Engine/Transmission (1998.5 - 2002) VP pump + cut delivery valves = ?

[RHARVEY]

Take the pump in the house where its warm... like the dinning table...



Rick

 

[Turbo Tim 1]

Matt,



Just bolt the kitchen table to the floor and then mount your vise on it, that will probably do the trick!

 

[HoleshotHolset]

I'm pretty sure I wouldn't get my security deposit back if I bolted a vise to the countertop... .



Matt

 

[Diesel Freak]

Just making a post so I can keep an eye on this one.

 

[woodsrat]

security depoist tell them it was in the name of research... LOL

 

[BWillard]

Knowing that the VP44 is a little more fragile than an inline P pump, what do you think this would do for reliabilty? No warranty on my truck so I'm game if this works!



Keep us posted!!!!!

 

[csutton7]

well the souped up VP's that I know about have had reliability probs--not sure if they've been worked out or not--chris

 

[HoleshotHolset]

I'm not playing with the problematic plunger area... .



For now, I'm only souping up the delivery valves... this should in NO WAY affect reliability... . all it does is allow more fuel to flow out of the pump's distributor section.



I could be wrong, though. Someone could have tried this already and it could have failed miserably. Nobody is speaking up... .



OR - someone tried it... . and it worked fantastic. Nobody is paying me off to keep quiet...



I'm willing to give it a whirl...



Matt

 

[Gary - K7GLD]

"well the souped up VP's that I know about have had reliability probs--not sure if they've been worked out or not--chris"



HMMmmm - you might elaborate on that a bit Chris - are you speaking of the types sold by guys like Piers or experimental ones done by private parties - and are you talking about pumps used in competition, or primarily street-driven stuff?



I had sorta thought that if I ever needed a replacement VP-44, the "beefed up" ones might be the smart way to go - but so far, haven't heard even the slightest info as to what is actually involved in "improving" on what Bosch has already done...

 

[98rammer]

the vp's run at lower pressure right? will modifying the delivery have any affect on hp with less pressure than the p7100... or just relative to the injector pop off #?



how would a Vp-44 make the german yelow roller skate run using only 4 of the lines?



Tom

 

[JDailey]

Trust me... . you're not the first.

 

[csutton7]

the souped up VP's need to be broken in for like 3000 miles with normal driving--no hotrodding or events--and even after that they don't hold up---now this is from last summer, but I've yet to hear anything different, so maybe things have changed, but again I haven't heard they've changed----so just beware and do your homework---chris

 

[HoleshotHolset]

Tom: The German roller skate uses a VP-37... which is a first cousin of the VP-44. Catch my drift?



I'm not messing with injector pop pressure.



Matt

 

[98rammer]

Originally posted by HoleshotHolset

Tom: The German roller skate uses a VP-37... which is a first cousin of the VP-44. Catch my drift?

you using a fueling box yet?Oo.

 

[DPugh]

Van Haisley put modified DV's in the truck that is now for sale, Patty said they had to dyno one with just the DV's so they could justify the cost of putting cut valves in the VP as Van upgraded the lines and connector tubes at the same time and wasnt sure of the gains of the DVs alone, and they never had any problems with the pump. She said it was a costly and time consuming operation, and there isnt a truck there under 500 horse so they cant dyno it unless they use Scheids engine dyno or find one elsewhere that can hold 500+ She told me it wont be too long before they do dyno one to find the gains, but as I found out they are overwhelmed with business and you are lucky to even get a call into their shop, so it may take some time. I look forward to see how things turn out. Good luck Matt, hope it turns out for you.

 

[HoleshotHolset]

Tom: Yes, I am using a 'fueling box'... . although it only cost me $1. 79 in parts. My modification does the same thing as a fueling box... it's a little crude... but it works like a sonofagun! As it is now... I need a bigger boost gauge (and a bigger turbo... )... the 30psi Autometer just ain't cutting it anymore. :-laf



DPugh: Out of curiousity... . Why is it so hard to find a dyno that will go beyond 500hp?



Thanks for the positive input. I'll keep this thread updated as I find out new and exciting or even disappointing information.



Matt

 

[DPugh]

Matt, I dunno why someone wouldnt have one, Patty said Scheids chassis dyno limited at 500 hp. I wonderd the same thing. She told me how far they would have to go to find one and said they would likely use Scheids engine dyno instead. I found out today even our neighboring town had a 1200hp dyno, guess what Ill be doin next week, hopefully it wont be too disappointing Keep up the good work ! I check this thread often, interesting stuff.



Derek

 

[HoleshotHolset]

Good luck at the dyno... be sure to post #'s!



Matt

 

[HoleshotHolset]

Not so encouraging news...

Well... after finally getting the 'DV holders' out of the distributor section of the pump and taking apart a lot of other stuff... I came to a few pretty solid conclusions.



1)The VP-37 and the VP-44 are more different than I thought.

2)The VP-44 doesn't have the same DV arrangement as the VP-37.



The VP-44 basically has an orifice on the opposite end to where the injector line hooks up on the 'DV holder'. The diameter of this orifice could be modified beyond the OEM diameter of 1. 012mm for more fuel flow... but who knows what that will do to the injector crack pressure.



The rotating assembly inside the distributor from this pump is seized... and is resisting my every attempt at disassembly with common hand tools. I shook an angry fist at least 10 times in its general direction... and swore at it... but that sucker is darn near welded together.



I am going to investigate #2 up above even further, but at this point it isn't a simple swap of DV's like I had originally thought.



Now I'm on the search for a VP-44 manual... one that will show some innards of the pump.



Matt

 

[Turbo Tim 1]

Matt,



Did you try shaking chicken bones at it?????