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Discussion Starter #1 (Edited)
Here are actual Skyactiv X (SPCCI) 'HF' Engine Details from Mazda for EU/UK markets.
Due for release in the next few months ONLY for all new BP Mazda 3.

Only in 2.0 Litre Engine capacity and YES it uses SPECIFIC NGK Spark Plugs that get replaced every 75K Miles or 120K kilometres.... Genuine Mazda Part Number HF01-18-110.

Engine Oil 0W20.
Fuel ONLY use 95 RON/ROZ

Anyway here is some cherry picked Official Mazda Service Information you may find interesting...

Spark Plugs for SKYACTIV-X (HF)
Always make sure to use the designated genuine spark plugs (HF01-18110 (NGK)) for Spark Controlled Compression Ignition (SPCCI) at SKYACTIV-X Engine.
It is also very important to align the direction of electrode on all spark plugs in proper angle, otherwise, the drivability and fuel efficiency may get worse.
In order to align the electrode angle, always make sure
1) NOT to use any other spark plug than the designated one as it may have different electrode angle.
2) To tighten the spark plug with proper torque (to align the electrode angle)
Please refer to the Workshop Manual for further procedures such as the proper torque

Fuel.
All the hardware & software of SKYACTIV-X is precisely tuned for maximum performance with “designated fuel”. For UK/Europe, designated fuel for SKYACTIV-X Engine is 95RON/ROZ.
Always make sure to use designated fuel shown on a label on the fuel-lid.


Engine Oil for SKYACTIV-X (HF)
Mazda Original Oil 0W-20 (Upgraded to SN Plus/GF-6 equivalent) to be prepared to make the best fit to SKYACTIV-X (HF), then always make sure to use SN or SN Plus for SKYACTIV-X (HF) to have the best performance such as fuel efficiency.

Automatic Transmission Fluid (ATF) for SKYACTIV-X (HF)
Always make sure to use “ATF A7” for SKYACTIV-X (HF) Automatic Transaxle (ATX).
If any ATF other than “ATF A7” is used, MC cannot guarantee the performance or reliability.

Consequently, any malfunction of the above ATX units caused by usage of ATF other than A7 cannot be covered by warranty.

“ATF A7” is further low viscosity formulation and low friction than “ATF FZ”, in order to achieve best-in-class fuel mileage.
Due to this, do NOT use “ATF A7” for ATX other than SKYACTIV-X (HF) ATX, otherwise it could cause serious trouble on the ATX. No interchangeability with “ATF FZ”, either.

Brake Fluid of Mild Hybrid model only for applicable markets
Always make sure to use the Brake Fluids listed below for Brake by Wire (Electronically controlled brake unit) equipped for Mild Hybrid models. This is to prevent damages on rubber parts.
B060/BF25 DOT3 (CCI)
Safe Brake 16M/9M DOT4 (Clariant)
Hydraulan 404 DOT4 (BASF)
TOTAL HBF4 OEM+
Applying general standards such as FMVSS, DOT3/DOT4 is NOT sufficient to use.

Air contamination and the removal on Brake by Wire in Mild Hybrid model.
Air contamination in Brake by Wire model cannot be confirmed by stepping on the brake pedal as like conventional brake.
Always make sure to use Mazda-Modular Diagnostic System (M-MDS) to confirm the Air contamination.
Also always make sure to take the way as shown below when Air removal in Brake by Wire to avoid warning (Diagnostic Trouble Code) by mis-judgement of brake fluid leakage in the system.
Ignition On, and turn to air-removal mode by M-MDS, then operate the brake.
Please refer to the Workshop Manual for further details on Air contamination and the removal.

Tires
Following SKYACTIV-VEHICLE ARCHITECTURE concept, all components (Original Equipped tires, suspension, body and seat) are designed and developed altogether and highly balanced for the best driving performance of Mazda Branded Value. Please note that handling of the replacement tires is same as before.
Different Tire (PROXES R51 & R51A) cannot be mix-used in one vehicle even in the same supplier of TOYO.

