Fiesta ST "Big" Turbo Upgrade guide

Posted by Timothy Pownall on

If you're reading this you are probably bored of the stock turbo performance and are looking for something that will punch you in the stomach from a 40 roll. We've all been there.  I myself have had 4 fiesta ST's and two of them were upgraded turbo.  I've been in the Fiesta and Focus scene since 2013 and have seen it all. 

"So we get it, you're a fiesta dinosaur" you may be saying, well today are the golden days for the Fiesta ST MK7.5 (14-19 USDM) as the options have never been broader.

Here are some of the options available on market and we will classify them as a big turbo or hybrid turbo which is the slang used with the Fiesta/Focus owners. 

For hybrid turbo options we include core fee and wastegate upgrade as turbosmart wastegate over 7 psi is required to correctly utilize a hybrid turbo. 

What is a hybrid turbo?

A hybrid turbo is stock turbo that has been fitted with larger wheels (and sometimes shaft/bearings) as well as being machined to fit bigger internals.

Pros:

  • Spools close to stock depending on wheel size/design
  • Cheapest options on the market and direct bolt on and direct fit (stock bov/wastegate fitment type)


Cons:

  • A hybrid turbo is still utilizing the stock turbine housing and as the turbine housing is pushed out of it's efficiency range the turbo puts out lots of heat resulting in even the best intercooler of seeing +40 degree charge air temps after a 4th gear pull.  This heat over time can result in the deck of the block cracking. The VT330R is the only exception here as it does a great job at keeping down temps due to it's larger compressor cover and k04 internals. 
  • No longer relevant post 2019 as there are now multiple direct bolt on big turbo options with close to stock spool and very little heat output.

What is a big turbo?
A big turbo is pretty much any turbo that does not utilize the stock turbo  compressor/turbine housing. 

Pros:

  • Very efficient and little heat output compared to a hybrid turbo
  • Long life/reliability as the components are not being stressed from extreme housing temperatures


Cons:

  • Can drastically change the response and feel of the car and spool needs to be taken into consideration as well as average HP over the curve as opposed to peak hp numbers.
  • Price 

 

Popular Hybrid Turbos options:

  • Pumaspeed X-47R
  • VUDU VT330R
  • Whoosh Hybrid

Popular Big Turbo options:

  • ATP kit Garrett gtx2860r gen2
  • ATP kit Garrett gtx2867r gen2
  • Turbo Technics S280
  • Pumaspeed X-57/X-57RS


Detailed turbo information:

(NOTICE):

All power/spool numbers are based on first hand experience, or 3rd party (non vendor provided) dyno figures under 1,000 ft altitude.  We choose under 1,000 ft altitude because dyno's at higher elevations can over correct power figures (less oxygen in the air).  Due to the complexity of the dyno corrections it's more reliable to use power figures that were not obtained on high altitude dynos.  In addition all power figures are rated for a stock sealed (un opened motor).  Power figures can drastically change as the factory head/cams are changed so we do not include results from non-stock engines.

Pumaspeed X-47R:

Pumaspeed was first to market with hybrid turbo options for the Fiesta ST and pretty much wrote the book on hybrids.  The X-47R is the evolution of the x-27,x-37,x-47.  Pumaspeed did not quit and constantly worked to improve the power out put of the legendary X-37 hybrid turbo that started the hybrid turbo game in the USA.  

Power potential:
91 octane: 270whp
93 octane: 285 whp
E30+: 320 whp

Requires optimized tuning for best spool: No
3rd gear spool (25 psi) 3300 RPM
Direct bolt on: Yes
Direct fit: Yes (utilizes stock bov/wastegate mounting)
Type: Hybrid
Price with wastegate: $1399
Warranty: 1 year or 12,000 miles

VUDU VT330R:

While this hybrid turbo may cost a bit more than other options on the market, this hybrid option still utilizes the stock turbine housing, however it is fitted with an aftermarket compressor housing.  The larger compressor cover helps drastically reduce charge air temps, a problem that plague most hybrid turbos.  I've personally tuned a few of these and the charge air temp decrease from other options is pretty drastic.  The downside to the larger compressor cover is that this turbo will spool like other hybrids, but require the tuner optimize the VCT/Fuel/Spark to get spool time down. 

Power potential:
91 octane: 275 whp
93 octane: 290 whp
E30+: 320 whp

3rd gear spool (25 psi) 3300 RPM
Requires optimized tuning for best spool: Yes
Direct bolt on: Yes
Direct fit: Sort of (utilizes stock bov, aftermarket wastegate fitting)
Type: Hybrid

Price with wastegate: $1749
Warranty: 1 year or 12,000 miles

Whoosh Hybrid Turbo:

While being on of the newer hybrid turbo options on the market, it is currently one of the popular domestic options.  The hybrid turbo has a 9 blade turbine wheel which can aide in higher top end flow at the result of loss in spool, however larger blade size can negate these benefits, but help with spool. 

