Step-by-step guide to fit­ting a Pro Al­loy Fi­esta ST in­ter­cooler.

Fast Ford - - CONTENTS - Words & pho­tos JON HILL

The Mk7 Fi­esta ST is some­thing of a rev­e­la­tion. While fast Fo­cuses seem to have as many haters as fol­low­ers, the fiery lit­tle Fi­esta ST has al­ways won peo­ple over. And no won­der; the lat­est bolt-on tun­ing kits see the lit­tle 1.6-litre Eco­Boost jump from 180bhp to a whop­ping 300bhp-plus!

And this can be achieved with­out hav­ing to re­move the en­gine and re­place it’s in­ners. In­stead, this crazy per­for­mance can be achieved with some clever re­cal­i­bra­tion of the ECU and well-de­signed bolt-on per­for­mance hard­ware up­grades.

One of the OE com­po­nents that def­i­nitely needs a help­ing hand is the stock in­ter­cooler, which starts to strug­gle at any­thing be­yond a sim­ple first-stage remap. At the other end of the scale – the motorsport end – we have cus­tom fab­ri­cated parts that have been de­signed from the out­set to of­fer un­com­pro­mis­ing per­for­mance. And that’s what we have here.

De­vel­oped with SCC Per­for­mance, us­ing their com­pe­ti­tion and Time At­tack cars, Pro Al­loy have come up with a, quite frankly, as­tound­ing in­ter­cooler up­grade for the hum­ble Mk7 Fi­esta ST. What you get is a 62mm core that’s sim­ply mas­sive; 670x410mm, in fact. It’s so big that Pro Al­loy have even had to de­sign a new bumper crash bar as part of the kit, to work with an in­ter­cooler this size.

The re­sult­ing kit is there­fore aimed mainly at the com­pe­ti­tion mar­ket, and any­one fit­ting to a road car needs to be aware of

the struc­tural changes made to the front of the car when in­stalling this in­ter­cooler. But for com­pe­ti­tion and track cars, it re­ally is the bee’s knees. Of­fer­ing a whop­ping 210% in­crease in ex­ter­nal sur­face area, and a mind-bend­ing 175% in­crease in in­ter­nal flow area com­pared the OE in­ter­cooler, the Pro Al­loy Com­pe­ti­tion-spec unit has been proven to per­form on var­i­ous race and track cars, in­clud­ing SCC’s very own Cham­pi­onship-win­ning Time At­tack racer as fea­tured in the Oc­to­ber 2018 is­sue.

So, it looks amaz­ing, per­forms well, and sets the ba­sis for turn­ing your ST into a real lit­tle pocket rocket. But how does it all fit to­gether? To find out, we fol­lowed SCC’s Char­lie Old­man as he up­graded their own ST demo car ready for a full 330bhp con­ver­sion. Here’s what’s in­volved…

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