being fairly new to the PSD I have a simple question that I would like to throw out. I live in an area where the temps have been running about zero to 10 below zero the past few weeks and during the day radiant heating to about 20 degrees. I will let my PSD warm up (its been plugged in all night) about 10 minutes and then carefully begin my drive to work. It takes some time before the PSD begins to run normally without restricting the throttle. It seems like it won't allow me to put much fuel to it until about half way to work (5 miles.) The temp guage is above the line about 1/8" before it seems to work normally. Sometimes it allows me to simply drive off with no retrictions at all but MOST of the time it holds me back until it really warms up. What is retricting the power and shifting? I do have a Diablo chip. Someone told me it is a protection system for engine. I would like someone to explain exactly what is going on and why. Where is the sensor that creates this restriction and when and how does it operate. I know there is a lot more PSD pros out there that know because I sure don't. Thanks :-X11

 

What you are feeling is the exhaust backpressure valve. It is located on the exhast side of the turbo housing. It has a butterfly valve in the exhaust stream to restrict exhaust flow which puts a small load on the engine to help warm up, just like the heat risers on the older gas engines. Its operation is dependent upon intake air temp and oil temp.

Les

 

Is there any way to get it to "lighten up" earlier than when it's almost fully warmed up?

 

Other than unplugging it, No.

Les

 

What does unplugging it mean? If it's a mechanical valve, are you talking about gutting it like a cat?

 

There is a modular plug-in with 2 wires in it, plugged into what looks like a solenoid on the aluminum turbo base. If you unplug it the back pressure device won't come on. Unplug it and just leave the wire hang in the valley and check for 2 things: (1) see how long it takes for your heater to get warm (you may find out that you liked it better plugged in) and (2) if it gives you a check engine light (I don't think it will but if it does, you'll have no choice but to keep it plugged in).

 

>There is a modular plug-in with 2 wires in it, plugged into
>what looks like a solenoid on the aluminum turbo base. If
>you unplug it the back pressure device won't come on. Unplug
>it and just leave the wire hang in the valley and check for
>2 things: (1) see how long it takes for your heater to get
>warm (you may find out that you liked it better plugged in)
>and (2) if it gives you a check engine light (I don't think
>it will but if it does, you'll have no choice but to keep it
>plugged in).
Sounds to me that you live in real cold area,that's all!