Dec 5 2023, 11:24 AM
QUOTE(JON97 @ Dec 5 2023, 09:59 AM)
When it's cold, and you straight put it into D or R, the RPM straight drops, and where does the RPM go? Straight into the GB, causing a kickback.
If you noticed cold start RPM is always higher (Idle ~> 1k), Innova 2013 (4AT) is ~2k RPM, HRV 1.8 ~1.5k, Axia ~1.5k. and when you engage a gear, the RPM will drop almost instantly. It's not like the engine will slow down only your GB will engage.
Bro, I'm driving Axia E(yes its manual but same engine as the new Axia) , and i've never seen it gone up to 1.5K , the most is around 1000RPM, even when parked overnight in Genting. After fully warmed up it will drop to 750RPM (AC off, gear neutral). AC on is around 850RPM. If you noticed cold start RPM is always higher (Idle ~> 1k), Innova 2013 (4AT) is ~2k RPM, HRV 1.8 ~1.5k, Axia ~1.5k. and when you engage a gear, the RPM will drop almost instantly. It's not like the engine will slow down only your GB will engage.
As for the HRV 1.8L, it doesn't rev that high (up to 1.5K) in the morning.
About RPM drop instantly when engaging gear, its obvious bro- You are engaging the torque converter and/or wet clutch. It adds load to the engine for sure, and of course the ECU wont self speed up the engine. Hence thats why the RPM drops. Not the other way round.
With one exception: I've driven older Myvi 1.3 with 4AT and I hate them for one thing - They always rev up their engine 1-2 seconds when engaging into Drive or Reverse (or when the AC compressor kicks in), regardless engine warmed up or cold engine . If one doesn't step the foot brake it will lurch forward violently.
If you want to take care of your GB, simple: Dont drive like Michael Schumacher and frequently do "launch control" at red light, unless your GB has been modified and strengthen to take extra abuse. That little kickback at idle wont harm your GB la.
QUOTE(babisotong @ Dec 5 2023, 11:00 AM)
The reason RPM is higher ( COLD START ) because O2 sensor need to be warmed up to get good reading, if you read OBD data, it will say that it's not warm/operating temperature so it will use pre-set RPM/AFR by MANUFACTURE to help warm up O2 sensor, don't believe me? got buy O2 reader and get the reading yourself.
This I fully agree with you. I have OBD reader and yes, the engine will enrich the fuel mixture first until the O2 sensor is fully heated up. By that time the STFT goes as high as -10% 
This post has been edited by SleeplessEyes: Dec 5 2023, 11:36 AM
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