Author Topic: My FC Getting Better With Low RPM  (Read 98866 times)

Offline SoL

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Re: My FC Getting Better With Low RPM
« Reply #80 on: November 19, 2008, 09:10:53 AM »
400km at half tank mark and you get only 17km/l? Weird, I get 19km/l but around 300km at half tank mark. You took the picture on upslope is it?  :confused1:

On a side note, cars generally consume lesser petrol in N then in D when at a stop, but I can't confirm that for latios. I do that though.

Offline liewks

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Re: My FC Getting Better With Low RPM
« Reply #81 on: November 19, 2008, 09:57:32 AM »
On a side note, cars generally consume lesser petrol in N then in D when at a stop, but I can't confirm that for latios. I do that though.

I agree. Verified on a SGP Jazz and a NAM Nissan Altima 2.4L with a Scangauge. I suppose the Latio will behave similarly. Too bad our Latio does not support Scangauge :-(.

There's an interesting footnote to this, the Altima consumed less petrol when stopped in D than in N when it was still in warm-up mode. Maybe this has something to do with keeping the revs down when the engine is in open loop. But once the engine is nice and warm, the reverse is true.

I like to keep the gear shift at N when stopped. It saves a tiny bit of fuel, avoids heating up the torque converter and makes my little car feel like it has a V6 at idle... (i.e. hardly any vibration). Actually, I often switch off the engine at those stop lights that stay red for over 20s.

Another thing about higher tyre pressures. There seems to be an point of view going round that it is dangerous to use higher pressures on long highway drives because the tyre will overheat. However, the tyre with higher pressure has two things in its favour:

- it will suffer less deformation as it rotates at speed, and,
- it will possess lower rolling resistance

and therefore should heat up less than an underinflated tyre. Underinflation is far more dangerous at sustained highway speeds than mild overinflation (within sidewall limits). Higher pressures tend to lower the effort required to turn the tyres and results in somewhat lighter steering, which we may mistake for severely reduced grip.
« Last Edit: November 19, 2008, 02:04:45 PM by liewks »

Offline liewks

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Re: My FC Getting Better With Low RPM
« Reply #82 on: November 19, 2008, 02:09:52 PM »
400km at half tank mark and you get only 17km/l? Weird, I get 19km/l but around 300km at half tank mark. You took the picture on upslope is it?  :confused1:

My observations are similar to SoL. About 320km~340km at 1/2 tank indicates a high chance of a 19+km/L tank (~570km @ 1/4 tank mark). Getting 400km @ 1/2 tank will mean an excellent chance of a 22+km/L tank (~660km @ 1/4 tank) if traffic conditions stay the same throughout the tank. Unfortunately, I haven't seen 20+km/L tanks for some time now.
« Last Edit: November 21, 2008, 10:58:12 PM by liewks »

Offline fri13th

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Re: My FC Getting Better With Low RPM
« Reply #83 on: November 19, 2008, 09:09:37 PM »
No leh i never park at slope leh i come to 17km/l cos the last half tank was 368km and untill light came on is 636km and i pump in 37.5 litres so about 17km/l lor unless my formula for fc calculation is wrong or maybe my tank different shape with u guys? :blink:

Offline Latiorarri

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Re: My FC Getting Better With Low RPM
« Reply #84 on: November 20, 2008, 09:07:21 AM »
I agree. Verified on a SGP Jazz and a NAM Nissan Altima 2.4L with a Scangauge. I suppose the Latio will behave similarly. Too bad our Latio does not support Scangauge :-(.

There's an interesting footnote to this, the Altima consumed less petrol when stopped in D than in N when it was still in warm-up mode. Maybe this has something to do with keeping the revs down when the engine is in open loop. But once the engine is nice and warm, the reverse is true.

I like to keep the gear shift at N when stopped. It saves a tiny bit of fuel, avoids heating up the torque converter and makes my little car feel like it has a V6 at idle... (i.e. hardly any vibration). Actually, I often switch off the engine at those stop lights that stay red for over 20s.

Another thing about higher tyre pressures. There seems to be an point of view going round that it is dangerous to use higher pressures on long highway drives because the tyre will overheat. However, the tyre with higher pressure has two things in its favour:

- it will suffer less deformation as it rotates at speed, and,
- it will possess lower rolling resistance

and therefore should heat up less than an underinflated tyre. Underinflation is far more dangerous at sustained highway speeds than mild overinflation (within sidewall limits). Higher pressures tend to lower the effort required to turn the tyres and results in somewhat lighter steering, which we may mistake for severely reduced grip.

Scanguage II can?

http://www.scangauge.com/

Offline LatioR

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Re: My FC Getting Better With Low RPM
« Reply #85 on: November 20, 2008, 09:10:43 AM »
hi bro fri13th, liewks, Sol, seem like all of u top up petrol to full after light up. Think of trying up to top up to only 1/2 tank and to monitor for few top ups and calculate total amt of petrol topped up & distance travelled. I believed it's will be a great help in FC but it's mean that I can't go to JB every wkends to pump cheaper petrol liao...

