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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #41  
Old 01-10-2012, 11:18 AM
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My friend has a 2011 with more mods than my truck without a tuner, and it definately moves like a modded truck. The only thing you can't do to a 2011 is forced induction, everything else is fine. You would get a little more from all those mods with a custom tune, but it's not necessary. And you can't turn off the rear O2 sensors on longtubes, so you might get a check engine light. It doesn't compensate in a bad way either, it adjusts the fuel to match incoming air, at a safe ratio. It will run richer than with a tuner, and that is to prevent engine damage. All the tuner does is advance timing to make a little more power and lower the A/F ratio below what the factory PCM would.
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  #42  
Old 01-10-2012, 02:51 PM
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Originally Posted by JCummings View Post
you guys are posting all kinds of great information but does anyone have any sound clips from inside the cab?
Not a varam but the k&n shitty cell phone and the whistle is not from the cai its from that stupid short ant thats getting replaced.




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  #43  
Old 01-10-2012, 08:33 PM
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It doesn't compensate in a bad way either, it adjusts the fuel to match incoming air, at a safe ratio.
Timmy where'd you get this info? as far as I know the downstream O2 sensor(s) do not effect a/f ratios. I have seen other reports saying they do only on chrysler vehicles, but never seen proof of this.
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  #44  
Old 01-10-2012, 08:45 PM
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I am pretty sure it is just the first set, but I am only going off of what I remember hearing. The PCM keeps the engine in a safe range of acceptable A/F ratios. If you add more air, it will be lean and the PCM will add a little fuel to keep it safe. The IAT sensor helps the PCM calculate air flow. MAF systems actually measure flow rate into the throttle body...just a different way of doing it. I'll look into the O2 sensors for ya!
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  #45  
Old 01-10-2012, 08:53 PM
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I am pretty sure it is just the first set, but I am only going off of what I remember hearing. The PCM keeps the engine in a safe range of acceptable A/F ratios. If you add more air, it will be lean and the PCM will add a little fuel to keep it safe. The IAT sensor helps the PCM calculate air flow. MAF systems actually measure flow rate into the throttle body...just a different way of doing it. I'll look into the O2 sensors for ya!
Thanks! Yeah the way I understand it is the upstream sensors are for a/f ratios, and the downstream O2's are for monitoring catalytic efficiency. I have heard though that on Chrysler vehicles the downstream O2's have some effect on a/f ratio's, but I don't know that I believe that...
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  #46  
Old 01-19-2012, 05:55 PM
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My intake is ordered!!! thanks for the help guys. I have one more question for those who have painted these with good results. What steps did you follow to get good adhesion? Did you use high temp paint? Clear coat? Primer? Lastly, does anyone know what color orange was used on the gen 3 vararam intakes? i think that color looks real good and will try to replicate. again thanks for all of the help your knowledge is invaluable.
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