HPFP

[redsand]

Hey guys,

For those of us with the 3.5TT motor, what is the HPFP's max psi?  I thought I read somewhere in the neighborhood of 2500psi.  Anyway I was doing some digging around and found one on the net that peaks at 2900.  I thought it was maybe a little promising if my memory was correct.  Not sure what an extra 400psi would give us for room in power but it's a start?

 

[jomc111]

Its not necessarily more psi that will help but the ability to hold psi at the injectors max flow. With that being said a pump that can make more psi in theory may be abke to hold psi longer. Post up the pump you found and did you make sure it is the same style pump the f150 and sho ones are different

 

[redsand]

Here's a link to it, I don't know that it will work for any of our platforms but its cam driven and delivers more so I was hoping.....

http://delphi.com/manufacturers/auto/powertrain/gas/injsys/p-gdi-h-p-fuel-pump/

They also have complete fuel set ups but I don't know if this is available to the average joe either.

 

[EcoBrick Bob]

Even with my KB Boost a pump, I saw FRP drop below 1,000 PSI a couple times.  Key is what happens to your Lambda readings (Air Fuel ratio as a % of normal)  Never want to be over .82 for more than a split second with our boosted engines.  Fuel volume at adequate PSI is more important than total PSI... 

 

[redsand]

For the most part when logging my truck I see .80-.82 lambda. I haven't noticed a PID from SCT that logs FRP, am I missing it? I would like to see if it loses pressure up top. I've heard that the trucks pump maintains pressure clear to red line but I don't have any definitive proof that's correct.

 

[4DRHTRD]

Bob sent me a log showing FRP from an earlier version of Livelink, I'll have to look again when I get my car back but I was never able to see it. He said to monitor rear fuel pressure PID.

 

[EcoBrick Bob]

It is "rear fuel pressure" and there is a conversion formula for it and many of the PID's like TIP to boost etc.  The one I still haven't figured out is MCT which is certainly the most important "Temp" reading.  I will post a link to the formulas that I got from Torrie later this AM.  I will also post a link that Torrie sent me for you to download LiveLink 6.5, which is an earlier version of this software that has formulas calculated for the info we like to log.  Only issue with it is that it can be glitchy and sometimes doesn't re-start without hassles. That's a big deal when you are turning vehicle on and off at the strip while working your way to the lights.

I  was contacted by the person at SCT who trouble shoots their software, so  if any of you have pertinent questions that the SCT  software programmer can answer, let me know and I'll try to get you the info. My issue with the newest LL was that it would not log analog inputs, which I need for A/F in my G8, as I had to add an Innovate Wide Band to get that info. GM doesn't provide that output thru OBDII. This is a software glitch.