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Old 06-12-2009, 11:41 AM   #1 (permalink)
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turbo waste gates

I am wondering how the waste gates work and how one would benifit my old rig.
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Old 06-12-2009, 11:48 AM   #2 (permalink)
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A waste gate is used to bleed off excess pressure. There is a spring inside of it and when u shorten or lengthen the rod that will put more or less tension on the spring thus allowing you to push more or less pressure
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Old 06-15-2009, 05:00 PM   #3 (permalink)
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Are you saying that the sring contrals the boost? and, How does the boost work on a truck whos turbo doesn't have a waste gate?
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Old 06-15-2009, 06:41 PM   #4 (permalink)
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no wastegate = balls to the walls lol
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Old 06-15-2009, 08:13 PM   #5 (permalink)
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basically, presurized air goes into the wastgate diaphragm, (the spring part) which is set at a preset point, and when air pressure overcomes the spring pressure, it allows the wastegate to Open, thus allowing the exhaust to bypass the exhaust turbine and just go directly out the tail pipe. the advantage is, you can have a smaller turbine houseing, which will allow for quicker spool up, but at the same time, at higher RPM, or higher boost, you still have exhaust flow and the turbo will cause a plugup, so to speak. So your comment on how does it work on non wastegated trucks? well typically the exhaust housing is bigger and will allow the exhaust to flow no problem. hope this is clear.
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Old 06-17-2009, 12:12 PM   #6 (permalink)
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Then with the Exhaust housing bigger does it take longer to spool up and build boost?
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Old 06-17-2009, 05:08 PM   #7 (permalink)
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yes,as I understand it the wastegate allows the turbo to spool faster and also controls the boost and turbo speed on top end.
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Old 06-17-2009, 06:10 PM   #8 (permalink)
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I believe on a diesel the motor itself will control how much boost it needs by how much fuel it is getting. I know more about gasser turbo motors than diesel. But thats how I understand it. Add more fuel and it will make more boost.

The wastegate size does not do anything for spool up times. that is all based on exhaust flow and the efficency of the turbo. The bigger the exhaust, the quicker spool you get. A turbo runs best with like a 1 foot turbo exhaust port matched pipe on it.
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Old 06-17-2009, 06:28 PM   #9 (permalink)
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EEeek, misinformation...




A large turbo housing will take a long time to spool up, but will be able to flow more exhaust before EGT's and boost becomes excessive. A small turbo housing will take a short time to spool up and will make more boost, but will get hotter for a given amount of exhaust flow.

A wastegate is closed until boost builds. This allows you to run a smaller exhaust housing for a faster spool-up on the bottom end, and then the wastegate opens on the high end to reduce EGT's and keep boost under control.

A wastegate on a stock 18.5 or 21 cm first gen exhaust housing won't accomplish much. It is very important on the later 12 cm and 9 cm exhaust housings used by 2nd and 3rd gens.
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Old 06-30-2009, 06:29 PM   #10 (permalink)
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So, I was looking at my 92 intercooled 12 valve cummins and the compresser on it doesn't have a waste gate. I talked to my dad and he said that my 92 12 valve was probly better than his 99 24 valve with the waste gate. His thery was that with mine not having a wast gate it didnt waste the power that it built. But I've heard that it was a good thing to get a turo off a 94-98 to put on a first gen because of the waste gate that is on them.
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Old 06-30-2009, 06:40 PM   #11 (permalink)
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It doesn't really work that way.

His truck makes boost quick, then the wastegate opens to keep that boost (and his EGT's) from going any higher. If he wants more boost/ EGT's, he can modify/ adjust the wastegate to open at a higher pressure.

Since your truck has no wastegate, they had to make the turbine housing big enough to make sure it would never make too much boost or EGT's. That means that your truck takes a lot longer to build boost than his does.

The only advantage of a non-wastegated housing is simplicity and expense.

A turbo off a newer truck is beneficial because it has the smaller exhaust housing/ wastegate combo, and also because the compressor on the intake side is bigger.
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Old 06-30-2009, 07:39 PM   #12 (permalink)
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yeah the hot side on a 92 is 23cm2 which equals really long spool time while on some 24v(autos) have a 9cm2 or (manuals) a 14cm2 housing resulting in lower spool times
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