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

[John Taphorn]

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
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