Special Service Tools (SST) & Equipment
New SST has been established, 5 items for SKYACTIV-X(HF), 4 items for body & chassis of New Mazda 3. 
Also, we have informed the required Equipment for technical service.
1) The SST of Engine Cradle Set is necessary to avoid a damage of Plastic Oil Pan used in SKYACTIV-X, which is used with the engine lifter in combination (generally available equipment, please check the required dimensions in the Service Information).
This may be required for the upcoming new engines and EV battery pack in new models near future.
2) New refrigerant (HFO-1234yf) Air Conditioning Machine, please introduce it after checking the regulation if the applicable model to be sold in your market, and also confirm the label to identify if the new refrigerant is used on the vehicle.


Body & Paint Repair
Body repair
It is recommended to use the hemming tool (generally available tool), since the hemming structure for the rear fender arch part was adopted for New Mazda 3.
Paint repair
1) For Mild Hybrid model, if drying the paint with Li-Ion Battery Pack on-boarded, it is necessary to control the temperature so as not to become too hot at the body panel (less than 60 degrees centigrade).
2) The resin is adopted for fuel filler lid.
Please check with the paint manufacturer for the repair instruction.
3) New color 47C (Polymetal Gray metallic) will be adopted, but it is possible to paint as usual.

Mazda Global Service Support (MGSS Service Materials and Repair info.)
MGSS is newly developed as a global system that supports our dealers with servicing our customers’ vehicles. MGSS replaces the Mazda Electric Service Information (MESI), and it will be rolled out to markets to create a single, global information source.
MGSS provides Service materials and Service Information together based on keyword search function.
The MGSS homepage has been designed for the technician to access information easily and serves as a starting point for their workflow. They can quickly check new information that has been released.

Also, MGSS has interface to Mazda-Modular Diagnostic System (M-MDS) that enables technician to retrieve Vehicle Identification Number (VIN) and Diagnostic Trouble Code (DTC) directly shown on MGSS screen.
The MAZDA DEALER technician is able to quickly look through information relating to the DTCs stored in the vehicle. MGSS will be integrated as the service portal for users to conduct service support in the future.
Pay To View restricted access for Independent Operators will also be re-introduced in the near future.

Diagnostic Software (MDARS).
New “Mazda Diagnostic and Repair Software (MDARS)” will launch on M-MDS in time with New Mazda 3 (BP) introduction. MDARS can be used with all of current M-MDS hardware.
MDARS has the following features:
1) MDARS and MGSS to be single sign-on. User can easily access both MDARS and MGSS.
2) Single screen with color coded Electric Control Unit (ECU) for whole vehicle as the over view of a vehicle situation.
3) Diagnostic & Repair history data can be quickly/easily shared for support.
Please note that adequate access control is required for data protection and/or law.
To precisely diagnose and repair New Mazda 3 (BP), usage situation of diagnostic tester will increase with more maintenance service functions, more complicated vehicle electrical system diagnostic and increase of reprogramming ECUs and more. Thus, please consider to deploy your additional VCM-II.

Blank Electric Control Unit (ECU)
From the New Mazda 3 (BP), service parts of ECU's with “Blank ECU” will be increased. “Blank ECU” needs to be programmed by M-MDS. Therefore, with this “Blank ECU”, variations of ECU service parts will be decreased to support more lean parts stock. However, the appropriate parts stock in each market will be necessary in order to
minimize the order lead time and spare parts stock holdings.
Please check Electric Parts Catalogue (EPC) with identification of “Blank” for correct ECU stock consideration.

Continued...
 

