VE Table fall off at 100 kpa
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Teching In
Joined: Sep 2012
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From: Atlanta, Georgia
VE Table fall off at 100 kpa This need to be moved to Tuning. Looks like I accidentally posted it in the wrong place.
Can someone explain to me the cause of the dip at 0 psi manifold pressure (1 atm or 14.7psi) in the tables? I've playing with HP tuners for around 3 years on and off tuning my own turbo car. My car is almost tuned and runs very well for the most part up to 12.5 psi. It still need tweaking but it's something I work on for a bit, get bored and come back to later after I've read a little more. I've read countless articles and post on details. I've read some thing like "you'll definitely flow more air at 100 kpa @ 3000 rpm then 90" but for me this isn't the case. I've smoothed out my VE table to have a constant upward tread (with small dips) but after doing that multiple times, my VE table constantly comes back to this major fall off at 100kpa or so. Whats the reason behind this?
5.3L truck engine with only LS6 valve springs, 76 mm turbo.
Tune 1 is my current tune.
Tune 2 is one that was given to me from a buddy who had a tuner do his car when I first got HP tuners.
They both have a dip around 0 psi manifold pressure. Is this something to do with the net 0 pressure between vacuum/boost causing neither a suction, nor pressure that leads to the fall off of the VE? Am I doing something wrong? I have a histo filter to only log with TPS is above 5% and even then I selectively pull out data from the log to input in the VE, then hand smooth the match around it. No copying and paste histograms very much. Learned very earlier on that I get a bunch of garbage.
Something actually related to fueling.
I think it's the increase of fuel pressure from my hobbs switch a 4 psi. I assume this isn't normal and I assume the regulator just can't deal with the instant pressure. Aeromotive a1000
Can someone explain to me the cause of the dip at 0 psi manifold pressure (1 atm or 14.7psi) in the tables? I've playing with HP tuners for around 3 years on and off tuning my own turbo car. My car is almost tuned and runs very well for the most part up to 12.5 psi. It still need tweaking but it's something I work on for a bit, get bored and come back to later after I've read a little more. I've read countless articles and post on details. I've read some thing like "you'll definitely flow more air at 100 kpa @ 3000 rpm then 90" but for me this isn't the case. I've smoothed out my VE table to have a constant upward tread (with small dips) but after doing that multiple times, my VE table constantly comes back to this major fall off at 100kpa or so. Whats the reason behind this?
5.3L truck engine with only LS6 valve springs, 76 mm turbo.
Tune 1 is my current tune.
Tune 2 is one that was given to me from a buddy who had a tuner do his car when I first got HP tuners.
They both have a dip around 0 psi manifold pressure. Is this something to do with the net 0 pressure between vacuum/boost causing neither a suction, nor pressure that leads to the fall off of the VE? Am I doing something wrong? I have a histo filter to only log with TPS is above 5% and even then I selectively pull out data from the log to input in the VE, then hand smooth the match around it. No copying and paste histograms very much. Learned very earlier on that I get a bunch of garbage.
Something actually related to fueling.
I think it's the increase of fuel pressure from my hobbs switch a 4 psi. I assume this isn't normal and I assume the regulator just can't deal with the instant pressure. Aeromotive a1000
Last edited by INSANEREINDEER; Oct 20, 2019 at 04:47 PM.
