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Discussion Starter · #1 ·
I just put a cold air intake onto my car, and it sounds great when I'm driving and I floor it. Has a really good sound to it. Usually around 5000-6000rpm. However, when people say "Let me hear what it sounds like", and I go to rev the engine, I can never get that sound.

Is it because the car is capping at 4000rpm? or is there another reason? I would love to be able to give people a preview of the sound without have to be driving at 60mph.
 

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It's because there's no load on the engine when revving in neutral. :)


Sent from a cool, little device from the future.
 

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Discussion Starter · #3 ·
Would electrical exhaust cutouts be something to look into?
 
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With the drive-by-wire throttle systems on these cars you'll never get anywhere close to full throttle opening when revving in neutral. No throttle opening means no air in, means no loud noise. Not really any way around it.
 

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Would electrical exhaust cutouts be something to look into?
Like others have said on this forum they are pretty much a novelty and an expensive one to boot...as far as sound goes it really depends on where you put them...the mid's would be the loudest but what the actual tone is like is subject-able and what sounds good to you may sound like an old rusty exhaust to another, best over all placement would be where dodge opted for the cat, right before the the first set of mufflers...the right way for max loud would entail long tube headers and cat-less mid's just be prepared to switch them out for emission testing every two years at first then every year after that if you want street registration...2 cents
 

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The sound comes from burning fuel. When you rev a car in neutral, it's not burning any fuel to speak of. In fact, challengers sound their worst when people do that, so please don't do that.
 

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...and the real answer is...these cars are rev limited when in neutral to about 4,500 rpms unless that feature is defeated by a tuner.

The sound you're hearing with a CAI is the engine sucking in air.

It's really not the best idea to rev any engine to extreme rpms without a load on it. You'll soon be sending pieces of your piston rods through the engine block. Those yahoos who go around revving wide open are, shall we say, unwise and annoying. It's kind of like the scene in "Enter the Dragon" when the caucasian guy tries to impress Bruce Lee by hitting a board and breaking it. Bruce responded, "Boards don't hit back." High revving doesn't impress those who know better and, in fact, only proves the person doesn't really understand what they're doing.
 
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I'll throw this curveball in there...it depends on how you rev in neutral, as far as getting a ferocious sound. As others above have noted, engine load is an important factor to be present, and the engine load is very light while in neutral (essentially, friction of lubricated metal engine parts is the only load). However, there is a short moment where engine load can be appreciable, right at the beginning of poking the gas pedal. In that scenario, the engine load is its own inertia as it goes from idle rpm to some higher rpm. So if you rapidly go from idle to 3000 rpm or so, the rotational inertia of the moving parts of the engine will be appreciable, which will present a temporary engine load. So give a healthy poke to the throttle, just long enough to give a quick rise in rpm, but not so uncontrolled it spikes up to hit a rev limiter. The goal is to leverage inertial engine load at the very beginning, and then letting the rpms fall back to normal idle. I believe you will be employing enough throttle at that point to give a very nice sound. ;)
 

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