Hesitation in boost and high rpm

AJP turbo · March 31, 2017, 01:38:56 PM

So what was wrong with your fuel system?

StealBlueSho · March 31, 2017, 02:06:31 PM

Quote from: AJP turbo on March 31, 2017, 01:38:56 PM
So what was wrong with your fuel system?

Interesting your fuel pressure never hits target still... stay below 1900psi through the entire run... I have noticed on my datalogs, if I do a low rpm pull starting around 2500rpms in third like this datalog, I am able to hit target fuel pressure for 2200psi+..

****EDIT: Maybe the almost freezing temperature had a lot to do with the above statement...

I wonder what your datalog would look like from a dig...

Curious myself what LMS was able to find...

polskifacet · March 31, 2017, 02:55:50 PM

Quote from: AJP turbo on March 31, 2017, 01:38:56 PM
So what was wrong with your fuel system?

From what I understand, it shouldn't be mechanically faulty at this point in time or they would have seen/taken apart more. LMS is digging deeper into the issue.

StealBlueSho · March 31, 2017, 02:58:07 PM

Quote from: polskifacet on March 31, 2017, 02:55:50 PM
Quote from: AJP turbo on March 31, 2017, 01:38:56 PM
So what was wrong with your fuel system?
From what I understand, it shouldn't be mechanically faulty at this point in time or they would have seen/taken apart more. LMS is digging deeper into the issue.

Did they charge you for this?

polskifacet · March 31, 2017, 03:05:12 PM

Quote from: StealBlueSho on March 31, 2017, 02:58:07 PM
Quote from: polskifacet on March 31, 2017, 02:55:50 PM
Quote from: AJP turbo on March 31, 2017, 01:38:56 PM
So what was wrong with your fuel system?
From what I understand, it shouldn't be mechanically faulty at this point in time or they would have seen/taken apart more. LMS is digging deeper into the issue.
Did they charge you for this?

Not a penny, and had a chauffeur take me to the Ford Museum and back lol. Also sporting a earned Livernoise license plate bracket.

StealBlueSho · March 31, 2017, 03:24:01 PM

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.

StealBlueSho · April 01, 2017, 07:06:47 AM

Is that datalog from the dyno you did?

polskifacet · April 01, 2017, 05:21:50 PM

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.

StealBlueSho · April 01, 2017, 06:43:02 PM

Quote from: polskifacet on April 01, 2017, 05:21:50 PM
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.

Do you have a data log of the hesitation? Sounds like throttle closing...

polskifacet · April 01, 2017, 07:30:59 PM

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.

StealBlueSho · April 01, 2017, 07:47:55 PM

Oh, still same issue persists then. No worries about a log. Hope they can figure it out!

polskifacet · April 03, 2017, 10:58:28 AM

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.

StealBlueSho · April 03, 2017, 11:00:23 AM

Quote from: polskifacet on April 03, 2017, 10:58:28 AM
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.

We are getting to warmer weather now which helps with the fuel pressure issues... less dense air...

Ramairetransam · April 03, 2017, 11:18:05 AM

Quote from: StealBlueSho on April 03, 2017, 11:00:23 AM
Quote from: polskifacet on April 03, 2017, 10:58:28 AM
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.

We are getting to warmer weather now which helps with the fuel pressure issues... less dense air...

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 · April 03, 2017, 11:19:35 AM

Quote from: StealBlueSho on April 03, 2017, 11:00:23 AM
Quote from: polskifacet on April 03, 2017, 10:58:28 AM
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.

We are getting to warmer weather now which helps with the fuel pressure issues... less dense air...

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?