My brother and l were at the track last Friday night and there were two new super stock cars racing. One copo and one cobra jet. My question is, why are they so much louder than other cars with a lot of compression, cubes, etc? They seemed as loud if not louder than a top alcohol car! Do they give these things a splash of nitromethane or something? Just curious. Sorry ahead of time for not being Mopar related.

The new COPO and Cobra Jet that are supercharged, are very loud.

I forgot to add that yes they are supercharged. Just curious as to why are they so loud? Other supercharged cars are not anywhere near that loud lol

Supercharged cars are always louder. I can always hear one.
Doug

All that cyl pressure makes a bigger BOOM

They're putting twice the fuel-air in than normal cars, means a bigger bang.

Back in the mid 1960s to the mid 1970s I notice on a lot of N/A door slammers at the tracks that the cars that made a lot of noise didn't E.T. or MPH as well as the quieter ones did with the same models, classes and motors with open headers I learned later that retarding the cam, or not degreeing it in to start with, will kill the bottom end and make more noise than the same cam advanced does
IHTHs

I just don't think I've ever heard supercharged cars so loud before in my life like this. (Except a top fuel car).

LOL, I never thought I would see "stock" Challengers, Mustangs and Cameros run in the eights either!

Me either lol! They are fun to watch that's for sure.

These cars do run good but I wouldn't go as far as to say "STOCK".

I can't speak to the COPO's, but the Cobra Jets will run low 9's right off the showroom floor. Need to start spending money to get them near class records though.

Actually, they are surprisingly stock for the ETs they run. We recently had a Mustang on the chassis dyno at Holley. The thing was a beast with just a well built stock motor and a good tune.

As you know, air flow is KING and these things have it.........plenty of it

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These cars do run good but I wouldn't go as far as to say "STOCK". [/quote]

Well they do run Stock Eliminator...

These cars do run good but I wouldn't go as far as to say "STOCK". [/quote]

Well they do run Stock Eliminator... [/quote]


And that means what? Stock Eliminator is FAR from stock for the top runners. The cars mentioned above are at Keystone Raceway Park testing and tuning and changing set-ups. He who cheats the bestest and doesn't get caught run the fastest. I had a set of "stock" small block mopar heads on my flowbench and was shocked by what I saw. And haven't seen it since.

I don't think any other race is as loud as RE amemiyas GT300 Car. It made your ears bleed, even when it was on the back straight on the back side of the track behind the stands. And it's naturally aspirated.