can u fit a dump valve to a turbo diesal

[pete bann]

Obviously all turbos have a factory fitted dump valve but would it be possible to fit a tsssccchhh valve to it?? No reason why not is there??

JUST WONDERING!!

cheers,pete

 

[PaulRobo]

Yes you can.

 

[Colin_S]

You can but it is hard. The reason it is hard is that the turbo is on all the time where as with a petrol car it is only on between certain revs.

 

[pete bann]

cheers lads. its just that i thought i heard a tssscchh noise on a TD pug 306 today.

pete

 

[Scott'y]

U can now buy the dump valve & kit for your 306 try looking at the ads in maxpower

 

[Barryd]

Colin, just want to correct you on what you said. The turbo isnt always making boost, but because they are so small they spin up at very low revs. They will still release pressure through a dump valve if one is fitted.

 

[Frosty]

The problem with dump valves and diesels is that the dump valve does not know when to open. On a petrol engine, the dump valve is connected to the inlet manifold on 1 side, and the cylinder side of the throttle plate on the other. When the throttle plate is slammed shut the pressure difference is what opens the valve.

A diesel does not create a pressure difference upon lifting off the throttle. Instead you need to fit an electronic switch the register when the throttle has been released.

Hope this helps.

 

[Fred@BTM]

so on a R5 GTT, what is the wee rubber pipe connected to the top of the dump valve that goes to the ECU???? (i think)

 

[Frosty]

No it doesnt go to the ECU! A R5 GTT runs a carb so does not even have an ECU. It connects to the inlet manifold on the cylinder side of the throttle plate. Say the car is running 1 bar of boost, at wide open throttle there is 1 bar in the inlet manifold, and also 1 bar travelling into the engine. This means that the dump valve is balanced (read my last post - 1 bar each side).

Upon letting off the throttle, you have 1 bar in the inlet manifold, but only a very small pressure (if at all) going into the engine (behind the throttle plate) because no more pressure gets in, and the engine quickly consumes what little pressure was there. This pressure is the same in the small hose we mentioned because thats where it connects to.

The dump valve has 1 bar on one side, but the little hose we mentioned is not pressurised (because it connects to inlet manifold on the engine side of the throttle plate), so there is no pressure to balance it on the other side. The piston in the valve moves to one side because of the pressure difference thus expelling excess pressure.

Now how many people have I sent to sleep there?

 

[RobFenn]

Nah this is pretty interesting stuff mate.

-Rob