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FG XR8 exhaust 

 

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 Post subject: FG XR8 exhaust
Posted: Sat Aug 16, 2008 5:21 pm 
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just thought id put up the photos of the factory exhaust. (showing that solenoid)
not the best in terms of engineering and flow, but it sounds alright.

in the photos note a few things, the solenoid, the strange crossover design, and the 3" factory rear section.


that weird solenoid in the muffler
Image

twin 2.25" (?) with the strangest "crossover" ive seen - its like a 'H' not the usual 'X'
Image

then goes to 3", so thats a bit more respectable :)
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Posted: Sat Aug 16, 2008 7:48 pm 
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Ive seen quite a few cars with the "h" crossover, its there just to balance out pressure and nothing else where the "x" crossover is there to do the same but also promotes exhaust scavenging too.

But yeah also the restrictin (if there is any) would be in the 3" rear that the twin 2.25" section as when you do the maths the twin 2.25" has a larger area than the 3".

But also, Do you have a sound clip yet Matt? I bet it sounds better than the EF on the Gate! :D

 

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Because of Beer, Thirst is a Beautiful Thing!

'95 EF XR8 auto, Advance headers, 3" exhaust, Cobra manifold, BBK 75mm throttle body , 80MM Marauder MAF, Vortech V2 T Trim , 307 rwhp, 405 ft/lb 13.2 @ 105 MPH

Now N/A (permanent Lag) - AFR 165's, Comp XE270 cam, 1.6 RR - 269 rwhp 14.1 @ 102mph.

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Posted: Sun Aug 17, 2008 12:14 am 
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yeh my car has the 'H' bit in the middle thought it would be the same as the 'X' crossover. sound file already!

 

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Posted: Sun Aug 17, 2008 2:38 am 
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schnoods wrote:
But yeah also the restrictin (if there is any) would be in the 3" rear that the twin 2.25" section as when you do the maths the twin 2.25" has a larger area than the 3".


doubt there would be much restriction in a 3 inch piece at the tail. its good to downsize the pipe towards the back as it keeps flow rate up, without bothering flow too much (will a little at full noise). towards the back gasses begin to cool and become dense. if it were twin 2.25 all the way to the back the flows would slow a lot more at lower rpm, resulting in a loss of lower rpm torque, but gaining higher rpm power.

I guess ford shot for the middle mark with the flow at the front and velocity at the back.

 

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Posted: Sun Aug 17, 2008 2:42 am 
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Yup like i said (if there is any).

But they have come along way in a few year with exhausts, ill never forget the first time i saw the crushed tube headers. :roll:

 

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Because of Beer, Thirst is a Beautiful Thing!

'95 EF XR8 auto, Advance headers, 3" exhaust, Cobra manifold, BBK 75mm throttle body , 80MM Marauder MAF, Vortech V2 T Trim , 307 rwhp, 405 ft/lb 13.2 @ 105 MPH

Now N/A (permanent Lag) - AFR 165's, Comp XE270 cam, 1.6 RR - 269 rwhp 14.1 @ 102mph.

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Posted: Mon Aug 18, 2008 12:14 am 
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The H-pipe is actually the most common setup. Besides, ive never seen a discernable difference between H and X configuration pipes. Usually this is because the advantage is gained by having the pipe from each side join together as close to the engine as possible.
It's easier to get a H-pipe closer to the engine than an X-pipe.
I think that's a pretty good exhaust for a factory car.
Those mufflers are sold in the Ford racing catalog.
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