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Discussion Starter #2 (Edited)
Condition Based Maintenance (except for the markets My Mazda service was already introduced)
Depending on customer’s operation, the vehicle will judge the maintenance (Oil Change) timing.
Customer can feel secure by knowing necessary items & timing based on vehicle condition.
1) This function’s default setting is “ON” and it is impossible to be “OFF”.
2) Wrench Indicator Light to be ON &/or displaying a message in instrument panel at 1,000 km or 15 days, whichever comes first, prior to the oil change due and within upper limit which is defined by country such as 20,000km/12 Months, 15,000km/12 Months, or 10,000km/6 Months.
3) Distance till the oil change can be checked in the Mazda Connect display.
4) It is necessary to reset the engine oil data whenever replacing the engine oil regardless of the message/Wrench Indicator Light display. Reset operation can be performed in the Mazda Connect display. Please refer to the Owner’s Manual for the further procedures.

Change Point of Maintenance Table

Caution for Service Package Program: Choice of Times base or Period/Mileage with the appropriate package pricing due to deviation of service times is necessary (vs. Period/Mileage with the fixed service times).

In-Vehicle Digital Owner’s Manual (OM) only for applicable markets
In-vehicle digital OM is launched for New Mazda3 (BP) first to improve usability of OM and also accessibility of OM information. The in-vehicle digital OM can be displayed on the center display while the vehicle is stopped, and customer can search descriptions and watch videos of vehicle features and functions by operating the commander switch.
1) Printed OM is continued and the in-vehicle digital OM is not intended as a replacement of the OM.
2) The in-vehicle digital OM data needs to be installed into vehicle (Connectivity Master Unit: CMU) at port or dealer by using USB memory, and the data can be downloaded.
Time of the initial installation procedure is approximately 3 minutes per vehicle.
Furthermore, OM data installation needs to be performed when CMU part is replaced with new one.
3) OM data package can contain multiple languages and required language packages.
Available languages are: English, Dutch, Spanish, German, French.

Emergency Call System (e-Call) for EU markets
e-Call became a safety equipment for new models to be launched from April 2018 onward.
The major component of the system “Telematics Communication Unit (TCU)” has an embedded SIM, which is automatically enabled 2 months after shipment from the SIM supplier and valid for 11 years.
1) When the battery (12V) does not supply TCU with power, the built-in battery of 9V in TCU supplies the power as the backup.
An unused built-in battery lasts for at least 3 years to assure the proper functions (10min call or 60 min stand-by). When the built-in battery remaining power reaches its limit (5.5V) for replacement, the Red indicator light comes on. It should be replaced at Mazda authorized dealer according to the replacing procedure in the Workshop Manual.
2) The Red indicator light also illuminates when the system has a malfunction as like Malfunction Indicator Light (MIL). So, it is strongly recommended to check the status of the Red indicator light when performing scheduled maintenance as usual.
3) Apart from SIM validity, the system must be enabled by performing finalization (switching from Factory mode to Market mode) before the new vehicle delivery. This finalization is also necessary when replacing TCU with a new service part. Please refer to the Workshop Manual for the detailed repair procedure.

Engine Cover for SKYACTIV-X (HF)
SKYACTIV-X (HF) has its own engine cover and always make sure to close this cover prior to closing the Hood/Bonnet, and do not spray water in the engine compartment, however, if washing the engine compartment is inevitable, always make sure to close this cover to prevent the electrical devices from suffering water damage.

Engine Coolant replacement for SKYACTIV-X (HF).
SKYACTIV-X (HF) has two routes of the engine cooling system to cover the Exhaust Gas Recirculation (EGR) cooler, which may cause a difficulty of Air drainage during Engine Coolant replacement.
Always make sure to implement the Air drainage process according to the Workshop Manual after Engine Coolant replacement, otherwise the warning light ON to the safety mode (power constraint) may occur during high speed driving.

Replacement of New Wiper system.
Always make sure to implement the position learning to A-pillar by Mazda-Modular Diagnostic System (M-MDS) whenever replacement of Front Wiper at Driver side, Wiper Unit, or Wiper Link to keep the sufficient front viewing area at rain.
Please refer to the Workshop Manual for the detailed procedures.

