ANSWER: We only recommend Stage I pumps for up to 200cc injectors and Stage II pumps for up to 350 to 400cc injectors because that is the largest that those pumps will run efficiently. Our Stage I or II pumps might flow enough to run some larger injectors but they will not be at their most efficient level. The larger the pump you go with the faster it can build pressure from idle to WOT. Some company's out there might recommend their smaller pumps for larger injectors than we do, but they probably won't be operating those larger injectors properly. You are going back to the same problem which is why you are looking for a aftermarket pump in the first place. If a stock pump can't keep up with stock split shot injectors and a hot chip, then how can a pump that only flows 50% more than keep up with injectors that are 100% larger than stock?
ANSWER: Well, that is a loaded question. Power level increases once again vary from truck to truck and setup to setup. We have seen up to a 39h.p. and 89 lb/ft. tq increase at the wheels on a truck with nothing more than a aftermarket chip, intake, and exhaust. You will see more of a power level increase the with bigger injectors and/or hotter tuning. The bigger the injectors the better these pumps perform.
QUESTION: Do I have to modify anything to install one of the new Stealth Pumps?
ANSWER: No, if you are installing one of our Stealth Pumps on a 99' to 03' 7.3L Powerstrokes. Yes, if you are installing one of the Stealth Pumps on a 95' to 97' 7.3L Powerstrokes. 95' to 97' Powerstrokes must relocate their fuel filter bowl.
QUESTION: How come you don't recommend your Stage I or Stage II Stealth Pumps for larger injectors?
QUESTION: Why does the Stealth Pumps use a 4 line output kit when other company's don't?
ANSWER: When you increase the size and volume output of a pump you must increase line size, or the number of lines to be able to keep up with the increase in pump flow. The factory two lines and fittings will only flow so many gallons per minute, those two lines will become a pressure restriction. We have seen a pressure "back-up" when running larger pumps with the factory two HPOP lines, as much as a 600 to 700 psi difference between the pump and the head. By increasing to 4 lines we are effectively doubling the GPM's that can be transferred to the heads. This allows the pumps to operate at their full potential. Lets say that you had a 100 gallon fuel tank and you wanted to get that fuel out as fast as you can, you have your choices between a average home garden hose or a fire hose. Which hose would you use?
QUESTION: How much pressure can I run with my pump and injectors?
ANSWER: The factory designed our HEUI injectors in our 7.3L Powerstrokes to run efficiently at approximately 3000 psi. We don't recommend running pressures over 3200 to 3300 psi. There are no significant power gains by ramping pressures over 3400 psi regardless of what you hear out there. All you will do is create unwanted stress on your injectors and injection system components.
The purpose of this page is to educate those of you who are in the market for a high performance HPOP (High Pressure Oil Pump). The information below will help you decide on which system is the one for you even if it is not one of our designs. We will supply the information in the form of questions and answers (Q and A). We will debunk some of those myths out there about HPOP's and how they work. The information you will find here is 100% UNBIASED and based on FACTS! We have done a tremendous amount of research and development on the HEUI injection system for the 7.3L Powerstroke engine and would like to share our knowledge base with you.
QUESTION: How do I know if I need a aftermarket HPOP or not?
ANSWER: If your factory HPOP, IPR valve, and ICP sensor are in good working condition and you are getting a service engine soon light then you might be in need for a aftermarket HPOP. We recommend that you have at least a "hot" performance chip or box to utilize a aftermarket pump. If you have injectors and/or a performance chip then you probably can benefit from a aftermarket HPOP.
QUESTION: Will my completely stock truck benefit from a aftermarket pump?
ANSWER: No. These aftermarket pumps will not improve performance if you have no injection system or computer fueling modifications.
QUESTION: Do these pumps improve fuel mileage, exhaust gas temps, or smoke levels?
ANSWER: Yes and No. Yes aftermarket pumps will improve your fuel mileage. Aftermarket pumps can also help reduce your exhaust gas temps and smoke levels. There is one catch though, these pumps improve performance so much that you are tempted to "put your foot into it" and that is what will keep you from seeing fuel mileage, EGT, or smoke level improvements. Most people will see a improvement when the novelty wears off. What happens is they become accustom to the power increase and start to drive "normal" again. How much of an improvement varies from truck to truck and setup to setup, so definite numbers can't be stated.
QUESTION: How much of a power increase will I see with one of these aftermarket pumps?
SPD Stealth Pump Facts vs. Myths
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Sales and Tech info. (314)-766-7867
QUESTION: I heard that the new Stealth Pumps won't make pressure at lower rpm's as well as other pumps, is this true?
ANSWER: This rumor could not be further from the truth. The fact is these new pumps will build pressure faster than any other pump out there. These new pumps will reach any pressure level at any rpm if the programming asks for it.
