2009 - 2014 F-150

Ecco boost for towing?

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Old Aug 28, 2008 | 08:16 PM
  #16  
Rambo's Avatar
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Originally Posted by Power Kid
Ok true more tq down low, although at 340 NOT more peak tq. Unless we ahve more that 340. Although I never want to be in a debate where I'm promoting the tq of a 5.3!
Specs of new XFE model Gm 5.3L for 09: "320 horsepower and 340 pounds-feet of torque"

My point is we're all so excited about this engine like its the next big thing ( I could have used an example like Obama here but I don't want to get that debate going) and yet its peak output is very close to the aging 5.3L GM that we all feel is BORING....

Now if ecoboost is closer to 400ftlbs in tq and in real world driving does have a measurable MPG advantage... then I'm back on the bandwagon.
Then get back on the bandwagon. Ford said it would have significantly more than 340.
 
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Old Aug 28, 2008 | 08:47 PM
  #17  
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Originally Posted by Power Kid
Ok true more tq down low, although at 340 NOT more peak tq. Unless we ahve more that 340. Although I never want to be in a debate where I'm promoting the tq of a 5.3!
Specs of new XFE model Gm 5.3L for 09: "320 horsepower and 340 pounds-feet of torque"

My point is we're all so excited about this engine like its the next big thing ( I could have used an example like Obama here but I don't want to get that debate going) and yet its peak output is very close to the aging 5.3L GM that we all feel is BORING....

Now if ecoboost is closer to 400ftlbs in tq and in real world driving does have a measurable MPG advantage... then I'm back on the bandwagon.
For towing I'll take 340 tq from 1,500 rpm up all day long over a relatively peaky 340 or even 400 at 3,500 or 4,000 rpm. While I hope it is more than 340 lb ft too, comparing a NA 5.3 (especially) or really any mid size NA V8 to a turbo of similar power is apples to oranges for towing. The turbos will spool under load whether getting up to speed or maintaining speed at low rpm (which is where almost all NA gassers except some big cubics fail miserably imo). For instance, my dyno sheet shows my torque peaking at around 3,750 rpm which I may touch while accelerating a load up to speed. However while pulling at 65 mph it would be well under the fat of the torque even in 3rd and forget about it in OD. The NA engine has to be at optimum rpm to get all of its power and that is usually well above the rpm you want to tow (or drive except when racing). A well designed turbo system should provide a near flat torque curve (at or very near max tq) from around 1,500 to ~4,000 or so on gas. This gives you more torque and therefore more available hp at much lower rpms and you could likely tow the same load at 65 even in OD at say 2,000 rpm. I'm not saying this 6 cyliner ecoboost will be a tow monster like a 5.9 cummins turbo diesel but it doesn't need to do much to out tow any of the current gassers imo. Personnaly though I don't know why they don't make it an inline 6 or small V8. Better engine design and at such a small displacement should easily fit into a truck engine bay even with the turbos. Probably the bean counters thinking they will squeez it in several different vehicles.
 
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Old Aug 28, 2008 | 09:44 PM
  #18  
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I would want to know more about long term durabillity, but otherwise agreed.
 
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Old Aug 29, 2008 | 08:14 AM
  #19  
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From: Linn, MO
Originally Posted by Power Kid
Ok true more tq down low, although at 340 NOT more peak tq. Unless we ahve more that 340. Although I never want to be in a debate where I'm promoting the tq of a 5.3!
Specs of new XFE model Gm 5.3L for 09: "320 horsepower and 340 pounds-feet of torque"

My point is we're all so excited about this engine like its the next big thing ( I could have used an example like Obama here but I don't want to get that debate going) and yet its peak output is very close to the aging 5.3L GM that we all feel is BORING....

Now if ecoboost is closer to 400ftlbs in tq and in real world driving does have a measurable MPG advantage... then I'm back on the bandwagon.
Remember, it's not all about peak numbers. I can't remember the last time my 5.4 saw the peak torque at 3750 RPM's (I think that's where it is). Even while towing, I don't normally rev that high. The peak torque of the 5.4 is less than the hemi, but the 5.4 will tow right with the hemi. The flat torque curve of the 5.4 (and even flatter of the ecoboost) can make up for a huge difference in peak numbers.

Like you though, if we're touting torque in a GM engine, I think we're in for serious trouble!
 
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Old Aug 29, 2008 | 08:17 AM
  #20  
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From: Linn, MO
Originally Posted by BlackDawg
For towing I'll take 340 tq from 1,500 rpm up all day long over a relatively peaky 340 or even 400 at 3,500 or 4,000 rpm. While I hope it is more than 340 lb ft too, comparing a NA 5.3 (especially) or really any mid size NA V8 to a turbo of similar power is apples to oranges for towing. The turbos will spool under load whether getting up to speed or maintaining speed at low rpm (which is where almost all NA gassers except some big cubics fail miserably imo). For instance, my dyno sheet shows my torque peaking at around 3,750 rpm which I may touch while accelerating a load up to speed. However while pulling at 65 mph it would be well under the fat of the torque even in 3rd and forget about it in OD. The NA engine has to be at optimum rpm to get all of its power and that is usually well above the rpm you want to tow (or drive except when racing). A well designed turbo system should provide a near flat torque curve (at or very near max tq) from around 1,500 to ~4,000 or so on gas. This gives you more torque and therefore more available hp at much lower rpms and you could likely tow the same load at 65 even in OD at say 2,000 rpm. I'm not saying this 6 cyliner ecoboost will be a tow monster like a 5.9 cummins turbo diesel but it doesn't need to do much to out tow any of the current gassers imo.
Well said, and I agree.

Originally Posted by BlackDawg
Personnaly though I don't know why they don't make it an inline 6 or small V8. Better engine design and at such a small displacement should easily fit into a truck engine bay even with the turbos. Probably the bean counters thinking they will squeez it in several different vehicles.
Plus the fact that the 3.5 already exists.
 
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