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      07-22-2009, 11:53 AM   #23
Imran@Evolve
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Here are the results from just the Akrapovic Evolution System

Flywheel figures for all those in Europe



And wheel power for all those stateside



Does what Akrapovic says it does - rare for manufacturer claims to match up to the real world these days.
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      07-22-2009, 11:56 AM   #24
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It is great that the numbers match up, and they actually tell the truth. They do not list numbers with ECU tune, just what they sell you.

-Andy
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      07-22-2009, 12:39 PM   #25
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Quote:
Originally Posted by Imran@Evolve View Post
Here are the results from just the Akrapovic Evolution System

Flywheel figures for all those in Europe



And wheel power for all those stateside



Does what Akrapovic says it does - rare for manufacturer claims to match up to the real world these days.

What about Torque gains??
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      07-22-2009, 12:58 PM   #26
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Torque gains are in the left hand axis. Pretty much 25 ft/lbs plus throught the rev range.
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      07-22-2009, 01:29 PM   #27
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Impressive gains!
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      07-22-2009, 02:45 PM   #28
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Torque gains are in the left hand axis. Pretty much 25 ft/lbs plus throught the rev range.

Nice, thanks. What do you reckon the gains would be on top of this with a good ecu tune?
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      07-23-2009, 12:39 AM   #29
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Donbona - what are your impressions of drone with this exhaust?
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      07-23-2009, 02:26 AM   #30
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Is there a drop between 2000-2500 rpm? Many other dynos of the Akrapovic show that.
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      07-23-2009, 03:30 AM   #31
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Donbona - what are your impressions of drone with this exhaust?
At standstill the car is very quiet.. there isnt much drone at all.. overall the exhaust system is almost perfect.
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      07-23-2009, 03:55 PM   #32
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Why is your graph cut off down at around 3k RPM's, and does not show any lower? I had mine dynoed today, and there is a big dip at about 2.5k. Did this happen to yours? The guys are assuming it was due to such a great flowing system, that the enginer leans way out (and it did), and take a second to compensate. This was verified by looking at the AFR's. Anyways, let me know if yours did the same thing. Thanks!

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      07-23-2009, 06:03 PM   #33
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Quote:
Originally Posted by askiles View Post
Why is your graph cut off down at around 3k RPM's, and does not show any lower? I had mine dynoed today, and there is a big dip at about 2.5k. Did this happen to yours? The guys are assuming it was due to such a great flowing system, that the enginer leans way out (and it did), and take a second to compensate. This was verified by looking at the AFR's. Anyways, let me know if yours did the same thing. Thanks!

-Andy

Did you get a tune as well? Other then the dip how were the power gains?
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      07-23-2009, 09:06 PM   #34
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Quote:
Originally Posted by askiles View Post
Why is your graph cut off down at around 3k RPM's, and does not show any lower? I had mine dynoed today, and there is a big dip at about 2.5k. Did this happen to yours? The guys are assuming it was due to such a great flowing system, that the enginer leans way out (and it did), and take a second to compensate. This was verified by looking at the AFR's. Anyways, let me know if yours did the same thing. Thanks!

-Andy
Fact is when you do down pipes of any nature, you really need to get an ECU remap designed specifically for down pipes (e.g. Powerchip Stage II).

I'd suggest the engine is still running closed loop fuelling around 2500RPM and ECU is not dealing with the changes in O2 sensor readings very well (since there are no longer any cats in front of the O2 sensors).
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      07-23-2009, 10:18 PM   #35
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ESS is working on a tune for the E92 M3 using my car. They are now working on one for the M3 with a high flow exhaust like this. We just thought is was crazy to see this dip, and everywhere else, it gained a bunch of power just like Akra claims. My graphs look nearly identical to these posted as far as the curve, and difference in stock vs Akra power.

-Andy
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      05-28-2010, 05:22 AM   #36
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Do you have any sound clips?
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