{"id":3755,"date":"2014-09-04T18:23:01","date_gmt":"2014-09-05T01:23:01","guid":{"rendered":"http:\/\/www.corbinstreehouse.com\/blog\/2014\/09\/final-drive-ratio-in-an-electric-conversion-car\/"},"modified":"2018-11-03T13:36:23","modified_gmt":"2018-11-03T20:36:23","slug":"final-drive-ratio-in-an-electric-conversion-car","status":"publish","type":"post","link":"https:\/\/www.corbinstreehouse.com\/blog\/2014\/09\/final-drive-ratio-in-an-electric-conversion-car\/","title":{"rendered":"Final drive ratio in an electric conversion car"},"content":{"rendered":"<p id=\"top\" \/>\n<p>So, I&#8217;m getting a new transmission for my VW bug (number 3), and probably buying it from <a href=\"http:\/\/www.mofoco.com\/category\/Rebuilt_VW_Transmissions\/c112\">http:\/\/www.mofoco.com\/category\/Rebuilt_VW_Transmissions\/c112<\/a>. What drive ratio should I get? They can do a few different options.<\/p>\n<p>My bug is\/was currently running the stock stuff for a 69 bug:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.corbinstreehouse.com\/blog\/wp-content\/uploads\/2014\/09\/Screen-Shot-2014-09-04-at-6.10.30-PM.png\" width=\"619\" height=\"114\" alt=\"Screen Shot 2014-09-04 at 6.10.30 PM.png\" \/><\/p>\n<p>I have 165R15 coker tires, and the diameter was calculated via:<\/p>\n<p style=\"margin: 0px; color: #021EAA;\"><span style=\"text-decoration: underline ; letter-spacing: 0.0px\"><a href=\"http:\/\/www.evsource.com\/motor_calculator.php\">http:\/\/www.evsource.com\/motor_calculator.php<\/a><\/span> <span style=\"letter-spacing: 0.0px; color: #000000\">&amp;<\/span><\/p>\n<p style=\"margin: 0px; color: #021EAA;\"><span style=\"text-decoration: underline ; letter-spacing: 0.0px\"><a href=\"http:\/\/store.cokertire.com\/tire-styles\/radial-tires\/wide-whitewall\/165r15-bfg-2-1-4-whitewall.html\">http:\/\/store.cokertire.com\/tire-styles\/radial-tires\/wide-whitewall\/165r15-bfg-2-1-4-whitewall.html<\/a><\/span><\/p>\n<p>The ratios I got from the VW manual, and the screen shot is from my Numbers spreadsheet (email me and I&#8217;ll send it to you).<\/p>\n<p>Here are my current speeds for a given RPM and a given gear. Max motor RPM is around 5000 (maybe 5500, but that is pushing it), so I have to shift before then. I don&#8217;t use first; it is pointless (I have enough torque to not need it), too jerky, and would have to quickly shift.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.corbinstreehouse.com\/blog\/wp-content\/uploads\/2014\/09\/Screen-Shot-2014-09-04-at-6.12.07-PM.png\" width=\"309\" height=\"335\" alt=\"Screen Shot 2014-09-04 at 6.12.07 PM.png\" \/><\/p>\n<p>I always start in 2nd, shift into 3rd at about 40mph, and 4th at 65mph; this keeps me under the 5,000 RPM limit. I have a top speed of a bit under 100mph, based on the RPM.<\/p>\n<p>So, the diff ratio is 4.375 (also called 4.38); also known as the &#8220;ring and pinion&#8221; gear ratio. What if I get a freeway flyer 3.88 ring and pinion? Dropping that into my spread sheet gives<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"http:\/\/www.corbinstreehouse.com\/blog\/wp-content\/uploads\/2014\/09\/Screen-Shot-2014-09-04-at-6.19.11-PM.png\" width=\"332\" height=\"352\" alt=\"Screen Shot 2014-09-04 at 6.19.11 PM.png\" \/><\/p>\n<p>So, if I did this, I would: start in 2nd, shift to 3rd at about 45 mph, and shift into 4th at about 75 mph. I rarely go 75 mph; the car starts to shake a bit at high speeds, and it just isn&#8217;t designed to do that. The lower ratio would probably make the car less torquey, so I&#8217;ll stick with the standard ratio.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>So, I&#8217;m getting a new transmission for my VW bug (number 3), and probably buying it from http:\/\/www.mofoco.com\/category\/Rebuilt_VW_Transmissions\/c112. What drive ratio should I get? They can do a few different options. My bug is\/was currently&#8230; <a class=\"read-more\" href=\"https:\/\/www.corbinstreehouse.com\/blog\/2014\/09\/final-drive-ratio-in-an-electric-conversion-car\/\">[read more]<\/a><\/p>\n","protected":false},"author":1,"featured_media":3750,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_post_was_ever_published":false},"categories":[34],"tags":[],"class_list":["post-3755","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electric-bug"],"jetpack_featured_media_url":"https:\/\/www.corbinstreehouse.com\/blog\/wp-content\/uploads\/2014\/09\/Screen-Shot-2014-09-04-at-6.10.30-PM.png","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/posts\/3755","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/comments?post=3755"}],"version-history":[{"count":1,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/posts\/3755\/revisions"}],"predecessor-version":[{"id":5369,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/posts\/3755\/revisions\/5369"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/media\/3750"}],"wp:attachment":[{"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/media?parent=3755"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/categories?post=3755"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.corbinstreehouse.com\/blog\/wp-json\/wp\/v2\/tags?post=3755"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}