Hi Lee and All, I'm using some early Mazda Miata front hubs, brakes that has retraction V shaped springs that with just a couple tiny holes drilled in the pad for the wire spring end to fit, could fit many disc brakes that don't have them stock. Likely able to do it with just removing the tire. On Tire LRR common car tires are bad but MC tires are 2x's worse I found on my Streamliner MC low CG chassis !! I'll have to find better before doing the EV Streamliner, maybe even adapting LRR car tires if I can't find a LRR MC tire. Jerry Dycus From: Lee Hart via EV <[email protected]> To: Michael Ross <[email protected]>; Electric Vehicle Discussion List <[email protected]> Sent: Sunday, November 9, 2014 5:44 PM Subject: Re: [EVDL] Range vs Speed Michael Ross via EV wrote: > If I want to think I am reducing energy consumption, I seek a lower > average speed. Not much else helps to the same extent. Skinny tires, > better regen efficiency, hidden wiper blades, lower overall > height?... meh.
I agree on regen, hidden wipers, and lower height. But tires really do make a big difference. There is at least a 2:1 difference in the rolling resistance of otherwise similar tires. This translates into about a 10-20% difference in range (more at low speeds where tires are a big part of your losses; less at high speeds where wind resistance dominates). The trouble is, it's hard to find data on rolling resistance. Your best bet is usually to get OEM tires from some car that needs to have good gas mileage. (Note that the tires sold in tire stores are NOT the same tires that car manufacturers get!) Tire pressure, wheel alignment, and dragging brakes also make a big difference. Most tires get underinflated for a "cushy ride", or just because no one has checked the pressure in months. Wheel alignment is also likely to be off. And *most* car's brakes drag, with the pads constantly running against the calipers because there aren't really any spring retractors. -- A designer knows he has achieved perfection not when there is nothing left to add, but when there is nothing left to take away. -- Antoine de Saint Exupery -- Lee Hart's EV projects are at http://www.sunrise-ev.com/LeesEVs.htm _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20141110/76c24067/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
