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      11-12-2018, 11:58 PM   #1
Catchmeifyoucanf90
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Eisenmann performance exhaust f90 slower?

Installed the axle back Eisenmann performance exhaust on my car. I also have the m performance "resonator delete" the mid pipe. Anyways, since i have installed the axle back Eisenmann performance exhaust on my car I feel as if the car has become slower 0-60. Was wondering if anybody else has felt this or has a clue. Thank you

Last edited by Catchmeifyoucanf90; 11-13-2018 at 12:08 AM..
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      11-13-2018, 06:46 AM   #2
onfireX5
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You won’t gain or lose power from a cat back. Are you using Dragy ?
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      11-13-2018, 08:53 AM   #3
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Have any videos of it?
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      11-13-2018, 12:56 PM   #4
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I've also heard this....its due to the back pressure the car feels sluggish.
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      11-13-2018, 01:58 PM   #5
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Not on mine
I have race version and none resonated mid Pipes
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      11-15-2018, 08:29 PM   #6
Catchmeifyoucanf90
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Quote:
Originally Posted by Ragazzi-07 View Post
I've also heard this....its due to the back pressure the car feels sluggish.
So have I actually lost speed in 0-60. I’m so curious I feel like I might just put stock back on. Not really impressed with the exhaust to be honest
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      11-15-2018, 11:03 PM   #7
Catchmeifyoucanf90
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Quote:
Originally Posted by Miko M View Post
Not on mine
I have race version and none resonated mid Pipes
Quote:
Originally Posted by Miko M View Post
Not on mine
I have race version and none resonated mid Pipes
Do you miss the electric value system? And can you still be quiet to be under the radar around cops
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      11-16-2018, 05:07 AM   #8
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Quote:
Originally Posted by Catchmeifyoucanf90 View Post
Quote:
Originally Posted by Miko M View Post
Not on mine
I have race version and none resonated mid Pipes
Quote:
Originally Posted by Miko M View Post
Not on mine
I have race version and none resonated mid Pipes
Do you miss the electric value system? And can you still be quiet to be under the radar around cops
I don't miss the valve control at all
If i drive around town or cops, i just switch to efficient mode ad D1 and it's half the noise
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      11-16-2018, 07:11 AM   #9
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Quote:
Originally Posted by Ragazzi-07 View Post
I've also heard this....its due to the back pressure the car feels sluggish.
The backpressure debate is a common myth on car forums-

http://www.gomog.com/allmorgan/exhaustbackpressure.html

3. How did the myth about back pressure and big pipes come to be?

I believe it is/was a misunderstanding of what is going on with the exhaust stream as pipe diameters change. For instance, someone with a Honda Civic decides he's going to upgrade his exhaust with a 3" diameter piping. Once it's installed the owner notices that he seems to have lost a good bit of power throughout the power band. He makes the connections in the following manner: "My wider exhaust eliminated all back pressure but I lost power, therefore the motor must need some back pressure in order to make power." What he did not realize is that he killed off all his flow velocity by using such a ridiculously wide pipe. It would have been possible for him to achieve close to zero back pressure with a much narrower pipe - in that way he would not have lost all his flow velocity.



Quote:
Originally Posted by Catchmeifyoucanf90 View Post
So have I actually lost speed in 0-60. I’m so curious I feel like I might just put stock back on. Not really impressed with the exhaust to be honest
Are the valves functioning correctly?
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      11-16-2018, 07:29 PM   #10
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Unless you have a leak, there should be no change in performance
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      11-16-2018, 10:06 PM   #11
Catchmeifyoucanf90
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Quote:
Originally Posted by Nate@IND View Post
Quote:
Originally Posted by Ragazzi-07 View Post
I've also heard this....its due to the back pressure the car feels sluggish.
The backpressure debate is a common myth on car forums-

http://www.gomog.com/allmorgan/exhaustbackpressure.html

3. How did the myth about back pressure and big pipes come to be?

I believe it is/was a misunderstanding of what is going on with the exhaust stream as pipe diameters change. For instance, someone with a Honda Civic decides he's going to upgrade his exhaust with a 3" diameter piping. Once it's installed the owner notices that he seems to have lost a good bit of power throughout the power band. He makes the connections in the following manner: "My wider exhaust eliminated all back pressure but I lost power, therefore the motor must need some back pressure in order to make power." What he did not realize is that he killed off all his flow velocity by using such a ridiculously wide pipe. It would have been possible for him to achieve close to zero back pressure with a much narrower pipe - in that way he would not have lost all his flow velocity.



Quote:
Originally Posted by Catchmeifyoucanf90 View Post
So have I actually lost speed in 0-60. I’m so curious I feel like I might just put stock back on. Not really impressed with the exhaust to be honest
Are the valves functioning correctly?
Not sure if the Valves are working correctly, there are times where there's barely any sound when I down shift, like dead quiet in sport + and everything open, but it's so inconsistent. Also have the m performance mid pipe
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