How much louder with cam
How much louder with cam Thinking of going with LMI's over my LMII's but I was wondering how much louder a cam will make the car. I've heard people say that it makes it significantly louder, so I was holding off before doing a louder exhaust and then thinking it's way too loud. The cam will be a G5X3 on a 114LSA. Car has LT's with hi-flow cats. Thanks folks!
yeah id say about the same thing when i went from stock to a 233/239 114 lsa cam idle was alot louder and driving through the rpms was a little louder but not too much until you romp on it then its wicked loud. But just fyi before my heads and cam i never got pulled over for loud exh now i do all the time and i have full exh cats and muffler.
It also depends on what cam you are using. As cams with larger LSA (114+) will bleed off some of the cyl static compression and as compared to a cam with a smaller LSA (110-112) cause a louder exhaust sound or tone.
Compression ratio and duration also come into play. I changed my cam a few times in my 84' z28 to a small one (and larger one) and lost a few DB's in noise.
But in general.. bigger cam, louder noise.. !
Compression ratio and duration also come into play. I changed my cam a few times in my 84' z28 to a small one (and larger one) and lost a few DB's in noise.
But in general.. bigger cam, louder noise.. !
Originally Posted by jmm98LS1
but not as big of a difference as when idling.
The G5X3 will give you around 10-14° of overlap ( I don't know the exact duration, but I believe it is around 242/240ish). It is not that it is louder, but the fact that there are small quiet spots that give it that inconsistent idle note. That quiet spot is known as a valve overlap. That is why it seems louder. Click the true dual link in my sig. I have a 16° overlap'd cam on a 115. It is all the valve events that determine the lope. Simple math really. Just about anything over 5° will have some chop to it.
Here is my cam for example: 244/248 .595/.595 115+2
Duration + Duration = Sum of Duration
Take that sum and divide it by 2.
Multiply the LSA by 2 = XXX
Take that number and subtract the LSA x 2 from it.
The final number is your overlap. Be it positive or negative.
244 + 248 = 492
492 divided by 2 = 246
115 x 2 = 230
246 - 230 = 16
16 is the valve overlap.
Here is my cam for example: 244/248 .595/.595 115+2
Duration + Duration = Sum of Duration
Take that sum and divide it by 2.
Multiply the LSA by 2 = XXX
Take that number and subtract the LSA x 2 from it.
The final number is your overlap. Be it positive or negative.
244 + 248 = 492
492 divided by 2 = 246
115 x 2 = 230
246 - 230 = 16
16 is the valve overlap.
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Originally Posted by sidewayz28
what do you mean? when your cars sitting idle, you can hear the cam the most.. its going to be probably super loud with a loud mouth set up.. my TDs can get scary loud
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