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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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  #1  
Old 12-24-2013, 11:19 PM
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Default Throttle RPM pulsating due to Diablo Intunes shift points?

When light on the throttle my truck pulsates in the exhaust note until I let off or give it more gas. Very annoying and wondering if anyone e
Se has this issue. Running 87 tune ATM on my 5.7 2010 1500
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  #2  
Old 12-25-2013, 05:45 AM
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Hey Bcera, sounds like valve overlap with Rich a/f mixture. Running rich will have that effect Also I'm not sure if you have an aftermarket exhaust but that will def make the exhaust note louder.

I would check a/f ratio, Idle point, fuel pressure or try returning the truck back to stock map and re-map.

I'm sure some guys will chime in and help, but if its running and driving you around I think your fine.
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Old 12-25-2013, 12:25 PM
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Did you disable mds sounds like its on and you notice it with an open exhaust
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Old 12-25-2013, 12:35 PM
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Sounds like MDS kicking in with aftermarket exhaust.
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Old 12-25-2013, 01:49 PM
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MDS with the aftermarket exhaust was my first thought as well.
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Old 12-25-2013, 09:53 PM
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It's not MDS, that's only activated during load when the PSM detects suitable conditions, so 35-what ever speed your traveling consistent. allowing great gas mileage.
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Old 12-25-2013, 10:06 PM
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Quote:
Originally Posted by ericlee9386 View Post
Did you disable mds sounds like its on and you notice it with an open exhaust
Yes mds is shut off
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Old 12-25-2013, 11:49 PM
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Quote:
Originally Posted by Bcera View Post
Yes mds is shut off
Next question would be does it only do it around town when the truck is in O.D? Try seeing if you drive around in a lower gear if it still does it
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