why you slide the housing forward and turn the starwheel. The forward action allows more low boost and low rpm fuel.

Well, after all this plate & AFC forward stuff, your truck gets very smokey at low boost and has lots of zip (EGTSs).

To control low boost smoke and help keep the EGTs in check, you interupt the boost signal to the AFC housing. No boost means the "foot" doesn't move. The foot holds the governor lever back (less fuel).

If your wastegate signal is from the intake manifold side and tees into the AFC housing, you want the air solenoid to only block boost to the AFC.

If you have larger injectors & delivery valves, a blocked wastegate can still cause boost issues, epsecially when the housing and starwheel is forward.

A solenoid should block not vent boost.

 

Anyone make their own valet? If so, what did you use or whare did you get the selanoid valve?

thanks

 

Fueling Around...

Maybe I am overthinking this...and yes, the solenoid would not vent, my mistake...but if I block the boost pressure from the manifold to the AFC, then I am also blocking the boost pressure to the wastegate. With that said...am I to assume, with the solenoid closed...and the AFC receiving no boost...therefore no fueling, that in turn, I will only see minimal boost from the Turbo? Basically, low fuel = low boost? Is this the basics of the Valet Switch?

As for where to get a solenoid. www.mcmaster.com
Polypropylene Direct-acting Minitature solenoid valve, 12 volts DC, 100 psi max. Part number: 7877K55 $18.12 each (with 18" wire leads) or 7877K25 $17.18 each (with spade connectors).

Just go to their site, and put in the part number, to get a visual...hope that helps. Of course, there are more expensive ones...but these appear to serve the purpose at an economical price.

 

That solenoid from McMaster-Carr is too light duty. Temp rating is very low. I don't remember my duty rating on solenoids coils.

I got a pair of solenoids from Heath Diesel on the bargain bin. (They sold out very quickly). They are 100% duty rated from a fan stat control on a diesel truck.
A toggle switch in the dash to cycle power is all that is needed. Just make sure to pick a "key on" power source

The idea is to block boost from reaching the AFC housing only. The statement
"Basically, low fuel = low boost? Is this the basics of the Valet Switch?" is OK.
The Valet switch actually operates by blocked boost = lower fuel.
Ideally, one could block the entire boost signal to both AFC and wategate.
As I said, with big injectors, blocking the wastegate is not a good idea.