Found an explanation for the cold start noise: How Mazda's Skyactiv Fuel-Efficiency Technology Works | Vehicles & Technology content from WardsAuto
In summary, since mahaba ang headers malayo na ang cat converter. Kelangan painitin ang cat converter para maging effective. On cold start very delayed ang ignition timing para mainit ang exhaust to heat up the converter. Once mainit na (15 secs or so daw) back to normal ops na.
Mazda uses direct injection to very carefully tailor combustion conditions at cold start to get essentially a stratified charge that is easy to ignite. The rich mixture adjacent to the spark plug gets started, and the ball of burning fuel ignites the lean mixture, Coleman says.
That stratified charge is possible thanks to very fast DI that can inject a little fuel during the intake stroke, then a bit more during the compression stroke, to enable very stable combustion, which in turn allows very delayed ignition timing during cold start.
“The later we ignite the fuel, the later it continues burning and the hotter it is going out the exhaust. So we're running very retarded ignition timing during the first 15 seconds or so to create more heat to light off that catalyst and get it up to temperature," Coleman says.
Mga sir, question naman:
1) Ano ang silbi nung open-trunk sa susi ng Mazda 3 (1.5 sedan)
2) Dun sa kumuha ng leather seats, maganda ba pagkakagawa?
3) Ano ang silbi ng wifi sa infotainment system?
Parang nag-expect ako na mas fuel efficient sa 10km/L (combined city and hiway driving) yung mazda 3 ko, pero yun lang nakuha ko. any tips naman pano maiimprove?
Salamat!
1) Ano ang silbi nung open-trunk sa susi ng Mazda 3 (1.5 sedan)
--Maglalagay ka lang ng grocery or may kukunin ka lang sa trunk without unlocking the doors.
3) Ano ang silbi ng wifi sa infotainment system?
--Pwede daw magrun ng something similar to Spotify. Sa US may gumagamit neto para ma-hack ang system. Tatanggalin din daw sa future HU firmware update.
Parang nag-expect ako na mas fuel efficient sa 10km/L (combined city and hiway driving) yung mazda 3 ko, pero yun lang nakuha ko. any tips naman pano maiimprove?
--Avoid traffic. Yun lang talaga ang best solution. Impossible within Metro Manila during holiday season.
Salamat sir! Yung sa 1 kasi kahit anong pindot gawin ko dun sa button, hindi nag-unlock yung trunk, kaya ko natanong. Ako lang ba nakaexperience nito?
Gusto ko nga sana magrun ng spotify kaso di ko alam pano. Yung spotify ko lagi lang sa phone nagrarun eh hassle pag nagpopause, kailangan ko pa buksan ulit phone ko para iplay ulit yung playlist.
Nanggaling kasi ako sa 1.3L na kotse na inaabot ako ng mga 13km/L same route hehe. Pero something's gotta give nga naman. Enjoy naman ako ng sobra sa Mazda 3 ko.
Wifi can be used with gps navigation when you're surronded with high building structures that the gps position won't work properly or no signal at all. Problem is we didn't have this features yet for phil.
May fc for 95pct city driving run 211kms, ave. Spd 12kph are 6.5km/l, calculated by full tank method.
Finally got my leather seats from Seatmate. Total spent was 7000 instead of 6500. Bweset yung guard nila pinacounterflow ako sa kalsada kala ko kaclose na niya yung traffic enforcers, naticket tuloy ako dagdag hassle pa and violation charge. I would not recommend having the seat covers installed in Pasay, sa main branch nalang kayo. Pushing that aside, maganda ang gawa nila. the texture is smoother than genuine leather, and is probably comfier since may thin padding pa siya. Another good thing is that the perforated seat covers are actually better here since faux perforated pattern lang siya instead of actual holes. The CX-5 I saw in display in Q.Ave when I was doing my first month PMS was already showing signs of the disadvantages of actual perforated leather. Lumilitaw na yung fabric sa ilalim through the holes, definitely a turn-off.
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Last edited by Louie Anson Ng; December 6th, 2014 at 10:48 PM.