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F150 with the 3.5L twin turbo eco boost

236 messages,  Last post on Apr 21, 2013 at 8:42 PM

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What is this discussion about? Ford F-150, Truck

Messages Page 7 of 24

#60 of 236 Re: 2011 Ford F150 Eco Boost [cat125] by bubbabud

Jul 02, 2011 (6:58 am)

Replying to: cat125 (Jun 20, 2011 6:17 pm)
Torque is the amount twist at agiven RPM. the more torque and higher RPM equel more horsepower. the Ecoboost deveopes its max torque at lowerRPM hence it can do more work at alower engine speed. Ideal for trucks. I took delivery of my Ecoboost F150sc on 05/30 2011 and have only put 1600 miles on it but it is averageing 21.3MPG On a trip to Flagstaff AZ. elev. 7000 ft.Inoticed NO drop in power The torque is comparable to my first dodge diesel.Now if it will just stay together this truck will be awsom.

#61 of 236 Re: 2011 Ford F150 Eco Boost [bubbabud] by cat125

Jul 02, 2011 (8:56 am)

Replying to: bubbabud (Jul 02, 2011 6:58 am)
have you noticed a slight vibration at idle in drive or reverse ??? it goes away when place in neutral or park . thought it was cheap gas but its not -

#62 of 236 Re: 2011 Ford F150 Eco Boost [bubbabud] by wwest

Jul 04, 2011 (10:13 am)

Replying to: bubbabud (Jul 02, 2011 6:58 am)
"...EcoBoost develops its max torque at lower RPM..."
 
Well, yes, but ONLY when WOT or very close thereby.
 
At lower RPM cruise mode, partial throttle openings, there is simply not enough WASTE exhaust energy to SPIN the turbine section, so the wastegate is left in the bypass position.
 
Therefore, in comparison, the Ecoboost engine does not provide a reasonable level of torque for simply cruising along towing even a light load, and certainly not uphill. In point of fact the Ford Ecoboost design actually sacrifices cruise power, MPG (***), in order to produce "stellar" WOT "on-boost" torque levels.
 
*** The "standard" compression ratio for DFI engines is now at 12-14:1, but Ford runs the Ecoboost in detuned/derated mode, ~10:1 CR during simple cruise mode in order to provide for the effective CR to be above 14:1 ONBOOST/WOT.
 
Take away the turbo and raise the CR to 12:1 and cruise HP/torque/mpg would rise substantually. Or adopt Toyota's E-VVT-i intake valve closing delay technique and run the engine with 12-13:1 CR, Otto mode, for cruising, and revert to 10:1 CR with the wategate closed, on-boost, simulated Miller cycle.

#63 of 236 Eco by cat125

Jul 04, 2011 (11:28 am)

So what does this really mean - it has torque but not optimal torque - the truck feels like its quick and light but yoiu are saying its not because of torque ???? its more a matter of speed and not power ??? what is WOT ???

#64 of 236 Re: 2011 Ford F150 Eco Boost [wwest] by ironjasper

Jul 04, 2011 (11:35 am)

Replying to: wwest (Jul 04, 2011 10:13 am)
I have an ecoboost F-150 with a 3.55 LS rear and it has plenty of torque for cruising (even up hill) without wide open throttle ..... I have not towed anything yet, but I would imagine when you do the gas mileage will suffer.
 
However, for normal cruising to work or around town there is plenty of power and the mileage has been about 18 mpg with 23 on the highway. This is even better than I expected.

#65 of 236 Re: 2011 Ford F150 Eco Boost [wwest] by dieselone

Jul 05, 2011 (7:40 am)

Replying to: wwest (Jul 04, 2011 10:13 am)
"...EcoBoost develops its max torque at lower RPM..."
  
Well, yes, but ONLY when WOT or very close thereby.
 
Duh, that's the case for any engine. Your posts are comical.
 
The 5.4 v8 in my Expedition produces something like 365ft-lbs of torque at 3600rpm or so and it has pretty good off idle torque output. Trust me, when I'm towing my boat or travel trailer, I MUST FLOOR it to get max towing power whether at 2k rpm or 4k+.
 
Have you ever driven a DI turbo engine? I've driven a few 4cyl DI turbos and I've found the power to be very linear. I never needed to floor them to get power and it they were noticeably more powerful at part throttle and low rpm vs a n/a 4cyl and v6's I've driven.

#66 of 236 Re: 2011 Ford F150 Eco Boost [dieselone] by wwest

Jul 05, 2011 (3:32 pm)

Replying to: dieselone (Jul 05, 2011 7:40 am)
"...I've found the power to be very linear..."
 
Yes, lots of "magical-like" things can be done with/in the DBW firmware between the accelerator pedal position sensors and the throttle plate servomotor.
 
The accelerator pedal can have a perfectly linear "feel" while the throttle plate (and Turbo waste-gate) movement can be totally erratic, non-linear, in response.

#67 of 236 Re: 2011 Ford F150 Eco Boost [wwest] by dieselone

Jul 05, 2011 (6:35 pm)

Replying to: wwest (Jul 05, 2011 3:32 pm)
Yes, lots of "magical-like" things can be done with/in the DBW firmware between the accelerator pedal position sensors and the throttle plate servomotor.
  
The accelerator pedal can have a perfectly linear "feel" while the throttle plate (and Turbo waste-gate) movement can be totally erratic, non-linear, in response.
 
That's all I care about is how well it works.
 
Ford is far from the only manufacturer using turbo charging with DI. You should be bashing VW, Mazda, BMW, Hyundai and others that use the same basic design. Turbocharging is not going away.
 
DI and high compression alone isn't going to produce usable torque like a much larger engine. Boost is currently the only way to do it.

#68 of 236 Re: 2011 Ford F150 Eco Boost [dieselone] by brucelinc

Jul 06, 2011 (7:32 am)

Replying to: dieselone (Jul 05, 2011 6:35 pm)
Good luck convincing wwest of anything.
 
One of the benefits of two small turbos instead of one big one is that they spool up and generate boost more quickly - even at part throttle. Most of the critics of the 3.5 ecoboost engine have never experienced it.
 
http://news.pickuptrucks.com/2010/09/2011-ford-f-150-ecoboost-v-6-photos-and-add- itional-engine-details.html
 
The above link shows the torque curve of the ecoboost at part throttle and at WOT. It also shows the torque curves of some competitors.

#69 of 236 Re: 2011 Ford F150 Eco Boost [brucelinc] by dieselone

Jul 06, 2011 (7:39 am)

Replying to: brucelinc (Jul 06, 2011 7:32 am)
Good luck convincing wwest of anything.
 
 
Oh I know.
 
The above link shows the torque curve of the ecoboost at part throttle and at WOT. It also shows the torque curves of some competitors.
 
Great post. Gotta love that torque curve even at...um part throttle.

Messages Page 7 of 24

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