SD 3750rpm leans out/stutters any ideas?
#31
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Isn't SD tuning fun? I've still got bugs with my 9653 SD set-up on BF 272s with a 3.5 bar Kavlico, but nothing like what you are describing.
Did you derive the 3.5 bar settings for direct boost control? I have not been able to find or derive those. I did use the 3.5 bar SD scaling in the SD links thread without a hitch, so I think it's okay.
Did you derive the 3.5 bar settings for direct boost control? I have not been able to find or derive those. I did use the 3.5 bar SD scaling in the SD links thread without a hitch, so I think it's okay.
#32
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Isn't SD tuning fun? I've still got bugs with my 9653 SD set-up on BF 272s with a 3.5 bar Kavlico, but nothing like what you are describing.
Did you derive the 3.5 bar settings for direct boost control? I have not been able to find or derive those. I did use the 3.5 bar SD scaling in the SD links thread without a hitch, so I think it's okay.
Did you derive the 3.5 bar settings for direct boost control? I have not been able to find or derive those. I did use the 3.5 bar SD scaling in the SD links thread without a hitch, so I think it's okay.
I have them phenem's rom should have them built in though.
https://www.evolutionm.net/forums/ec...ar-sensor.html
#34
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i think thats my problem, i did try changing the sensor calibration (it skewed the left column), but i never reset the left column back with the new sensor. i'll give that a try tonight and see how it goes!!
#35
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Curious to see what the fix is; I've experienced the same issue on my car and have been chasing my tail to resolve it. Same RPM region (3750-4000) after which it pulls clean again. I've messed w/ both RPM VE, MAP VE, jitter settings, verified MAP sensor calibration, etc. I was starting to think it was either the result of running the Magnus V5 and using a vacuum hose for the map sensor or the BR dual pump w/ Hobbs switch (should make richer though?). Good luck and post up if you figure it out.
haha, no kidding! these setups are pretty similiar then... i pulled the fuse on the double pumper thinking it was causing issues because i have had that happen before (hobbs switch triggered to low and fuel pressure was spiking to 100+psi and car would buck hard... new higher switching hobbs switch fixed that problem). i also thought it could be resonances in the vacuum line to the MAP sensor, so we cut the line about 5 inches shorter (its about 2 inches long now) to see if the resonance frequency changed.... of course it didn't
#37
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XML def: <table name="SD MAP Sensor VE and Calibration" category="Speed Density Tuning" address="32e8" type="2D" level="2" scaling="MAP VE load">
<table name="MAP" address="32c6" type="Y Axis" elements="8" scaling="kPa OMNI4barMAP"/>
</table>
#38
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See attached screen shot. Currently using Jitter fix #1, although I never had the issue in the lower RPM range. I'm using the Omni 4-bar, I won't be able to test until tomorrow as my engine build just wrapped up.
XML def: <table name="SD MAP Sensor VE and Calibration" category="Speed Density Tuning" address="32e8" type="2D" level="2" scaling="MAP VE load">
<table name="MAP" address="32c6" type="Y Axis" elements="8" scaling="kPa OMNI4barMAP"/>
</table>
XML def: <table name="SD MAP Sensor VE and Calibration" category="Speed Density Tuning" address="32e8" type="2D" level="2" scaling="MAP VE load">
<table name="MAP" address="32c6" type="Y Axis" elements="8" scaling="kPa OMNI4barMAP"/>
</table>
You have taken the same steps such as upping the VE in those ranges?
#40
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You could also try the original rom the 9653 one to see if its some odd incompatibility.
Last edited by RoadSpike; Apr 13, 2010 at 09:28 PM.
#41
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ok, so tried:
5bar map sensor = still had the problem
tried ecu from an 04 evo 8 = still had the problem
tried road spikes tune with our injector scaling = still had the problem
tried roadspikes tune scaled for the 3.5bar = still had the problem
tried putting a MAF on with a basic rom (not V7) = still had the problem which means its mechanical
so then we tried hot wiring the second pump from the buschur double pumper and disconnected the primary pump = still had the problem
took out the sparktech CDI and went to stock coils = still had the problem but got a little better
going to try the injectors back to stock... can't think of much else... cam angle sensor maybe?
5bar map sensor = still had the problem
tried ecu from an 04 evo 8 = still had the problem
tried road spikes tune with our injector scaling = still had the problem
tried roadspikes tune scaled for the 3.5bar = still had the problem
tried putting a MAF on with a basic rom (not V7) = still had the problem which means its mechanical
so then we tried hot wiring the second pump from the buschur double pumper and disconnected the primary pump = still had the problem
took out the sparktech CDI and went to stock coils = still had the problem but got a little better
going to try the injectors back to stock... can't think of much else... cam angle sensor maybe?
#44
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Just wanted to say thanks to everyone that Helped out. Finally we figured it out and who would have guessed it would be the last thing we would try. Now its time to make some power