Page 11 - mishimotoengineering

It's been a while since our last update on the Fiesta ST cat-back exhaust and we are excited to let you in on the details of the final prototype! The last detail to square away was the exhaust tips. While the tips we had were decent, we found them a little on the plain side so we switched it up. Rather than the single-wall tips, we went with a dual-walled setup that we think look much better on the ST and will hold up better over time. Check out some photos below!

Fiesta ST exhaust tips

Chassis rigidity is extremely important for on-track handling, response, and feel. Ford provides a well-designed chassis with the Fiesta; however, as you can imagine, there is always room for improvement. Within the short time that this car has been available, the aftermarket has provided some great options, including better dampers, stiffer springs, and thicker sway bars, to enhance handling.

Our company will not likely dip into struts or springs, but we are certainly interested in helping stiffen the chassis. Our Mustang EcoBoost front strut tower brace is underway, and we recently launched development of a Fiesta ST rear strut brace. Time to get started!

What's The Plan?

Our goal here is to link one side of the rear trunk area to the other. You may wonder why this is needed. Doesn't the floor/body connect the two sides? Yes, but keep in mind, the floor is not made from a thick material. During aggressive cornering, the floor will see some pretty

After installing the Fiesta ST induction hose, it was time for the moment of truth! The Fiesta is once again up against the dyno to see what this induction hose brings to the table.

Installing the Fiesta induction hose on the ST

Fiesta ST on the dyno for Fiesta induction hose testing

Initially we were expecting this hose to help with flow through the intake, but we were certainly surprised by the results. Our little Fiesta saw gains of 5whp and 10wtq with this induction

We received our final silicone prototype for testing and got straight to installing it on our Fiesta ST. This install is a breeze! After removing two quick clamps and a barb fitting, the stock hose was out and the Mishimoto hose was installed and looking good. Take a look at our black hose option installed on the Fiesta ST.

Fiesta ST induction hose in relation to other Fiesta ST parts

Fiesta ST induction hose installed

Stock Cold-Side Features

We had it pretty easy during the design phase of our hot-side intercooler pipe. A simple design with relatively common features, not overly complicated. The cold-side is a different story.

Stock Fiesta ST charge pipe

As you can see, this pipe features a few complex pieces and also follows an unusual path. On the right side at the top of this image, you can see the end of the pipe that mates to the intercooler coupler and hose. This portion of the pipe also houses a pressure sensor, a mounting bracket, and a vacuum-line port.

You may have seen our R&D post on the full Fiesta ST intake, but this one is a little different. We are developing a silicone induction hose as solution for drivers of mainly stock Fiestas who don't want to replace their entire intake system. The stock rubber hose can be restrictive due to its shape and size. We believe that by creating a more free-flowing alternative we could see some substantial benefits without heavy modification to the Fiesta.

Stock Fiesta ST parts in the engine bay

First we examined the features of the stock hose. Aside from a barb fitting, the hose has a fairly straightforward design. The stock hose has quite a few ridges and flex sections throughout, not to mention a small inner diameter.

Interested in purchasing our 6.0L intake elbow?

We have quite a bit going on with this project! Our discounted pre-sale has launched, and we are currently accepting orders. In addition, our final prototype elbows arrived and have been test fitted to ensure appropriate fitment. Without further delay, let's take a look at our finished intake elbows.

Final Product Images

First, a lineup of the stock elbow next to our three finish options.

Stock 6.0 intake elbow (left) and three Mishimoto intake elbows, final prototypes

Time for another update on our intercooler project! Last time we left off with a foam intercooler core and some cool 3D-printed end tanks. This update is a bit more exciting!

Mock Up Prototype

With both the tanks printed and our core cut to shape, we could mate these pieces to check fitment of our existing design.

Prototype Ford Fiesta ST intercooler assembled

The tanks feature the mounting pegs and brackets to attach the cooler to the radiator and support.

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In our last post we took a look at the stock Fiesta ST downpipe as well as our slotted flange design based on the stock flange. We are still planning to create both a catted downpipe and a non-catted downpipe for race applications, so let's take a look at the progress!

Downpipe Design

After fitting the flange to the turbo, we began to piece together the rest of the downpipe coming off the flange and meeting with the exhaust. Both our designs feature a slotted flange that bolts to the turbo, in addition to a flex pipe near where they meet with the exhaust. This is important because the entire exhaust system will move a bit, and we need a flex point to allow for this. Not allowing room for flex in the downpipe would most certainly harm your exhaust system and possibly the turbo itself.
We began by laying out the components of our prototype next to the stock Fiesta ST downpipe for comparison. Check out some shots below!