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01-08-2013, 01:24 AM | #111 | ||
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W Cole and ANYONE ELSE: Feel free to download, edit, save (automatically saved) and post a screen snapshot of the update.
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01-08-2013, 02:08 AM | #112 | |
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So with a pulley the a/c gets underdrive when cruising and at wot it does not matter as its not engaged. Then when off the pedal the altnerator you really do not want to get underdrive as that is when its charging. Not saying there is not power to be had but it is from underdriving 2 things only-power steering and engine coolant-just not the 2 things I really want to have underdrive personally, especially living in high heat of the desert. My point is cars awhile back gained much more from a pulley as parasitic losses were much more significant when you had the a/c engaged during WOT, alternator running at all times and heavier components. If the m3 didn't have the water pump and went electric, it essentially would only be driving the power steering which we all know is going electric. We are not far off from having maybe 1 or 2 things drive by a belt, or perhaps nothing at all in a few years with things going electric. This is how the m3 should have gone about increasing performance and mileage in the f30. Take the s65, direct inject it and up the CR to boot. Upgrade to latest vanos tech and then worked on getting rid of the lat parasitic losses with an electric water pump, electric steering etc. Could have been an easy 450 hp reworked, way more efficient, and with a lighter body would have been a perfect car |
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01-08-2013, 05:11 PM | #114 | |
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01-08-2013, 08:42 PM | #115 | |
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Link 1. Here is another link. One more with almost direct evidence. Here is a source also claiming no BER in the US. In short, after reviewing all of the posts here and on other sites I would say that all NA model years of the M3 having BOTH features (AC and Alternator disengaging at high or WOT) is very debatable. It would be great to put this one to bed.
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01-08-2013, 09:06 PM | #116 | |
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At the M-school, the instructors were very clear that it would be ok running A/C on the M3s (not allowed to run w/ windows down), as > 80% of WOT results in AC disengaging, which they asserted really wouldn't affect lap times in the competitive timing.
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01-08-2013, 11:20 PM | #117 |
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02-10-2013, 08:03 PM | #118 | |
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Either way... BUMP for more pulley measurements. Sure would be nice to make an informed and OBJECTIVE purchase on a pulley.
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02-21-2013, 09:58 PM | #119 |
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I received my Dinan pulley today.
To my surprise, the tracks on the pulley for the two belts are of significantly different diameters. The track for the power steering and A/C belt is smaller the the one for the alternator and water pump belt. I have the "early" kit with the single sided belt, I don't know if it has anything to do with it. The first chance I have, I will bring it to work to get it measured. I will post back the results. |
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02-22-2013, 02:49 AM | #120 |
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^ Great, finally a bit more data. Get the stock and Dinan diameters both if you can. Thanks in advance.
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02-22-2013, 09:32 PM | #121 | |
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02-23-2013, 05:19 AM | #122 | |
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Since you have the later pulley, do the two tracks have different diameters on your pulley? I curious to find out if it is a Dinan pulley characteristic only if it only applies to the earlier belt arrangement... |
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02-23-2013, 10:02 AM | #123 | |
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Here is a link to a sort of DIY (with respect to the short belt) I posted after my install.http://www.m3post.com/forums/showthread.php?t=771364 |
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02-24-2013, 03:46 PM | #124 |
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I love my Dinan. Warranty is a non-issue, install was cheap at a non-BMW location, proven gains...no downside!
And to answer the next question, no problems with AC, engine cooling, hard steering feel, etc, even at a track...albeit in SoCal.
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03-03-2013, 01:58 PM | #125 |
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Awaiting your results! Thanks!
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03-03-2013, 02:06 PM | #126 |
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03-03-2013, 07:52 PM | #127 |
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Cool, safe travels!
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03-04-2013, 10:25 AM | #128 |
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Here we go, Dinan pulley for early (one-sided) belt configuration:
Water pump and Alternator track: 3.986" (101.2mm) Power steering and A/C track : 3.833" (97.4mm) I will post the OEM pulley dimensions as soon as I have the pulleys swapped . |
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03-04-2013, 09:08 PM | #131 |
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