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Compensation for straight pipe

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Compensation for straight pipe

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  #1  
Old 05-23-2018, 12:18 PM
Jmikk
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Default Compensation for straight pipe

Hey all, i have this thing where my 5.9 ram has to be straight piped i love that roar. How do I bring my miles per gallon back up? Cold air intake of course cause the truck is exhaling and not really inhaling but beyond that what can I do to get back to that happy place at 12-13 and not 9-10.
 
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Old 05-23-2018, 01:02 PM
V65Ozzie
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Relatively speaking, deleting the muffler shouldn't have an effect on gas mileage. Now, if you have pulled the cat....that's a different ball game. Do you rev it at lights? That has a large impact on gas mileage.....
 
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Old 05-23-2018, 01:26 PM
Jmikk
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Originally Posted by V65Ozzie View Post
Relatively speaking, deleting the muffler shouldn't have an effect on gas mileage. Now, if you have pulled the cat....that's a different ball game. Do you rev it at lights? That has a large impact on gas mileage.....
cat is still there I just canít keep my foot out of it all the time. Trying to just even it all out so I can have my sound and enjoy it too
 
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Old 05-23-2018, 04:04 PM
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What year is your truck? Still have the pre-cat O2 sensor?
 
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Old 05-23-2018, 05:10 PM
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Originally Posted by HeyYou View Post
What year is your truck? Still have the pre-cat O2 sensor?
2001 1500 5.9 cat in tact with pre and post sensors in place and plugged in
 
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Old 05-24-2018, 12:25 AM
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Originally Posted by Jmikk View Post
cat is still there I just canít keep my foot out of it all the time. Trying to just even it all out so I can have my sound and enjoy it too
I think you answered your own question
 
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Old 05-24-2018, 02:28 AM
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Originally Posted by Aero540t View Post


I think you answered your own question
Exactly what I was going to say.
 
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Old 05-24-2018, 10:01 AM
Jmikk
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Originally Posted by Ramman18 View Post
Exactly what I was going to say.
i mean itís part of it but thereís got to e a way that I can drove this way and see higher numbers, with a glass pack driving the way I am I was seeing 13 and thatís still a straight through pipe so I donít understand why with the same habits and no muffler itís gone downhill.
 
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Old 05-24-2018, 12:27 PM
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So you're not really straight piped? Way I think of straight pipes are manifold to pipe down each side with maybe an x or H pipe for resonance but true duals.

If you have factory y-pipe and cat with just no muffler, I would suspect something else is causing your mpgs. I have Magniflow ypipe with glass pack and my power went up and mpgs stayed 12-13 city.
 
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Old 05-24-2018, 01:55 PM
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Unless your cats are plugged (literally) up they offer very little resistance. If your cats are unplugged (electrically) your system (OBD2) will stay in open loop mode and uses the preset maps in the computer. When these maps are used, it throws more fuel into the mix to keep it running smoothy until it gets warmed up and other parameters are met. Like a choke on carburetor, keeps it running rich until warmed up and uses a lot of gas. If ran this way (OBD2) for extended periods it will clog the cats reducing power. Haven't researched, if you can cut the aftercat O2 sensor out of the computer parameters then running without cats is no problem and will go into closed loop mode. It'll just pollute a bit more.
 
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