Mufflers for the long drives

[ksj2]

Corona del mar? LOL. Truly different.How many days?

[CDMBill]

Yeah, we see those every day here.

[Beagle]

Tardis454 turned us onto those things a couple of years ago. The Japanese kids get pissed at regulations about old cars and go straight over the top to piss off authorities with them. There's a lot of political statement in it. Bosozuku as a search word in your search engine will get you some insane stuff.

There's a ton of trucks around here that are straight piped after the turbo... Turbos make great mufflers. The trucks really aren't that loud. Mine is straight 3" pipe from the back of the turbo to the back bumper, it's pretty quiet.

Question / thought - An engine purpose built for a turbo setup I can't see being all that loud. The cams are usually not crazy overlap and the compression is usually not all that high? Or am I high?

This brings up the whole collector question for me too. Let's say I run a set of pipes to the bumper, x-pipe, 2.5" turbos (aerochambers) and I'm thinking about dropping the x-pipe if it's worth more than .15 or so... I'm wondering if it makes more sense to drop it after the x-pipe or pull the whole section and put 18" or so of collector on it or if on a less than 400 hp car if it even makes any real difference?

[CDMBill]

High quality X-pipes seem to make power, or at least not hurt it, for any level of car I've seen them installed on recently. I built my headers with essentially no collector for packaging reasons and the collectors are part of the x-pipe set-up which is all one piece. When I 'uncork' it I'm removing the pipes that extend from the outlet side of the X, the mufflers and the over axle tubes, resonators and tips. It's entirely possible that straight collectors might make more power at the track, but I used ovalized frame clearance tubes that angle towards the middle before the X so I don't have the choice. As somebody pointed out earlier having the muffler as far away from the engine as possible apparently helps both noise and power. I have no data on this but it makes intuitive sense.

Turbo cars homogenize the sound especially with full exhaust so not much muffler is required, IIRC the whole reason there are so-called turbo mufflers is that GM developed them for the turbo charged Corvairs in the early '60's.

[Bob Holmes]

My beast is turbocharged, would still make my ears bleed.

[Beagle]

My beast is turbocharged, would still make my ears bleed.

four cylinders will do that...

[Bob Holmes]

so sorta like a twin turbo V8...

[Beagle]

Knew there was a reason I was gunning for a big single. Cough. lol. How big was that pipe on a 140 ish cube mill Bob?

I'd sure like to get the math on harmonics and how exhaust pulses influence a large single pipe v. rpm v. pulses / min or something. I adore a six and it irritates the hell out of some folks. I love a four, fwiw Bob, and was just messing with you. Two fours at 90* intervals? Slobber... drool. I can hear them distinctly although a single exhaust on a V8 makes it sound so much different.

I frequently wish I was closer, I'd pony up for a splitter off of that four, divide the single back through a pair of motorcycle mufflers and see what that sounded like. I don't think something Hyabusa sized would clamp down too many HP? not sure. I'd be curious to see.

[Bob Holmes]

3" tube.

[Bob Holmes]

Of course a 4 cylinder is a flat crank with a different pulse than a 90* V8. That V8 burble is missing.

[bulletproof]

just installed my spintech prostreet 6000 series mufflers.... no more ear plugs for me.... i had the bullet 12" race mufflers hated the way it sounded,,imagine a sbc powered woopie cushion...