Hesitation in boost and high rpm

Anyone have an idea on how to do a flow test? Hooking up the gauge to the Schrader valve and keeping the bypass open to a measuring container is fairly simple but how about energizing both pumps at 100% output? LMS is going to talk about my issue with their staff tomorrow, I am trying to gather required tools for testing what they may come up with for what to check.
 
I dont know how you would control or test 3000 psi of potential pressure without pro tools.  I suppose you could probe the wiring and inference that way, still a far cry from direct measurement.  Maybe some diesel guys have insight.
 
If you are going off the schrader valve that would be testing the LPFP....

Went I tested mine, I just tested the PSI output with a fuel pressure test kit. We hooked it up to the Schrader valve, snaked the line out of the top of hood, through the passenger windows, and my buddy held it in the passenger seat.

We did remove the cowl to fit the line through.


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HPFP keeps pressure on the stock tune so I will assume it is fine since its the same issue with 2 different HPFPs. I talked to a friend that has a mechanic shop, he's on vacation but next week I can go over there and we can hook up a line to the schrader valve and energize the in-tank pumps with his fancy diagnostic scan tool. He mentioned that they should both energize by jumping the relay but using the scan tool is easier.
 
Decided to swap the LPFP, might be able to do it tonight. That way it's 100% sure that component cant be checked off the list. Only part left are the actual lines (unlikely) which would be a visual inspection and potentially that flow test and then it would fall back on software.
 
Good luck!!! I would rent a fuel lock ring wrench... it will save you a butt load of time... talking from experience..


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Any difference here? I am not sure which one I am getting but I think my car falls under the PS-944 vs PS-1024
fuelpump.jpg
 
polskifacet said:
Decided to swap the LPFP, might be able to do it tonight. That way it's 100% sure that component cant be checked off the list. Only part left are the actual lines (unlikely) which would be a visual inspection and potentially that flow test and then it would fall back on software.
Click to expand...
Did I miss something in the log?

Looked like it was keeping up fine.
 
polskifacet said:
LMS said to check it, I'm just going to change it to minimize push back.
Click to expand...


I went down the same path with Unleashed... LPFP, HPFP, FPDM... about $700 worth of parts.. luckily I am mechanically inclined so I didn't pay for installs...


However... that being said.. my car does not support pids for LPFP information... maybe the saw something...

Good luck! If you have any questions about the LPFP swap feel free to PM me.


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StealBlueSho said:
polskifacet said:
LMS said to check it, I'm just going to change it to minimize push back.
Click to expand...


I went down the same path with Unleashed... LPFP, HPFP, FPDM... about $700 worth of parts.. luckily I am mechanically inclined so I didn't pay for installs...


However... that being said.. my car does not support pids for LPFP information... maybe the saw something...

Good luck! If you have any questions about the LPFP swap feel free to PM me.


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Click to expand...
IIRC, It was like 4 psi from what was commanded. And that was well after the rail crapped out.



 
I know it looked good, but I also need to get my side taken care of ASAP before too much time passes and the fire under LMS's butt dies down. At least I hope they notice I am serious about fixing the issue and not just being a support leech.
 
polskifacet said:
I know it looked good, but I also need to get my side taken care of ASAP before too much time passes and the fire under LMS's butt dies down. At least I hope they notice I am serious about fixing the issue and not just being a support leech.
Click to expand...
PM sent
 
polskifacet said:
Anyone once else able to post logs of wot with 30f or lower IAT temps with LMS or other tune?
Click to expand...

Ill post some cold weather logs when I get home, AJP tunes, various revisions.

Edit: No sense in posting them twice, thrice etc.

My logs can be found here:

Basic cold weather logs, may not have WOT but has steady state in cold temps.

http://www.ecoboostperformanceforum.com/index.php/topic,7285.msg111245.html#msg111245

Here is a plethora of my logs (Most likely you will want to look at the Rev21 logs that are attached, they were logged in 20 degree ambient or so)

http://www.ecoboostperformanceforum.com/index.php/topic,7288.msg111148.html#msg111148

Enjoy
 
polskifacet said:
Anyone once else able to post logs of wot with 30f or lower IAT temps with LMS or other tune?
Click to expand...

That cold is going to put stress on your fuel pressure for sure.


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StealBlueSho said:
polskifacet said:
Anyone once else able to post logs of wot with 30f or lower IAT temps with LMS or other tune?
Click to expand...

That cold is going to put stress on your fuel pressure for sure.


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Click to expand...

I want to say my IATs are usually ~30 deg warmer than ambient, so 30 IAT would be 0 ambient, cold for sure. And at those temperatures, heck at any temps under 40 or so, transmission takes a lot longer to warm up and is jerky and jumpy anyway because the fluid is cold.
 
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