#171  
Unread 07-27-2010, 12:45 PM
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Default Re: Vorshlag 1991 BMW 318is

Ever since McCall added the stainless header to the E30 its been really loud. I mean, sure, it wasn't quiet before with the 2.25" Magnaflow straight-thru style muffler, Magnaflow OE replacement catalyst, and turndown just at the rear axle, but it was bearable.


Above picture shows the exhaust on the car when we bought it in 2007 (some scabbed together junk)
and the 16 pound exhaust I built for it using the Magnaflow bits that year



This is a quick pic of the new HP-2 installed, still with a turndown (adding a real tailpipe will knock down more noise)

This year with the header added its been pushing the sound limits at autocross events. McCall has registered/inspected the E30 and is driving it on the street a bit and the exhaust noise level is a bit much. After seeing the results from the Hushpower on my E36 M3 he bought the HP-2. Last week he came by and we did the "before" sound tests with the old Magnaflow 2.25" muffler set-up and the results weren't too surprising. Click the links below to see the videos.

Test equipment:
  • Sound Meter was a Radio Shack 330-2055, "A weighting" set, 30 second sample test, max number posted, 10 feet from the car (which is very close)
  • Video camera is an Aiptek 720P



Sound Test 1: 1st-3rd gears, WOT = 102 dB



Sound Test 2: Cruising at 40 mph = 95 dB




This past Saturday he had the HP-2 409S Hushpower installed in place of the Magnaflow and we did the "after" sound tests. The difference at steady state cruising at 40 mph was a staggering 13 dB drop! (95 to 82 dB) and also a 3 dB drop at Wide Open Throttle (102 to 99 dB).


Sound Test 3: 1st-3rd gears, WOT = 99 dB



Sound Test 4: Cruising at 40 mph = 82 dB


We ran the steady state test twice to re-verify and that 82 dB number is accurate. That's a huge noise drop and very obvious from riding in/driving the car with both mufflers. Driving the car on the street is now a livable experience. You can hear the radio, talk to the other occupant with the windows up, etc. The sound is less "raspy" and it should work wonders at SCCA events, where they test sound at 50-75' instead of the super close range 10' test meter placement we are doing on our "test road".

Cheers,
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  #172  
Unread 11-09-2010, 11:38 PM
dakkon dakkon is offline
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Default Re: Vorshlag 1991 BMW 318is

how much does the final exhaust weigh, i want to build the same exhaust for my 318is that you guys have on this car now.....

also what size of pipe did you use 2-2.5"?
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  #173  
Unread 11-11-2010, 05:52 PM
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Default Re: Vorshlag 1991 BMW 318is

Quote:
Originally Posted by dakkon View Post
how much does the final exhaust weigh, i want to build the same exhaust for my 318is that you guys have on this car now.....

also what size of pipe did you use 2-2.5"?
Used lightweight 18 gauge (non stainless) 2.25" OD pipe and mandrel bends from SPD Exhaust. It weighed... hell, look 2 posts up!







The raw materials weighed 14.2 lbs for the pieces shown above. Add to that the factory Y-pipe we re-used and you get 16.2 lbs, then add the factory header. McCall went back later and added an eBay header (lighter) and a 2nd Hushpower muffler.

http://vorshlag.smugmug.com/Projects...49402819_fwzVm = 4 sound tests on this car
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  #174  
Unread 03-05-2013, 12:21 PM
Fair!'s Avatar
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Default Re: Vorshlag 1991 BMW 318is

This 1991 BMW E30 318is is once again for sale: http://www.sccaforums.com/forums/for...38/scope/posts



We sold it locally, then it ended up in the hands of my friend Jason McCall for a few years, and he painted the car and fixed a lot of little things on the car. Then he sold it to a gentleman that works at The TireRack, who now has it up for sale at the link above for $5500. The car is well sorted, has some very nice suspension components, and is worth every penny. Located in Fort Bend, Indiana, and that is all I know about the price, seller and location. You can find out a lot about the car in this build thread as well as his ad.

Cheers,
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  #175  
Unread 08-06-2013, 11:51 AM
BrianLeib BrianLeib is offline
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Default Re: Vorshlag 1991 BMW 318is

Well, the ol' 318 is alive and living in Austin. I've had it out to Harris Hill a couple times now and it's a blast.

Sadly, it looks like we lost a head gasket last weekend. The car is currently at Terry Sayther's place right now. Spare a thought that its not terminal.

Brian
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