Installed amp/sub and now rough engine, bad mpg - Dodge Challenger Forum: Challenger & SRT8 Forums
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post #1 of 115 (permalink) Old 07-05-2019, 10:47 PM Thread Starter
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Installed amp/sub and now rough engine, bad mpg

Recently had my 2018 SXT installed with 1600 max watt dual kicker subs with 2400w amp. After leaving the install place, I noticed sluggish acceleration, a significant vibration in break peddle when putting on brights, and MPG is markedly lower.

I don’t think weight is an issues, given the fact all the equipment was in trunk for over a week and no issue. I pulled fuse 29 to reset tranny and still the problem.

Is this something to do with the alternator? I don’t want the bass to hurt my baby, is there an easy fix to this?
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post #2 of 115 (permalink) Old 07-06-2019, 12:02 AM
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Unplug it and see what happens. Maybe they messed with something in the install.

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post #3 of 115 (permalink) Old 07-06-2019, 01:24 AM Thread Starter
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Unplug it and see what happens. Maybe they messed with something in the install.
As in disconnect it from the battery?
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post #4 of 115 (permalink) Old 07-06-2019, 01:41 AM
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Pull the fuse on the main power line. See if that helps. Also, out of curiosity, did you have a capacitor installed? Maybe some more detail on the install would help-but hopefully you are headed back to the shop to figure out what the deal is.
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post #5 of 115 (permalink) Old 07-06-2019, 01:48 AM
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I'd be going back to the shop, unless they are incapable of a correct install. What does the battery voltage show while you are running and feel sluggish? It's possible the amp is drawing too much power for the alternator?

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post #6 of 115 (permalink) Old 07-06-2019, 02:36 AM Thread Starter
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I had a dual 10” kicker compR sub (800rms/1600max) installed with a pioneer 2400 max amp with LC2i line output converter. No capacitor as I hadn’t expected needing one or if needed thought I could add later. Didn’t expect to see and notice such a difference in performance and Best Buy was closed (I know what your gonna say, but they did install which is insured) and I brought my own parts.

The sound itself seems to be fine, now the car is the issue. If it is the alternator, would a capacitor give it some help to go back to normal? Or would alternator be best?

Also, would alternator effect the performance and such? Sluggish acell, mpg, etc?


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post #7 of 115 (permalink) Old 07-06-2019, 06:23 AM
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Your voltage is dropping to low which is affecting the way the car runs and feels.

Since it's a V6 I'm not sure it's the 220 Amp alternator in my V8.

I have a cap but sometimes mine does drop when driving around town at a low rpm, and the car will drop rpms when the bass would hit hard.

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post #8 of 115 (permalink) Old 07-06-2019, 06:50 AM
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Have you tried driving with the audio off? If you still have problems, it is probably not related to alternator not being large enough. Unless something got damaged during the install I can't see how it is related. Anything affecting everything you mentioned would probably throw a trouble code.

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post #9 of 115 (permalink) Old 07-06-2019, 12:08 PM
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Have you tried driving with the audio off?
Besides wanting to know the answer to this question, your car either has a 160 or 180 Amp alternator. So maybe the installer thought you had something more powerful to handle the additional load?

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post #10 of 115 (permalink) Old 07-06-2019, 04:57 PM
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All the SXT come with the 160 Amp alternators, as far as I know

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