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05-06-2012, 08:51 PM | #45 | |
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though if you look at number 12 with a custom mid pipe.. has the same high end power and the best torque to match, so it really looks like there's something actually quite wrong with the borla midpipe as every single one of those graph entries lowers the torque... i'm guessing it steps down in diameter, or has dodgy bends?.. so yeah i's hazard a guess that it's actually poor design rather than being 'too free flowing' or anything like that :/ would like to know more about it though as that's really super dodgy lol. as i said, we'll see how the headers stack up against each other... MMW's have been in testing and development since about october (or even before likely), so you can't say they haven't done their work at least lol |
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05-07-2012, 12:21 PM | #46 |
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Amusingly I ran #12 on my car for a bit. It had low end and top end but the middle range was dead.
(this document was from the development process of the Borla V2 mid, and the "custom" pipe listed up there in #12 became the borla V2) The race mids for the 46 M3 do prove they can be "too free flowing", though. They get you to ~320-330 whp, but completely destroy the bottom/middle end. Said first hand, as I have it on my race car.
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05-07-2012, 07:55 PM | #47 |
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Hmm sounds like there must be other issues? If theres correct afr and enough compression and timing and appropriate cam durations as such with little exhaust gas to ruin the stoich, there should be appropriate power, mathematically :/ :/ :\ :\
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05-08-2012, 06:23 AM | #48 |
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It sucks that N52 isn't getting the love it deserves.
I am considering emailing Insight Racing for their 128i in the CTSCC series to ask the about what the heck they are doing for power
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05-08-2012, 07:57 AM | #49 | |
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Nor is this unique to my car in any way. 99% of the race prepped M3s are running such a pipe, and all compromise the bottom end. It's just not as simple as freer flowing = better.
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05-08-2012, 08:02 AM | #50 | ||
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i assume they've just done basic stuff (I-T-E) and the full range of handling mods... though i'd like to know if/where they got their tune done since there's nowhere to get a decent one oever here Quote:
i have heard of that happening with most cars though, as the exhaust travels in pulses, a properly sized and.. well everything, exhaust, will create a slight vacuum in the cylinder chamber allowing that fraction more air to flow in... however the inverse is possible where it pushes some gas back in and hinders everything i mean, if you have (just for a ridiculous example) 2" pipes out of each exhaust port with minimal bends (say two, one out of the block one to get to the outside of the car) straight all the way back, you'll find increased gains accross the board no doubt Last edited by flinchy; 05-09-2012 at 04:12 AM.. |
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