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      07-24-2009, 04:01 AM   #155
Andrew 912
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Short exit tips facing to the rear would not only be good for the looks but also very important to prevent the water splash from rear tires and underneath the car especially on the puddles.
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      07-24-2009, 08:50 AM   #156
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Short exit tips facing to the rear would not only be good for the looks but also very important to prevent the water splash from rear tires and underneath the car especially on the puddles.
I had been wondering why you were not concerned about exhaust coming out under the car and seeping in. Is it just that you will only have them open in motion? No risk of leaks while idle? Does exhaust not actually pass through the valve? (can't imagine why not)
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      07-24-2009, 09:43 AM   #157
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Directly above the valve is heat shielding, and it is pretty far to the rear. I figured that if people use cutouts directly under the middle of the car, I should be fine where it is. Water isn't something I thought too much about.. the valves are angles backwards, so whatever little water might get in there would just evaporate or get blown out. Remember that the pipes take a pretty steep angle upwards inside the exhaust too, so I think water would have a hard time getting up there. I also wanted to keep it as high off the ground as possible (for backing into parking spot curbs for example).

I think we may put little tips on there at some point. For now I think it looks great with the valves exposed. I actually like the look; reminds me of the transformers or something. I'll try and get better pics later. The only thing that bugs me a little is the exhaust goo dripping down the bottom of the valve, so that might prompt me to put a little tip there so it stays a little cleaner.

I wish you guys could hear this in person..
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Custom Exhaust Project: Bates Valvetronic exhaust: http://www.m3post.com/forums/showthread.php?t=253661 -- Exhaust Mod pics in here: http://www.flickr.com/photos/40236795@N03/
DON'T BUY Race Ready Performance electronic cutout valves. Here's why: http://www.m3post.com/forums/showthr...40#post9589740

Last edited by Subw00er; 07-24-2009 at 11:11 PM.
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      07-24-2009, 02:52 PM   #158
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Wow. Sounds great!! I can't wait to hear some more videos. My cutouts are supposed to be delivered today. I can't wait to have them installed.
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      07-24-2009, 08:22 PM   #159
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Awesome.
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      07-24-2009, 08:27 PM   #160
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Went out to take video today.. get all set up. Forgot the camera battery! GRR
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Custom Exhaust Project: Bates Valvetronic exhaust: http://www.m3post.com/forums/showthread.php?t=253661 -- Exhaust Mod pics in here: http://www.flickr.com/photos/40236795@N03/
DON'T BUY Race Ready Performance electronic cutout valves. Here's why: http://www.m3post.com/forums/showthr...40#post9589740
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      07-24-2009, 08:48 PM   #161
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Grrrrrr!!!!!!! Let's hear the real sound!!!!!!
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      07-25-2009, 12:29 AM   #162
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Videos?
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      07-25-2009, 12:37 PM   #163
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Quote:
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... there is a nice slight burble/throatiness to the sound when just cruising ...
You miss that Z06, don't you?

I can't wait to hear it!

-J

Last edited by jishaq; 07-25-2009 at 07:01 PM. Reason: Omit unnecessary details
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      07-25-2009, 07:21 PM   #164
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I'm editing the videos now. In the meantime, here are the final installed pics. Stay tuned!

My deepest apologies to all the garage queens out there. My car is filthy!











These are the pics that make me think it looks a bit like a Transformer. I suppose the fact that there are moving parts back there doesn't hurt.




Videos are building now.. They'll be up tonight.
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Custom Exhaust Project: Bates Valvetronic exhaust: http://www.m3post.com/forums/showthread.php?t=253661 -- Exhaust Mod pics in here: http://www.flickr.com/photos/40236795@N03/
DON'T BUY Race Ready Performance electronic cutout valves. Here's why: http://www.m3post.com/forums/showthr...40#post9589740

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      07-25-2009, 08:54 PM   #165
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      07-25-2009, 11:38 PM   #166
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Videos are building now.. They'll be up tonight.

my night is over on the east coast damn guess ill check again in the am
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      07-26-2009, 12:15 AM   #167
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The videos will be up tomorrow. 1.5gigs is taking forever to upload to YouTube!
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Custom Exhaust Project: Bates Valvetronic exhaust: http://www.m3post.com/forums/showthread.php?t=253661 -- Exhaust Mod pics in here: http://www.flickr.com/photos/40236795@N03/
DON'T BUY Race Ready Performance electronic cutout valves. Here's why: http://www.m3post.com/forums/showthr...40#post9589740

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      07-26-2009, 09:50 AM   #168
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Congrats on the final product sounds great!!!!
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      07-26-2009, 10:35 AM   #169
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Attn: Vendors

Congratulations on putting together one of the most comprehensive, detail oriented build and tests I have ever seen. I have been hanging on every post waiting for the conclusion. I hope as it evolves we will see some dyno numbers for reference.

The DB meter is a nice touch- I don't know why we don't see more of these kind of videos.

Exhaust vendors take note- This is how you introduce a new product. While I appreciate the artsy-fartsy pictures we get, I think that most of us would agree that quality videos comparing your product to stock and quantifiable data like DB ratings vs. stock are much more compelling.

I loved this build!!
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      07-26-2009, 10:42 AM   #170
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The videos are all in HD 1080P with 256KB audio (although I'm not sure what happens to them once hitting YouTube). I am still not totally happy with the rendition. The videos all sound sort of flat, and I still have a lot of trouble capturing the right sound for the interior shots. The exterior is much closer top real than the the interior shots. Oh well.. Maybe I'll try my other mic one day if I get bored.

