14 replies to this topic

[Heath]

I just dropped the tailpipe out of the green machine so now my exhaust is just exiting straight out of a flange about eight inches before the diff. I was thinking of making up some kind of exhaust turn-down, just through a small angle so it wasn't blowing directly at the axle tube and burning my paint etc, but I'm quite curious as to what effect this will have on the sound?

Obviously the risk with exhaust systems that are dumped before the diff is that they echo through the diff tunnel and under the car etc. So I want to keep that to a minimum basically. ATM the sound isn't too bad at all, it drones a little at low RPM (say 1500-2000ish) but not nearly as badly as I expected, and everywhere else in the rev range sounds fine.

I'd like to know what people thought (roughly) the best departure angle for that kinda thing is. Doesn't matter if it's a V8 or a six, as long as it is before the diff, because after then, predictably the effects will be much less noticeable. As systems that end before the diff are coming into fashion nowadays, I thought a fair few people may have mucked around with setups like that & might have some advice

Cheers

[dattoman]

Curious to know why you did it ?

[Heath]

lol are you expecting me to say "it will unleash a few kW so i can beat my mate's EL" or something? lol I just want it a bit louder basically. I might be one of only a handful here who actually enjoy the sound of a mild six, but that shouldn't alter the responses I'm after

I don't get hassled by cops, and my car was pretty quiet before (don't have a solid cammed 12:1 CR V8 that I need to shut up) so I thought I'd try it out without the tailpipe.

Edited by Heath, 21 March 2010 - 08:20 PM.

[76lxhatch]

Droopy end or not it won't make much difference to the sound, but worth directing the crap at the ground rather than the diff.

Bomber if you have a good way of making a side exit exhaust with proper mufflers that doesn't hang on the ground I'd love to know more, I haven't figured out how to get around the lower arms...

[Tiny]

What i found with the HQ when it had the twin 3" pipes dumped before the diff with small turn downs was the sound seemed to reverberate below the car more than when it faces straight out the back.

I think the sound waves hit the ground, reflect back up and reflect off the floor pan and repeat.

Definitely was louder, had more drone and was all around a PITA.
Especially if driving on dirt when you would sit up a big cloud just revving the car a bit!

My honest opinion would be to run a proper exhaust out the back with a nice set of extractors, 2.25" pipe and the right muffler.
My 202 had this system ( Hurricane Headers, 2.25" system and i *THINK* it was a redback muffler) and it sounded GREAT (in my opinion!) With the baby cam it was mistaken for a 253 ALL the time, was reasonably quiet at low revs (nice burble at idle), but when you stood it it just HOWLED!

That's my recommendation anyway!

[GML-31]

its not worth getting pulled over for heath, I do like the sound of a v8 dumped, never heard a 6... but I know up here its not legal anyhow but it doesn't stop anyone.

[Tiny]

Spot on Kev!

109.3 Db the monaro was checked at!

Neat $400 fine and a new exhaust courtesey of the EPA!

my 202 exhaust was loud, but i NEVER got hassled with that!

Cheers

[rexy]

Perhaps the carbon monoxide poisoning has already started given some of the above commentary.
Get a proper exhaust exiting as per the rules or be happy to fall "asleep" from CO toxicity.
R

[rodomo]

its not worth getting pulled over for heath

Hmmmmm...........now where have I heard that before?
I heard it coming 1/2 a klm away.