Dual VP44's

TMONEYDIESEL said:
Now you sound like the guys who add up the horsepower ratings on chips and exhaust and intake manifolds :hehe:

I dont think anyone said that about dual CP3's when they were in development, the thing about it is, dual CP3's and Dual VP44's of which one is more time consuming to build, look at just the responses of this thread alone!! can it be done yea sure ANYTHING is possible with the right no how and money, but after you have done everything wouldnt it have been cheaper to do a ppump or just go buy a CR for gods sake :bang im sure some one will do it one day and it will be one of those trucks that no one copies what it does cause of all the issues it has but it is fun to see it go down the track when its not having electrical issues. And if your doing all this work just to compete in street stock class, think of all the money you have dumped in you could have went to a sigma or ppump and probably been competitive with other pullers,
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Taylor, twin 12cyl. P-pumps......
Lets see now if you can get 1000 outta one p-pump then times that by 4 and then throw a Banks 12V fueling module, carry the 1 and that would give you like all the hp to help rotate the earth off it's axis. :rockwoot::rockwoot:
 
Limited said:
So your saying I'm right?

A SO VP is capable of more than a stock CP3!
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Not exactly. I've got it in my head that they peter out at about the same point. (without nitrous, and since he's building a puller he won't be spraying)

And it doesn't matter if you had quad VPs, electronics that won't go past 4k, still won't give you the 5k+ possible on a 12v or CR

Quad is closer to making 4k+ consistent and reliable (and I'm assuming code free) but I've been hearing it's gonna happen for so long I'll believe it when I see it. But as it sits a Redline is still the only way to be sure to get it, and I haven't heard good about them as a DD box.
 
Yesterday Quad said they had a new 4k tune that is almost complete, just getting ready to release it not sure when that will be though.
 
Limited said:
Yesterday Quad said they had a new 4k tune that is almost complete, just getting ready to release it not sure when that will be though.
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When did he say that Limited? From what Jeremy has told me, the only way 4k is possible is with the new boards & they aren't in yet. I'm still waiting on mine.
 
Mudn_1 said:
what a about a single vp and a cp3 ran into a rail then y into the vp lines somewhere after the rail? that would be crazy!
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The CP3 pump is a high pressure pump that supplies constant pressure, and the injectors have to be physically opened and closed (Electronic, or otherwise, cam, plunger, etc).

The VP44 pump is a jerk style pump, and the injectors are dumb, mearly having a pop-pressure. SO, when the pressure gets to a certain point, the injector pops open (Like any pop-off valve would), and when the pressure falls below that point, it seals off. During injection, the pressure from the VP pump far exceeds the pop-off pressure, enhancing atomization...

So, having a CP3 pump into a rail, which, the pressure of a CP3 and a typical rail, exceeds the pop-off pressure of a VP44 injector, even at idle (5k PSI), will not work, because the injector will be injecting fuel at all times...

Unless I totally mis-understood your post... then, nevermind.

Increasing the volume of the injector lines (by adding a rail, possibly to each injector line? That's the only way it would possibly work) would have too mnay consequences, and most likely wouldn't work. Just look at the differences in drivebility, and idle lope, HP curve etc when switching from .89 lines to .93 lines and cross overs...

The high pressure CP3 pump cannot be operated like a VP44 jerk style pump... The two systems are completely incompatible.

Merrick
 
Jeremy says what Cummins724 said. New boards are required and they don't have a date of release yet.
 
Right that will be with the new board, supposed to be soon. But that means we have to send the box back to Quad? My brother talked to them, so I'm a little confused.
 
After exhaustive discussions and data collection.............................i am p pumping.
 
Bighorny said:
begle1,

Seriously?????? yeah it would mean more RPM as a SOvp cant flow up at that RPM. thats one of the points of being able to get more fuel!!!!! to drive rpm, which means the horsepower curve keeps going up!
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Injection pump plungers fall off in efficiency at RPM, with RPM in this case being reciprocations per minute, due to exponential increases in friction and inertia and loss in fill rate.

If one injection pump is inefficient, overheating and beating itself to death at 4000 RPM, adding a second one is just going to give you two pumps beating themselves to death.

It'll give more RPM capability, but it doesn't seem to me like it'd be very much. If you mount two engines that have a 4000 RPM redline on a sled puller, it's not going to let you leave at 6,000 RPM.
 
Limited said:
Right that will be with the new board, supposed to be soon. But that means we have to send the box back to Quad? My brother talked to them, so I'm a little confused.
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He will be contacting all testers as they are ready to ship them out.
 
yes bigger plingers an bores- 13mm.

no not a mod truck, 90% of the pulls out here are VTPA events or similar and only have 2 classes, stock and non stock turbo.

so i figure if p pumping my 24v puts me into a harder class 10% of the time i can deal with it.

I been waiting too long for adrenaline to get the 4k done, p pump already has the 5k tune built in.
 
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