[mememe123]

Installed DW300Cs due to stock pumps loosing FP and now getting too much FP.
I can see commanded FP at ~73 and actual one is 80-93psi, at partial and WOT it dips down into ~.52 Lambda and below.
Never messed with FPCM on this thing, if anyone got pointers, it would be appritiated.
1050x, DSX Aux and Meth are the other fuel mods atm, as well as DW PRV.
Do I need to adjust Fuel Pump base DC ? or Open loop, or Regulation Pressure ?

 

[Jim]

I think Random and Adam112 have some helpful tips on adjusting pressures through the FPCM.

I had the same issue after installation the DW regulator and Pat G adjusted it down for me. If I had my tuning laptop here at work, I'd be able to help but in the meantime, check the Tuning section for Random's and Adam's notes.

 

[mememe123]

Yeah, I've been looking over that and trying to make sense of things.

 

[kittyboy]

Good thread on HPtuner (see images)

 

[mememe123]

Good thread on HPtuner (see images) View attachment 159089 View attachment 159090

Yeah. I'm about to mess with DC settings before I go to work.
I guess the problem is that I'm not too sure on the numbers.

 

[SeeTeaS-V]

I don't have the answer, but you should add fuel injector flow rate to your logs. The FPCM uses injector flow rate to control the HIGH/LOW flow modes. Those Flow modes command different fuel pressures. Maybe since your new pumps flow more, the injectors are flowing more and your FPCM is commanding a different mode. Just a thought.

 

[mememe123]

I can't seem to find injector flow rate channel.
I played with open loop DC and DC Multi earlier, and it made a difference. Did not log, but partial throttle/low boost was in .76-78 area and after that it went to .82 at 4k/wot. So I bumped DC multi back up 5℅ and same with higher flow cells in open loop DC, and going to do a log in a bit.

And disregard. Got the injector flow rate added.

 

[kittyboy]

I log injector flow, injector duty, adv fuel flow, instantaneous fuel flow, fuel pump duty, actual fuel pressure, desired fuel pressure. These have really helped with monitoring and making changes. I'm running the DW300c pumps with ID1050x, 80-90 PRV and found that the higher flow rate pumps and injectors run well at 40psi fuel pressure for low and normal, 50psi for high flow. I modified my flow conditions table as well. Didn't really see any improvement changing the stock DC tables in the FPCM in my set-up, just changed the pulse width, flow rate table, and fuel pressure. The lower fuel pressures respond well using the upgraded pumps and injectors, pressure and flow are proportional, so it's easier on the system. WOT I never exceed 80 duty cycle on the injectors and always have plenty of flow available, pumps usually never require 100% even at 16lbs boost 100% pedal, AFR is between 10.5-11 at WOT, 92 pump

 

[mememe123]

Any pointers on what you changed in pulse width and flow rate ? (Unless you talking about id1050x data)
I changed cranking to 414kpa idk if its going to help with FP spike. And still getting random high FP right after wot (85-90psi).
I'm gonna go to unmolested tune (prior to dw300) and adjust pressures like you said.

 

[kittyboy]

This has worked out very well for me, you should never see any more spikes. I have disabled VVE,
MAF only. I assume you have already updated all the tables from Injector Direct?

 

[mememe123]

This has worked out very well for me, you should never see any more spikes. I have disabled VVE,
MAF only. I assume you have already updated all the tables from Injector Direct? View attachment 159094 View attachment 159095

Thanks ! I'm gonna give it a go.
And yes, everything else has been good, I've had relatively the same tune for a while now.

Now, we are not messing with injector Flow rate vs Press table in the ecm, just the FCM ?

 

[kittyboy]

Thanks ! I'm gonna give it a go.
And yes, everything else has been good, I've had relatively the same tune for a while now.

Now, we are not messing with injector Flow rate vs Press table in the ecm, just the FCM ?

Correct, the FPCM maxes out at at 63.5 lbs per hour, not possible to increase value past the 63.5. The similar table in the ECM can go higher, but not the FPCM

 

[SeeTeaS-V]

I just realized you also have the DSX AUX pump. Are you running ethanol? What are your mods, or about how much power are you trying to support?

[asking for a friend who will need fuel mods soon]

 

[random84]

I have a detailed thread in this subsection somewhere where I went through my process.

Something to remember, the FPCM has "trims" that to my knowledge you cannot reset or clear. So every change you make I'd give it a day or two of driving before making more changes.

Also, the pulsewidth settings are manipulated by some variable also not in HPTuners, so don't get hung up on absolute values in the FPCM tables. Think more in terms of percent change until your logs get to where you want them to be.

You can adjust pump voltages and increase output, but you will fry the module.

Sent from my SM-G991U1 using Tapatalk

 

[mememe123]

I just realized you also have the DSX AUX pump. Are you running ethanol? What are your mods, or about how much power are you trying to support?

[asking for a friend who will need fuel mods soon]

Yeah, Flex, DSX AUX, 1050x, now DWs, GP 2.5, 2.45/8.6, Meth.
Stock pumps were OK, up intill a few weeks ago, when I realized my wot FP was going down, so I went with DWs.
Power wise, it made ~705 on MD

 

[random84]

Here's some of my FPCM tuning experience:

Vaporworx Ally fuel pump controllers for the CTS V2 (and...

I think I have another post on the high / low pressure mods in a different thread or in my build thread.


ETA: here it is:
https://www.ctsvowners.com/index.php?posts/2536774

Sent from my SM-G991U1 using Tapatalk

 

[mememe123]

Feels a lot better with those changes, however my IDC is maxxed out now. I wonder if I should up the FP or if my AUX us not turning on now ?
Still going pretty rich once meth kicks in at 6psi.

@random84 I'll check it out

 

[random84]

Edit: you're getting 50psi at full beans it looks like.

You'll want to be ~60psi. The fuel pumps are more efficient at lower line pressures, but higher pressures offset injector flow limits. If you can maintain the fuel line pressure at high RPM, then it buys you more headroom on injector duty cycle.

If you're running the OEM fuel pressure regulator, I think it starts to bleed pressure at 63psi, and raising pump duty cycle will not help. So, try 60psi in high flow mode and that should drop your IDC by 10% or so.

You should also log IAT2, as it's actual manifold air Temps. IaT1 is basically ambient.

You could also lean it out more to .78-.8 lamba, and slightly less timing.

You're running a lot of timing (successfully) at 6500 RPM, which tells me those stock heads are not very efficient. But it is what it is!

Sent from my SM-G991U1 using Tapatalk

 

[mememe123]

I have DW FPR 90psi, or whatever it is. I'm gonna try your settings for desired fuel pressure, they look pretty close to the ones I had before.

 

[SeeTeaS-V]

The DSX Aux pump is not coming on. Make sure you have the MAP sensor connector on correctly.
IT CAN GO ON BACKWARDS.