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      03-28-2012, 03:13 PM   #1
WolfeS2K
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Stock VS Challenge Street X-pipe -Dyno Graph

I wanted to post this up. The one run was the best of three when the car was completely stock and the next was the best of three runs after install of the Challenge Street X-pipe. No other mods in between. Still have stock muffler

I want everyone to know that this x-pipe does work and you will not get any check engine light at all. The exhaust note is more aggressive too!
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      03-28-2012, 03:29 PM   #2
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Thanks for taking the time to Dyno our X pipe and sharing. Glad you are happy with the results too
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      03-28-2012, 03:30 PM   #3
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Quote:
Originally Posted by WolfeS2K View Post
I wanted to post this up. The one run was the best of three when the car was completely stock and the next was the best of three runs after install of the Challenge Street X-pipe. No other mods in between. Still have stock muffler

I want everyone to know that this x-pipe does work and you will not get any check engine light at all. The exhaust note is more aggressive too!
Congrats on the power bump! No CEL on the Street versions.
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      03-28-2012, 06:41 PM   #4
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Wow! That's crazy good success! I hadn't planned on doing an x pipe as I didn't think there are any gains. I may have to re-evaluate my build process.
Thanks for this!
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      03-28-2012, 06:50 PM   #5
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Quote:
Originally Posted by GTM_Challenge View Post
Thanks for taking the time to Dyno our X pipe and sharing. Glad you are happy with the results too
Do you have any sound clips of the street x-pipe with an otherwise stock exhaust?
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      03-28-2012, 07:34 PM   #6
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dyno charts with no other data make me sad panda.
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      03-28-2012, 07:43 PM   #7
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+1 on the x-pipe with stock exhaust sound clip
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      03-28-2012, 08:26 PM   #8
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very interested in this
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      03-28-2012, 10:21 PM   #9
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Quote:
Originally Posted by kitw View Post
dyno charts with no other data make me sad panda.
..


street version is a nice choice, but too bad it requires cutting to install...
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      03-28-2012, 10:23 PM   #10
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Thanks this validates my decision a while ago to install the Challenge "Street" X-Pipe with the Akrapovic Slip-on!! Also, passed State of MA Vehicle Emission Inspection, no problem.
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      03-28-2012, 11:25 PM   #11
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14 more whp while retaining the primary cat? that seems high. Most people are making that kind of gains with primary cat delete. Like in the Race version.
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      03-29-2012, 01:26 AM   #12
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I may have to re-evaluate my build process.
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      03-29-2012, 02:54 AM   #13
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You simply cannot gain that sort of power by removing the secondary CATs.
It just does not happen.

The primary CATs represent 7psi back pressure.

You can do what ever you want to the rest of the exhaust.
You cannot argue with the laws of physics.

The x pipe itself is the same diameter as the stock system and the resonators on the stock exhaust are completely straight through.

What this test is suggesting is a power gain of 15 whp from removing the secondary cats.

This is purely impossible.

Also, posting dyno graphs without any correction factor is a complete waste of time.

Dyno testing and knowledge has moved on alot and soon not only will correction factors have to be posted but also datalogs of the engine sensor readings.

I can clearly see one major anomaly with the graph.
Road speed on the first test is higher than the second which means there is a difference om how hard the car was strapped down.
It is clear the car is strapped down harder before the x pipe was fitted and this is what is causing a skewing of the results rather than an actual impossible power gain.

Sorry to come on here like this but I cannot stand by and watch people believe that removing the secondary cats gives 15hp.

The OP nor challenge are being pointed at here but the dyno operator.
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      03-29-2012, 03:41 AM   #14
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      03-29-2012, 10:15 AM   #15
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Quote:
Originally Posted by Sal@Evolve View Post
You simply cannot gain that sort of power by removing the secondary CATs.
It just does not happen.

The primary CATs represent 7psi back pressure.

You can do what ever you want to the rest of the exhaust.
You cannot argue with the laws of physics.

The x pipe itself is the same diameter as the stock system and the resonators on the stock exhaust are completely straight through.

What this test is suggesting is a power gain of 15 whp from removing the secondary cats.

This is purely impossible.

Also, posting dyno graphs without any correction factor is a complete waste of time.

Dyno testing and knowledge has moved on alot and soon not only will correction factors have to be posted but also datalogs of the engine sensor readings.

I can clearly see one major anomaly with the graph.
Road speed on the first test is higher than the second which means there is a difference om how hard the car was strapped down.
It is clear the car is strapped down harder before the x pipe was fitted and this is what is causing a skewing of the results rather than an actual impossible power gain.

Sorry to come on here like this but I cannot stand by and watch people believe that removing the secondary cats gives 15hp.

