ElmerRacing's video: Rex: Ultimate 45mm RallyCross engine Full performance analysis

The FIA mandated 45mm intake air restrictor heavily influences optimum engine design for RallyCross SuperCar engines! This of course applies almost equally to other racing series utilizing inlet restricted turbo engines. Lets take a look at how we designed our Rex engine to fully maximize engine performance, powerband width, and throttle response! (*All numbers based on as-tested (cool) ambient conditions) Calculation accuracy, assumptions and explanations are all here for your viewing pleasure, comments and questions! availability: https://shop.elmerracing.com/racing-engines/61-rex-long-block.html 00:00 Calculated power, VE, and pressure ratio plots 02:15 Intro 04:48 Engine Basics 05:37 Intake Air Mass Flow 10:36 Volumetric Efficiency 14:39 Exhaust Heat Losses 16:16 Compression Ratio 16:46 Combustion Efficiency 17:48 Trapped Charge Purity 21:21 Optimum Combustion Timing 23:03 Knock Amount 26:18 Knock Tolerance 28:28 Pre-ignition 29:25 Optimum Ignition Advance 37:35 Friction Losses 43:02 Cooling Heat Losses 44:10 Pumping Losses 47:26 ElmerRacing billet "boost valve" benefit 50:29 Anti-lag vs. no Anti-lag 53:42 Anti-lag info 55:56 "anti-lag for dummies" -video link: https://youtu.be/x8MPuMAuaLk 57:23 Takeaways