Mike or anyone....how much NOS can our motors hold?
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Joined: Feb 2002
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From: Statesboro, Ga
Mike or anyone....how much NOS can our motors hold?
I've got this crazy thought in my head that i said i never would have but i am just curious how big of a shot of NOS will a 5.4 hold if the chip is recalibrated for it? I want to know how much would be considered safe and how much would it take to start flirting with disaster? I know there has to be some out there that is running it so please tell me what you know.
thanks
justin
thanks
justin
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Joined: Mar 1998
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From: Virginia
Hi Justin,
Those are some darned respectable times you're running there with an open 3.55 gear, mid-15's are great for that truck and it's mods. That 2.16 short time is especially good considering you have an open 3.55 rear end, that track must have had a lot of VHT layed down to pull a 2.16 60', good for you!
Right now your power levels are just about maxed out for what your stock fuel pump & fuel injectors can support, so you cannot use *any* nitrous oxide right now at all until you upgrade at least the fuel pump. Right now, the stock fuel pump can't supply enough fuel even with a "wet" type of nitrous kit on top of the power you're already making with those mods.
Generally speaking, we do not like to see anything more than a 75 hp shot of nitrous run on top of the typical chip, intake, exhaust & fans type of mods, as at that point, with a 75 hp shot of nitrous you're at about 400 hp flywheel in a '99 & up 5.4 F-150.
With a supercharger, those cast pistons can support a bit more than 450 hp, as a blower is much gentler on the motor than nitrous is. Nitrous is an instant explosion of power, where with a blower, even a Roots type, the power gain is more gradual and thus much easier on the motor. With nitrous oxide 400 hp is about it for those pistons, assuming you have about 300-325 hp on the flywheel as a result of other mods, and then a 75 hp shot of the funny air.
The 5.4's have a great forged steel crankshaft and decent rods, but the pistons will limit you in this regard, they will give up before the rods do on nitrous, and way before the crank will.
One other thing to think about is that if you intend to make more than 450 hp (even with nitrous) down the road, you'll need to do some involved fuel system changes (at a minimum, new fuel rails, adjustable fuel pressure regulator and a 255 l/hr. fuel pump), as you have a returnless fuel system there that can only handle about 450 hp or so regardless of pump & injector size. To go significantly higher than about 450 hp the best thing to do is to convert over to a return type of fuel system, like the pre-1999 F-150's have, and that's an involved process, though certainly do-able.
With the power you are making right now in that 5.4, you need to upgrade the fuel pump and the fuel injectors to make any more power, and once that is done I would not run more than a 75 hp shot of nitrous at most.
If you have any questions on any of this just give us a call, & good luck!
Those are some darned respectable times you're running there with an open 3.55 gear, mid-15's are great for that truck and it's mods. That 2.16 short time is especially good considering you have an open 3.55 rear end, that track must have had a lot of VHT layed down to pull a 2.16 60', good for you!
Right now your power levels are just about maxed out for what your stock fuel pump & fuel injectors can support, so you cannot use *any* nitrous oxide right now at all until you upgrade at least the fuel pump. Right now, the stock fuel pump can't supply enough fuel even with a "wet" type of nitrous kit on top of the power you're already making with those mods.
Generally speaking, we do not like to see anything more than a 75 hp shot of nitrous run on top of the typical chip, intake, exhaust & fans type of mods, as at that point, with a 75 hp shot of nitrous you're at about 400 hp flywheel in a '99 & up 5.4 F-150.
With a supercharger, those cast pistons can support a bit more than 450 hp, as a blower is much gentler on the motor than nitrous is. Nitrous is an instant explosion of power, where with a blower, even a Roots type, the power gain is more gradual and thus much easier on the motor. With nitrous oxide 400 hp is about it for those pistons, assuming you have about 300-325 hp on the flywheel as a result of other mods, and then a 75 hp shot of the funny air.
The 5.4's have a great forged steel crankshaft and decent rods, but the pistons will limit you in this regard, they will give up before the rods do on nitrous, and way before the crank will.
One other thing to think about is that if you intend to make more than 450 hp (even with nitrous) down the road, you'll need to do some involved fuel system changes (at a minimum, new fuel rails, adjustable fuel pressure regulator and a 255 l/hr. fuel pump), as you have a returnless fuel system there that can only handle about 450 hp or so regardless of pump & injector size. To go significantly higher than about 450 hp the best thing to do is to convert over to a return type of fuel system, like the pre-1999 F-150's have, and that's an involved process, though certainly do-able.
With the power you are making right now in that 5.4, you need to upgrade the fuel pump and the fuel injectors to make any more power, and once that is done I would not run more than a 75 hp shot of nitrous at most.
If you have any questions on any of this just give us a call, & good luck!
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From: Humble, Texas
I've got a couple buddies that have the pushrod v6 3.8 or 4.2 that spray... most are 100shot two are 125 and I was running 75shot. I wanted to do 100 shot but I have an open rear end (NOT FOR LONG!!!) and didnt' think it'd be worth it.