atb

I'm searching for the ultimate exhaust for my stroker project.

Ultimate to me does not mean ultimate power, I think I'm going to have plenty of that when the motor is done. I want the ultimate sounding exhaust note, and I'm willing to pay the cost of some additional horsepower in my quest.

I've heard a lot of different configurations, all displacements, N/A, S/C's and turbo'd.

Out of all the one's I've heard, one stands out above the rest.
Dennis Wilson's S4 with the full DEVEK exhaust. It has the DEVEK II headers, random cats, going into a single 3" pipe with a single flow master.

This 928 sounded very non-928, actually very non-V8. It had more of a ferrari V-12 (tinny) high pitched tone. Reminded me of a two stroke dirt bike with a sizeable stinger on it. The exhaust actually sounded a little corked up, but it was awesome.

1) Anyone care to venture (not the "V" word, but close) what part of the exhaust gave it this quality?

2) Any NorCal folks heard this combination on any local cars down there?

Other than my 928 Intl headers, I'm starting with a blank slate.

Tom. M

haha..find your local Italian Ferrari/Lambo mechanic and have him give you a recommendation on pipes... They are known for tuning by ear no?..
Later,
Tom
89GT

atb

Okay Tom, or should I now address you as Tomaso?

BC

You need a cross over, and to do that you need a dual exhaust, but it doesn't have to stay dual for long. You can exit out a dual in dual out. I did that with some spintechs. They were actually the only muffler on the car. It was loud, but it really screamed like an angry banchsee when you got on it.

That was the 2V though. The S4s seem always have a more mellow sound, whether loud or soft.

Tom. M

Haha...Tom for now until I get that Ducati 1098 ...then I'll go by Tomaso.. ...
what about the medusa headers that Tom Cloutier was offering...never heard them..but others have said the were quite unique sounding....

I remember Dennis Wilson's car now..yes..a unique sound coming from the pipes..no muscle car sound...more of a high end euro sound...I think we have a video of him at the Track Attack or somewhere that's worth a listen..I'll see if I can dig it up..

Later,
Tom

atb

BC wrote:
For optimum HP you do (arguably), but I'm thinking it's the Y-merge on Dennis' car that contributed to the unique sound.

Sterling wrote:
I do. It was awesome. The penultimate 928 sound. I thought the rasp was ballsy, but I can understand why you would want to take some of the edge off for the neighbors' sake. Louie has the borlas, although I haven't heard them yet. I'm sure the exhaust note will be great, but it's not the sound I'm after.

atb

Tomaso wrote:

THAT would be cool.

BC

I would be interested in that.

I thought Don Hanson at one point had a single 4"

atb

So for a 6.5 liter, what would be the correct size for a single exhaust, 4"?
Anyone care to make an educated guess?

Jim bailey - 928 International

The typical 90 degree V-8 with dual exhaust you hear the uneven firing of each bank .... two irregular 4 cylinder engines doing basically a bang skip, bang skip, bang skip, bang bang. However plumb the exhaust into a single loud pipe and you then hear bang bang bang bang bang bang bang bang.... Th old very brown 1980 with a track only test Y pipe and Borla rear exhaust SOUNDS like it is really spinning but it is just the more regular exhaust note that comes from a single pipe. Like it or not the simple FACT is a 5 liter 928 engine sounds just like any other 5 liter engine unless it has a flat crank like a Ferrari or IRL V-8. What makes a Harley sound like a Harley is the uneven firing of a V-twin it fires pause fires pause, pause, pause, pause, fires ,pause, fires. Since "Music" is typically just repeated patterns of random noise most people LIKE such things..... and now you know what I think about music !

BC

Louie did tests on single and Duals on stock sized motors.

http://www.performance928.com/cgi-bi...ss_parent=1125

tv

Mine doesn't sound like "just any other 5 liter engine", not even close either inside or out. Evrything will have an effect on the sound size of pipe, bends, placement of cats, muffler, tips.

I owned a 5 liter mustang gt and it sounded pretty good, but not anything compared to my 928 now. The tune state of the engine will also affect everything including the downhill idle sound.

Richard S

My S4 has Devek Level II headers, into high flow cats, merging into single 3" pipe, then 2 Borla's in-line. Not sure of which Borla's though. Sounds awesome. Dennis Kao has this set-up, minus the cats, and is quite a bit louder. The cats take just enough of the edge off. It "Barks" at start-up, then settles into a throaty growl. Open her up, and it becomes a mean snarl. Tons of compliments at DE days. Very liveable for everyday driving, which is VERY important for me.

Rich

atb

Looks like we cross posted on the last round BC. I think you're right, Don was running a 4" single.
I actually have Exhaust #2 on Louie's site that you posted, but I've got high flow cats also. I'm okay losing 5-6hp / 8-9 ft lbs going with a single exhaust, I don't really think I'm going to miss it on the average day.

Jim wrote:
This must be the effect that I'm after. I've heard other single exhaust 928's though, and Dennis' (PacNW'r who moved to Texas, not the other DW) definitely sounded distinct even from those. It must be in the Y-merge.

BC

A Single would be lighter. If one could control the sound and the resonance (I have an issue on the S2000 with resonance and still do - it makes driving a bear for your ears and head), then the 6hp can be made up somewhere else.