[OT] Boom boom sound

[Eric Bryant]

> From: Peter D. Hipson [mailto:mail at darkstar.mv.com]
> Subject: Re: [OT] Boom boom sound
> 
> 
> Run rich, (idle mixture) and low back pressure exhaust 
> system, and you 
> should get some good popping! I get it all the time on my 
> Isuzu plow truck, 
> under those exact conditions, and have done it with other 
> engines, too.

My motorcycles will do this, and so will my Impala SS.  The bikes have
aftermarket exhaust systems with rather free-flowing baffles; the SS has
straight pipes from the cats back.  None of them did this with stock exhaust
systems, so a good "free-flowing" (read: loud) muffler setup is recommended.
I don't doubt that the bikes run rich on the overrun, but I kinda doubt that
the SS is dumping a whole lot of fuel in the exhaust (seeing that it's still
running near-stock PCM tuning, where as the bikes have been jetting into a
non-EPA-compliant state).

Eric Bryant
mailto:bryante at ghsp.com
http://www.novagate.com/~bryante 

  

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