The OP nor challenge are being pointed at here but the dyno operator.
+1 Challenge offers a great product but the +15hp this dyno graph is showing can be very misleading to some when you are keeping the primary cat intact.
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      03-29-2012, 10:34 AM   #16
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Quote:
Originally Posted by cntgetm3 View Post
+1 on the x-pipe with stock exhaust sound clip
I will get a video made by this weekend of the exhaust for everyone.
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      03-29-2012, 11:09 AM   #17
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Sal,

The peak power gains looks a little higher than normal, so its possible there is a difference in how the car was strapped. I dont rule anything out. Our street x pipe removes the secondary cats as well has our own x section design, so its not just a cat delete only. Not sure how well you know our parts or not.



The gains for the majority of the powerband seem to be similar to another dyno done by a customer with our street x pipe at Active Autowerkes dyno. Here is the members original post link and the dyno below:

http://www.m3post.com/forums/showthread.php?t=435311

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      03-29-2012, 12:16 PM   #18
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Quote:
Originally Posted by kitw View Post
dyno charts with no other data make me sad panda.
Exhaust master....don't be a sad panda....what would you like to see?

Quote:
Originally Posted by Sal@Evolve View Post
You simply cannot gain that sort of power by removing the secondary CATs.
It just does not happen.

The primary CATs represent 7psi back pressure.

You can do what ever you want to the rest of the exhaust.
You cannot argue with the laws of physics.

The x pipe itself is the same diameter as the stock system and the resonators on the stock exhaust are completely straight through.

What this test is suggesting is a power gain of 15 whp from removing the secondary cats.

This is purely impossible.

Also, posting dyno graphs without any correction factor is a complete waste of time.

Dyno testing and knowledge has moved on alot and soon not only will correction factors have to be posted but also datalogs of the engine sensor readings.

I can clearly see one major anomaly with the graph.
Road speed on the first test is higher than the second which means there is a difference om how hard the car was strapped down.
It is clear the car is strapped down harder before the x pipe was fitted and this is what is causing a skewing of the results rather than an actual impossible power gain.

Sorry to come on here like this but I cannot stand by and watch people believe that removing the secondary cats gives 15hp.

The OP nor challenge are being pointed at here but the dyno operator.
Hey Sal,

How would you like me to set up the machine? We use the same Dyno so it wont be a problem to set it up the same way. I didn't use shootout mode since I never use that since it gives you a crank hp number instead of what the car is making at the wheels. I can run it in shootout mode but i wont have a stock to compare it since it wasn't run it shootout previously. Inertia was at the default of 100 and inlet air temp was used on the baseline as well as with the runs after the install. I know you dyno these cars alot more than I do mine so I'm certainly not questioning your knowledge. This is just what my independent tests show. I would be happy to test your x-pipe if you like since I am interested in going to catless setup.
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      03-29-2012, 02:59 PM   #19
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That's some awesome gain man,Congrats !
I have the Challenge Xpipe on my car and i loved it since day one. From power gain to Weld and fitting !

OP,DCT or 6MT ?
Octane Rating ?
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      03-29-2012, 04:50 PM   #20
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Quote:
Originally Posted by img View Post
That's some awesome gain man,Congrats !
I have the Challenge Xpipe on my car and i loved it since day one. From power gain to Weld and fitting !

OP,DCT or 6MT ?
Octane Rating ?

2008 DCT
Only use Shell 93oct and its pretty good gas from what I have been told.
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      03-29-2012, 08:39 PM   #21
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Quote:
Originally Posted by WolfeS2K View Post
2008 DCT
Only use Shell 93oct and its pretty good gas from what I have been told.

Thank you Sir and yes,Shell is great !
Enjoy the added power
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      03-29-2012, 10:27 PM   #22
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Quote:
Originally Posted by Sal@Evolve View Post
You simply cannot gain that sort of power by removing the secondary CATs.
It just does not happen.

The primary CATs represent 7psi back pressure.

You can do what ever you want to the rest of the exhaust.
You cannot argue with the laws of physics.

The x pipe itself is the same diameter as the stock system and the resonators on the stock exhaust are completely straight through.

What this test is suggesting is a power gain of 15 whp from removing the secondary cats.

This is purely impossible.

Also, posting dyno graphs without any correction factor is a complete waste of time.

Dyno testing and knowledge has moved on alot and soon not only will correction factors have to be posted but also datalogs of the engine sensor readings.

I can clearly see one major anomaly with the graph.
Road speed on the first test is higher than the second which means there is a difference om how hard the car was strapped down.
It is clear the car is strapped down harder before the x pipe was fitted and this is what is causing a skewing of the results rather than an actual impossible power gain.

Sorry to come on here like this but I cannot stand by and watch people believe that removing the secondary cats gives 15hp.

The OP nor challenge are being pointed at here but the dyno operator.
I love how its always straight facts with relevent data from Sal
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