Here is HD video one of three: Blipping and steady throttle whilst stationary & SPL meter. TURN UP THE SOUND!
http://www.youtube.com/v/NamH3a5ko50&hl=en&fs=1&

Here is the second of three HD videos! TURN UP THE SOUND! FlyBys:
http://www.youtube-nocookie.com/v/FF...l=en&fs=1&hd=1

Here is the last video for now of in-car cruising footage. This is the video I'm not super happy about. Its just not accurate to real life. I tried a few things with the mic placement and settings but it just doesn't pick up the essence of the exhaust. The interesting thing about this Bates Exhaust is how different it sounds inside the car vs outside. Inside the car it sounds very European, reserved, controlled, and like nothing I've heard. My friend commented it sounded a bit like a Carrera GT in the way that it sounds different. I drove around for a few days thinking that this is what everyone else was hearing. Its not till I heard it on the drive-bys that I realized the massive difference. Occasionally I would get a hint of something else brewing back there if I drove closely by a building. Outside the car, it sounds a lot like a raspy, fire-breathing and "get the hell out of my way" loud V8 muscle race car. It reminds me a little of my C5z06 (which is a good thing!).
http://www.youtube-nocookie.com/v/Fw...l=en&fs=1&hd=1

Its pretty scary to invest so much time and money into a project without knowing what it will be like in the end. This time, my expectations were far exceeded. I'm super happy with how it turned out:
  • It doesn't drone open or close, so the Helmholtz chamber is still working
  • There is no change from stock sound when the valves are closed
  • When the valves are open it creates a monster; loud, refined with a very unique and interesting sound. Blipping and heel-toe has become intoxicating
  • Exhaust noise level is now matchable to the intake noise. I love intake noise, but it always sort of bugged me that the intake was so much louder than the exhaust.
  • Stock appearance is pretty close - most laymen wouldn't know they aren't looking at a normal M3 exhaust

As far as power goes, I am not sure yet. A dyno will cost me $150 and I want to get some miles on the car before going, maybe next week. Butt dyno tells me that it feels about the same, and this could be placebo, but maybe its slightly faster with the valves open. Anyway, I wasn't going for HP increases with this project, but it certainly doesn't feel like I've lost power, i.e. under 3KRPMs. I think I've retained enough back pressure so that doesn't happen. BTW, it seems to rev up a lot freer (sp?!) with the valves open.

I'd like to give a big thanks to Sam for all of his hard work, time, engineering, and of course, his art (remember: Samuelegallery.com.)

Let me know if you guys have any questions/requests. Thanks for watching and the kind comments so far. This has been a really fun thread to maintain.

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      07-26-2009, 12:40 PM   #171
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You blew the ultra-expensive Kriesseg (or whatever it spells ) exhaust out of the water man; it sounds like crap with the valves closed, and yours sounds better with them open IMO. Plus your valve integration is the best possible one. Congratulations . Now you have a truly unique exhaust... and the best 'valve-tronic' one .

I have to say the system sounds incredible with the valves closed; didn't know a stock M3 sounds that nice, or does your car sound different than stock??? Wish you had done one flyby with the valves closed. You should also have put 'Bates Exhaust' on your plate, no?

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      07-26-2009, 12:49 PM   #172
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It would be cool to do some sort of vacuum actuated system like the C6 Corvette has, where the calves open more at higher RPM's when more vacuum is introduced.

I think you did an amazing job, and I applaud you hard work and dedication to this project. If you were to do this work for people @ $2k a pop if they provide their exhaust, I am sure people will be jumping on it. It really does put the few other valved exhaust to shame!

-Andy
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      07-26-2009, 12:53 PM   #173
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You blew the ultra-expensive Kriesseg (or whatever it spells ) exhaust out of the water man
+100 This sounds so much better. I don't even like the sound of the Kriesseg. This sounds great though. Plus it's so much cooler the way you custom built it out of the OEM muffler. By far one of the best projects posted on this forum. I would love to check this car out in real life sometime.
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      07-26-2009, 01:17 PM   #174
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It would be cool to do some sort of vacuum actuated system like the C6 Corvette has, where the calves open more at higher RPM's when more vacuum is introduced.
Actually the ECU sends the signal to open them at 3,500 rpm. Yes, the valves are vacuum-operated, but when the actuator gets the signal from the ECU. Many owners wire the valves directly so they can open them at will (like this system), but it'd be nice to have both options indeed. Take care.
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      07-26-2009, 01:34 PM   #175
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Thanks for all the documentation. We're all glad it was actually fun to document. Sounds good but indeed recordings of exhausts never really do them justice. I'm a bit confused about how you qualitatively compare the sounds to both a Vette and to a CGT/European exotic. IMO these characteristics couldn't be more different.

I think the valves turned out to be way to visible/visibly obtrusive in this design. It sounds good for you though as you like the look. This is one area where the other bypass project posted here in the forum has yours beat - looks. Of course that is all completely subjective.

Congrats!
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      07-26-2009, 01:44 PM   #176
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I think the valves turned out to be way to visible/visibly obtrusive in this design.
That's an excellent (and valid) point, and he was fully aware of it. I wouldn't do it if a diffuser (or something else) can't hide them, but the other reality is I haven't seen a perfect system yet, so you always have to compromise with something. By the way, adding tips would only make them more of an eyesore IMO.

Yes, it's one thing to do it yourself for a few hundred bucks (plus your time), but entirely another having to pay over 2 grand for it; that definitely brings higher expectations. For what he paid, it was an absolute success IMO. Selling it to make a profit might prove daunting; we'll see, I guess. Take care.
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