Why is there a difference between USA and JDM engine power outputs?
From: Pasene R. Faifua (mail@removed.com) “Due to different pollution standards, different fuel RON octane contents around the world, and how pretty much all the Japanese Automobile makers use their JDM for ‘banzai specials’. It is unlikely that you can simply retune your car to JDM levels if it’s built to a particular Export Specification/ES. Myself, WongKN, Alan Tang, and Kaz Mori have discussed previously trying to detail what differences are there to ES compared to JDM specifications, and no clear answer came from it. E-EG and E-EK ES Civic VTi has 160ps @ 7600rpm, JDM Civic SiR has 170ps @ 7800rpm. Interestingly the Compression Ratio for JDM is 10.4:1, apparently it’s the same for ES, but the USA version has CR 10.2:1 I’ve personally had a JDM 1990 E-EF9 Civic SiR Dynoed that I was looking at buying to check its performance, and the car came up short showing only 153ps, not the JDM specification 160ps. My Dyno Shop only has the ES for same engined Civic 1.6i-VT which has 150ps, an
From: Pasene R. Faifua (mail@removed.com) “Due to different pollution standards, different fuel RON octane contents around the world, and how pretty much all the Japanese Automobile makers use their JDM for ‘banzai specials’. It is unlikely that you can simply retune your car to JDM levels if it’s built to a particular Export Specification/ES. Myself, WongKN, Alan Tang, and Kaz Mori have discussed previously trying to detail what differences are there to ES compared to JDM specifications, and no clear answer came from it. E-EG and E-EK ES Civic VTi has 160ps @ 7600rpm, JDM Civic SiR has 170ps @ 7800rpm. Interestingly the Compression Ratio for JDM is 10.4:1, apparently it’s the same for ES, but the USA version has CR 10.2:1 I’ve personally had a JDM 1990 E-EF9 Civic SiR Dynoed that I was looking at buying to check its performance, and the car came up short showing only 153ps, not the JDM specification 160ps. My Dyno Shop only has the ES for same engined Civic 1.6i-VT which has 150ps, an
