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Message: [QUOTE="V-Ref, post: 106005, member: 660"] This was posted by a pretty smart fella a while back- __________________ The most common question I see for guys wanting to pick injectors is what to get and why. There is a general formula I like to use that is 2.3HP for every CC of fuel that you can use effectively. Do these numbers jive with what everyone is seeing in the real world? So figuring RWHP with an automatic trans. This takes into account horsepower peak happening between 2600-3000RPMs. All numbers based on single shots. Here are some common injector combinations and the power level they usually accomodate. This also assumes you can maintain proper HPOP pressure. I am also using common street nozzles 30% EH, 80% and 100% EDM nozzles. The larger nozzles allow you to push the power peak up into the higher rpms and make more HP. These are typical fuel only numbers because nitrous oxide allows you to peak the power lower in the RPM scale and make more peak torque and therefore more HP. There are so many variables that these are merely general guidlines. General Rule of Thumb max power with no nitrous (but a properly matched turbo): 90cc stock nozzle 225HP 130cc stock nozzle 260-290HP 160cc stock nozzle 300-345HP 160cc 30% nozzle 350-360HP 180cc stock nozzle 300-350HP 180cc 30% nozzle 370-390HP 180cc 80% nozzle 400-425HP 200cc 30% nozzle 385-410HP 200cc 80% nozzle 400-440HP 200cc 100% nozzle 420-460HP 238cc 30% nozzle 440-475HP (depends on air flow in lower rpms can make 550HP with nitrous for example) 238cc 80% nozzle 450-520HP 238cc 100% nozzle 465-550HP 250cc 30% not much gain over 238cc with 30% 250cc 80% nozzle 460-530HP 250cc 100% nozzle 470-575HP It gets sketchy above that number due to the other variables that are involved with HP levels much above 550. Also remember that RPM can play a major factor. Somebody have corrections or want to add anything? __________________ Matt Robinson Gearhead Automotive Performance --------------------------------------- Not sure about 200% nozzles. 706 hp was made by Thuglike recently with 200% nozzles and a GT4202....highest number I've heard or read of for 200%'ers. JMHO-But most of the 200% nozzle trucks need more air, or built motors to see the nozzles full power potential realized. [/QUOTE]