98 F150 4.6 L
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Member
Joined: Oct 2000
Posts: 45
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From: Franklinton, NC 27525
98 F150 4.6 L
Hey guys does anyone have any specific info on the 98 4.6l engine. I would like to know what the advertised HP and Torque is for the engine and at what RPM's. If you would have a dyno chart to post that would be great. I am re-gearing my truck from 3.55 to 4.56 and want to make sure this is the right gear for the 33" tires.
Thanks!
Thanks!
I believe the 98 was 215 HP stock or about 150 HP at the rear wheels. With the chip, headers,K&N, and exhaust, I dynoed at about 240 HP or about 175 at the rear wheels. Here is my latest dyno with the below mods. Hope this helps you. 
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98 White 4.6 Triton STX (It's not an STX anymore) Flairside,Class III hitch, Blue Cobra Stripes, Euro Lid by Astro, Bed Rug, Fiero Wing, Air Dam,Ground Force 2-4 Drop,Custom MB Phantom Wheels,clear corner lenses,monster battery terminals,MTX Sub Box with 2 10 inch Polk Subs, 4 Plok Speakers, MTX 102 Amp with Pioneer FH-P4400 CD Cassette Head Unit,Custom Programmed Super Chip,BBK 75mm TB, Pro M 80mm MAF,Pillar Pod w/ boost and trans temp,Jacobs DIS Ignition,Art Carr 2000-2400 stall transmission,4:10 gears,custom rear end housing, custom intake tube, Jet coated JBA stainless headers, Magna Flow Muffler with Stainless Duals and of course fully Blown by Magnacharger!
[This message has been edited by Flats Man (edited 01-14-2001).]
[This message has been edited by Flats Man (edited 01-14-2001).]
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98 White 4.6 Triton STX (It's not an STX anymore) Flairside,Class III hitch, Blue Cobra Stripes, Euro Lid by Astro, Bed Rug, Fiero Wing, Air Dam,Ground Force 2-4 Drop,Custom MB Phantom Wheels,clear corner lenses,monster battery terminals,MTX Sub Box with 2 10 inch Polk Subs, 4 Plok Speakers, MTX 102 Amp with Pioneer FH-P4400 CD Cassette Head Unit,Custom Programmed Super Chip,BBK 75mm TB, Pro M 80mm MAF,Pillar Pod w/ boost and trans temp,Jacobs DIS Ignition,Art Carr 2000-2400 stall transmission,4:10 gears,custom rear end housing, custom intake tube, Jet coated JBA stainless headers, Magna Flow Muffler with Stainless Duals and of course fully Blown by Magnacharger!
[This message has been edited by Flats Man (edited 01-14-2001).]
[This message has been edited by Flats Man (edited 01-14-2001).]
Senior Member
Joined: Jul 2000
Posts: 137
Likes: 0
From: Florissant MO, US
My truck witht eh stock 4.6l dynoed at 166 rwhp...
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1998 F150 Nascar Edition
RC, 4.6L, 3.73
Performance Mods ... Superchip, Flowmaster SI/DO Lightning Exhaust
Other Mods ... Sony Explode Reciever and 12 Disc Changer
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1998 F150 Nascar Edition
RC, 4.6L, 3.73
Performance Mods ... Superchip, Flowmaster SI/DO Lightning Exhaust
Other Mods ... Sony Explode Reciever and 12 Disc Changer
Registered User
Joined: Nov 2000
Posts: 47
Likes: 0
From: MI, USA
in '98 the advertized numbers are
220hp @ 4500
290ft-lbs @ 3250
I'm no expert, but 4.56 gears sound like a bit much for just 33's. The truck comes stock with the metric 31" equivalents -right? It sounds like you may be going a little too far. that truck is gonna be hurting if you use the highway much. Do you have a reason for this ratio? Are you a real rock crawler? the 4.10 might be a better option if not
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2000 XLT SC FS, 4.6/5-spd, 3.55 LS, 4X4 Off-Road, Black w/ Silver 2-tone. Pro-chamber Cat-back exhaust w/dual 3.5" chrome slash cut tips, K&N Filter, AutoMate alarm w/keyless entry & pwr window control, Air Horns, Bugflector, Cowl cover, Window shades, Carbon fiber headlight covers.
220hp @ 4500
290ft-lbs @ 3250
I'm no expert, but 4.56 gears sound like a bit much for just 33's. The truck comes stock with the metric 31" equivalents -right? It sounds like you may be going a little too far. that truck is gonna be hurting if you use the highway much. Do you have a reason for this ratio? Are you a real rock crawler? the 4.10 might be a better option if not
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2000 XLT SC FS, 4.6/5-spd, 3.55 LS, 4X4 Off-Road, Black w/ Silver 2-tone. Pro-chamber Cat-back exhaust w/dual 3.5" chrome slash cut tips, K&N Filter, AutoMate alarm w/keyless entry & pwr window control, Air Horns, Bugflector, Cowl cover, Window shades, Carbon fiber headlight covers.