Power potential:
91 octane: 265 whp
93 octane: 280 whp
E30+: 315 whp

3rd gear spool (25 psi) 3300 RPM
Requires optimized tuning for best spool: No
Direct bolt on: Yes
Direct fit: Yes (utilizes stock bov/wastegate mounting)
Type: Hybrid
Price with wastegate: $1619
Warranty: 1 year or 12,000 miles

ATP GTX2860R GEN 2:

One of the most popular big turbo options on the market.  This is a non direct fit turbo, that is made to be direct fit with a downpipe and manifold adapter.  The .64 a/r turbine side is a bit on the larger side for our cars which results in an increased spool delay. 

Power potential:
91 octane: 280 whp
93 octane: 300 whp
E30+: 350 whp @ 28 psi
E30+: 390 whp @ 34 psi

3rd gear spool (25 psi) 4300 RPM
Requires optimized tuning for best spool: Yes
Direct bolt on: Yes
Direct fit: No (requires vacuum source and mechanical bov)
Type: Big Turbo
Price with wastegate: $2065
Warranty: No


ATP GTX2867R GEN 2:

One of the most popular big turbo options on the market.  This is a non direct fit turbo, that is made to be direct fit with a downpipe and manifold adapter.  The .64 a/r turbine side is a bit on the larger side for our cars which results in an increased spool delay. 

Power potential:
91 octane: 295 whp
93 octane: 315 whp
E30+: 380 whp @ 28 psi
E30+: 440 whp @ 36 psi

3rd gear spool (25 psi) 4800 RPM
Requires optimized tuning for best spool: Yes
Direct bolt on: Yes
Direct fit: No (requires vacuum source and mechanical bov)
Type: Big Turbo
Price with wastegate: $2155
Warranty: No

Turbo Technics S280:

One of the newer options on the market, the turbo utilizes a bespoke casted turbine and compressor housing emulating the design of the stock turbo with larger housings.   The turbo is a direct fit and utilizes the stock bov/wastegate design. The lack of cut back turbine blades allows for slightly better spool over the X-57, but results in a loss of top end power.  This turbo utilizes a K04 based design.

Power potential:
91 octane: 275 whp
93 octane: 295 whp
E30+: 335 whp @ 28 psi
E30+: 375 whp @34 psi
3rd gear spool (25 psi) 3200 RPM
Requires optimized tuning for best spool: Yes
Direct bolt on: Yes
Direct fit: Yes (utilizes stock bov/wastegate mounting)
Type: Big Turbo
Price with wastegate: $1599
Warranty: No


Pumaspeed X-57 (base model):

One of the newer options on the market, the turbo utilizes a bespoke casted turbine and compressor housing emulating the design of the stock turbo with larger housings.   The turbo is a direct fit and utilizes the stock bov/wastegate design. The X-57 was designed has a minor edge over the s280 with cut back turbine blades for higher flow as well as a larger base shaft and bearing design. This turbo utilizes a K04 based design. 

Power potential:
91 octane: 280 whp
93 octane: 300 whp
E30+: 340 whp @ 28 psi
E30+: 380 whp @ 34 psi
3rd gear spool (25 psi) 3200 RPM
Requires optimized tuning for best spool: Yes
Direct bolt on: Yes
Direct fit: Yes (utilizes stock bov/wastegate mounting)
Type: Big Turbo
Price with wastegate: $1599
Warranty: 1 year or 12,000 miles

Pumaspeed X-57 (RS 9 Blade):

This turbo is the uprated version of the X-57RS and the most capable bespoke casted turbo on the market.  While costing you $450 more over the S280 and X-57 Base model, the X-57RS is based on a K16 bearing and shaft design making it the most robust option for a direct fit turbo.

Power potential:
91 octane: 280 whp
93 octane: 300 whp
E30+: 355 whp @ 28 psi
E30+: 400 whp @ 34 psi
3rd gear spool (25 psi) 3600 RPM
Requires optimized tuning for best spool: Yes
Direct bolt on: Yes
Direct fit: Yes (utilizes stock bov/wastegate mounting)
Type: Big Turbo
Price with wastegate: $1950
Warranty: 1 year or 12,000 miles

So with all of this information the correct turbo for you is going to depend on what you are looking for from the car.  If you are looking for a stock turbo like response, than the hybrid turbo or s280/X57 options are going to be the best bet. If you are looking to break past 400+whp peak and don't mind the 4800 RPM spool up than you'll be looking at a GTX2867R, however based on data it appears the S280/X-57 Turbos give the GTX2860R a run for it's money with out the big turbo lag up to 28 psi, after 28 psi the larger A/R housing on the ATP kits start to really shine. 

Please note any turbo option will require a fuel upgrade after 295whp to maintain a healthy AFR. 


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