turbo on a n/a diesel

[32 VALVES]

I have a n/a 81 rabbit truck and I would like to give hit a little more juice.  I just picked up a cylinder head of off a 2000 TDi jetta the timing belt broke but the turbo and the the intake are still intact.  So will this be a low budget project or what. I assume the manifold with the turbo will bolt right up.  but I need a flange for the downpipe.  And will the intake bolt up to my 1.6?  Also what do I need to relieve boost pressure when you are off the throttle ? a blow off valve or what...

Rick :cry:

[vwmike]

The exhaust manifold will bolt up, the intake runners are different so you can't really use the intake, and you don't need a blow off valve. Other than that there is a host of other considerations which have been covered many times. I'll see if I can find you some threads a little later.

[jtanguay]

isn't there special tubing that re-circulates boosting air to the turbo during shifting to try and lower turbo lag?  or am I wrong?

[QuickTD]

isn't there special tubing that re-circulates boosting air to the turbo during shifting to try and lower turbo lag? or am I wrong?

No, what you are describing is a blow off valve. A blow off or diverter valve is used to vent the pressure that builds up behind the closed throttle plate during a shift on a turbocharged gasoline engine. A diesel has no throttle valve, therefore no pressure can build up behind it and there is no need (or use) for a blow off or diverter valve.

[veeman]

It seems as though threads concerning "adding a turbo to an N/A diesel" come up quite often...  

Moderator:  Does this board have "stickies" or some other way to keep threads up at the top of the list for FAQ?   In a perfect world, the search function would take care of most of the questions, but in reality, that doesn't always happen.

There's some great information in a few recent threads that would probably help posters that are contemplating such a switch....

[vwmike]

These should probably help:

http://www.vwdiesel.net/phpBB/viewtopic.php?t=1699&highlight=turboing++diesel

http://www.vwdiesel.net/phpBB/viewtopic.php?t=1938&highlight=turboing++diesel

http://www.vwdiesel.net/phpBB/viewtopic.php?t=1036&highlight=turboing++diesel

We had some good arguments in this one:

http://www.vwdiesel.net/phpBB/viewtopic.php?t=556&highlight=turboing++diesel

[Caddy82rats]

Thank you for all this great informations. So my 1900IDI is going to stay IDI !

[Master ACiD]

why is it that everyone says diesels dont need blow off valves, yet every diesel comes from the factory with one.

[QuickTD]

why is it that everyone says diesels dont need blow off valves, yet every diesel comes from the factory with one.

The valve fitted to the 1.6TD intake manifold is not technically a blow off valve, its a safety valve. Its purpose is to vent excess boost pressure in the event of turbocharger wastegate failure. Some models even had the valve wired to a warning light in the dash to notify the operator of the failure.

 A blow off or diverter valve is used to release the boost pressure that builds up behind the throttle plate of a turbocharged gasoline engine when the throttle plate is closed. Diesels do not have a throttle plate and therefore do not require a blow off or diverter valve.

The 1.6TD is the only VW that ever left the factory with this safety valve. The 1.9TD and the 1.9TDI do not have any safety valve, I'm guessing that the VW engineers decided that modern wastegates seldom fail and deemed the valve unnecessary.

[vwmike]

The 1.6TD is the only VW that ever left the factory with this safety valve. The 1.9TD and the 1.9TDI do not have any safety valve, I'm guessing that the VW engineers decided that modern wastegates seldom fail and deemed the valve unnecessary.

Even so, I fail to see how a moderate overboost situation is actually detremental to the engine. If anything it would cool combustion chamber temps. The stock 1.6td doesn't even have enough fuel to push more than the stock 10 psi.

[RabbitGTDguy]

Thank you for all this great informations. So my 1900IDI is going to stay IDI !

If you have an IDI 1.9, I'm going to assume that it is an AAZ motor. To my knowledge all AAZ's run the same configuration between turbo and non turbo. Thus, where you would need to consider the fact that say a 1.6 NA motor lacks very important "turbo internals" such as the piston oil squirters, different head alloys to retain pressure and work with turbo heat as well as sodium vavles, magnesium coated pistons, etc. You need not worry about those things on the AAZ 1.9 (1900 as you describe it) motor. Its already prepped for a turbo!
You'd have to go through, find the manifolds mentioned, an intake manifold, tap your oil pan for oil return, add in oil supply line (should be a port on the oil filter/cooler assembly already) and a host of some other things including getting an injection pump for a TD motor but as far as handling it...the motor would treat you very well...

Joe