Boost pressures & wastegates on D24T

[armalite8]

Hi all. Does anyone know:

What the standard boost on a european 740 D24T is, how to increase it 'easily' (without swapping the turbo, may as well fit a supercharger if I'm going that way) and what a safe, road use boost would be?

Where the damn wastegate is (Can't see it and can't get a service manual for love nor money it seems!) and how to check it's working?

Does the intercooler kit off a diesel 760TIC just swap over onto the same 740T lump?

This is my first turbo diesel, always run high compression V8's on LPG before so excuse newbie questions. Cheers.

[mAydAy]

Playing wtih the D24 can be risky business, its a very complicated engine. First thing I'd do for power on it is check out that everything is in good condition. Does it smoke? Believe it or not the smokestack Volvo diesels when properly tuned don't smoke much at all.
The intercooler kit off a 760TD should work.

-Andy

[Led]

From what I recall. The D24T is actually a VW power plant. You might check with VW people and see it you can find some info on it.

Later,
Stephen

[mota37]

I wouldn't mess with the boost on that thing unless you are sure your enrichment solenoid can supply the extra fuel. Its located on the fuel pump. The engine is made by VW but don't bother asking a VW shop cuz they'll brush you off. When I called the VW shops they said they only serviced VWs. I'd find a shop that specializes in diesel engines. If you can't find a service manual for it just but a book for a VW fox diesel. The only thing that is different is the pump timing belt is on the back of the engine and the cam belt is on the front. Oh and there's 2 extra cylinders. But its one hell of an engine to work on. If you bump the boost and not the fuel say bye bye car. You'll never know its running lean but the tops of the pistons will turn to liquid. But those engines do run a bit rich to begin with so you should probably be ok changing the boost a little. But if your lacking power, which is a given with that engine. I'd try new injectors the pressure springs inside of them wear out and so you get more like a slug of fuel then a mist. This causes crazy ass smoke and low power. The injectors are also prone to building up carbon really bad too. Like really really really bad. You should also have your pump timing checked. It shouldn't cost too much from a dealer. And change your fuel filter. Once water gets in it, it wont get out on its own. Diesel also jells up if it doesn't move, this plugs the filter.Another problem is plaque just like on your teath builds up in the fuel lines. You can get a germacide/fuel dryer that will eliminate both water and plaque. Only after all that is done would I touch the boost. I worked on a non-turbo but I did come across info on the turbo. And I'm pretty sure its got a different waste gate then other turbo cars. But to help find it, follow the hose from the enrichemnt solenoid on the pump around to the turbo. I'd bet they are connected to some where in the same area. And if you can find a 760 intercooler kit put it in. Then you can definatly bump up the boost about 2psi. But to be honest the car is never gonna be fast. If all else fails you can just give the car to me.

[volvo9]

It's not as simple as turning up the boost on a gasoline car, diesel engines have no throttle bodies, and power is controlled by the ammount of fuel injected into the cylinder, up untill a certain point when there's no more air available to feed the mixture and adding more fuel is just a waste and makes a crap load of smoke, unless the engine is turbocharges, and more air can be added to help that extra fuel burn.

To be able to raise the boost on that car, I believe you've got to modify the injection pump, which is a complicated device. usually, a shim is placed on a certain part in the pump to up the pressure.

You can give twisting the wastegate rod a shot, but it might not even have one, your best bet will be to talk to someone specialising in diesels, they're a complicated, yet simple concept and are very interesting.

search the net for diesel injection pump and learn some more about it, and how diesels work.