Will this pump be enough?
 

I am using THIS pump as my only fuel pump on my lt1. Would running this pump alone with 24lb injectors be enough for 100-150 shot? Thanks!

Re: Will this pump be enough?
 

I'm going to say no.

The pump is rated for "up to approximately 500 HP".

Leaving aside the whole "up to approximately" thing, if you subtract a 10% safety margin from the 500, that leaves you with 450ph. Subtract a 150 shot from that and you have 300hp. And that's flywheel HP by the way...

Now, I don't know how much power your engine makes, but I doubt it's less than 300 flywheel HP. Even if it was, that leaves you no more margin for either error or future growth.

What you basically need to do, beyond knowing the pump's pressure, is to determine how large a volume of fuel you need to support your engine's natural HP plus your nitrous shot. I forget what the specific math calculation is, but one of the experts around here can help you with that.
(I'm not an expert, just a guy with a clue or two.)

Once you know the volume of fuel you need, then you can shop for a pump.

I believe a lot of folks around here run Walbro 255's or 340's, and there is a good reason for that. Consider following the mainstream on this.

FWIW, I bought a W340 for my car, which is a basically stock LT1 with some bolt-ons and a Zex kit.

Re: Will this pump be enough?
 

That pump is rated for 282 lph at 40 psi, The Walbro that most people use is rated at 255 lph, but I don't know the rated pressure.

Re: Will this pump be enough?
 

The pump is rated for 43gph@ 40 psi. They seem to be using 6.55#/gal for the conversion, which is high for gasoline. We use 6.2 lbs which is a good all around average. Some race only fuel is as low as 5.8#/gal. If you use .5 as your bsfc/hp/hr (conservative) for your n/a hp then @ an 80% injector dc your 24# injectors are good for 307 hp. Use .6 bsfc for your average overly rich nitrous system, so a 150 shot will take 90#/hr. That's 282 #/hr @ 6.2 #/gal, more than what that pump will flow, and there is no reserve capacity.

Re: Will this pump be enough?
 

Ok, so what are my options? I don't know how to run an in tank pump on my setup since it was origionally carbed. Any ideas? Is there an inline pump that can handle it?

Re: Will this pump be enough?
 

I believe the Mallory 110FI can handle your app.

Re: Will this pump be enough?
 

Im not a fan of the inline booster pumps.This is a band aid way of fixing it.I suggest buying a Walboro intank 255 fuel pump.The stock fuel pump is only desighned to have so much volume flow through it.When the motor requires more fuel than the booster pump can flow,or pull through the stock intank pump it can cause a cavatation problem possibly burning up both pumps.I have seen tthis on several cars.I know people use the booster pumps but there are much better ways.
Dave

Re: Will this pump be enough?
 

Uh...my stock pump was mechanical :) I don't know how to put an in tank pump in my car since it never had a pump in the tank before. I would have to modify the siphon tube, put some holes in the lid and this and that and I really don't want to hack it to **** and mess it up. So unless there is an easy way to put in an in tank then I'm not gonna do it. I don't see a problem of running an inline pump as a "stand alone" pump since it doesn't suck through anything more then a regular in tank one would. It's just not in the tank. But if I did have a regular lt1 car I would just have bought a walbro 255 and forgot it lol. I'm gonna check out that mallory 110FI. Thanks guys!

Re: Will this pump be enough?
 

Ok, I looked at some inline pumps at jegs and summit and found a couple that seem a little better then mine (which flows 43GPH/163lph) . First off is a holley that flows 67GPH (255lph), and 2 vortech's first one flows 65GPH (247lph) and the second flows 70GPH (266lph). I believe that these were measured as free flow so I don't know how much they flow at around 45psi. I got the gallon to liter measurement by multiplying the gallon's by 3.8. i'm not sure if this is accurate but someone told me that's how it's done. These all seem to flow around a walbro 255 so I'm thinking I should be safe chosing one of these. I might not go with the n2o but maybe a blower (only a really low psi like 4.5-6) or do a set of heads and a bigger cam. I just want a pump that can support any of these that I chose.Thanks! :bow:

BTW, that mallory flows 418lph :eek: I don't think I need one that big yet lol!

Re: Will this pump be enough?
 

Anyone know if any of those are ok as stand alone?

Re: Will this pump be enough?
 

The holley is a reboxed walbro. They are rated at 43.5 psi so it will get the job done for what you've mentioned you want to do.

Re: Will this pump be enough?
 

awesome! Thanks!