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Old 01-27-2015, 12:14 AM   #1
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Default What is "normal" acceleration for an Ecoboost?

I know, dumb question but let me explain.
My wife drives a 14 Sport with the EB. It is a really quick SUV. Turbo lag is non existent, it has power everywhere. Throttle response is smooth and progressive. I know the turbos are smaller and it's not the same platform. Nevertheless, it is all I can compare it to.
I drive a 2014 FX4 screw with 3.55's. I put 1,000 miles on it and then leveled with 275 65 20 Duratracs. I now have 3500 miles. Maybe my hopes were too high but it seems inconsistent with power. When accelerating, it seems to do so in steps. At less than half throttle, I can hear it dumping boost. Once I push it down harder, it's like it starts pulling in waves. It's not like it feels like something is really wrong, it just doesn't climb the tach like the Explorer. It pulls the hills on the interstate in 6th but doesn't take much pedal for a downshift. A punch of the pedal at 20 mph is strong. That is when it "feels" good.
Not trying to compare it to the Explorer directly. The wife had an easy time getting around the truck (still hearing about it). But the engine characteristics are pretty far apart.
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Old 01-27-2015, 09:56 AM   #2
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Default Re: What is "normal" acceleration for an Ecoboost?

With your heavier, larger diameter tires your acceleration is going to be less than normal. I'm just guesstimating here but...with the extra 2" diameter of your tires your 3.55 gear ratio is probably now closer to 3.31 .
The stock shifting strategy also leaves quite a bit on the table. A good tune makes a huge difference. Your wife's Sport would also be a whole different animal with a tune. But it is about 1k lbs lighter and more aerodynamic.
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Old 01-27-2015, 11:36 AM   #3
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Mine really isn't so dissimilar with the 3.7L's just a harder pull when I want to really ask for torque. My wheels are the same, only the axle ratios differ.
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Old 01-27-2015, 11:49 AM   #4
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Turn on Tow/Haul and do a comparison test. It holds gears longer, compared to the standard shift strategy which is more concerned with MPGs. If you feel the difference you were looking for, that will tell you it's the tune.
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Old 01-27-2015, 07:27 PM   #5
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Ford has really changed the truck to prevent the condensation shudder. They have made it so that the turbos don't spool as quickly to prevent them from pushing a slug into the engine. It has really made the truck sluggish IMHO. Tuning it helps bring the truck to what it should be.
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Old 01-27-2015, 08:27 PM   #6
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Ford has really changed the truck to prevent the condensation shudder. They have made it so that the turbos don't spool as quickly to prevent them from pushing a slug into the engine. It has really made the truck sluggish IMHO.
Probably so in most cases.... but my 2014 is 500 lbs lighter than my 2011 and it has 4.10 gears so it was almost as quick stock as my 2011 w/3.73's was tuned. Now that the 2014 is tuned it's a lot quicker.
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Old 01-27-2015, 08:32 PM   #7
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4.10's so must be a tremor. Your are probably the first person I have heard say a 13 or 14 is faster than a 11. But the gears probably allow the revs to come up specially with less weight. Not sure though. Don't know if you are on .net or not but lots of modded tremors there doing some fast times. One guy went to smaller gears and hit 12.6.
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Old 01-27-2015, 08:38 PM   #8
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Not sure though. Don't know if you are on .net or not but lots of modded tremors there doing some fast times. One guy went to smaller gears and hit 12.6.
I'm not a member but I've seen that thread. Haven't checked it recently but I remember someone asked him what he ran with 4.10s and he never replied back (at least the last time I checked he hadn't). It probably wouldn't make much difference at my local 1/8 mile track but it would in the 1/4.
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Old 01-27-2015, 09:12 PM   #9
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12.9 iirc. Ya theory is that it gives the computer more time to add timing between shifts. That is why most of the fastest ones have short gears. But 1/8 I would think your gears would work better since it is the launch that means the most.
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Old 01-28-2015, 01:35 AM   #10
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Are thise duratracs the same size as stock? If you dont correct the tire size in the cmp can throw off shift points and who knows what else. These trucks have tables in tables on tables in hidden tables so anything that changes can have an impact.
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