This question should be divided into four segments for your responses to the following questions:

* What is idle rail pressure for oem, lvl 1 cp3, lvl2 & lvl3 cp3s???

* What is the wot rail pressure for oem, lvl 1cp3, lvl2 & lvl3 cp3s???

* What is cruising rail pressures for all the above???

* What is the absolute lowest rail pressure you should see for all the above in a wot run???

I would like to see each of the primary builders of modded CP3s step up and put it down in writing so we all can know what we can expect out of each and at each level.

 

Wish i could help you, no rail guage. I will say floor its pump it Edit

 

well you might as well add a diy cp3 the compare

 

Yep, looking for both member and manufacturer info on this question.

 

If someone has REAL data that is quanitfiable and measured by quality equipment it would be useful for sure.

 

not that it is on subject but i was thinking of doing the diy cp3 after i get my diablo stack and lift pump

 

Wow I can see this getting out fo control, I would say that there is so many variables to each question. Injectors, lift pumps, boxes, pressure, timing, duration. etc....

And plus isn't a modded CP3 just going to help to keep from draining the rail, and to keep the rail at what the ECM is calling for? What I mean is that at crusing speeds if the ECM is calling for 12k psi that all the pumps should be the same, until you step on the go pedal and start needing more fuel.
I guess that is my thought on it. So I guess that you would be more interested in what the WOT flow rate would be. Is this right or make any sence?

Thanks
Snoxracer

 

No reason for the out-of-cotrol stuff,... I took some measurements today and I like most folks feel there should be certain expectations when you spend your money on a product. So what is that expectation in the above scenarios? There are different level cp3s sold so obviously there must be real bench tested results to support the additional costs to the customer,.. so what are they?

The measurements I took on my truck were with just sticks and with sticks and a Scary Larry program. Surprisingly the variance was minimal,... 500psi was the only difference. Nope,... not gonna steal the thunder of the manufacturers here,... I want to here what the numbers are or should be?

 

Whats your point?

 

Unbelievable. Not worth much of a response. I simply asked the question and for those who can read the question/s are clear. Awaiting a response.

 

What kind of results would you expect?????? The ECM controls the FCA and in return controls the rail pressure. That being the case, the rail pressure should remain close to stock levels while crusing or ideling. Not to mention you left a very large margin for specs????? Injectors play a huge part in pressures. How are they suppose to give you pressure ratings for WOT runs when there are different injector designs and flow ratings? Obviously a set of 100 HP injectors are going to show higher rail pressure than my 275 HP sticks. Then you also have to factor in the extra injection event that 04.5 trucks have that the previous years did not have. That also helps drain the rail.

The best you might get is actual flow ratings for the pumps. And even then, you are at there mercy if they give you acurate numbers.

 

Imills,

I have learned to respect your input over the last few years as you don't go off the wall like many. Having said that, .... as my sig states I have a lvl 2 cp3. I want to know if it is operating correctly and I have taken specs on it and I would think the manufacturers would be able to post their specs for each unit and each level of performance, i.e. lvl 1 vs lvl2 etc.

Haven't many posted numbers in the low to mid 20k's??? According to your statement then those numbers are meaningless as do they have 100hp sticks or stockers and then what box are they running etc, etc. I don't recall anyone saying to those folks well your data is meaningless when they posted??

If you buy other products then there is measurable data and I submit that these products are likewise measurable. What exactly does a lvl1 vs lvl2 vs lvl 3 mean to the end user? Ok the number is bigger and that is worth "X" amt of $$$? It's hard to believe others are not having questions about what they buy and just bolt it on and not know what it's doing for you. I guess it's not so unbelievable as it seems I did that very thing. For the 1st time though I took measurments and just want to know if it is where it should be. Simple.

If people are that uncomfortable with this process then feel free to PM me and I will not share any data you provide me.

I have seen/read threads where people took these same lvl pumps to outside sources and had them measured and supposedly one put out a bit more. Ok, what I want is what are these numbers in the original scenario mentioned at the beginning of this thread. One pump % over the other means squat to me. I want the data. Simple.

Tks for any help in understanding this.

 

I dont really think sticks or any other mods should vary what the different modded cp3's should flow volume wise and pressure. It would affect the overall performance of the motor but not the actual cp3. I would like to know the volumes of fuel that the different cp3's flow, for example the DIY mod, the stage II and so on. I dont think the modded cp3's necessarily raise pressure, but supply a higher volume of fuel. I am like OT-OF-Here, I would like to know what I am getting out of the modded pumps, especially for paying that kind of money !!!

 

I have no problem releasing data in the open. I am very comfortable with what my pump flows. For a stage 2 pump with 275 HP worth of injectors, the SP Diesel pressure box and the Smarty, I am able to maintiain about 18.5-19K of rail pressure. And that is at 725-730 HP. Some may think it is a little low on rail pressure, but just how many have approached that level on #2 only and a single pump?

I hope that may help point you in the direction you are looking. If you need any more feedback, let me know. I will try to dig some up. However, like I said, the cruise pressures and idle pressure should be about the same. The problem with looking for WOT runs is there are too many variables. Different box combinations, different settings on the box, low pressure fuel systems, condition of the CP3 before modding, size of injectors, etc.

If you have numbers, shoot them to me (PM) and we will see if we can make heads or tales of them.

 

Are you saying bigger injectors should not pull the rail pressure down more than small ones? Or that a duration box like the TST that can hang the injector open longer than needed will not drain the rail? Granted you are correct that the CP3 will still flow the same amount of fuel, but if the injector has holes twice as large as stock it only stands to reason that the pump will not build as much pressure.