I have an 83 turbo that I just bought, it works and Idles perfectly but it seems it will not boost even up to the zero mark. the gauge does fluctuate but it just will not go any further than just below 0..... Where do I start? Fuel is fine, Ign. fine Air filter is fine.

Is there a way to circumvent boost controller or something????

 

Would I be able to visualize this? Wastegate open?

When the engine is turned off is the wastegate closed or open?

 

ummmm, not quite....

On the Nissans the wastegate is part of the turbine housing (snail) and is therfore referred to as an integral type.

It is a simple poppet valve that is connected to a diaphram & spring via a rod & linkage (actuator). The wastegate should only open at the boost level that the diaphram/spring is set to. When open is allows exhaust gas to bypass the turbine, slowing it down & controlling boost levels.

If it is jammed closed, excessive boost (and eventual engine destruction) will occur. If it is jammed open, there will be insufficient exhaust gas flowing passed the turbine blades to produce enough shaft velocity to spin the compressor & compress the intake charge.

The attached image (courtesy of TurboNetics) shows the wastegate actuator, but the valve is hidden behind a cover.



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I dont't think so, more like the factory overboost relief valve.

 

If you find out that the turbo is bad I have a rebuilt one that looks like new.
<a href="http://www.zhome.com/~aktar/ebay/turbo/">Here's a link to a small page on it</a> I have a waste gate accuator for it, and a turbo elbow. I posted it on ebay and the buyer hasn't communicated with me since the end of the auction.

`72/`73 240Z
`81 280ZX GL
`85 300ZX Turbo
`87 Toyota Supra Turbo
`95 Mitsu 3000GT

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