Initial drop in RP
Looking at my logs in HP Tuners I am having a problem dropping rail pressure for a second as I launch from 25% to 100% throttle. I have been told to drill the feed port on the rail a little larger as my PPE dual pump kit just Ys into the stock feed location and is not a dual feed to the rail. I have also been told to adjust the FCA amperage I believe in my tuning, but I am unsure what to set it at... anyone have some suggestions?
I just have a hard time getting on top of my charger from under 20psi of boost, thought maybe getting some more pressure would help get it going as there is about 5000psi difference between my desired pressure and actual. Fueling is: 125% over injectors Drilled 6.7 feed tubes PPE Dual pump kit. 10mm stroker on bottom, stock dmax pump up top. Dual Airdog 165s |
These are two different logs, where I changed the defueling limits for RPM, but if you look at the bottom row on both logs in green and blue lines you can see the initial drop in RP.
https://uploads.tapatalk-cdn.com/201...5678626e90.jpg |
You have the regulator minimum duty cycle set close to zero? You could try setting the voltage graph to zero on the last data point (at max fuel flow).
Have you logged the duty cycle to see if it commands a low value off the hit? Could be something to adjust in the pid tables too but that can be easy to screw up. There should be slow and fast gain adjustments. |
Are you running Stock DC Base map?
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Yea Duty Cycle base map is where I would start. The FCA Amperage will help on the big end when pressure is starting to drop but on the tip in, base DC will help.
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Okay, I will take a look at those tonight. Thanks everybody
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Okay, I have tried messing with the tuning and nothing has made a difference. Still has a 5-6000k psi drop when i first go to 100% throttle.
I am thinking about changing my dual pump kit to one that feeds the rail in two spots or using one of those flexible dual feed lines II sells. |
Probs won’t make a difference where/how many holes you feed the rail with. Lots of huge hp are single feeding 6.7 rails with much success, including me, except for the huge hp part :)
fwiw the updated fleece dual pump kit for a 6.7 uses the gear driven pump as the distribution block instead of two extra lines and a sensor block like you usually see in the ATS and old fleece kits, and just feeds the rail at the single stock location |
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What does the FCA amps drop to when you have the drop in rail pressure? In the data log does the curve of the FCA amps match the drop in rail pressure?
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I got some triple Cp3's that'll solve your problem.....lol
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If it's a tuning problem you will see the fca amps go to a set amount as the actual rail pressure continues to fall. Posting a pic of the graphs like you did above including the fca amps would be best. Paul |
Just out of curiosity, do you know the pressure from the airdogs to the hp pumps? Possible the airdogs pressure cant react fast enough with the fuel demand?
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FCA DC Actual FCA DC Desired FCA Current FCA Volts Which ones should I log? |
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