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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E36 (1991 - 1999)

E36 (1991 - 1999)
The E36 chassis 3-Series BMW was a huge hit among driving enthusiasts from the first moment the car hit the pavement. The E36 won numerous awards over the years it was produced and is still a favorite of many BMW enthusiasts to this day! -- View the E36 Wiki

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  #1  
Old 02-18-2013, 05:49 PM
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HakenTT HakenTT is online now
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Mein Auto: '91 E30
328i/M3 stock dual exhaust is horrible for performance

here is the picture from one of the catalytic converters from 96-99 328i/M3 mid section, element is only 2.5 inch wide, exhaust from the 3 cylinders is hitting this element at an sharp angle. Flow of this will equal straight 1.5 inch pipe. This is horrible.



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  #2  
Old 02-18-2013, 05:54 PM
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What would you recommend as an exhaust? There is an approvement compared to the 325/obd1 M3 right?

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  #3  
Old 02-18-2013, 06:10 PM
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compared to other factory exhausts, the //M3 is heavy, but flows well. aftermarket units are nice because they do tend to have less sharp angles, a factor when considering mass produced vehicles, and are lighter. however, from what i have seen, these can be just as pricey, if not more, than oe components.

that being said, the obd2 pipes are more free flowing than the obd1 counterparts since there is no pinch @ the cat.

also the dual pipe design all the way back is another factor to consider. when converting to a signle pipe design, one needs to consider this, as well as the wall thickness (bmw oe pipe is rather thick) and how it affects the scavenging affect closer to the exhaust manifolds.

i have a modified obd1 pipe with a high flow cat, to a single outlet. my butt dyno has not recorded any loss of power, but since i didn't make a before video i cannot claim for certain exactly how much hp and tq i have gained.


but it feel like a lot....



df
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Old 02-18-2013, 06:42 PM
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southpark11235 southpark11235 is offline
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I have both a 328 and 323 exhaust in my basement right now. Does anyone know a way that I can test the flow of both exhausts and end this debate?
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Alex//1999 323is - power e46 M3 seats, style 43 rims, 328 exhaust, Z3 rack, Bilstein PSS coilovers

“We got about ten minutes before this entire county is up in flames. If you want to live, you’d better step on the gas! Oh wait is this a Tesla? Sh!t! Well, step on the prissy peddle, we're going to die!” – Cartman
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Old 02-18-2013, 07:02 PM
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Mein Auto: '96 328iC, '04 325Ci
Duct tape a leaf blower on the front end and the biggest trash bag you can find on the other. Measure the time it takes for each to fill the trash bag. It's crude but it's quick to rig......
If you want something more objective use the same leaf blower but you'll need to rig a T fitting of some type off the front end to connect a pressure gauge that can measure low pressures. This is a direct measure of back pressure and whichever exhaust measures the lowest reading flows the best.
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Old 02-18-2013, 07:23 PM
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If I measured the back pressure on both 328 pipes, then add the two numbers together and dived by 4. Would that give an accurate reading?
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Alex//1999 323is - power e46 M3 seats, style 43 rims, 328 exhaust, Z3 rack, Bilstein PSS coilovers

“We got about ten minutes before this entire county is up in flames. If you want to live, you’d better step on the gas! Oh wait is this a Tesla? Sh!t! Well, step on the prissy peddle, we're going to die!” – Cartman
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Old 02-18-2013, 07:52 PM
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Quote:
Originally Posted by southpark11235 View Post
If I measured the back pressure on both 328 pipes, then add the two numbers together and dived by 4. Would that give an accurate reading?
That should do it!
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Old 02-18-2013, 08:05 PM
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Quote:
Originally Posted by southpark11235 View Post
I have both a 328 and 323 exhaust in my basement right now. Does anyone know a way that I can test the flow of both exhausts and end this debate?
There's no debate of 323 exhaust vs 328 exhaust. 328 is obviously better, and nobody that knows what they're talking about will disagree. You don't have to waste your time testing it.
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Old 02-18-2013, 08:29 PM
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southpark11235 southpark11235 is offline
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Quote:
Originally Posted by dc_wright View Post
That should do it!
Great, I order a cheap little air pressure gauge off eBay. It should be here next week. As soon as it comes I will do the test and post the results.
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Alex//1999 323is - power e46 M3 seats, style 43 rims, 328 exhaust, Z3 rack, Bilstein PSS coilovers

“We got about ten minutes before this entire county is up in flames. If you want to live, you’d better step on the gas! Oh wait is this a Tesla? Sh!t! Well, step on the prissy peddle, we're going to die!” – Cartman

Last edited by southpark11235; 02-19-2013 at 05:55 AM.
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  #10  
Old 02-19-2013, 05:54 AM
RawrRawr RawrRawr is offline
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It should be here next weak.
Please fix this, kind sir..... It bothers me, oh so much. It's like how people spell brakes as breaks.
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  #11  
Old 02-19-2013, 09:48 PM
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Quote:
Originally Posted by RawrRawr View Post
It should be here next weak.
Please fix this, kind sir..... It bothers me, oh so much. It's like how people spell brakes as breaks.
Replace your suspension, cooling system and do a manual swap!

It bothers me, oh so much!









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