awd vs. fwd RPMs

[mikey00]

Has anyone compared the RPMs at say 60MPH between a FWD and AWD? The AWD is geared at 4.24 while the FWD is geared at 2.96. This tells me the AWD engine must be reving much higher than the FWD at the same MPH. I am sure this really hurts fuel ecommy and may the reason they reduced the HP to 123. It also causes a lot more engine wear.

[joatmon]

from http://forums.genvibe.com/zero...44450 Quote, originally posted by NovaResource »Auto (FWD):1st : 4.012nd : 2.213rd : 1.434th : 0.98Reverse : 3.27Final Drive Ratio: 2.96Auto (AWD)1st : 2.852nd : 1.553rd : 1.004th : 0.70Reverse : 2.34Final Drive Ratio: 4.24 the FWD has 4th gear ratio of 0.98, final drive of 2.96 which gives a combined effective gear ratio of 0.98 * 2.96 = 2.90 the AWD has 4th gear ratio of 0.70, final drive of 4.24, which gives a combined ratio 0.7 * 4.24 = 2.97The AWD will have higher RPMs than a FWD at the same speed, but not that much different (2.97/2.9 = 1.024, so ~ 2%) at least I think that's how the math goesSome people here have said that the AWD's lower HP number is a result of the extra contortions in the AWD exhaust needed to get it past the rear driveshaft and differential.

[drunkenmaxx]

Quote, originally posted by joatmon »Some people here have said that the AWD's lower HP number is a result of the extra contortions in the AWD exhaust needed to get it past the rear driveshaft and differential.tis a fact!! most of it is from the header (has kinks in it)