{"id":17564,"date":"2015-08-28T20:26:18","date_gmt":"2015-08-29T01:26:18","guid":{"rendered":"http:\/\/caddyinfo.com\/wordpress\/?p=17564"},"modified":"2015-08-28T20:44:26","modified_gmt":"2015-08-29T01:44:26","slug":"initial-tuning-steps-cadillac-lh2-v8-engine","status":"publish","type":"post","link":"http:\/\/www.caddyinfo.com\/wordpress\/initial-tuning-steps-cadillac-lh2-v8-engine\/","title":{"rendered":"Initial Tuning Steps Cadillac LH2 V8 Engine"},"content":{"rendered":"

First, I wanted to adjust the tune to recognize that we have E10, or gas with up to 10% ethanol.\u00a0 This gas has a lower stoichemic makeup, and an ideal ratio is 14.2:1 air:fuel instead of non-alcoholic gas at 14.7:1 air:fuel.\u00a0 The Cadillac factory tune assumes 14.7:1 fuel.\u00a0 I set the tune to 14.4:1 since we have an uncertain mix of alcohol in the fuel.<\/p>\n

Second & Third, in our Texas heat the Cadillac is just on the border of heat retard from engine coolant temperature and intake air temp.\u00a0 I addressed each of those to move the ‘border” a few degrees higher and get that retard out.\u00a0 We’ll look for any sense of knock or knock retard on these runs just to be careful.<\/p>\n

\"XLR<\/a><\/p>\n

The two test runs with those changes appear to have lost 8 hp and 5 lb ft of torque.\u00a0 Not what I hoped.\u00a0 In this graph the red\/blue runs are from earlier today, the green\/yellow runs are from after the tuning changes.<\/p>\n

The stoichemic setting change had the effect of moving the XLR 0.3 richer on in AFR, which is not what it appears to want.\u00a0 The other changes allow it run a bit more timing.\u00a0 My sense is we need to keep the AFR, but I am uncertain if the Wideband O2 sensors in the XLR are auto-magically compensating for fuel quality and driving to lambda for the current fuel, then reporting that as 14.7 AFR?<\/p>\n

\"XLR<\/a><\/p>\n

The calculated hp before\/after is not as dramatic as the Virtual Dyno.<\/p>\n

For the next tune I plan to replace Stoich at 14.7, and move PE from 1.176 to 1.148 (12.8:1).\u00a0 This will have the net effect of going the other way from baseline — taking the overall fueling 0.3 AFR leaner than factory tune from 12.5:1 to 12.8:1 in AFR terms.<\/p>\n","protected":false},"excerpt":{"rendered":"

First, I wanted to adjust the tune to recognize that we have E10, or gas with up to 10% ethanol.\u00a0 This gas has a lower stoichemic makeup, and an ideal ratio is 14.2:1 air:fuel instead of non-alcoholic gas at 14.7:1 … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[779,564,324,189,845,299,300],"tags":[],"class_list":["post-17564","post","type-post","status-publish","format-standard","hentry","category-hp-tuners","category-test-drive","category-test-gear","category-test-info","category-virtual-dyno","category-xlr-cadillac-models","category-xlr-cadillac-models-2"],"_links":{"self":[{"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/posts\/17564","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/comments?post=17564"}],"version-history":[{"count":3,"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/posts\/17564\/revisions"}],"predecessor-version":[{"id":17569,"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/posts\/17564\/revisions\/17569"}],"wp:attachment":[{"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/media?parent=17564"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/categories?post=17564"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.caddyinfo.com\/wordpress\/wp-json\/wp\/v2\/tags?post=17564"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}