This is topic Calculating Rpm for new gears in forum Tech Talk at Northern California Ford Owners  .


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Posted by 04mustanggtkibby (Member # 4202) on :
 
I got a 04 Mustang gt Automatic 4speed with O/D. I commut to work every night, How ever far Vacaville to cordelia is but the only thing stopping me from getting gears is gas mileage. So does any one know if i went to 4.10 gears what rpm i might be at goin 65 on the freeway. [Confused] O yeah i have stock rimes and tires

[ July 12, 2005, 09:56 AM: Message edited by: 04mustanggtkibby ]
 
Posted by uncle bill (Member # 3953) on :
 
approx 25-2600
 
Posted by bunchmyfunky (Member # 360) on :
 
on the 5spd car its about 600rpm between 3.27s and 4.10 as far as gas milage goes I didn't notice a difference.
 
Posted by 04mustanggtkibby (Member # 4202) on :
 
but on that 5 gear doesnt it drop your dramitcly..i only got 4 and i am already at 2000rpms goin 70 wouldnt it raise my rmps a lot and isnt it better to maintain a low rmp not to waist gas?

[ July 12, 2005, 12:15 PM: Message edited by: 04mustanggtkibby ]
 
Posted by hungry hippo (Member # 537) on :
 
higher rpms doesnt always mean worse gas mileage. mileage is from the load on the engine or how much fuel is being used. bogging the car down will waste more gas than cruising at 4k
 
Posted by 04mustanggtkibby (Member # 4202) on :
 
bogging the car down? I thought you where using more fuel when at higher rpm

[ July 12, 2005, 12:58 PM: Message edited by: 04mustanggtkibby ]
 
Posted by bunchmyfunky (Member # 360) on :
 
I turn 3000rpms or just under at 80mph. You will love 4.10s
 
Posted by jayl (Member # 185) on :
 
www.f-body.org/gears
 




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