02-27-2013, 10:08 AM | #23 | |
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Noelle is a very reputable company and I'd love to see their parts be a success and work out for you. But at the same time please don't make it sound like these are official approved/sanctioned components by BMW. I also think you might just have fallen into the trap by your "contact" in sometimes reading too much into their words/statements (and their premature release of pictures/information not part of the actual product) and being the enthusiastic person you are repeating it to the world. Which in turn might just cause a few eye brows to be raised So having said all of the above we are all looking forward to your journey and hopefully great results.
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02-27-2013, 10:16 AM | #24 | |
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glad to be back on topic I am not near my (stored) OEM exhaust so can't check in person but if the exhaust valve is similar to the one on the F30 the DYI from the F30 should apply http://www.f30post.com/forums/showthread.php?t=761453 As for the vacuum line all you have to do is to unplug it from the valve and plug it with something which seals it nicely (a golf tee does work wonders ) . Then secure the line so it doesn't bounce around or can get loose and the plug fall off . On the E90 (and likely the Eisenman without the valves) the BMW Performance exhaust had actually a little metal piece welded to it where you could plug / terminate your vacuum line. Oh and yes this can all be done while the exhaust is one the car and also without the need for a lift etc (it would just make it easier to work on the car if it's on a lift) Hth, Jan
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02-27-2013, 10:36 AM | #25 | |
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02-27-2013, 01:08 PM | #26 | |
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:-( Never actually got into a heated thing like this before mentioning stuff like this. Usually just a cheerleader for other's cars and projects and try not to criticize anyone's cars or mods. Sorry for the nutcase attitude. Last edited by ColdList; 02-27-2013 at 01:28 PM.. |
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02-27-2013, 01:10 PM | #27 |
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I would probably add a little RTV sealant around the joint between your plug and your line. You can get ti for $5 at any automotive store. IT creates a rubber gasket and eliminates any chance of leaks. Mine really performed terribly because of a leak.
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02-27-2013, 01:20 PM | #28 | |
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Thanks for the response. I appreciate it. P.S. Can you do me a favor and point me to where I commented about not voiding warranty? I definitely CANNOT say that. I thought I had said that I wasn't concerned (I don't keep them long enough for there to usually be much impact either way) and that I did not know if warranty would be voided. Ugh...searching for this stuff and modifying. I need to edit that post if I did in fact say that. Thanks again. Last edited by ColdList; 02-27-2013 at 01:27 PM.. |
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02-27-2013, 01:28 PM | #29 | |
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And we all BS, misstate or exaggerate the truth once in a while. I once did that myself back in '93 but have been 100% honest and accurate ever since. |
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02-27-2013, 01:40 PM | #30 | |
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Thanks. I appreciate that. Yep. Not first time the old "foot in mouth" thing happened. I go a little nuts when it comes to my cars. If my HREs don't get here soon I'm gonna flip!-lol |
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02-27-2013, 03:16 PM | #31 | |
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Happens to the best of us from time to time ... there's nothing quite like the taste of shoe leather!
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03-02-2013, 04:25 PM | #32 |
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I spent some time playing around with the exhaust valves today. First I did a visual inspection - the only thing leading to the actuator that controls the valve is the vacuum line. I had read some comments in this and other threads that the valves open when the cats warm up or Sport+ mode is selected on the throttle control. I do not think either of these is correct since there is no electronic control of the valves - it appears as if the valves can only be opened by sufficient pressure built up in the vacuum line. From moving them by hand I can tell you it's a fairly stiff spring, so a lot of pressure will be necessary - likely once the engine is above something in the 5,000 to 6,000 RPM range. I looked at a schematic of the exhaust on realOEM.com and there is an in-line electronic value farther up the vacuum tube which may control whether or not the exhaust valve is "active" based on certain settings or other conditions, but I do not think it can actually control the valve itself.
Next I started up the car an opened and closed the valves by hand. There is a slight increase / improvement in sound at idle with the valves open, but nothing dramatic. The exhaust seems to have a slightly deeper tone with the valves open. The last thing I did was temporarily lock the valves open using some heavy duty twist ties and went for a short drive. As with my observation at idle, there is a slight increase in the sound level and a slightly deeper tone to the exhaust - it is not dramatically louder driving with the valves locked open. Another important lesson learned - for my experiment I did not touch the vacuum lines and there was no impact to performance. It seems as long as the vacuum lines are still connected to the actuator, back pressure is maintained and there is no loss in power as ColdList experienced when his exhaust installed just left the vacuum lines unplugged. The twist ties I used for this test were not appropriate to leave on permanently, so my next step will be getting the proper materials to lock the valves open on a long-term basis.
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03-02-2013, 04:48 PM | #33 | |
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03-03-2013, 05:00 PM | #36 |
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My local shop used a pop rivet to hold the valves open. It did give the car a bassier idle and a fraction more low rev noise. After a couple of months I got the rivets removed. The exhaust note got on my nerves and there wasn't enough improvement in the overall sound to make it worthwhile.
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03-04-2013, 02:58 AM | #38 | |
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03-04-2013, 07:10 AM | #39 |
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Yes, I was surprised at how much pressure was necessary to open them.
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03-05-2013, 10:33 PM | #40 |
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did this today, golf tees in the vacuum lines with sealant recommended above and then aluminum wire to secure valves open. took about 30 minutes in total and was a little underwhelming, hardly noticeable at all.. my gallardo has a very noticeable change when exhaust valves opened was hoping for something similar.
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