jay1028

I'd like some popcorn too.

marshallr

I can hop on my 21 speed mt bike and peddle up an incline in 1st gear with very high leg rpm, or do it in 5th gear with less leg rpm. It is certainly less stressful on my legs to use higher rpm's.

A truck engine is no different.

Deerchaser

Absolutely!

chimmike

lmao...what?

did you read the literature I posted?

go borrow the book from the library and read just the first chapter or so.

mass-hole

You know, modern mtn bikes have gone from 21/24 speeds to 10 or 11. I have a single front gear on my bike that is the same size as the middle ring on your bike and much prefer it to having a super low first that causes me to spin to the moon. Spinning super fast, just because you need less strength(torque), doesnt mean you will get there faster or with less cardio exhaustion.

RedsRock302

My only question is this, is the 10 speed really better for the Ecoboost engine? No doubt it is for the 5.0, as it wants/needs to rev to get to its power band. But the Ecoboosts low end flat torque curve...is kind of killed by the 10 speed keeping it in the upper RPM ranger longer, even on shifts. But that is just me. No way of ever knowing since the Gen 2, more powerful ecoboost, only came in the 10 speed.

mass-hole

I dont think it is as important on the EB from a performance or towing standpoint. The engine already made enough hp/torque to pretty much run anywhere in the RPM band without issue. I am sure it helps but not as much as the 5.0.

Where it helps is in efficiency, it allows the engine to stay much closer to the optimal RPM in all conditions. It also allows them to stretch the ratios way out so that it has a super tall highway gear when not under load and you can run a taller axle ratio without hurting the 1st gear low end. The EB has the low end torque to lug out a tall gear much like a diesel.

I think the motor that will benefit the most from having the 10 gears is the diesel. People think diesels have a broad torque curve but the reality is that the diesel operates in a very narrow window. peak torque is at 2000 rpm usually and by 3500 rpm the torque is plummeting. Redline is at around 4000 rpm so the diesel cannot afford to drop down 3 gears like a 5.0 or Ecoboost and run in 3rd at 65 mph. Having 10 speed with small steps between gears will help keep the diesel right where it needs to be.

acdii

Semi's use 9,10,13,15,18 speed transmissions to keep the diesel in its power band which is usually around 400 RPM between gears, keeping the RPM about 1800. The redline is much lower than in pickup engines too. Above 2000 RPM they pretty much peter out.

BlackBoost

Comparing human legs and muscles riding a bike (which humans aren't meant to do naturally) to an engine is about the funniest thing I've ever read Yes my engine does get tired after a while and then needs a break, some Gatorade, and some A-535 on that sore engine...


That post just got printed and is going on the wall in the engineering office lol

mass-hole

I though of this while riding the other day. As long as there is gas in the tank an engine doesn't care. If I sprint as fast as I can up a hill on my bike I am spent in 10-15 seconds and need to back off.

The other argument for this is that just cause he can't do it doesn't mean lance armstrong(someone who makes a lot of torque) couldn't comfortably pedal up the same hill in 24th gear.