Max whp on Stock injectors?
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dillusion13
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Max whp on Stock injectors?
What would be the max whp that you could get out of the stock injectors. Thinking of changing the turbo out when I do the swap of rb25det r33, but I would like to know approx, what HP the injectors get maxed out at?
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Imissmyturbo
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PROJECTRB240SX
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themadscientist
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I've done 3 250hp on OE RB20 260s. That's dyno not "I think so"
use their injector calculator to figure ithttp://www.rceng.com
I wouldn't push RB20 squirts past 250hp or 370s past 350. Just because you can doesn't mean it's a good idea. You start increasing pulsewidth and rail pressure too much to force the injectors to push more fuel than they are designed to and something will fail and your pistons will not like you anymore. Be careful and don't proceed without GOOD instrumentation to warn you if you are leaning out.
use their injector calculator to figure ithttp://www.rceng.com
I wouldn't push RB20 squirts past 250hp or 370s past 350. Just because you can doesn't mean it's a good idea. You start increasing pulsewidth and rail pressure too much to force the injectors to push more fuel than they are designed to and something will fail and your pistons will not like you anymore. Be careful and don't proceed without GOOD instrumentation to warn you if you are leaning out.
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PROJECTRB240SX
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themadscientist
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I don't bother with crank horsepower numbers. I don't wheel my engine up to the light on a dyno and race the other guy so those numbers are a waste of time to me. RWH is the only practical measurement for the engine as it relates to powering a car against another because whatever comes out of the tire is what you have to work with. As far as tuning the engine itself then of course crank HP is going to yeild better numbers to tune with because you remove all variables of the drivetrain.
I try to steer away from any "it's always this" rule. Every motor has different flow properties so a certain injector in different engine might do better. CAs for instance run crazy rich on #4 while the other cylinders lean out. If the distribution of air were better you might be able to squeeze higher power numbers out of the same injectors.Unless I have had the injectors flow checked I don't exceed 75% duty even though industry standard is 80%. I assume they are dirty and spraying uneven. I don't tune without a fuel pressure gauge and an Air/Fuel meter either. I say 250hp because I have done it a few times on used 260s and know it works so I am comfortable suggesting it to others. If I cleaned them and turned up the pressure some I could probably support higher power levels but the margin for error decreases exponentially and I won't say "do that" unless I actually am working on the motor and know it's condition first hand. I don't want anybody popping their RB thousands of mile from replacement parts because I told them to do something so I will always err on the side of caution. My own motors, hehehe they earn their keep baby!
I try to steer away from any "it's always this" rule. Every motor has different flow properties so a certain injector in different engine might do better. CAs for instance run crazy rich on #4 while the other cylinders lean out. If the distribution of air were better you might be able to squeeze higher power numbers out of the same injectors.Unless I have had the injectors flow checked I don't exceed 75% duty even though industry standard is 80%. I assume they are dirty and spraying uneven. I don't tune without a fuel pressure gauge and an Air/Fuel meter either. I say 250hp because I have done it a few times on used 260s and know it works so I am comfortable suggesting it to others. If I cleaned them and turned up the pressure some I could probably support higher power levels but the margin for error decreases exponentially and I won't say "do that" unless I actually am working on the motor and know it's condition first hand. I don't want anybody popping their RB thousands of mile from replacement parts because I told them to do something so I will always err on the side of caution. My own motors, hehehe they earn their keep baby!