07-13-2018, 05:44 PM | #43 |
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I'mma just gonna leave this here for y'all to consider...
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07-13-2018, 06:14 PM | #44 | |
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Toda is undersized crank pulley, so it underdrives everything. Fensport is oversized alt and water pulley, so it underdrives alt/water |
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07-13-2018, 06:21 PM | #45 | |
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Pretty sure alternator doesn’t have that feature, so not sure how it would stop leaching power. It may not be charging the battery or powering the system under certain engine loads but it would probably still be spinning and “functioning” leaching power. But you may be correct not sure. |
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07-13-2018, 07:29 PM | #46 |
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I got tired of reading this so if this has been addressed sorry, but underdrive pulleys and lightweight pulleys are 2 different things. That's like apples to oranges and can not be compared
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07-13-2018, 07:41 PM | #47 | |
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http://www.toda-racing.co.jp/en/prod...lley-fa20.html I would call them like snake oil and holy water though. Apples and oranges are both useful things. |
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07-13-2018, 09:57 PM | #48 | |
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Found a relevant passage in the 2017 Updates pdf, pg. 89 of 120: Battery Condition Sensor The previous current sensor always maintained control to keep the battery fully charged. The battery condition sensor calculates the charge status, level of deterioration and internal resistance of the battery from data such as its voltage, current and temperature, and controls charging so that there is always spare capacity available. This allows the recharging rate to be increased when decelerating, which improves fuel efficiency. If fuel efficiency is being improved, then resistance of the alternator under load is being reduced. I'm not sure how much, but I think it's safe to say the already small number being thrown about for power consumed by the alternator can be chopped in half or more for the +2017's. I think the E92 M3's alternator disengages completely and that was 2007. |
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07-13-2018, 10:31 PM | #49 |
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@Subsonic, your units for inertial moment are incorrect. Should be in kg*m^2. It's only in notation, though. The numbers converting from imperial to SI are good so it must've been a typo.
I appreciate your statement to the effect of neglecting the contribution from the other rotating masses. I did the same in my calcs which I never finished.
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07-13-2018, 10:56 PM | #50 | |
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I think it was 4hp is what someone calculated for when in use. Making the alt 3.4hp to spin with pulley. I wonder how much of that resistance goes away when not charging. If it’s half then still leaching 2hp / 1.7hp with pulley. Either way it was semi cheap after already getting water pulley and belt. Kind of a why not mod at that point. And besides going FI im pulling at straws to get any small gains at this point. |
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07-13-2018, 11:07 PM | #51 | |
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07-14-2018, 12:44 AM | #52 |
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Nah. People either get it or they don't want to because they're emotionally attached to justifying their purchases. I got far enough to confirm my suspicion but got bored with my little paper. I should finish it.
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07-14-2018, 12:51 AM | #53 |
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So, how many HP?
Sorry, couldn't resist. |
07-14-2018, 01:59 AM | #54 |
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None but that .58% improvement in acceleration makes the car come alive. Ditch that junker Lotus and invest all the cash in anodized aluminum rotating parts and you can probably bring that acceleration increase up to 1% and hit the pro race circuit.
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07-14-2018, 02:14 AM | #55 |
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07-14-2018, 02:24 AM | #56 |
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I remember back-in-the-day, when I was a child, I tried to convince my grandpa that if he let me drill holes in the arms of that drive pully on the steam engine, it would be lighter and spin faster, thus allow the thrashing machine to run faster and we could get done thrashing sooner.
He told me to go back up to the farmhouse and bring back another jug of iced tea - humfrz |
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