That's phenomenal! Don't know many places that offer that kind of customer service. LMS definitely just went up a few notches in my book.
Hesitation in boost and high rpm
- Thread starter polskifacet
- Start date
Is that datalog from the dyno you did?
polskifacet
New member
Not from the dyno, no. I do however still have massive hesitation when it downshifts during WOT. Concerned that they said it safe when there is no way this is healthy.
polskifacet said:
Do you have a data log of the hesitation? Sounds like throttle closing...
polskifacet
New member
I would have to go through my email. IIRC the hpfp goes under about 1200 psi when I notice the hesitation. Feels like it has no power.
Oh, still same issue persists then. No worries about a log. Hope they can figure it out!
polskifacet
New member
Had an open piece of road to do some testing on. It seems like it struggles at lower RPM to meet fuel demand. If i floor it at a higher speed and its going through the gears, it is meeting desired HPFP, up shifted from 3rd to 4th and good fuel pressure through all of 4th.
polskifacet said:
We are getting to warmer weather now which helps with the fuel pressure issues... less dense air...
Ramairetransam
New member
StealBlueSho said:
mine seems like it does it at the top of 2nd and no other gear or place . My torque app shows 2 degress of knock . running 93 from a top tier place with new plugs
polskifacet
New member
StealBlueSho said:
It was 50 last night. I've logged in the 60's and still have low pressure. If the pump can keep desired at 140 mph WOT , how is something wrong with it?
I thought you said at lower rpms? I am confused... so I am guessing that a 0-60 pull is when you still have issues? Maybe I am misunderstanding?
polskifacet
New member
StealBlueSho said:
0-60 or pretty much any time it downshifts @ WOT
And LMS said to not worry about the drop in FP and accompanying hesitation?
polskifacet
New member
From what I understand LMS put a fuel pressure gauge on it and ran it on the dyno, came out ok.ZSHO said:
polskifacet
New member
Yes this is what they said.StealBlueSho said:
polskifacet said:
That is phenomenal.... did you ever monitor your STFT when this hesitation occurred? I can mail you out my spare HPFP to test a different fuel pump if you want... I would like it back though.
polskifacet
New member
StealBlueSho said:
After experiencing the hesitation I was fairly pissed as I would have expected them to just turn down my tune until they find the root cause. I am on my second HPFP as it came with the long block but thanks for the offer bud. Logging with AJP the STFT were ok.
Hmmm... how low was your fuel rail pressure getting, do you remember? I have had mine drop to 800psi before and it hesitated/shuddered until the pressure came back up.
polskifacet
New member
StealBlueSho said:
Anything under about 1200 psi starts causing issues. The lowest I have seen mine go is 6 mpa / 900 PSI.