How to get more HP/TQ up top on Evo 9 Turbo
Jan 26, 2012, 11:52 AM
#62
That flange is the best on the market imo and the same one I used in my custom setup. It doesn't boost creep. There is another issue, maybe your wastegate is preloaded to much. Load a pic of the bottom of the actuator. I want to see the gap between the actuator and arm themble.
Mikey
Mikey
Jan 26, 2012, 11:59 AM
#63
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There is a difference between when a turbo starts to spool up (boost threshold) and its actual rate of spool. A turbo with little preload may start to spool at close to the same engine RPM as a turbo that is heavily preloaded, but from that point on the relative rates of spool between the two may be totally different.
The heavily preloaded one's compressor is going to produce the max volume of intake charge air that the engine is tuned for at a significantly lower engine speed(RPM) than the lightly preloaded one. Does this make any sense to you?
The heavily preloaded one's compressor is going to produce the max volume of intake charge air that the engine is tuned for at a significantly lower engine speed(RPM) than the lightly preloaded one. Does this make any sense to you?
Last edited by sparky; Jan 26, 2012 at 12:05 PM.
Jan 26, 2012, 12:16 PM
#66
So when I put more preload on the 5200rpm area will creep higher and higher, as well as rasing the boost else where, however, it makes it so that I have very little control over my boost. My boost profile is also not that great.
This is about the best I can get it. This is with tweaking the WGA Preload, and the MBC to get it as close to 28psi as possible.
Jan 26, 2012, 12:45 PM
#67
That flange is the best on the market imo and the same one I used in my custom setup. It doesn't boost creep. There is another issue, maybe your wastegate is preloaded to much. Load a pic of the bottom of the actuator. I want to see the gap between the actuator and arm themble.
Mikey
Mikey
Jan 26, 2012, 02:36 PM
#70
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Thanks for the better description of your particular boost scenario! Refresh my memory if you will. What WGA are you running? Is it the FP 18 or the 25 psi unit? Did you have to use much force to pull it over and mount it up onto the peg on the flapper valve's pivot arm?
Last edited by sparky; Jan 26, 2012 at 02:39 PM.
Jan 26, 2012, 02:51 PM
#73
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If I am understanding you correctly with the MBC turned all the way out to its softest, that is, lowest boost setting you are seeing 25 PSI at 3600 RPM? What gear are we doing this boost run in anyway? And also, what is your intended peak boost target level?
Jan 26, 2012, 02:58 PM
#74
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I went back to your first post and went through your mod list again. You don't have an MBC do you? Instead, you are running an EBC, right? Also, I discovered that you are using an FP 25 PSI actuator...not the 18 PSI unit. OK, I stand corrected. My mistake.