turbo Flow vs. PSI
- Thread starter 87targa
- Start date
Here is a good illistration. As you can see, the highest pressure is in the compressor housing, which is why you put your wastgate reference there. Should try taking a pressure reading there.
As the air flows through the blades, air is compressed. As it leaves the housing, it decompresses. So that shows that the compressor wheel is NOT blowing. If it was, the highest pressure reading would be as it exits.
Another thing to consider is the speed of sound. Centrifugal compressors have one draw back. The air at the tips can will reach a choking point or Speed of Sound. This will limit the CFM a compressor can flow. The greater the air is compresses as it leaves the compressor wheel, the more air mass there will be.
This is the same effect of a velocity stack. As air enters an intake runner with a radius port it will compress. Since air has mass, then laws of inertia take part. This will cause the air heading into the runner to compress, allowing more air to enter into the runner at the same air velocity. Which is why you should NEVER EVER EVER EVER EVER EVER EVER build an intake manifold without a radius port.
As the air flows through the blades, air is compressed. As it leaves the housing, it decompresses. So that shows that the compressor wheel is NOT blowing. If it was, the highest pressure reading would be as it exits.
Another thing to consider is the speed of sound. Centrifugal compressors have one draw back. The air at the tips can will reach a choking point or Speed of Sound. This will limit the CFM a compressor can flow. The greater the air is compresses as it leaves the compressor wheel, the more air mass there will be.
This is the same effect of a velocity stack. As air enters an intake runner with a radius port it will compress. Since air has mass, then laws of inertia take part. This will cause the air heading into the runner to compress, allowing more air to enter into the runner at the same air velocity. Which is why you should NEVER EVER EVER EVER EVER EVER EVER build an intake manifold without a radius port.
SuperRunner;1009394 said:
yes and no. yes because i think i know what he means, just poor choice of words.
Pressure is pressure, the value never changes unless the meter is out of calibration.
Pressure changes with different compressors at different RPM's. Flow increases with larger/more efficient compressors at the same PSI vs. a smaller/less efficient one.
How much has back pressure increased to maintain the same PSI, and how hot is the air charge?
It will take a larger intercooler to decrease the temp of a hot charge which will result in a larger pressure drop.
Basically a GT35R will have to BLOW more air to keep the same psi that a GT40R can do with compressing it instead of BLOWING it.
Roots vs Wipple, kind of like GT35R vs GT40R.
Not really an accurate example, but it shows a relation for blow vs compress.
It will take a larger intercooler to decrease the temp of a hot charge which will result in a larger pressure drop.
Basically a GT35R will have to BLOW more air to keep the same psi that a GT40R can do with compressing it instead of BLOWING it.
Roots vs Wipple, kind of like GT35R vs GT40R.
Not really an accurate example, but it shows a relation for blow vs compress.
BTW, that illistration made me realize that my WG reference is in the WRONG SPOT. I have it at the outlet. It should be at the inner most part of the "SNAIL"
Which is why you'll notice that Toyota changed the location of the wastegate port in the middle of the Mk3 production.SuperRunner;1009427 said:
step 1: http://www.amazon.com/Maximum-Boost...=sr_1_1?ie=UTF8&s=books&qid=1209763947&sr=1-1
step 2: ????
step 3: profit at friends expense
step 2: ????
step 3: profit at friends expense
