EcoModder Forum 5th gear swap? 2000 focus zx3

Register Now
 Remember

 01-11-2013, 10:50 AM #1 (permalink) EcoModding Lurker   Join Date: May 2012 Location: Minnesota Posts: 31 Thanks: 3 Thanked 0 Times in 0 Posts 5th gear swap? 2000 focus zx3 I was looking at purchasing a focus zx3 with a bad transmission. I was thinking it would be a cheap ecomod car but the mpg isn't the greatest and the 5th gear far from perfect. Does anyone know of a transmission or gear swap to get a lower rpm in the car?
 Today Popular topics Other popular topics in this forum... View the most popular topics in this subforum by views or by posts
 01-11-2013, 11:28 AM #2 (permalink) Master EcoModder     Join Date: Dec 2012 Location: ff Posts: 459 Thanks: 59 Thanked 36 Times in 29 Posts My gear change was done with the tire circumference. there is a calculator to figure rotations per mile I will copy from other thread should help. As for sprag and gear changes seek a trans shop that build/s racing trans for these cars. I worked at Ford when they first came out and there was a solid following of tuner crowd working these cars. 215/17/45 tire Originally Posted by vrmilionzx I converted to mm (so everything is in the same form of measurement), and used 25.4 mm in one inch, so: Old Wheel Dia = 17x25.4 = 431.8mm Old Tire height = 215mm x .45 (aspect ratio) = 96.75mm Old combo total Dia = 431.8+(2*96.75) = 625.3mm 185/15/65 New Wheel Dia = 15x25.4 = 381mm New Tire height = 185mm x .65 (aspect ratio) = 120.25mm New combo total Dia = 381+ (2 x 120.25) = 621.5mm divide a mile by your outcome for the rot per mile. stepping up either tire height {215 to 225/235} or aspect increased .67 to a .70 or .75 increases circumference without changing wheels. Last edited by justme1969; 01-11-2013 at 11:41 AM..