[Bill Wells]

isn't the typical parasitic loss as they call it for such things as drive line, exhausts, air cleaners etc for a manual trans car more often used at a 15, 17 or 18% ratio vs 20? ie, to convert from rear wheel hp rating to an ESTimated flywheel hp, divide the rwp number by the reciprocal of the estimated loss % : ex: 410 rwhp at 15% loss equates to est flywheel hp of 482 ( 410 divided by .85)...410 rwhp at 17% loss equals 494 engine hp and at 18% equals 500 engine hp. if a 5 spd the chassis dyno pull should have been in 4th gear for 1:1 ratio. some variabilities exist between chassis dynos but think a 20% loss figure is too high to use even with a less accurate chassis dyno brand. many engines seem to engine stand dyno at numbers much higher than an est calculation from a chassis dyno of the same engine in a car vs engine stand. however, i suspect the enigine dyno numbers are under more ideal heat/humidity/ density conditions than the real world of being IN the car and in many cases the parasitic loss is much greater ? bill