Ecoboost - low rpm boost numbers
05-23-2011, 10:32 PM
#11
He is talking about lugging or loading the engine in top gear not from a dead stop. Mileage on a 3.55 and 3.73 is not gonna be much difference. In fact hwy mileage for the 3.55 should be better since it is turning a lower rpm than the 3.73 gear. Neither one of these gear ratios are gonna be so bad off that the engine has to kill itself to move the truck. Now if u compared a 2.73 to a 3.73 then u might have an argument.
05-23-2011, 10:57 PM
#12
Originally Posted by triglet
He is talking about lugging or loading the engine in top gear not from a dead stop. Mileage on a 3.55 and 3.73 is not gonna be much difference. In fact hwy mileage for the 3.55 should be better since it is turning a lower rpm than the 3.73 gear. Neither one of these gear ratios are gonna be so bad off that the engine has to kill itself to move the truck. Now if u compared a 2.73 to a 3.73 then u might have an argument.
05-23-2011, 11:04 PM
#13
Senior Member
It simply has to do with the power band why 3.55 is a little quicker to 60. The engine is pulling longer in the strongest part off the power band (4000rpm) and not falling off the torque peak as my 3.73's do as it redlines right around 60, making it's shift into 3rd.
I'd bet the 3.73 is quicker to 50 mph, specially pulling a load.
I'd bet the 3.73 is quicker to 50 mph, specially pulling a load.
05-24-2011, 12:32 AM
#14
[QUOTE="dcfluid"]It simply has to do with the power band why 3.55 is a little quicker to 60. The engine is pulling longer in the strongest part off the power band (4000rpm) and not falling off the torque peak as my 3.73's do as it redlines right around 60, making it's shift into 3rd.
You are correct sir
You are correct sir
05-24-2011, 01:37 AM
#16
Senior Member
the 3.73 will put less load on the engine, therefore it will pull more (it's own weight or with a load) with less boost THEREFORE mpg will be better
i will say it again. since its a lower rear end it takes less fuel to get moving, therefore better fuel mileage. only time that a higher rear end will help will be unloaded on flat ground then the 3.31 or 3.15 would do better- oh also better not be any wind blowing
understand?
i will say it again. since its a lower rear end it takes less fuel to get moving, therefore better fuel mileage. only time that a higher rear end will help will be unloaded on flat ground then the 3.31 or 3.15 would do better- oh also better not be any wind blowing
understand?
The lower gears, 3.55, 3.31, ect don't have the jump but are more efficent at higher speeds as the motor needs the rev less so this is more fuel efficent.
same 2 trucks, one with 3.73 and one with 3.31. Get both up to 60 mph and you will see that the 3.31 will be a few hundred rpms lower vs the 3.73 thus putting less demand on the motor, burning less fuel.