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Custom Dodge Ram Performance Mods - Engine - 4.7 Liter V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 4.7-liter V8 engine - 310 horsepower, 330 lb-ft of torque.


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  #1  
Old 11-12-2010, 10:13 PM
Thetolleyman Thetolleyman is offline
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Default Added Magnaflow Cat back and lost some low end!

Okay, so I installed the Magnaflow dual cat back system on my 03 4.7L today. It sounds great but I can detect a power loss under 2500 rpms. Once it gets over that it pulls hard, which is exactly what the Magnaflow Dyno chart says it should do. Of course as a daily driver, I rarely take the rpms that high.

Any way to add back a little back pressure to the system without totally removing it? Something I could add "inline" maybe?

Does the computer take a while perhaps to adjust the lower back pressure?

Next purchase is a Superchips programer, we'll see what happens there.
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Old 11-13-2010, 09:02 AM
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That's to be expected. Anytime you free up the exhaust you're going to lose some of that bottom since a little backpressue helps with making torque. Adding something to increase backpressure defeats the purpose of adding a free flowing exhaust. Backpressure isn't something that the PCM can do anything about.
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Old 11-13-2010, 09:25 AM
Thetolleyman Thetolleyman is offline
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I was afraid of that! No big deal, I was looking for great sound and dual appearance anyway. I hope it doesn't hurt my fuel economy, anybody have experience there?
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Old 11-13-2010, 12:32 PM
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Default

I had the same issue when I went from the stock single exhaust to Magnaflow dual exhaust. I believe it was do to the computer re-learning the new flow characteristics. After I ran a tank of gas through it the performance seemed to be back & it now pulls all the through the rpm band and the gains are def. felt in the high end. The same thing happened when I did my intake as well. At first, I thought something was wrong because the truck performed worse, but after a week or so of normal driving the gains came back.

As far as the fuel economy, it's all up to how you drive it. If you're heavy on the gas, you will loose economy, but if you drive it easy off the line, you will see a small gain. (Key word SMALL).
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Old 11-13-2010, 04:47 PM
Thetolleyman Thetolleyman is offline
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I hope thats true!
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Old 11-15-2010, 03:04 PM
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i've had the same problem after I added my Super 44 Dual Out system. I've been just trying to save money so that I can get a good intake system to create a little back pressure. Just can't afford it yet, especially with xmas coming around, man it's going to be a while. But I assume that should help with adding back pressure.
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Old 11-15-2010, 04:33 PM
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I've got the K&N on there now.
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Old 11-15-2010, 04:47 PM
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Quote:
Originally Posted by 02haynram View Post
i've had the same problem after I added my Super 44 Dual Out system. I've been just trying to save money so that I can get a good intake system to create a little back pressure. Just can't afford it yet, especially with xmas coming around, man it's going to be a while. But I assume that should help with adding back pressure.
Did someone tell you adding a CAI would add backpressure to the system?
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Old 11-15-2010, 06:19 PM
Thetolleyman Thetolleyman is offline
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Oh no. I had the CAI installed prior to the exhaust system. So I can't tell you if it is worse without it.
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Old 11-15-2010, 07:35 PM
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I'm pretty sure that an intake has absolutely nothing to do with back pressure.
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