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DG
Dodge Dakota
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3/16/2004
12:37:22
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 Subject: torque gains from exhaust
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Message:
Is there any exhaust set up that would give me a little more torque or at lest not lose any on my 4.7? I was hopeing to go with a Flowmaster muffler, I also want good a sound.
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Kent
Dodge Dakota
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3/16/2004
13:34:06
|  RE: torque gains from exhaust
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Message:
IMO, keep the stock 2.5" tailpipe for the best lowend torque... and add the muffler sound of your choice.
If that's not loud enough for you, you can always add a large tip to get a bit more sound out of it....
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hot rod
Dodge Dakota
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3/17/2004
17:17:09
| RE: torque gains from exhaust
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Message:
a few years back Hot Rod magazine did a RR dyno test on a 4.7 Dak, with and without headres. The cast iron manifolds on the 4.7 are really hard to beat when comparing to headers. The truck only gained, get this, 3 hp and 4 ft.lbs torque over the stock cast iron manifold. so ya gotta ask yourself, is it cost effective? cause unless your are racing for really big bucks, you wont even notice it in your "butt dyno" if you dod not know it did or did not have headers.
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deerridge
GenIII
3/18/2004
11:29:13
| RE: torque gains from exhaust
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Message:
Headers, according to Gibson and the Kenne Bell folks give about 12RWHP and 20 ft lbs. of torque, The larger exhaust seems to make only an addtional 2 hp or nothing depending on where you look. A sound only option I suspect. The headers made a noticable impact on low end torque combined with a PCM change on my 03 RC AWD. It pulls much better in OD than stock.
Real Horsepower
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kowalski
Dodge Dakota
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3/18/2004
15:24:29
| RE: torque gains from exhaust
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Message:
I wonder why that's not what Hot Rod found ?
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deerridge
GenIII
3/18/2004
15:59:03
| RE: torque gains from exhaust
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Message:
He said it was a few years old. Who knows. Kenne Bell has a chart under there Optimizer II showing their results. Gibson has a dino graph on their site now too for the 4.7. I had heard that before too, my results make me believe Gibson and Kenne Bell. K&N claims a 10hp gain, but Kenne Bell shows nothing. Lots of contradictions for sure. See what works I guess. Alot of it shows up in torque with a small HP change too.
Real Horsepower
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Pittdawg
Dodge Dakota
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3/18/2004
16:55:38
| RE: torque gains from exhaust
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Message:
If you look closely at the kennbell site they merely remove components (i.e. the tb, the air intake, exhaust, etc.) as if this could show the maximum horsepower to be gained from upgrading to a version with more airflow, however, on an entirely computer controlled engine with very tight tolerances removing an item entirely is not going to gain power the same way upgrading the item with a higher air flow will. They only do it that way so as to make an argument nothing works but a supercharger. Look at Gsmotorsports site, they gained 14rwhp from an exhaust mod...what does kennebell have to say about that? Furthermore, in regards to headers, the kennebell used long tube headers , the hot rod magazine used like the first shorties to ever come out, don't know if the newer shorties are any better though---the real restriction in the exhaust is the bottleneck created by the two precats, remove those and headers and exhaust can start adding power.
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deerridge
GenIII
3/19/2004
13:20:32
| RE: torque gains from exhaust
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Message:
Headers even with the restriction after allow a greater volume before the restriction to improve flow. Even the shorties have about 10 times the volume of the stock exhaust manifold. Mine work no doubt about it.
Real Horsepower
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