procharger+carb

[obituary]

blow threw carb w/ a procharger.....what kind of fuel pump is requiredflow and how much pressure/flow?

[Tiffiny]

7 psi and you should go with a bypass return style fuel system

[obituary]

7 psi and you should go with a bypass return style fuel system

yeah i was reading on prochargers site .to use a elec fuel pump ,but they say......






=========Fuel pump (carbureted applications):
Your fuel pump must be capable of supplying the proper amount of fuel flow at the maximum operating pressure. To determine maximum operating fuel pressure requirement, add your maximum boost pressure to your initial idle fuel pressure.

Example:
(8 psi idle fuel press.) + (10 psi boost press.) = 18 psi max. fuel press.

multiplying this figure by 1.2 (20% safety factor) gives us 21.6 psi

To determine required fuel flow, multiply your total expected horsepower by a bsfc (brake specific fuel consumption) of .65. This will give your fuel flow requirement in 1bs/hr. To convert to gallons per hour, divide this figure by 5.87.

Example:
(500 boosted hp) x (.65 lbs/hr/hp bsfc) = 325 lbs/hr fuel flow

325 lbs/hr / 5.87 lbs/gal = 55.4 gals/hr fuel flow

Therefore, a fuel pump capable of providing a minimum fuel flow of 55.4
gals/hr at a pressure of 21.6 psi is required.

This can be accomplished by an all electric high pressure-high flow fuel pump (i.e. SX #18201, B.G. 400, Magna-Flow 250 or similar type fuel pump) and a return style, boost sensitive fuel pressure regulator (Mallory #4309 or similar). Or by using a boost referenced mechanical fuel pump only (up to 500 hp) or a boost referenced mechanical fuel pump in conjunction with a low pressure electric pump (i.e. Holley blue, Comp 140 or similar).=========







sounds complicated :-|

[obituary]

but i know carbs can only hold around 7psi ....but maybe with the presure -insted of vacume on a blow thru ,i might need to boost the fuel pressure to compensate ? idk

[diceman469]

I'd say it's a waste...you'll probably blow all the seals out of the carb. EFI is the best route. TBI could probably be added with minimal modification as well as standalone.

[obituary]

I'd say it's a waste...you'll probably blow all the seals out of the carb. EFI is the best route. TBI could probably be added with minimal modification as well as standalone.

i dont think tbi can give me the cfm i need..and if i had $2000 to thro on efi ,i would ,and i still might :)

[Tiffiny]

plenty of blow through carbs rolling around[ carb ftw]

[351coupe]

I'd say it's a waste...you'll probably blow all the seals out of the carb. EFI is the best route. TBI could probably be added with minimal modification as well as standalone.:roll: Have you seen the #'s and times blowthrough cars are making?

[obituary]

:roll: Have you seen the #'s and times blowthrough cars are making?

yeah :D