Fiesta ST Tuning - Ford 1.5 Ecoboost Development and Results.

Fiesta ST Tuning

Unlocking results from the Ford 1.5 Ecoboost.

The old Fiesta ST was a phenomenal success for Ford and a car we like very much here at Bluespark, so the new one had a lot to live up to. 

We appreciate that there are a huge range plug in units and remaps available for Fiesta ST tuning, so we wanted to share a little of our development process to show what we look into.

We had the pleasure of a visit from a returning customer with his brand new ST. We got to work and spent the day datalogging the car, finding its limitations and improving performance.

We strapped the car to our dyno for a couple of runs as standard. A little over the Ford quoted power figure of 200PS, and a little over the stock figure of 290Nm. 

This car was running 99RON fuel, so it is pretty common to see slightly stronger than stock figures.

Ford Fiesta ST Stock Power Dyno Graph

Looking at the stock graph we can see that stock torque looks like an extremely flat line, as does peak power. Almost always when you find results like this there is some software control holding the engine back to make exactly the figures the manufacturer is looking for. First we had a look at stock boost pressure across the whole rev range:

Fiesta ST Stock Throttle Closures Dyno

As you can see, boost pressure has no overshoot spike at the bottom end, and tails off with increasing RPM from 5000RPM onwards. The next place that we look is throttle position:

Fiesta ST Stock Throttle Closures Dyno

Bingo. The dashed line above shows throttle position, with the smooth line showing power. Despite my foot being flat on the pedal, the car is shutting its throttle very significantly at two points in the rev range. As the car comes on boost at 2000RPM up to around 3500RPM, and then from around 4700RPM right the way up to redline. This is a pretty common strategy of many modern ECU's. Throttle closure is a very fast acting way of regulating manifold pressure, but particularly at the top end, the car is very deliberately being held back.

We fitted our tuning system and started working on a file for the car:

Fiesta ST 1.5 Early Stage Tune

After a couple of edits we made a file that eliminated the throttle closure at the top of the rev-range, giving 233hp at peak. If we take a look at the throttle opening (dashed lines) where the stock run has a big throttle closure at the top end, the tuned version has now eliminated this. Tuned torque is improved, but nowhere near what we would like it to be. We can still see that at the bottom end of the rev range (left hand side of the graph) the throttle closure is improved, yet not eliminated.

Working on the file for a little longer we are able to improve on this very significantly:

Fiesta ST 1.5 Throttle Finished Tune

As you can see, the unwanted throttle closures have been eliminated throughout the rev range, allowing the car to make significantly more power and torque.

In the following graph you can see power and torque plotted vs the car as standard: 

Ford Fiesta ST Tuned Dyno Graph

There is a healthy improvement in power and torque throughout the rev-range, with strong gains in torque from low-rpm, maintained right up to redline. As you can see the power curve is also significantly smoother than stock.

To finish up we double check that everything is as it should be in terms of air fuel ratio, trims, and fuel pressure throughout the rev range. Just as an example, here is the Air Fuel Ratio plot vs Stock:

Ford Fiesta ST AFR Dyno Graph

As you can see, the standard target air fuel ratio (solid line) is maintained throughout the rev range.

Finally we take the car out for a road test and ensure that it drives as it should, with smooth power delivery throughout the rev range.

The car is much livelier vs stock, pick up is better and it pushes on much more eagerly. We are confident that out of available Fiesta ST Tuning options, our unit offers great results.

The final results are very close to those offered by many flash tunes, but with the advantage that our unit can be tracelessly removed in under 5 minutes. Watch our install video below: 

Our unit can also be reprogrammed for only £60.00 should you change vehicle in the future.

If you are interested in what we could do for your Fiesta, please take a look at the relevant link below or our Ford Tuning page: 

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  1. Before
    242PS 178KW 394NM
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    276PS 203KW 445NM
    Ford Kuga 2.0 EcoBoost 4x4 242PS - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
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     Great Power and Torque Gains
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  2. Before
    245PS 180KW 373NM
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    280PS 206KW 422NM
    Ford Taurus 2.0 Ecoboost 245ps - Bluespark Pro Petrol Tuning Module

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     Warranty Friendly Install (traceless once removed)
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  3. Before
    220PS 162KW 320NM
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    252PS 185KW 362NM
    Ford S-Max 2.5 T 220ps - Bluespark Pro Petrol Tuning Module

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     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
     No Quibble 28 Day Money Back Guarantee
     Our Flagship Unit
     Great Power and Torque Gains
    £174.99
  4. Before
    224PS 165KW 320NM
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    257PS 189KW 362NM
    Ford Focus 2.5 Turbo ST 224ps - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
     No Quibble 28 Day Money Back Guarantee
     Our Flagship Unit
     Great Power and Torque Gains
    £174.99
  5. Before
    305PS 224KW 440NM
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    347PS 255KW 497NM
    Ford Focus 2.5 RS 305ps - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
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     Our Flagship Unit
     Great Power and Torque Gains
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  6. Before
    245PS 180KW 373NM
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    280PS 206KW 422NM
    Ford Edge 2.0 Ecoboost 245ps - Bluespark Pro Petrol Tuning Module

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     Warranty Friendly Install (traceless once removed)
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     5 User Selectable Maps
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     Our Flagship Unit
     Great Power and Torque Gains
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  7. Before
    241PS 177KW 366NM
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    275PS 202KW 414NM
    Ford Fusion 2.0 Turbo 241ps - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
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     Great Power and Torque Gains
    £174.99
  8. Before
    241PS 177KW 340NM
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    275PS 202KW 385NM
    Ford S-Max 2.0 EcoBoost 241ps - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
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     Our Flagship Unit
     Great Power and Torque Gains
    £174.99
  9. Before
    215PS 158KW 310NM
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    246PS 181KW 351NM
    Ford Focus 2.0i 16v 215ps - Bluespark Pro Petrol Tuning Module

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     Warranty Friendly Install (traceless once removed)
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     No Quibble 28 Day Money Back Guarantee
     Our Flagship Unit
     Great Power and Torque Gains
    £174.99
  10. Before
    160PS 118KW 240NM
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    185PS 136KW 273NM
    Ford S-Max 1.5 EcoBoost 160ps - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
     No Quibble 28 Day Money Back Guarantee
     Our Flagship Unit
     Great Power and Torque Gains
    £174.99
  11. Before
    160PS 118KW 240NM
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    185PS 136KW 273NM
    Ford Galaxy 1.5 EcoBoost 160ps - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
     No Quibble 28 Day Money Back Guarantee
     Our Flagship Unit
     Great Power and Torque Gains
    £174.99
  12. Before
    239PS 176KW 300NM
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    273PS 201KW 340NM
    Ford S MAX 2.0 EcoBoost 239PS - Bluespark Pro Petrol Tuning Module

    Our Petrol Tuning Box Offers:

     Warranty Friendly Install (traceless once removed)
     Reduction in Turbo Lag
     5 User Selectable Maps
     No Quibble 28 Day Money Back Guarantee
     Our Flagship Unit
     Great Power and Torque Gains
    £174.99
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