tdiddy's turbo thread
12-20-2007, 09:33 AM
#104
Maybe I shoulda said, "Very almost 400.....". Speedsource uses 33 h.p. as their driveline loss calculation. I use 40 on a stock flywheel and the rest depends on the 'wheel itself.
12-20-2007, 09:35 AM
#106
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Do you notice a marked difference between the Greddy oil pan and the OEM? I realize it has extra capacity, but I've yet to see anyone claim any real benefit from it aside from the extra tap for a oil drain from the turbo...
12-20-2007, 09:44 AM
#111
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12-20-2007, 09:47 AM
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12-20-2007, 09:51 AM
#116
Nope, not really. The graph shows the efficiency of the compressor at the specified Pressure and volume. That's all. If the pressure and/or volume you want to run is not on the graph the turbo won't do it. Or won't do it efficiently enough to be represented.
12-20-2007, 10:01 AM
#121
If I did it would only ruin his engine! I am not ashamed to say I don't know everything. I am also not ashamed to say there are guys on this forum far more experienced at boosting than I am.
12-20-2007, 10:05 AM
#122
My net isn't fast enough for a real fight.........
Real world; bigger eff islands are good; breathing to 40+ lb min of air is right on the money for top end power - if you can boost and get efficient air from 10-40; life is great... but that is hard to do.
I thought Jeff has a "how to read a flow map thread???"
Real world; bigger eff islands are good; breathing to 40+ lb min of air is right on the money for top end power - if you can boost and get efficient air from 10-40; life is great... but that is hard to do.
I thought Jeff has a "how to read a flow map thread???"
12-20-2007, 10:13 AM
#123
Reading/using a compressor map is fairly simple.
Your Y-axis is your pressure ratio or PSI, it's generally expressed in BAR. 1 BAR being atmospheric. 2 BAR = ~14.7PSI of boost. To convert PSI to PR in BAR add and divide: PSI + 14.7/14.7.
Your X-axis is the volume of flow from the compressor. Generally expressed in pounds per minute. To comvert from CFM to lbs per minute divide: CMF/.076.
If your motor consumes ~26.5lbs/min at redline - like the Renesis - and you want to find a compressor that will run at 1BAR(~14.7PSI) of boost you would need to find one that will flow ~53lbs/min @ a PR = 2 at redline. Just follow left and right on the graph to see where these figures would land on any specific compressor map. What is plotted within the graph is the efficiency of the specific compressor. Each line represents a specific % efficiency. The greater the efficiency the less heat will be added to the charge as the air is compressed.
Your Y-axis is your pressure ratio or PSI, it's generally expressed in BAR. 1 BAR being atmospheric. 2 BAR = ~14.7PSI of boost. To convert PSI to PR in BAR add and divide: PSI + 14.7/14.7.
Your X-axis is the volume of flow from the compressor. Generally expressed in pounds per minute. To comvert from CFM to lbs per minute divide: CMF/.076.
If your motor consumes ~26.5lbs/min at redline - like the Renesis - and you want to find a compressor that will run at 1BAR(~14.7PSI) of boost you would need to find one that will flow ~53lbs/min @ a PR = 2 at redline. Just follow left and right on the graph to see where these figures would land on any specific compressor map. What is plotted within the graph is the efficiency of the specific compressor. Each line represents a specific % efficiency. The greater the efficiency the less heat will be added to the charge as the air is compressed.
Last edited by mac11; 12-20-2007 at 10:16 AM.
