Estimate on horsepower?
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Junior Member
Joined: Apr 2001
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From: Canada
Estimate on horsepower?
Heres a question for you guys.. what would a 1998 F150 with a 5.4L, Cold air intake, Throttle body spacer, and a flowmaster muffler have for horsepower? the exhaust leaves infront of the rear tires.. Your estimates would be much appreciated. I say 20hp MAX..
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Joined: Mar 1998
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From: Virginia
Hi 50,
That is going to depend on exactly what type of "cold air" modification was done, and what exactly was done to the exhaust. However, in any case it's going to be many times more than 20 hp, as that engine is 235 hp bone-stock.
I'm teasing a bit with you here, I think you meant to say that you thought the maximum power gain from those mods would be 20 hp, I'm sure.
Just changing a muffler will get you about a 5-6 horsepower gain. It doesn't matter so much where the exhaust exits, what matters most is the design of the entire exhaust system and it's flow rates & flow velocity.
Let's say you have a 1998 F-150 5.4 with an airbox elimination kit like the K&N FIPK kit or the Airaid unit, and then a good cat-back exhaust. The airbox kit will get you about a 13 hp gain on the 235 hp version of the 5.4 motor, and a good cat-back exhaust system maybe 10-12 more hp on that motor. Since we don't know *exactly* what was done to the intake or the exhaust, we can't really say what it's really making, but it's probably somewhere around 250-255 hp total by now, assuming just a muffler change on the exhaust side, and a complete airbox elimination kit was installed on the intake side.
Good luck,
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Mike Troyer
Performance Products, Inc.
National Distributor of Superchips
(540) 862-9515
Email: mtroyer@compuserve.com
Performance Products F150Online Superchip ordering system: F150Online Superchip Ordering System
First National F-150 Online Rally Event Organizer
That is going to depend on exactly what type of "cold air" modification was done, and what exactly was done to the exhaust. However, in any case it's going to be many times more than 20 hp, as that engine is 235 hp bone-stock.
I'm teasing a bit with you here, I think you meant to say that you thought the maximum power gain from those mods would be 20 hp, I'm sure. Just changing a muffler will get you about a 5-6 horsepower gain. It doesn't matter so much where the exhaust exits, what matters most is the design of the entire exhaust system and it's flow rates & flow velocity.
Let's say you have a 1998 F-150 5.4 with an airbox elimination kit like the K&N FIPK kit or the Airaid unit, and then a good cat-back exhaust. The airbox kit will get you about a 13 hp gain on the 235 hp version of the 5.4 motor, and a good cat-back exhaust system maybe 10-12 more hp on that motor. Since we don't know *exactly* what was done to the intake or the exhaust, we can't really say what it's really making, but it's probably somewhere around 250-255 hp total by now, assuming just a muffler change on the exhaust side, and a complete airbox elimination kit was installed on the intake side.
Good luck,
------------------
Mike Troyer
Performance Products, Inc.
National Distributor of Superchips
(540) 862-9515
Email: mtroyer@compuserve.com
Performance Products F150Online Superchip ordering system: F150Online Superchip Ordering System
First National F-150 Online Rally Event Organizer
Senior Member
Joined: Oct 2000
Posts: 470
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From: Edmonton, AB
Welcome to the boards Mr5oh
btw, i love the nickname!
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Bambino Online
Owners Gallery Truck #179
1999 reg cab/short box/ORP - 3.55; 4.6l 5sp; factory snapless tonneau; twin 6" kicker sub tubes; Custom Exhaust; Mobil 1 5w30/Motorcraft FL820-S
btw, i love the nickname!
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Bambino Online
Owners Gallery Truck #179
1999 reg cab/short box/ORP - 3.55; 4.6l 5sp; factory snapless tonneau; twin 6" kicker sub tubes; Custom Exhaust; Mobil 1 5w30/Motorcraft FL820-S