Author Archives: west_minist

Subaru Ascent Tuning

XRT is the only Tuning company beside Cobb Tuning to demonstrate it tuning capabilities and the release of tuning information to the World before any other tuning companies. In fact, tuning companies requires Cobb Tuning to support these models. XRT done!

Please also note XRT is a Cobb Protuner and we support tuning of the Subaru Ascent using the Cobb Accessport.

In respect to our research and development (as shown at the very below) on the Subaru Ascent & the FA24DIT operating in this vehicle, we are offering Stage 0 and 1 tuning support to owners with the following requirements:

  • Tuning that does not require a device to be installed in the car
  • Improve driveability with clear objectivity in engine response
  • Improve Fuel Mileage
  • Reduce throttle lag
  • Better sounding throaty engine
  • A little more pep (Stage 1)
  • Improve CVT Operations

The tuning is really considered for those not liking the small little issues as highlighted in our XRT Subaru Ascent Whatsapp group – https://chat.whatsapp.com/E1dPtXGgn3oEJAEm6P3aeU

http://xtremeracingtuning.com/2019/10/26/xrt-subaru-fa24dit-tuning/
http://xtremeracingtuning.com/2019/10/26/subaru-fa24dit-turbo-mgt22/

Videos
ttps://youtu.be/EoXe2WxpI-Q
https://youtu.be/zJ_G6SRK93M
https://youtu.be/oh5fojSEWUA
https://youtu.be/HhU6eCFyqMY

Research
https://www.ascentforums.com/threads/xrt-subaru-ascent-tuning-stage-1.8915/#post-120707
https://www.ascentforums.com/threads/xrt-subaru-ascent-tuning-stage-1.8915/post-120957

Customer Reviews
https://www.ascentforums.com/threads/xrt-subaru-ascent-tuning-stage-1.8915/#post-120957
https://www.facebook.com/XtremeRacingTuning/posts/1715937071877146

Stage 1 Development Tuned

Stock
Stock Drag Data

Subaru FA24DIT Turbo: MGT22

The Subaru FA24DIT MGT22 Turbo is equivalent to the Garrett GT2259 Turbo and compressor graph possibly looking 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).

The Garrett representation could be off a little for the compressor being used and it is very possible the shape of the graph will be different and extend a little more to the right. Based on Subaru data and engine flow data, 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, I would expect the MGT22 could flow up to 32lbmin 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 16psi of boost at 5600rpm. That will net 320chp or around 270whp. 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

XRT Subaru FA24DIT Tuning

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.

RonS – 2011 ADM Subaru Forester S-edition 5EAT

Info
Owner: RonS
Rom ID: AZ1J500V
Tyres: 225/55-17
Car Weight: 1540kg
Driver Weight: 105kg
Total Weight: 1645kg

Mods
XRT XTMP
XRT Stage 2

IHI VF52
Process West Verticooler
X-force turbo back exhaust (awaiting install)
Adjustable GFB deceptor Pro II BOV
Process West Cold Air Intake w/K&N Filter (WRX/STi 2008-14) (PWCAI04)
Grimmspeed EBCS

http://www.xtremeracingtuning.com/forum/viewtopic.php?f=140&t=810
https://www.facebook.com/XtremeRacingTuning/posts/1302594823211375

SteffenV – Cobb Remote Tuning 2007 USDM Subaru 2.5 OBXT 5MT

Info
Owner: SteffenV
Version: Cobb v2
Tyres: 255/40/18
Car Weight: 1588kg
Driver Weight: 190kg
Total Weight: 1778kg

Altitude: 1539m

Im not really sure where to begin as everything about Ed and my tuning experience with XRT has been nothing short of…

Posted by Steffen Veum on Sunday, August 26, 2018

Mods
Cobb V3 Accessport
XRT Stage 3 Full Speed Density Cobb Tuning

Custom NVS rotated turbo kit.
3in Custom NVS down pipe and cat back to Stromung Y pipe and Quad tip mufflers
Garrett GTX3076R Gen I W/ Tial .63AR Hot side, 4in Anti Surge inlet
4in custom NVS intake with K&N air filter
Custom NVS up pipe
Perrin 3.5in front mount intercooler
PTP Turbo blanket and titanium heat wrapped up and down pipes
Stock exhaust manifold
44mm Tial external waste gate plummed back to exhaust.

EJ257 case halves
Cosworth Stock bore pistons 9.5:1
Manley rods
King rod and main bearings
Killer Bee oil pickup tube and oil baffle
11mm high flow STI oil pump

Stock 2007 OBXT cylinder heads and camshafts
Supertech Sodium Filled Inconel exhaust valves (stock size)
Supertech stainless intake valves (stock size)
Supertech Titanium dual valve springs, seats, and retainers.
Cometic .040mm thickness head gaskets
ARP 625+ headstuds

STI rotated intake manifold
Grimmspeed 3 port EBCS
Stock Map sensor
JDM TGV deletes
Tial vent to atmosphere BOV
IAG Competition AOS

DW300 Fuel pump Hardwired to battery
Stock topfeed fuel rails and FPR
ID1300X fuel injectors
Parallel routed fuel lines
Full E85

Koyo Radiator and cap
Perrin overflow tank
Optima Red top battery
SPT oil cap and battery tie down

AEM UEGO AFR gauge mounted in AVO dash pod

2006 USDM Spec B full interior swap
2010 LGT rear view mirror

LGT suspension with rear upper and lower control arms
All subframe and rear cradle spacers removed.

