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00:45:01 - 04/25/2024
Dakota Performance
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jsatter
GenI
 
3/31/2001
14:20:42
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 Subject: Back Pressure
IP: Logged
Message:
How much is too little? How do you know when you've got too little? What will happen, etc? My first mod will of course be exhaust work. I'm planning on just getting some cat-back, but if I'm at it, why not go all the way up to the headers? With everything else stock, is it reasonable to go that far? I do intend to play with intake and get a new PCM doown the line.
James.
01 Quad Cab SLT Plus 2WD Auto 4.7L - Currently Stock
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RonW
Gen III
3/31/2001
14:45:57
| RE: Back Pressure
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Message:
If you're gonna exhale, you gotta inhale. If you don't keep it even, you may end losing power overall, or losing power at some part of your powerband. From the input side, there's intake, TB, intake manifold, valves, heads, pistons, cam, and crank. From the output side, there's heads, cam, valves, headers, cat, and exhaust. In the middle, theres the transmission, valve body, torque converter, driveline, and differential. In between all that there's money!
Ron
00 PB SLT QC 4X2 5.9 46RE 3.92 LSD
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jsatter
GenI
3/31/2001
14:47:47
| RE: Back Pressure
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Message:
Okay... I just read that twice... and both times it didn't answer any of my questions. =)
James.
01 Quad Cab SLT Plus 2WD Auto 4.7L - Currently Stock
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CanDak
Gen III
3/31/2001
15:15:50
| RE: Back Pressure
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Message:
Too little back pressure will cause some loss of power in lower rpm range but some gains in higher rpm range.Example, 1 1/2 inch headers with single catback makes better low end power and 1 5/8 headers with dual catback makes better top end power.
99 CC Sport 4x4, 5.2 Auto 3.55
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Bernd
GenIII
3/31/2001
19:26:58
| RE: Back Pressure
IP: Logged
Message:
From others who have played around with the 4.7L exhaust (including the aftermarket headers), there isn't any significant gains to be made. 3" from the cat on back is more than adequate...with a high-flow cat, there will be some loss on the bottom end with a little bit more power at the top.
Bernd D. Ratsch
1997 Dodge Dakota SLT
Supercharged w/Nitrous
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