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post #1 of 10 Old 14th June 2008, 02:42 AM Thread Starter
JDS M5
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SS X-Pipe and Dinan Exhaust

I recenty go a SS X-pipe installed with my existing Dinan exhaust. I must say that this is the sound I was looking for. But, I have a question regarding a slight decrease in power. Has anyone recorded any power loss at the rear wheels with these mods? Is there too little back pressure, and I now need to add more flow on the intake? Any help would be appreciated.


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post #2 of 10 Old 14th June 2008, 10:13 PM
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Really, A Power Loss? Have you dyno'ed and seen this, or do you just feel a lack of power? I'd love to hear a video of the setup, I was always curious about that combination. I'm glad you're at least happy about the sound, but you should resolve the power thing?

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post #3 of 10 Old 14th June 2008, 10:55 PM
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I have the same setup. started with the dinan exhaust and then added the SS X Pipe. I did not notice any power loss.

2013 M5
Alpine White * Brand new... lots of mods to come!

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post #4 of 10 Old 15th June 2008, 05:12 PM
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I agree with bodaddy and get the car dyno'ed but this would only be of value if you had one from before to compare.
You do not need more back pressure. This thinking has been debunked here by others who know motorsports and automotive.
Naturally aspirated motors do not need the back pressure.
Run your car against another car you may have run before and see what gives.

Good luck, M5Ranger...Juan

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post #5 of 10 Old 15th June 2008, 07:08 PM
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Quote:
Originally Posted by M5Ranger View Post
I agree with bodaddy and get the car dyno'ed but this would only be of value if you had one from before to compare.
You do not need more back pressure. This thinking has been debunked here by others who know motorsports and automotive.
Naturally aspirated motors do not need the back pressure.
Run your car against another car you may have run before and see what gives.

Good luck, M5Ranger...Juan
You do too need back pressure with NA engines; with a freer flowing exhaust you loose Torque. Now since torque is derived from Horse Power (HP) if you are down on one, you are down on another, not peak but somewhere on the graph, usually low down on the scale. Hence loosing low end.

Power, hp= Engine Speed, rpm * Engine Torque, ft=lbf/5252

So I don’t know where this was "debunked", but certainly not by people who know motorsports or automotive...


Now going back to the OP's question. Yes, you might have lost tq (which people feel when they drive) but have gained HP in the upper portion of your rev range. However I am guessing not really much for you to feel that the mods were a mistake.

"Motion does not equal progress"...Cos
Malo periculosam libertatem quam quietum servitium...

Last edited by Cosmos; 15th June 2008 at 07:11 PM.
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post #6 of 10 Old 15th June 2008, 10:38 PM
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Cosmos, no intent to be confrontational but contact ASR Engineering or RPI and discuss this topic with them.
I do not pretend to be nor am I an expert in this motorsport/automotive subject. I am just a dumb $h!t who repairs peoples occludes arteries.
What I have said is from discussions with people much smarter than me on this subject.

The new ASR exhaust disspells this premise of back pressure. Totally free flowing, increase diameter to 3" entirely and with zero cats and a dramatic increase in hp and torque for a simple exhaust system. This totally defing the present premise. It made unbelieveable rwhp and torque.
For forced induction motors this is a different principle.

I do not remember the exact thread which dealt with this topic about 2 months ago.

Seriously my man, I am stating what I've been told by individuals who are qualified in this business. I do not wish to be confrontational as I initially said. That is not my intent.
my man,

M5Ranger...Juan

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post #7 of 10 Old 15th June 2008, 11:10 PM
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No worries.

"Motion does not equal progress"...Cos
Malo periculosam libertatem quam quietum servitium...
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post #8 of 10 Old 15th June 2008, 11:52 PM
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post #9 of 10 Old 15th June 2008, 11:57 PM Thread Starter
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The Sound is fantastic!

Quote:
Originally Posted by bodaddy View Post
Really, A Power Loss? Have you dyno'ed and seen this, or do you just feel a lack of power? I'd love to hear a video of the setup, I was always curious about that combination. I'm glad you're at least happy about the sound, but you should resolve the power thing?
BoDaddy,
The sound is absolutely spine tingling, no droning, just pure Fourmula 1 sounding. The power loss is very, very, slight, but it might just be me. The sound above 3000 RPMs is what I've been after since I got the car about two and a half years ago. I have to get out of my neighborhood very quickly otherwise people will start complaining. I don't need a dyno at this time, just more track time.

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post #10 of 10 Old 16th June 2008, 01:03 AM Thread Starter
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Quote:
Originally Posted by ThisFlyGuy View Post
have a soundclip of your setup?
I'm currently in Dallas on a startup, and will return in four to five days. I will work on the sound clip next week.


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