Hesitation in boost and high rpm

Hey Guys,
I'm on the list for the next batch of pumps. I'm going into this without full confidence but feel like I'm too far in to back out. Of course there is no guarantee that the pump will magically fix the issue. I'm hoping that even if the issue exists, I'll never reach the point where the LMS pump would exhibit the issue. LMS also said that if the pump doesn't fix the issue, they would need the car for an extended period and fix the issue for an additional charge. I'm pretty gung hoe about buying the pump but would like your guys opinion.
 
polskifacet said:
yea that was the first batch, im talking about the second lol
Click to expand...

Interesting... I would have figured someone on this forum would have gotten one if there was a batch available...

I asked Anthony yesterday and he told me he was unaware of any HPFP being sold yet for the SHO... I have the email... lol

Oh well...
 
Just an observation, using the Torque app, with it being 75 degrees with some humidity it doesn't go below 1950 psi. I would have to log to get exact numbers but there is no hesitation etc.

Could any of you guys gauge how much fuel is missing? Is it 10% or is it 40%? That could help be make a better educated guess on the pump purchase.
 
polskifacet said:
Just an observation, using the Torque app, with it being 75 degrees with some humidity it doesn't go below 1950 psi. I would have to log to get exact numbers but there is no hesitation etc.

Could any of you guys gauge how much fuel is missing? Is it 10% or is it 40%? That could help be make a better educated guess on the pump purchase.
Click to expand...

What do you mean how much fuel is missing?
 
polskifacet said:
A guesstimate on how much more room the stock pump should have. I'm assuming that I'm on the bleeding edge right now.
Click to expand...

Rule of thumb from the tuners I have worked with is 1500 psi is the lowest you want to go.
 
StealBlueSho said:
polskifacet said:
A guesstimate on how much more room the stock pump should have. I'm assuming that I'm on the bleeding edge right now.
Click to expand...

Rule of thumb from the tuners I have worked with is 1500 psi is the lowest you want to go.
Click to expand...

for my education is that for sustained,  or at all costs?  I have seen mine dip into the 1400's on shift but had assumed that happens since there is reduced load and reduced rpm driving things.
 
TopherSho said:
StealBlueSho said:
polskifacet said:
A guesstimate on how much more room the stock pump should have. I'm assuming that I'm on the bleeding edge right now.
Click to expand...

Rule of thumb from the tuners I have worked with is 1500 psi is the lowest you want to go.
Click to expand...

for my education is that for sustained,  or at all costs?  I have seen mine dip into the 1400's on shift but had assumed that happens since there is reduced load and reduced rpm driving things.
Click to expand...

I can just say from my experience is that Brad and Torrie were not happy with a sustained pressure of 1500 or less...

That being said... more of the issue is the dips after a shift around 4K RPMs... usually that's when a boost spike is evident...due to the increase in boost from the spike along with the drop is fuel pressure you are more prone for knock/heat issues....

I have never had a tune besides an E blend on a non-e tune that would not recover the fuel pressure...

I have had pressure as low as 800 psi while playing around... the ECU closes the throttle to prevent damage at that level...

 
StealBlueSho said:
TopherSho said:
StealBlueSho said:
polskifacet said:
A guesstimate on how much more room the stock pump should have. I'm assuming that I'm on the bleeding edge right now.
Click to expand...

Rule of thumb from the tuners I have worked with is 1500 psi is the lowest you want to go.
Click to expand...

for my education is that for sustained,  or at all costs?  I have seen mine dip into the 1400's on shift but had assumed that happens since there is reduced load and reduced rpm driving things.
Click to expand...

I can just say from my experience is that Brad and Torrie were not happy with a sustained pressure of 1500 or less...

That being said... more of the issue is the dips after a shift around 4K RPMs... usually that's when a boost spike is evident...due to the increase in boost from the spike along with the drop is fuel pressure you are more prone for knock/heat issues....

I have never had a tune besides an E blend on a non-e tune that would not recover the fuel pressure...

I have had pressure as low as 800 psi while playing around... the ECU closes the throttle to prevent damage at that level...
Click to expand...

ok no worries for me then :) ty sir..
 
You don't want fuel pressure drops, even momentarily, below 1500 psi... but that's really up to your tuner and how comfortable he is with your car...
 
StealBlueSho said:
You don't want fuel pressure drops, even momentarily, below 1500 psi... but that's really up to your tuner and how comfortable he is with your car...
Click to expand...

RGR that,  AJP has not made a concern of it so i called it good. but it is good to learn as much as i can.
 
Since my fuel pressure is fine at 75ish ambient,
what does that say about the fuel system? The answer I'm looking for is how far off am I from a model tuned sho? My thinking is if im within 10% of a model tuned sho then there is nothing broken its just lazy and I can confidently grab the LMS pump and get those gainz lol. IIRC something like 40 hp is a nice bump.
 
polskifacet said:
Since my fuel pressure is fine at 75ish ambient,
what does that say about the fuel system? The answer I'm looking for is how far off am I from a model tuned sho? My thinking is if im within 10% of a model tuned sho then there is nothing broken its just lazy and I can confidently grab the LMS pump and get those gainz lol. IIRC something like 40 hp is a nice bump.
Click to expand...


wait ... is someone claiming a 40hp gain from a HPFP?  As in your tuned to the hilt alreasdy, then get a new pump and gain 40 MORE hp?
 
TopherSho said:
polskifacet said:
Since my fuel pressure is fine at 75ish ambient,
what does that say about the fuel system? The answer I'm looking for is how far off am I from a model tuned sho? My thinking is if im within 10% of a model tuned sho then there is nothing broken its just lazy and I can confidently grab the LMS pump and get those gainz lol. IIRC something like 40 hp is a nice bump.
Click to expand...


wait ... is someone claiming a 40hp gain from a HPFP?  As in your tuned to the hilt alreasdy, then get a new pump and gain 40 MORE hp?
Click to expand...

No, LMS has not released ANY information on the tuning of the new HPFP they are developing. They have said they will release information when the pump is available...

I have been on this like white on rice...
 
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