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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 09-24-2012, 01:01 PM
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manndhb3 manndhb3 is offline
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Unhappy Loss of LOW END TORQUE!!!

Anyone else here install JBA Shorty Headers and a Magnaflow Y on their truck(GEN 4) and notice a loss in pep during acceleration? On a positive note, I have def noticed that I am getting about 15ish MPG where I was getting about 12ish MPG depending on how aggressive I was driving!(all stop and go driving on a military post) Anyway, I was just curious to see how many people have experienced this. I would really like some input as to what I could do to get this low end back. Thanks in advance...
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Old 09-24-2012, 01:09 PM
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You usually loose low end tq with long tubes. Jba claims that you gain an extra 20 torques at 2100rpm. Wait for a tune to come out to get back anyb power you may have lost.
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Old 09-24-2012, 01:13 PM
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What size pipe before and after the y pipe?
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Old 09-24-2012, 01:20 PM
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manndhb3 manndhb3 is offline
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Quote:
Originally Posted by snrusnak View Post
What size pipe before and after the y pipe?
Same as before, 2.5 in 3 out
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Old 09-24-2012, 01:21 PM
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manndhb3 manndhb3 is offline
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Quote:
Originally Posted by thunder98110 View Post
You usually loose low end tq with long tubes. Jba claims that you gain an extra 20 torques at 2100rpm. Wait for a tune to come out to get back anyb power you may have lost.
I have the Shorty, not long tubes...I am pretty positive it is the Y that is causing the loss based on some other threads I have read.
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Old 09-24-2012, 01:24 PM
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That's surprising, I wouldn't expect any loss in torque with shorty's going in to stock size exhaust. The diameter of the pipe is mainly what controls exhaust gas velocity, which effects torque. With the longer and larger primary's you do lose some velocity but normally it's not noticeable with shorty's.
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Old 09-24-2012, 01:34 PM
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Do u have a cold air intake or different throttle body?
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Old 09-24-2012, 03:07 PM
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Yes I have a CAI and a TBS(just got it for the whistle and it was only 90 bucks)
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Old 09-24-2012, 07:01 PM
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Strange, I just installed JBA's, Flowmaster 50 series muffler, and K&N intake and noticed an MPG gain, but no low end loss. I don't have a Y pipe though.
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Old 09-24-2012, 07:12 PM
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maybe its leaning out a few points and needs to get a tad richer to compensate the additional flow.
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