I am installing a direct port nitrous system on my LT1 (NX-80000 EFI). I am converting it to a low-pressure carb style direct port and will be running a supplemental fuel system with a small fuel cell.

I am trying to determine if a 110gph or 140gph fuel pump will support a 300 shot.

Is there a rule of thumb for picking proper fuel pump? I remember seeing something a long time ago on NOS's webpage about it being something like .6 lbs of fuel per horsepower?

Thanks,

Dave

 

Fuel Volume is relatively simple to achieve, though you always want plenty of room to spare. It is sufficient pressure that is the tough one. I'd recommend a pump pressure of 3 times the flowing fuel pressure at the regulator/nozzle of the given Nitrous system.

Taking your Nitrous Express system, all settings are based on a 10lb tuneup, and so ideally you would want a 30 psi pump. This is to help keep pressure fluctuations in check when dealing with the opening of the solenoid.

I know cost is often a factor, but the Magnaflow 300 is a very nice dedicated pump, and should supply whatever you need.

*Note many will consider this far overkill, however when dealing with Nitrous enrichment and expensive engines.......... <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> I'm sure you get the idea.

 

For a 300hp shot, you want much more volume. I am running the MagnaFlow Star 300 which is a 300 g/h pump set at 28 psi and the regulator set at 19 psi.

Remember that the fuel jets on each nozzle really regulate the fuel flow. For a DP system, it is always better to have more pump than not enough.