turbo lag???
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Freshman User
Joined: Oct 2006
Posts: 42
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From: calgary,ab,canada
turbo lag???
Has anyone had a problem with turbo lag or what feels like a dead spot? It has twice where i go to change lanes in traffic and there is no response. For a split second you think that engine has stalled !! Have had the flash done. got 4000k
Senior User
Joined: May 2008
Posts: 197
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My pedal feels similar. Pressing a little, or pressing a lot, doesn't make much difference. After a few seconds, maybe two or three, things "index" and the engine responds proportionately, albeit severely delayed. I only have 400 miles on mine, and have had the flash at the factory, but am hoping condition lessens with break in. Looking at the AFE or S&B cold air kits, and an exhaust, to reduce the annoying lag. Some people are happy with the pickup of their pickups, and I wonder if these people are just coming from a really sluggish previous ride, or if there is something "off" on some of our trucks? In my experience so far, once this truck has been floored a while, full throttle passing is better than previous generations (even chipped ones), but the initial lag is worse...Too bad the tuners just don't have anything yet. Has anyone tried the aftermarket air intakes yet? Noticeable improvement?
Elder User
Joined: Mar 2007
Posts: 879
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From: at the truck pulls
Here's a stab in the dark. Is this y'alls first diesel? It is mine and I had to get used to it a bit because I was used to INSTANT power. After seeing everything about diesels these new 6.7 seem to be the best yet.
Senior User
Joined: Apr 2005
Posts: 357
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From: Anchorage, Alaska
So it's trimming that sudden burst of fuel down to prevent and over fuel condition, or maybe even a possible over fuel condition under certain circumstances.
That is just my take on why they are like that. Not sure exactly why...never researched it.
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Senior User
Joined: Aug 2010
Posts: 194
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From: Saugus,CA
I notice a lot of the newer diesels with newer emissions like DPF's are very sluggish on hard acceleration. Many of the medium duty truck I work on have this problem. I think it is a built-in emissions strategy to prevent an overfueling condition in which it emits too much of something. Delaying the fuel and easing it into desired fuel (how much foot you have in the pedal) helps keep the new emission standard low for more emission "credit" towards other emission items that may not be as efficient as the EPA would like them to be.
So it's trimming that sudden burst of fuel down to prevent and over fuel condition, or maybe even a possible over fuel condition under certain circumstances.
That is just my take on why they are like that. Not sure exactly why...never researched it.
So it's trimming that sudden burst of fuel down to prevent and over fuel condition, or maybe even a possible over fuel condition under certain circumstances.
That is just my take on why they are like that. Not sure exactly why...never researched it.
Sounds like a logical observation to me.
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Junior User
Joined: Sep 2010
Posts: 67
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From: Alberta, Canada
Well, I'm very disappointing in the turbo lag right off idle and am not that used to having to wait longer than usual in city traffic. I came from a DPF GM diesel that did not have anywhere close to the turbo lag this truck has. I hope Ford can fix what I feel is a safety issue for city stop/start driving IMO.
Rick
Rick
Senior User
Joined: May 2008
Posts: 197
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I agree RickSo! Acceleration on these trucks is like watching paint dry...then wham, suddenly you've overcompensated for the lag, and the truck is accelerating more quickly than you wanted. My six-oh had about 3/4 seconds of lag; this new truck is more than double that. Perhaps a tuner adding a few hundred more horsepower and different timing could make these trucks fun again? Or maybe our trucks all vary significantly in performance?
Senior User
Joined: Apr 2005
Posts: 357
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From: Anchorage, Alaska
Like I stated earlier, I don't think its turbo lag. I think it's fuel limiting. The variable turbos do not have that amount of lag, given the proper amount of fuel introduced. Especially this new-fangled twin compressor concept. Why would they step backwards? Of course they have gone backwards somewhere, but I don't think it was the turbo department. I think it is the emissions department.
The exhaust part of the turbo looks exactly like the 6.0 turbo and operates the same way. I think it is a ball bearing turbo instead to increase angular velocity of both the compressor wheels and handle the extra weight of the second wheel on the turbine shaft.
Of course, without boost there is no fuel, but it has to start somewhere and fuel is how it is started.
The exhaust part of the turbo looks exactly like the 6.0 turbo and operates the same way. I think it is a ball bearing turbo instead to increase angular velocity of both the compressor wheels and handle the extra weight of the second wheel on the turbine shaft.
Of course, without boost there is no fuel, but it has to start somewhere and fuel is how it is started.
Logistics Pro
Joined: Oct 2008
Posts: 4,818
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From: Avilla, IN
Sounds to me like something isn't right. I've heard that there is basically no lag on these new engines. I was walking down the sidewalk, when a 6.7 pulled out of the post office and punched it. It didn't appear to have any lag. I was most impressed with the lack of decibels given how hard he was pushing it!
Senior User
Joined: May 2008
Posts: 251
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Sounds to me like something isn't right. I've heard that there is basically no lag on these new engines. I was walking down the sidewalk, when a 6.7 pulled out of the post office and punched it. It didn't appear to have any lag. I was most impressed with the lack of decibels given how hard he was pushing it!
