been tuning my new motor with E85 and 14.5 to 1 comp and it made 204kws at 9000 rpm diff ratio is 4.3 and 205 x50 x15 rims about 584mm dia
went back last week end same motor but 4.55 ratio and also changed the tyres to 225 x50 x15 or 603mm power is now 176 kws
but also at 100 kays with 4.3 and 205 tyres revs were 4250 rpm in 4th
with 4.55 and 225 tyres revs are 4370 ,so a little more
so most dyno dynamics change as soon as you change little things