Operation of New Wiper system.
When raising the wiper arms/blades OFF Windscreen, always make sure to move the arms to the SERVICE POSITION according to the procedures, using the Wiper Switch Lever shown in the Workshop Manual/Owner’s Manual.
If manually move and raise the wiper arms from the initial position under the cowl, the wiper system will not be functional, or may interfere with the Hood &/or A-pillar.
Also, always make sure not to operate the wiper arms by the Wiper Switch while raising the wiper arms, otherwise they may interfere with the Hood/Bonnet, resulting in scratches &/or deformation or damage.

Replacement of Power Seat system.
Always make sure to implement the position learning to Seat End by Mazda-Modular Diagnostic System (M-MDS) whenever replacement of Seat Assembly itself, or Seat Electric Control Unit to keep the original settings.

E&OE.
 

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Or it was supposed to. Very odd. Hoping that the improved MPG warrants the cost of 95 RON/ROZ.
These details are for the EU/UK version. 95 RON/ROZ (a.k.a. EURO 95) is the lowest octane available here. This probably explains the specification and for other markets it might be specified lower.

Andy
 

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These details are for the EU/UK version. 95 RON/ROZ (a.k.a. EURO 95) is the lowest octane available here. This probably explains the specification and for other markets it might be specified lower.

Andy
The UK motoring press e.g. Honest John often recommend the use of 99 RON fuel for improved economy and performance despite the additional cost. That hasn't been my experience with the outgoing Mazda 3 and I wonder why 99 RON fuel isn't mentioned for the Skyactiv X.

I haven't come across brake by wire before. Is this to save money or another reason? Let's hope it's as reliable as a hydraulic system when needed.
 

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These details are for the EU/UK version. 95 RON/ROZ (a.k.a. EURO 95) is the lowest octane available here. This probably explains the specification and for other markets it might be specified lower.

Andy

Thanks. That make sense and hopefully the Sky-X shows improvement in both MPG and performance.
 

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It's not designed for performance.. they aren't even calling it a supercharger and the spark ignition is neat..but not gonna do much in terms of speed.
CK
 

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Thanks for posting.
It would be nice if Mazda put some numbers on the y axis , and made it more relevant by comparing it to the 2.5 engine actually used in the U.S. I am assuming the x here is the 2 liter, if its the 2.5, then I am impressed.

Why does x develope less torque at 2000 rpm on 95 ron as opposed to 91?
 

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I haven't come across brake by wire before. Is this to save money or another reason? Let's hope it's as reliable as a hydraulic system when needed.
Brake-by-wire is similar to drive-by-wire where the cable actuation has been removed. The electronics is only between the pedal and the brake actuator unit. The brake system still has a master cylinder, hydraulic lines, etc.
 

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Brake-by-wire is similar to drive-by-wire where the cable actuation has been removed. The electronics is only between the pedal and the brake actuator unit. The brake system still has a master cylinder, hydraulic lines, etc.
How do you 'feel' what the brakes are doing when there is nor back pressure which you sense using hydraulic brakes?
 

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Based on the original post, I assume the engine has been further optimized for 95RON - at least for the initial EU market release. This presentation slide is from last year IIRC.
The minimum fuel standard in the UK is 95 RON so the Skyactiv X appears advantageous especially for lower rpm torque where most normal driving is done. Is there a torque curve for 99 RON petrol?
 

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This may be required for the upcoming new engines and EV battery pack in new models near future.
New hybrid or EV confirmed?

Anyway, what about this new diagnostic software? Is it to shut out 3rd party repair? Seems so sketchy to me, like the insults that Apple does.
 

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This graph with no Y axis numbers is totally misleading. Makes it appear that the x engine makes about 80% more torque than the mzr.
In reality
2.0 MZR 141 ft lbs @ 4500rpm
2.0 S.A.G 148 @ 4600
2.0 S.A.X 163 @?
2.5 S.A.G 186 @ 3250
Yeah, spot on. Seems like the Y axis doesn't start from 0. Deliberately misleading. The difference is what, 224Nm vs. 213Nm for the currently available G122 (in EU). A whooping +11Nm. :D
 
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