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2015 Ford Fiesta ST R&D Project: Tuning with the Cobb Accessport

Posted on 16 July 2015

As mentioned in our introduction blog post, I wanted to share my custom tuning results with the car in 100% stock form. All results below were done on the same day, with the same fuel, and within 5° of the same Charge Air Temperatures to ensure consistent test results. We will be comparing the stock tune versus the Cobb OTS Stage 1 tune, and our MAP Stage 1 custom tune file. First up, a recap of Cobb OTS Stage 1 versus OEM tune on 93oct.

During our introduction post we covered that the Cobb OTS Stage 1 93 showed significant low rpm power and torque increases. Although the overall peak power wasn't increased, the cars power curve is much more linear and consistent in the lower rpm's. You definitely don't need expensive equipment like a dyno to tell you that the car is making and additional 23whp/40wtq between 2,000 and 4,500 rpms. Your butt dyno will tell you the second you crack open the throttle and rip the tires loose through 1st and 2nd gear. #thattorque

Cobb Tuning did a great job with their OTS map, but if you're like me and can't leave anything alone, you dig deeper. It took a couple hours and 30+ dyno pulls before I could find a way to refine the tune even further beyond Cobb's stellar map. With many fuel changes, new timing strategies, boost targets reset, and torque request tweaked, the dyno spit out some new numbers. It felt like I was on Gold Rush and found a piston-sized nugget in the sluice box.

Using the 3,000rpm again for a reference, our MAP Stage 1 93oct tune is producing +23.26whp and +13.32wtq over the Cobb Stage 1 93oct tune. Now if we break it down even more we can see that the dip in torque and horsepower between 2,700 and 3,400rpm's is now eliminated on the new tune. Peak power is very similar, but peak torque jumped up another +21.92wtq. We do sacrifice about ~2hp around the 6,000rpm mark because the turbo is just out of steam at this point from producing it's "mad gains" down low. Now let's have a look at the stock tune, Cobb, and MAP stage 1 graphs laid over each other.

There is no denying that we are covering some ground with the Fiesta ST, and doing it in a hurry. We are up +36.29whp/+63.63wtq (@3,000rpms) over the stock tune with the car still utilizing 100% of its factory hardware, not a single modification besides the Cobb Accessport. Now, if anybody knows me's or stalks me on the facespace. You know that I'm a corn junkie. No, not the sweet...sweet...delectable vegetable found all over the midwest, but the equally awesome maize that comes out of a pump. E85!

Don't get too excited, we aren't working with 100% e85 here we are going for the middle slot on the ole' pump handle. E30 is a great way to pick up a good amount of power, safely. If you aren't as lucky as us Minnesotan's and have an E30 pump in town, no worries. Mixing your own E30 is a lot easier than that DIY chemist set your Dad bought you (and your mom hated) for your birthday when you were 10. We are going for a 3:1 ratio of 93oct and E85 to end up with an E30 blend that goes down smooth.**

Before we get into the results of E30, let's cover the 936th reason why the Cobb Accessport is awesome. As you can see in the picture above there are 5 available "Switchable Maps". These folders contain a list of tables that can be configured to be accessible on the fly. This option is invaluable to tuners, it really cut's down on time during the tuning process. With the ability to test different fuel targets, timing, boost, launch controls, and fuel stoich. setpoints on the fly, you can find what works or doesn't work in just a few minutes versus hours. Simply press and hold the cruise control cancel button on your steering wheel, and use the set +/- buttons to flip through your available maps. With map slot 2 engaged, and some delicious blend in the tank, its time to make power.

What you are looking at here is my custom E30 tune laid over our MAP stage 1 93oct tune. With the colder burn, higher octane, and greater energy content of the E30, I am able to extract more power and torque across the entire powerband. Over our Stage 1 tune, we are looking at a +17.46whp / +30.6wtq gain at our reference point of 3,000rpms. However the most noticeable gains in power and torque of +33.55whp / +46.98wtq are at the 3,750rpm mark. Peak increase of +18.37whp / 36.74wtq over the 93oct tune.  That is a lot of numbers, let's recap.

  • 3,000rpms - +17.46whp / +30.6wtq
  • 3,750rpms - +33.55whp / +46.98wtq
  • Peak - +18.37whp / 36.74wtq

Again, the car is still 100% stock hardware with just a tune. This solidifies my suggestion that an Accessport should be your first modification when it comes to ANY vehicle platform they support.

Now, let's conclude this winded blog post. Everything you read today is available to you, our valued customer. Simply head on over to our Cobb Accessport for the Fiesta ST page, select your fuel octane, add to cart, and check out. Within hours a brand new shiny Accessport will be on it's way to you in exquisite packing from our warehouse team.

BUT WAIT! THERE'S MORE! All that buttery, power increasing, goodness above is FREE with the purchase of an Accessport from us. Simply follow the instructions at the bottom of our Cobb Accessport for the Fiesta ST page to retrieve your custom tune.***

On the next update we will be going over our first set of upgrades, a Turbosmart  Kompact BOV and Internal Wastegate. Also, the first set of testing on the MAP Fiesta Intake System, the first product of many.

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  • Jeremy Miller: November 10, 2015

    Alex Walsh

  • Waylon Boz Bosworth: November 10, 2015

    Why not just do an e85 tune?

  • Brian Freeman: November 10, 2015

    Does the accessport have EGR table access?

  • Dalton Liddle: November 10, 2015

    Lol, people here in England are making over 400hp :)

  • Dillon Mayer: November 10, 2015

    Lee Moorman

  • Tanner James: November 10, 2015

    Daniel Tingle

  • AdamatMAP: November 10, 2015

    What are you looking to achieve?

  • AdamatMAP: November 10, 2015

    DakotaRoberts1 Exactly. They are making over 400hp on turbo upgrades and build blocks. Pumaspeed is big over in the UK and they have the parts readily available. 
    We are developing a turbo kit later down the road that will support 400+!

  • DakotaRoberts1: November 10, 2015

    On a stock Fiesta ST w/ a tune? I call bullshit.

  • Waylon Boz Bosworth: November 10, 2015

    Makes sense

  • Brian Freeman: November 10, 2015

    Factory di injectors wouldn’t support the required flow.

  • AdamatMAP: November 10, 2015

    djfourmoney Use the following link. However you will need to be TUNED fro this in order to run it. You can’t put E30 on the stock tune. If you are looking for tuning services please email me at

  • djfourmoney: November 10, 2015

    Question -
     I do drag racing and of course I don’t want a bunch of fuel in the tank making my passes. So if I got this down 3:1 ratio, with needing 5 gallons to reach the track, run and be able to make it the fuel station for the trip back; that would be 3 gallons of 91 and just to make sure 2 gallons of E85?

    I have to make a trip over the hill (Santa Monica) for the E85 but I can also put the 91 in there too.
     Am I on the right track?

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