Lacking bottom end.
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Lacking bottom end.
I have a 2002 F-150 with a 4.6l and I have added a Flowmaster exhaust, a K&N filter, a throttle body spacer and even added a Tornado and I'm disappointed with the results. I think the truck performed better stock than it does with these add-ons. Is anybody else having similar problems or have any suggestions of what I could do to regain my bottom end performance? I want to try to regain my bottom end before I try a chip or open air intake. Someone please help with any suggestions.
Last edited by RobbyMartin; Apr 21, 2004 at 11:29 PM.
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From: Hockley, Tx.
Originally Posted by RobbyMartin
Everything is stock except for what I mentioned. The thing just isn't as responsive as it used to be. Have any clues as to what it could be?
Just my usual .02 worth
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From: Charlotte, NC
DITTO.....get rid of that "tornado" device. It's not worth the box it came in, and the "turbulence" it is causing at your throttle body inlet may actually be causing a LOSS of power.....rather than the advertised power increase!!
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Originally Posted by fanman2
DITTO.....get rid of that "tornado" device. It's not worth the box it came in, and the "turbulence" it is causing at your throttle body inlet may actually be causing a LOSS of power.....rather than the advertised power increase!!
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From: Hacienda Heights, CA
I concur on the computer learing issue. This is a HUGE deal. Now I don't know the specs on your Flowmater exhaust but if you went too big on tailpipe this could seriously curtail bottom end torque. Gotta keep those gasses flowing, especially with Flowmaster's "pulse-scavenging" technology. An over large tailpipe, or even just the outlet, can cause a low pressure zone that actually will somewhat stall the exhaist flow. This is most commonly seen at lower speeds and RPMs since you are not pushing as much exhaust.
I know it's a different vehicle but I put a Flowmaster 40 in my '91 4Runner and it made a huge difference with the 2" pipe. Later I went to 3" outlet just to be cool and the performance plunger well below how the stock unit performed.
I know it's a different vehicle but I put a Flowmaster 40 in my '91 4Runner and it made a huge difference with the 2" pipe. Later I went to 3" outlet just to be cool and the performance plunger well below how the stock unit performed.
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Originally Posted by les017
I concur on the computer learing issue. This is a HUGE deal. Now I don't know the specs on your Flowmater exhaust but if you went too big on tailpipe this could seriously curtail bottom end torque. Gotta keep those gasses flowing, especially with Flowmaster's "pulse-scavenging" technology. An over large tailpipe, or even just the outlet, can cause a low pressure zone that actually will somewhat stall the exhaist flow. This is most commonly seen at lower speeds and RPMs since you are not pushing as much exhaust.
I know it's a different vehicle but I put a Flowmaster 40 in my '91 4Runner and it made a huge difference with the 2" pipe. Later I went to 3" outlet just to be cool and the performance plunger well below how the stock unit performed.
I know it's a different vehicle but I put a Flowmaster 40 in my '91 4Runner and it made a huge difference with the 2" pipe. Later I went to 3" outlet just to be cool and the performance plunger well below how the stock unit performed.
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Originally Posted by dgdee
How much hp increase do you think you gained with all those mods?