[DeTomaso] [SCPOCA] Breathing Better - Part 3 [5 Attachments]

[cengles at cox.net]

Dear Bill, 

Thanks for posting your candid results of the seductively easy muffler modifications that were beginning to lure me into just the set up that you have. I like outboard boat motors, but on the water........not on the road. As John says life is full of compromises. 

Warmest regards, Chuck Engles



---- bill gaino <gaino at earthlink.net> wrote:
> I run empty cans, 2 1/2 intermediate pipes, dual 2 inch outlet tips, GTS headers. It is free flow, but YOUR right... It sounds like an outboard boat motor. Bill 1362
>
> -----Original Message-----
> >From: John Taphorn <jtaphorn at kingwoodcable.com>
> >Sent: Jan 27, 2010 8:20 AM
> >To: Tomas Gunnarsson <guson at home.se>, detomaso at realbig.com
> >Subject: Re: [DeTomaso] [SCPOCA] Breathing Better - Part 3 [5 Attachments]
> >
> >Well, the consensus seems to be the sound w/o the baffles is unpleasant.
> >
> >The ID of the two resonator tips is ~ 1.5". The area is about 3.53". The
> >2.5" diameter exhaust pipe has an area of ~ 4.9" or a reduction in volume of
> >28%.
> >
> >Although it is more area than a single header tube.
> >
> >The world is full of compromises.
> >
> >JT
> >
> >
> >----- Original Message -----
> >From: "Tomas Gunnarsson" <guson at home.se>
> >To: <detomaso at realbig.com>
> >Sent: Wednesday, January 27, 2010 2:36 AM
> >Subject: Re: [DeTomaso] [SCPOCA] Breathing Better - Part 3 [5 Attachments]
> >
> >
> >> John,
> >>
> >> I predict a rather unpleasant sound from that mod. I've heard a car so
> >> modified and it's at the bottom of my sound list along with a car that had
> >> the muffler cans removed completely and had resonator tips only(!)
> >> attached to the pipes.
> >>
> >> Tomas
> >>
> >> ----- Original Message -----
> >> From: "John Taphorn" <jtaphorn at kingwoodcable.com>
> >> To: <MikeLDrew at aol.com>; <SCPOCA at yahoogroups.com>; <detomaso at realbig.com>
> >> Sent: Wednesday, January 27, 2010 3:36 AM
> >> Subject: Re: [DeTomaso] [SCPOCA] Breathing Better - Part 3 [5 Attachments]
> >>
> >>
> >>> That is an interesting bit of news. Initially, I thought - Darn it.
> >>> Then I realized the opportunity. I still have those baffles in my
> >>> exhaust. Aha, there is more power to be extracted from the 408!
> >>>
> >>> If one desired to remove the baffles from the chrome tips, does anyone
> >>> know of a process?
> >>>
> >>> Thanks
> >>> JT
> >>> ----- Original Message -----
> >>> From: MikeLDrew at aol.com
> >>> To: jtaphorn at kingwoodcable.com ; SCPOCA at yahoogroups.com
> >>> Sent: Tuesday, January 26, 2010 1:07 AM
> >>> Subject: Re: [SCPOCA] Breathing Better - Part 3 [5 Attachments]
> >>>
> >>>
> >>> JT,
> >>>
> >>> Beautiful work, BUT.
> >>>
> >>> Dan Jones did dyno testing with my gutted GTS mufflers, and found
> >>> minimal improvements (only 12 hp after performing a version of the Space
> >>> City modification).
> >>>
> >>> It turns out that the cork in the bottle, literally, is the four
> >>> resonator tips. You enlarged the inlet to the muffler, but the outlet is
> >>> substantially smaller. Use your higher college math and you can
> >>> calculate the area of the inlet pipe and the combined area of the two
> >>> outlets and you'll be shocked.
> >>>
> >>> The factory Gr3 exhaust system featured empty, gutted cans, and chrome
> >>> tips with NO resonators inside. I'm afraid that's the only way to make
> >>> the stock mufflers work properly.
> >>>
> >>> Mike
> >