Turbo Effeciency Tables
Evolving Member
Joined: Jul 2007
Posts: 125
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Amazing work as always.
It appears the Green is a lot more efficient down low than I had though.
My goal was to tune for 27psi. It appears that I can get 27psi as early as 2600 rpm assuming a 90 VE ratio this low. Then I can easily hold 27psi until 6000 rpm (100 VE). There after the turbo rapidly runs out of breath. By 7400 (95 VE) I should be no higher than 21psi.
Now the goal is to find this boost down low.
I started another thread about tuning for faster spool....
https://www.evolutionm.net/forums/ec...ter-spool.html
There is some wonderful suggestions so far. The goal, in my case, is to have to longest torque curve as possible for AutoX, and the occasional Track day.
I am not sure if I am estimating my VE correctly though. Can someone chime in on the exact method to calculate accurate VE ? ? ?
It appears the Green is a lot more efficient down low than I had though.
My goal was to tune for 27psi. It appears that I can get 27psi as early as 2600 rpm assuming a 90 VE ratio this low. Then I can easily hold 27psi until 6000 rpm (100 VE). There after the turbo rapidly runs out of breath. By 7400 (95 VE) I should be no higher than 21psi.
Now the goal is to find this boost down low.
I started another thread about tuning for faster spool....
https://www.evolutionm.net/forums/ec...ter-spool.html
There is some wonderful suggestions so far. The goal, in my case, is to have to longest torque curve as possible for AutoX, and the occasional Track day.
I am not sure if I am estimating my VE correctly though. Can someone chime in on the exact method to calculate accurate VE ? ? ?
https://www.evolutionm.net/forums/6674697-post167.html
Last edited by Danieln; Jan 12, 2010 at 10:55 AM. Reason: Off Topic
Thread Starter
Evolved Member
iTrader: (22)
Joined: Nov 2003
Posts: 2,408
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From: Northern KY near Cincy
No you are fine....don't worry about it.
For spool though...try this thread...
https://www.evolutionm.net/forums/ec...ter-spool.html
For spool though...try this thread...
https://www.evolutionm.net/forums/ec...ter-spool.html
Here are "my" 0.02
If anyone wants more, I suggest this one... Has some pretty good info including a method for selecting a 400 hp turbo for a 2.0L, that is if you can stand the authors obvious obsession for an Ecotech...
Turbocharging Performance Handbook
Last edited by EvoIan; Jan 13, 2010 at 01:29 AM.
Evolved Member
Joined: Oct 2002
Posts: 2,788
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I thought it was because exhaust back pressure was overwhelming the gate. Do you have any evidence to prove what you are saying?
Evolved Member
Joined: Mar 2008
Posts: 730
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From: Lattitude 48.38°, Longitude 17.58°, Altitude 146m = Slovakia, for common dude
It is also called aerodynamic blocking, once the velocity of air passing thru flow intersection area overcomes local speed of sound the aerodynamic block happens (chocking). It simply nature of a compressor.
I can't link you to anything, but I know people who have welded their gates closed. That doesn't matter. The compressors have a flow limit. There is nothing that you can do to surpass that. You aren't going to flow 100lb/min out of our compressor wheel no matter what you do. That is what compressor maps are for...to find the operator range of that compressor wheel and match an engine to it.
Evolved Member
Joined: Oct 2002
Posts: 2,788
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I can't link you to anything, but I know people who have welded their gates closed. That doesn't matter. The compressors have a flow limit. There is nothing that you can do to surpass that. You aren't going to flow 100lb/min out of our compressor wheel no matter what you do. That is what compressor maps are for...to find the operator range of that compressor wheel and match an engine to it.
But how do you explain an almost entirely stock Evo bleeding boost similarly to a highly modded Evo... when the modded Evo has way, way more airflow for the same amount of boost.
Evolved Member
Joined: Oct 2002
Posts: 2,788
Likes: 1
If the former, it's set like that in the ECU...one of the reasons why we get boost controllers or tune the ECU boost control. If the latter, it doesn't matter how many mods a car has. The compressor's max flow doesn't change. The mods help with airflow at the same psi, as long as you aren't at the compressor's limit. Also, mods will help with VE and/or timing advance which can give more power.
But, the max airflow of the compressor isn't going to change.