p-pump conversion
06-21-2003 | 05:16 PM
#2
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Re:p-pump conversion
JetPilot has done it. I know he likes it a lot. A lot more power to be had. It's VERY expensive and it's VERY involved in swapping it out. BUT, you can rev to 4K if you want (although the retainers to do it are like $1300 and only one guy is making them right now) and it is more reliable than the VP44, not to mention easier to work on. It can also supply around 4x more fuel than the VP44 can.
06-21-2003 | 07:47 PM
#3
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Posts: n/a
Re:p-pump conversion
Downsides?
1. Poor resale value - perhaps UNsaleable if your state has strict emission laws, your truck will NOT be emission legal with that conversion! (have you checked fines for emissions tampering? how does $25,000 sound to ya?)
2. MUCH less flexible that the VP-44 it replaces, which is pretty much infinitely adjustable in timing and volume, unlike the P pump which is pretty crude and fixed in adjustment by comparison.
While there are a significant number MORE failures of the VP-44 than the older, purely mechanical pumps, MOST of those are directly related to prior or simultaneous failure of the notorious lift pump - and THAT failure is pretty easily reduced or avoided by the simple and relatively inexpensive addition of a pusher pump or similar mod that insures a steady and adequate fuel flow TO the VP-44...
WHY toss the baby out with the bath water - the VP-44 gives ALL the instant, fully flexible, on-the-fly adjustability most of us could only DREAM of a few short years back - and it's weaknesses aren't that difficult or expensive to correct. ;D ;D ;D
1. Poor resale value - perhaps UNsaleable if your state has strict emission laws, your truck will NOT be emission legal with that conversion! (have you checked fines for emissions tampering? how does $25,000 sound to ya?)
2. MUCH less flexible that the VP-44 it replaces, which is pretty much infinitely adjustable in timing and volume, unlike the P pump which is pretty crude and fixed in adjustment by comparison.
While there are a significant number MORE failures of the VP-44 than the older, purely mechanical pumps, MOST of those are directly related to prior or simultaneous failure of the notorious lift pump - and THAT failure is pretty easily reduced or avoided by the simple and relatively inexpensive addition of a pusher pump or similar mod that insures a steady and adequate fuel flow TO the VP-44...
WHY toss the baby out with the bath water - the VP-44 gives ALL the instant, fully flexible, on-the-fly adjustability most of us could only DREAM of a few short years back - and it's weaknesses aren't that difficult or expensive to correct. ;D ;D ;D
06-22-2003 | 03:25 AM
#4
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Joined: Oct 2002
Posts: 17
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Re:p-pump conversion
I had it done. But unless you are willing to go all out and do everything else, don't bother.
Larry Crawford did it. Don't Know him, but am unsure from his postings on other sites if he got all the bugs out. I also know of a couple others besides the obvious who have had it done and most of us don't post.
Unless you're going for very high rwhp or pulling sleds, don't bother. You'll wonder why you spent so much money. If money is no object and you have other cars to drive, there is some very cool and serious stuff out there being developed way beyond anything you'll ever see posted on the internet.
Larry Crawford did it. Don't Know him, but am unsure from his postings on other sites if he got all the bugs out. I also know of a couple others besides the obvious who have had it done and most of us don't post.
Unless you're going for very high rwhp or pulling sleds, don't bother. You'll wonder why you spent so much money. If money is no object and you have other cars to drive, there is some very cool and serious stuff out there being developed way beyond anything you'll ever see posted on the internet.
06-22-2003 | 12:16 PM
#5
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Joined: Apr 2002
Posts: 1,250
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From: Hershey, PA
Re:p-pump conversion
Cabrokr is correct. This is an "all out" application only. Larry Crawfords truck is running well now but he had to put a highly modified Piers pump on for it to perform the way he wanted. If max performance is what you are seeking and you don't mind doing your own tuning then I would give it serious consideration. However if you are looking to just have a simple everyday driver look the other way....<br><br>Doug
06-23-2003 | 10:41 AM
#6
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Joined: Mar 2003
Posts: 538
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From: the shop
Re:p-pump conversion
I guess Im trying to make my truck just run smoothly
with 400 rwhp
I have been fighting a stumble problem for 9 months now
spent a lot of money and replaced everything that could possibly be causing it and I still have a problem
no one can fix this thing so far
p - pump conversion is cheaper than trading it for a new one
ps. im not affraid of adjusting or tinkering
thats all ive done with this piece of junk since I got it a year ago
with 400 rwhp
I have been fighting a stumble problem for 9 months now
spent a lot of money and replaced everything that could possibly be causing it and I still have a problem
no one can fix this thing so far
p - pump conversion is cheaper than trading it for a new one
ps. im not affraid of adjusting or tinkering
thats all ive done with this piece of junk since I got it a year ago
06-23-2003 | 12:43 PM
#7
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Joined: Apr 2002
Posts: 1,250
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From: Hershey, PA
Re:p-pump conversion
Agades,<br><br>You may be surprised but a P-pump conversion may not be cheaper than trading in you truck. What type of stumble occurs? Is it associated with rpm, vehicle speed, cold vs. hot, etc. What mods do you currently have? <br><br>Getting a great running 400 HP 24v is easy..... There are a lot cheaper ways to do it than the conversion. <br><br>Doug
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06-23-2003 | 05:30 PM
#8
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Joined: Mar 2003
Posts: 538
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From: the shop
Re:p-pump conversion
the stumble always shows at 59 mph with light acceleration and a small load (about 8-12 psi boost) in 5th gear
worse in extreme temps hot or cold
never at WOT acceleration
sometimes it stumbles at all speeds when Im pulling my trailer and using the pedal
the cruise will eliminate most of the stumble
acts just like a loose connection but only certain conditions
every time I do something under the hood the problem goes away for a while then comes back
theres a 01.5 in town with the same symtoms so it would be great to kill two birds with one stone
tried:
DD ufm
edge comp
pm 3 (running this now)
new pcm
new VP
ecm reflash (by cummins but still a dodge program)
APPS
new cam sensor (02 doesnt have crank sensor)
checked voltage on MAP and IAT
new injectors (dd 2)
cleaned all connectors under hood
changed from BC pump cover to PM grabber
checked grounding points (as much as I could find)
fuel filters
fuel press never goes below 6 psi (have mechanical gauge)
running 3/8" fuel lines (didnt expect this to change anything because its not a WOT problem)
only thing I can think of that I havent tried is a completely different ECM and I do have one on its way
If anyone can fix this they will be my best friend :-*
worse in extreme temps hot or cold
never at WOT acceleration
sometimes it stumbles at all speeds when Im pulling my trailer and using the pedal
the cruise will eliminate most of the stumble
acts just like a loose connection but only certain conditions
every time I do something under the hood the problem goes away for a while then comes back
theres a 01.5 in town with the same symtoms so it would be great to kill two birds with one stone
tried:
DD ufm
edge comp
pm 3 (running this now)
new pcm
new VP
ecm reflash (by cummins but still a dodge program)
APPS
new cam sensor (02 doesnt have crank sensor)
checked voltage on MAP and IAT
new injectors (dd 2)
cleaned all connectors under hood
changed from BC pump cover to PM grabber
checked grounding points (as much as I could find)
fuel filters
fuel press never goes below 6 psi (have mechanical gauge)
running 3/8" fuel lines (didnt expect this to change anything because its not a WOT problem)
only thing I can think of that I havent tried is a completely different ECM and I do have one on its way
If anyone can fix this they will be my best friend :-*
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