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BMW 3-Series (E90 E92) Forum > E90/E92/E93 Marketplace (For Sale / Trade / Wanted) > Private Owners For Sale / Trade / Wanted > Non-turbo Engine / Drivetrain / Exhaust Parts > Eisenmann Race Exhaust for Sale



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      06-02-2006, 04:08 PM   #23
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      06-02-2006, 05:48 PM   #24
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I have only great things to say about Eisenmann

Ryan is a great guy

I am 100% happy with Eisenhaus
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      06-05-2006, 12:37 AM   #25
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i am thinkin on buying can u gime more info?
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      06-05-2006, 12:41 AM   #26
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PM sent like days ago, no replies yet haha
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      06-05-2006, 01:17 AM   #27
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i hear the thing closes for torque... on the 330 exhaust
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      06-05-2006, 03:33 PM   #28
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Quote:
Originally Posted by sunchild
i hear the thing closes for torque... on the 330 exhaust

Not true...
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      06-05-2006, 03:56 PM   #29
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Quote:
Originally Posted by sunchild
i hear the thing closes for torque... on the 330 exhaust
Quote:
Originally Posted by RYANM330CI
Not true...
The question of "what is the exhaust valve for?" has received so many different answers. The three answers I have received are:

(1) It modulates sound quality
(2) It closes at certain RPMs to attenuate the backpressure under conditions that would optimize torque.
(3) The combination of (1) and (2)

What Ryan at Eisenhaus said may be true. I honestly don't know the answer, because I need some objective proof. I am going to find out for myself once and for all.

I will run 3 Dyno pulls with my 330i, then I will disconnect and plug the line to the valve solenoid, and test again. I will post the results.

I also want to investigate ways to objectively quantitate the sound quality. This may prove to be difficult since I don't have a huge sound chamber with a decible meter. Anyone with ideas, please chime in.

Lastly, I will connect a vacuum gauge to the exhaust valve tubing via T-connector and see at what RPM the valve actually closes and reopens.
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      06-05-2006, 08:21 PM   #30
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Quote:
Originally Posted by ksfrogman
The question of "what is the exhaust valve for?" has received so many different answers. The three answers I have received are:

(1) It modulates sound quality
(2) It closes at certain RPMs to attenuate the backpressure under conditions that would optimize torque.
(3) The combination of (1) and (2)

What Ryan at Eisenhaus said may be true. I honestly don't know the answer, because I need some objective proof. I am going to find out for myself once and for all.

I will run 3 Dyno pulls with my 330i, then I will disconnect and plug the line to the valve solenoid, and test again. I will post the results.

I also want to investigate ways to objectively quantitate the sound quality. This may prove to be difficult since I don't have a huge sound chamber with a decible meter. Anyone with ideas, please chime in.

Lastly, I will connect a vacuum gauge to the exhaust valve tubing via T-connector and see at what RPM the valve actually closes and reopens.
Not a regular member here, but was reading through. The valve opens only in second gear onwards from around 3000 rpm, but I'm not 100 percent sure about the rpm. This is for acoustic purposes only (think of a trumpet) and torque isn't affected.

P.S. I had an internship at BMW SA in the acoustic section, that's how I know.
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      06-05-2006, 08:46 PM   #31
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Quote:
Originally Posted by warot
Not a regular member here, but was reading through. The valve opens only in second gear onwards from around 3000 rpm, but I'm not 100 percent sure about the rpm. This is for acoustic purposes only (think of a trumpet) and torque isn't affected.

P.S. I had an internship at BMW SA in the acoustic section, that's how I know.

You are right on the money


Some of you may not know this but I also work for Patrick BMW. I have been to BMWNA for some classes and they stated that the valve does not affect hp/tq

Cheers
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      06-05-2006, 11:16 PM   #32
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Quote:
Originally Posted by warot
Not a regular member here, but was reading through. The valve opens only in second gear onwards from around 3000 rpm, but I'm not 100 percent sure about the rpm. This is for acoustic purposes only (think of a trumpet) and torque isn't affected.

P.S. I had an internship at BMW SA in the acoustic section, that's how I know.
Quote:
Originally Posted by RYANM330CI
You are right on the money


Some of you may not know this but I also work for Patrick BMW. I have been to BMWNA for some classes and they stated that the valve does not affect hp/tq

Cheers
That's great info. Thanks!

A lot of companies do invest significant thought and engineering into the sound quality of their vehicles. I read somewhere that the current generation Mustang exhaust note was designed to emulate the modified 1968 Mustang featured in Bullitt. Nissan significantly engineered the exhaust sound of their current 3.5L V6 in the 350Z, G35 and FX35.

The Eisenmann and Kerscher exhaust systems actual sound good. They do not make the E90 sound like a boat (too loud and low pitched), a common problem with the in-line sixes with custom exhausts. The 4-bangers sound even worse (think of modified Hondas, WRXs and Evols).
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      06-05-2006, 11:57 PM   #33
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Sorry, typo. What I meant to say was that it closes, not open
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      06-06-2006, 12:02 AM   #34
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Quote:
Originally Posted by warot
Sorry, typo. What I meant to say was that it closes, not open
Right, I know what you meant.
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      06-06-2006, 08:52 PM   #35
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i have eisenmann race and i ended up just welding it, just to be 100% sure no leaks... either way is ok.
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      06-08-2006, 08:47 PM   #36
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still for sale guys!
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      06-08-2006, 10:43 PM   #37
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dude, i've sent u a pm like long ago...u didnt get it?
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      06-09-2006, 06:26 AM   #38
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Quote:
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dude, i've sent u a pm like long ago...u didnt get it?
I have no idea why I didnt see it; I just replied.
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