VARGAS GT CAST TURBOS
UPGRADED VRSF DOWNPIPES CATLESS
VTTQ CHARGE AND INTERCOOLER PIPE KIT
3.5 BAR BOSCH MAP SENSOR
PARTAFE INTAKE FILTER SYSTEM
HKS EXTERNAL BLOWOFF VALVE
AEM WATER METH KIT
Christian lovely 2007 JDM Subaru Legacy 2.0 Spec B 5MT with Clutch slippage.
Operating boost is around 21psi.
Engine: EJ20X Dual AVCS, 9.5:1 Compression, stock small headers
Snow performance stage 2.5 water meth kit. Currently running 50/50 mixture – Start 6psi / full 25psi
DW 625 fuel pump
IHI VF45 turbo
K&N cold air intake
5mt 4.44 gear ratio
XRT XV/Crosstrek/Impreza Tuning
XRT NA-Turbo Tuning
2013 crosstrek with avo turbokit
– kit came with a higher flow fuel pump
– running the 2014 wrx dark blue injectors 565cc
5spd manual transmission from a 2013 crosstrek/impreza
AVO Recirculating 50/50 valve in which it can be adjusted
2014 wrx cat back exhaust
On Facebook:- https://www.facebook.com/XtremeRacingTuning/posts/1899622993508552
Customer’s review:- https://www.facebook.com/neo.newtron.5/posts/10218334832744315
Matt came to me on his last hope in getting his long awaiting 2005 STI tuned, after his attempts to do it himself. I believe he did a fantastic job, but a professional hand was needed for his final push pass 25psi. Uncertain with his build (operating with issues and testing over a long period of time by him,) we offer inspiration that we can achieve results, even if it is short glory – because we can show it can be done and it was DONE!!! And in 3RD Gear. That was our achievement. In 4th gear, he is well over 600whp.
It was our first time working with the MerpMod Patch, which was nothing different to the Carberry Group N rom in a sense, but it was still interesting to see that setup outside of Cobb Tuning for a 32bit ECU Car.
I am looking forward to the future where we use the ETS FMIC and a few other minor changes like 272/280 cams.
Customer review – https://www.facebook.com/matt.slough.3/posts/10222887405802569
Below are the results and some pics of the car.
Merpmod Speed Density
Dual Walbro hardwired
GM IAT near throttle body
Parallel Fuel Line w/Outfront fuel rails
1600cc FiveO Black ops inj
25i intake manifold
3″ Perrin inlet
OEM exh mani w/grimmspeed x-over
CNT 1.95″ Uppipe w/Tial 44mm ewg
CA625+ head studs
GSC +1mm valves
JE Pro-seal 1mm head gasket
Nippon racing pistons .020 over
Manley H-tuff rods
Competition Clutch Stage 4 6-Puck
ACT Streetlite 14lb flywheel
XTREME RACING TUNING is not Responsible/Liable for any ECU, Engine, Chassis or any other damages arising out of tuning and (or) logging or any other services performed. The Subaru Owner(s) accepts All Risks.
XTREME RACING TUNING expects the vehicle to be well maintained and that all maintenance been completed for tuning for a safe,effected and efficient tuning to minimised delays in tuning. This requirement is to keep within the 14 DAYS time period allotted for tuning.
Tuning much be completed within 14 DAYS of the Invoice date, unless agreed upon between Xtreme Racing Tuning and the Customer on special projects or situations.
Tuning usually takes 5 to 10 workings or a maximum of 14 working days from the Invoice date.
They will be NO refund once tuning has started.
If for some reason a refund is requested within THREE (3) DAYS of the invoice date and they have been no tuning, Xtreme Racing Tuning will refund 75% of the Invoice value. Otherwise, they will be no refund after THREE (3) DAYS of the Invoice date.
The Subaru Ascent FA24DIT MGT22 Turbo in operation is equivalent to the Garrett GT2860R – based on logging data. Therefore, its turbo compressor graph possibly looks like the one shown below:
The FA24DIT in the Subaru Ascent run a Volumetric Efficiency (VE) of around 95% from 4400-5600rpm, dipping to less than 90% @ 6000rpm. Due to the turbo size and other engine factors, it is very efficient from 2000rpm to 4000rpm. The PR at 5600rpm from logs is 1.8 (11.5psi).
Based on the Subaru engine logging data and engine flow analysis, I see around 30lb/min. Given that Subaru’s tend to run rich, I would expect the flow to be around 27lb/min. That being said, the MGT22 could flow up to 32+lbmin at high compressor speeds with a lower efficiency of 65% or less. That is more hot air. To achieve a flow of 32lb/min, the turbo will need to push 18psi of boost at 5600rpm. That will net 320chp or around 270+whp. A good avg of 250whp could be expected on the stock exhaust system. For those searching for more torque, this can be easily had since the turbo is small, but the turbine will be spinning a little faster. That implies a little more heat and a nice water spray would help keep the Intercooler cool.
If XRT had to tune, we would run 18-20psi in the sweet spot and taper down to an efficient boost of 15-16psi at 5600rpm and obviously lower to rev limit.
A good stock upgrade for the Subaru ascent and possibly for the Outback and the Legacy when it comes out with the FA24DIT is the Garrett GTX2860R. It will operate well within the shift points of the CVT transmission.
Reference data taken from – http://xtremeracingtuning.com/2019/10/26/xrt-subaru-fa24dit-tuning/
Please see a similar car we worked on that have a similar setup and Subaru mythology – http://www.xtremeracingtuning.com/forum/viewtopic.php?f=114&t=468
Update Dec 21, 2019
Update Dec 24, 2019
Mapping XRT Stage 1 Tuning over the equivalent turbo compressor map – GT2860R (A/R 60)
XRT started R&D Tuning on the 2020 Subaru Ascent on October 22nd, 2019 with a number of Subaru Ascent owners as part of an online group to keep communications and developments consistent and communicative. In addition, a FB group was created to represent our desires to highlight from a tuning perspective (like what we always do on our forum) the capabilities of the engine and general tuning issues. https://www.facebook.com/groups/subarufa24tuning/
To show our willingness and collaboration in the development of tunes for such models/engine, I reached out to Cobb Tuning as a Cobb Protuner to Alpha/Beta test any new products, as we have already started.
Please see below our minor tuning results for a current vehicle we are working on, before we encourage other to spend money to attain the necessary tools in tuning. As you will see below with the current engine configuration of Cams, heads etc, this engine will be nice for boosted models to raise the level of performance, once twin-scroll turbos are developed, due to the small engine size. It seems way more efficient than the EJ257 and somewhat on par with the EJ207. From discussions online, it really does seem like a over bored FA20.
I do not see the FA24F used in the STI, but a variant of it like all highlight turbocharged models for the STI. But we will see over time. I myself would love one to go into my GC8 utilising the Syvecs S7Plus.
Update: November 11, 2019
The boost of the Subaru Ascent cannot be adjust. The system is of mechanical type with a electronic feature to switch the boost off or on for Limp mode purpose. This is why the boost curve appear as it is below, which does not represent the wastegate duty cycle operations to bring the boost under control when reviewed.
Tyres: 225/40 R18
Car Weight: 1606kg
Driver Weight: 84kg
Total Weight: 1690kg
- Raptor Supercharger
- Raptor Headers
- Custom Exhaust
- XRT SC Tuning
- XRT XTMP v2
XRT offers tuning for the 2010+ Subaru NA models using the CVT Transmission and all 2015+ Subaru’s utilising special software that better support these models. The following tools are needed beside a windows Laptop/Notebook: