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s5fourdoor
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« Reply #120 on: April 13, 2012, 03:42:26 PM »
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It can totally be controlled by the n75
a PID is VERY flexible, i strictly believe this to be correct... |
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marcellus
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« Reply #121 on: April 13, 2012, 05:54:56 PM »
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I figured it could be
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marcellus
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« Reply #122 on: April 15, 2012, 05:32:29 PM »
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It can totally be controlled by the n75
Ready whenever you are. |
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marcellus
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« Reply #123 on: April 16, 2012, 08:44:18 AM »
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Time for the new FMIC  |
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marcellus
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« Reply #126 on: April 21, 2012, 10:40:26 PM »
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Today was Interesting. I was playing with different ways of manually controling the VGT. I tried to add springs to the Actuator to slow its movemenmt, but when I applied about 15 psi it just shot open. Damn actuators are pretty strong. I even tried a spring only and let the drive pressure open the VGT on its own. It worked this way, but apparently the drive pressure was a bit much for the springs I had and spool was hurt pretty bad.
I finally reinstalled the actuator and connected the N75 to it and left the wastegate without a reference line. WOW! now that was nice. With no changes to my file. The spool was really smooth, and the boost stopped right at around 17-18 psi. I guess when the VGT is opne all the way it actually can stop spool and the N75 did an awesome job holding it steady. It was pretty amazing. I am going to run a MBC on the wastgate as a security precaution.
Since my wastegate actuator is ~7psi, I think I will be looking at a stg 2 style KFLDRL map. The N75 is set too low right now and boost isnt meeting requested yet. I think I can increase the duty cyke on the low end to keep the vgt closed longer and help keep the turbo spooling.
Log attached. Comments welcome.
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jibberjive
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« Reply #127 on: April 21, 2012, 11:19:15 PM »
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Interesting. So if I read that right, if you were to run the wastegate clamped shut, the VGT clamed as open as it goes, the 2.7t will only be able to spool it to 17 psi by redline? Have you tried it in that configuration before (wastegate shut, VGT wide open always)?
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marcellus
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« Reply #128 on: April 22, 2012, 01:14:25 AM »
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With no boost reference to my Tial 38mm wastegate the actuation of the VGT vanes have been sufficient enough to control boost...TODAY. With the VGT held in the closed position boost will ramp up very fast and will keep going until I let off. We found that out a few pages ago. On the order of like over 25psi IIRC by 4k-ish before I let off.
With the VGT open all the way the thing doesnt even start to spool until around 5k. I Think it was making around 10 psi around 6.5k-ish. Also, in the stock configuration, the vehicle this turbo is from doesnt use a wastegate. Boost is regulated by the vanes. Also all the way closed down can serve as an exhaust brake, which I have come acroos a couple times while trying to adjust the starting point for the VGT.
When I have the VGT shut tight, the car kind of sounds slightly louder than stock at idle. That is something I actually like and is what I shoot for when setting the minimum position. Another benefit of this very small setting is the K03 with a MBC type of spool/ramp up. I have had it spooling around 2.5k before, but it was very hard to keep it from going to a exhaust brake type of position between shifts, when the actuator slams the VGT closed.
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jibberjive
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« Reply #129 on: April 22, 2012, 04:06:07 AM »
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I didn't know the car that came on stock didn't use a wastegate, hence I was curious of the upper flow limit when all the way open (ie if the motor isn't physically capable of spinning it higher than you want at redline). Sweet, that'll be cool to run wastegate-less essentially (only wastegate for overboost protection). I really like this idea, and I hope you find an ideal way to control the VTG.
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Snow Trooper
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« Reply #130 on: April 22, 2012, 02:51:41 PM »
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Glad you are on the right track.
Jib these come on cummins.
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cartoons?
6A 61 72 65 64 40 76 6C 6D 73 70 65 63
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jibberjive
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« Reply #131 on: April 22, 2012, 03:16:28 PM »
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Jib these come on cummins.
Yeah, I looked into them a couple pages back, but I didn't know the cummins didn't use a wastegate. Big displacement and no wastegate, that's saying something about the size of the turbo lol. |
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marcellus
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« Reply #132 on: April 22, 2012, 03:23:15 PM »
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I think they also have the fact that they only rev to like 3k.
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marcellus
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« Reply #133 on: April 22, 2012, 03:42:37 PM »
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I am trying to figure out my pid mapping. Do you think I should bump all the values up into around 4.5 k, and taper them off going to the right? Higher values on the left and smaller to the right?
I am Trying to keep it closed as long as possible and open it at over 4.5kish and hold 25psi.
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jibberjive
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« Reply #134 on: April 22, 2012, 03:54:58 PM »
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I am trying to figure out my pid mapping. Do you think I should bump all the values up into around 4.5 k, and taper them off going to the right? Higher values on the left and smaller to the right?
I am Trying to keep it closed as long as possible and open it at over 4.5kish and hold 25psi.
Which specific maps are you talking about? |
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