2004 Subaru STI Brembo front brake calipers
DBA 4000 T slotted STI front brake rotors.
Stainless steel front and rear brake lines

18X8.5 +44 SSR GTX01 wheels
SSR Aluminum lug nuts
255/40/18 Bridgestone Potenza RE760 tires

 

v12 3rd Gear Dyno SAE @ 26psi.png

MarekK – 2004 EDM Forester 2.5XT 5MT

Info
Owner: MarekK
Rom ID: A2WC420F
Tyres: 225/55r17
Car Weight: 1500kg
Driver Weight: 82kg
Total Weight: 1582kg

Marek Kwas It been an interesting year where we have seen a good few Foresters in a modded state coming to us. Here is a…

Posted by Xtreme Racing Tuning on Thursday, July 26, 2018

Mods
XRT XTMP
XRT Stage 2

– decat uppipe
– 3″ downpipe with sports cat
– 3″ straight through exhaust with Fujitsubo RM01A muffler
– Pre97 GC8 WRX/STI TD05H-16g turbo with stock wastegate
– 550CC stock injectors, yellow, side feed
– Deatschwerks DW200 fuel pump
– STI Intercooler with Forge BOV
– Cobb 3-port boost controller

What has been checked:
– valve clearance
– compression
– new plugs (NGK ILFR6B, 0.8mm gap)
– new oil
– intake leak test

Other interesting stuff 😉
– STI hood scoop with STI air splitter
– Cusco Zero 2 suspension with pillowball mouns and camber plates
– STI calipers both front and rear, DBA T2 brake discs with CL5+ pads front, DBA Street Series with DS2500 pads rear
– Rear STI sway bar
– Titanium STI front strut bar
– Rays Gram Lights 57S 17′ wheels

StephenC 2008 USDM Subaru Legacy LGT 2.5 5EAT Tuned for Response

Mods


Cobb AP Stg2 replaced by XRT ECU Stage 2 Tuning
XRT 5EAT Tuning
XRT XTMP

Tomei Equal length header, Tomei Up-pipe
VF52 turbo, mild porting of exhaust
Grimmspeed EBCS
Turbosmart compact recirculating BPV (not a mod really but…)
Cobb Catted DP, stock mid, STI mufflers
AVO TMIC
Stock airbox and air filter

Reviews:-

Cobb AP Pro Tune & XRT: The Differences

http://www.xtremeracingtuning.com/forum/viewtopic.php?f=115&t=770#p2391

OK we are close this one was good!

Town driving–Throttle response is still nice and strong-nothing changed there and that is good. A little jumpy in S# at ~25% throttle around 3K in 2nd and 3rd BUT** it’s very responsive to input and i don’t have the most steady foot on bumpy roads:-) doesn’t do it in S mode so yeah…my foot lol!

3rd gear pull– Only 1 single instance (single cell) of ping (-1.5) right before peak boost. a few -1.5 cells as I lifted off throttle at 6000rpm. Feels Strong.

How it feels on the 3rd gear pull–pulls harder as the boost spools up–perfect!. It feels like it hits a shot of Nitrous about 4600RPM as it transitions from 8.5degrees to 10.5degrees of timing. It’s subtle, not a surge, but I thought I’d point that out.

Roll on acceleration about 3000rpm—amazing in all gears. I don’t really feel that transition in this circumstance.

2nd gear is just nuts. I never really tried it before at WOT. SO yeah, nice one!

Shifting–under load, nice and sharp and quick. I don’t know if it’s possible to tune this—-> but it would be nice for the trans to respond faster to paddle inputs, especially at light load around town. No big deal though;-)

Alright, well where do I start? As we are getting close to the end of the tuning process I’m thoroughly impressed. Ed’s knowledge and feedback to my queries has been fantastic. He’s quick to respond and I challenge any tuner to provide such good customer support! Feedback is nearly immediate and revisions come daily (sometimes more often!).

I urge any Cobb tuned customer to consider XRT. If you have an 5EAT or if you are Cobb tuned on Canadian petrol, you need to contact XRT tomorrow!!

My Cobb stage 2 provided predictable, modest power improvements as advertised from Cobb. However, as predicted, the pinging (feedback knock, fine knock learning) was endemic, over all grades of petrol. Only after a couple revisions he had the power far above Cobb’s tune, and a transmission that provides strong, fast shifts. We are onto Rev 5, and the power keeps building and I’m getting zero pinging under all conditions, on standard Canadian 91 petrol! And the shifting and throttle response are unreal. Night and day over an Off The Shelf tune…. BRAVO Edward!!!!