Offline SoL

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Re: My FC Getting Better With Low RPM
« Reply #86 on: November 20, 2008, 11:34:19 AM »
Wow liewks, can't believe there's a pro hypermiler in TLC, getting 20km/l tanks!

I have much to learn! ;D

Offline totallypatrick

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Re: My FC Getting Better With Low RPM
« Reply #87 on: November 20, 2008, 11:47:49 AM »
How u guys can achieve such amazing fc man? Won't the car be very slow if it's lower rpm all the way?

Offline iagree

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Re: My FC Getting Better With Low RPM
« Reply #88 on: November 20, 2008, 11:50:55 AM »
How u guys can achieve such amazing fc man? Won't the car be very slow if it's lower rpm all the way?

hi totallypatrick

saw ur white latio. what happen to the front part? the side like kena kissed before?
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Offline SoL

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Re: My FC Getting Better With Low RPM
« Reply #89 on: November 20, 2008, 11:53:48 AM »
How u guys can achieve such amazing fc man? Won't the car be very slow if it's lower rpm all the way?

Not really. Its a misconception that stepping very lightly on accelerator is good for FC. In fact, moderate is the best. Engine works best at wide open throttle.

So maintaining around 2k for acceleration is best. After that cruise at around 80-85 should be ok. Anymore higher and the higher constant rpm and large wind resistance is terrible for FC.

Offline MadMatty

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Re: My FC Getting Better With Low RPM
« Reply #90 on: November 21, 2008, 08:24:12 PM »
My observations are similar to SoL. About 320km~240km at 1/2 tank indicates a high chance of a 19+km/L tank (~570km @ 1/4 tank mark). Getting 400km @ 1/2 tank will mean an excellent chance of a 22+km/L tank (~660km @ 1/4 tank) if traffic conditions stay the same throughout the tank. Unfortunately, I haven't seen 20+km/L tanks for some time now.

I have never achieved anything above 230km for half way mark and my best FC till date is 11.5km/ltr...but now a days seems to be worse dropping to 10.5km/ltr or less...car only 6500km traveled...told the SA my problem but of course hear the usual crap of driving pattern blah blah blah.... :mad: :mad: :mad:

Offline Silver

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Re: My FC Getting Better With Low RPM
« Reply #91 on: November 21, 2008, 09:10:23 PM »
what are your "cold" tyre pressures?
Be safe. Go with the flo.

Offline iagree

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Re: My FC Getting Better With Low RPM
« Reply #92 on: November 21, 2008, 10:17:27 PM »
what are your "cold" tyre pressures?

hi silver,
how frequent do we need to chk our typr air ah?
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Offline Silver

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Re: My FC Getting Better With Low RPM
« Reply #93 on: November 21, 2008, 10:22:59 PM »
once in about two two weeks will do nicely

weekly if you are very "on"

try to make visual check of all 4 tyres everyday before starting journey - helps to spot punctures before having to make "expensive" replacements
Be safe. Go with the flo.

Offline iagree

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Re: My FC Getting Better With Low RPM
« Reply #94 on: November 21, 2008, 10:32:08 PM »
once in about two two weeks will do nicely

weekly if you are very "on"

try to make visual check of all 4 tyres everyday before starting journey - helps to spot punctures before having to make "expensive" replacements

hi silver

ohhh
ever since my last chg of all 4 tyres, i chk during my 30000 service at autosaver, til now abt 1mth liao, hvnt chk
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Offline liewks

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Re: My FC Getting Better With Low RPM
« Reply #95 on: November 21, 2008, 10:57:11 PM »
Unfortunately, I haven't been able to get it to work... It works great in the Jazz and you can read throttle position, battery voltage, engine load, FC, etc... Sigh, too bad for us. I have tried scrolling through many different settings to no avail. Perhaps a guru provide some advice?

Scanguage II can?

http://www.scangauge.com/


Offline liewks

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Re: My FC Getting Better With Low RPM
« Reply #96 on: November 21, 2008, 11:03:01 PM »
Wow liewks, can't believe there's a pro hypermiler in TLC, getting 20km/l tanks!

I have much to learn! ;D

Err, I don't think I'm "pro". There are several factors that weigh things in my favour:
- long continuous drive of 37km each way minimises warm up hit on FC
- having 65% ~ 75% highway commute
- the fact that I don't mind going a little slower

There are the lousy FC tanks too:
- 2 13.75km/L tanks
- 1 14.66km/L tank
- 1 14.74km/L tank

The guys from CleanMPG would probably be pulling over 25km/L if they had my car and route... I have no idea how that do that... Out of this world.
« Last Edit: November 21, 2008, 11:19:35 PM by liewks »

Offline liewks

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Re: My FC Getting Better With Low RPM
« Reply #97 on: November 21, 2008, 11:10:04 PM »
Not really. Its a misconception that stepping very lightly on accelerator is good for FC. In fact, moderate is the best. Engine works best at wide open throttle.

So maintaining around 2k for acceleration is best. After that cruise at around 80-85 should be ok. Anymore higher and the higher constant rpm and large wind resistance is terrible for FC.

While it is true that having a wide open throttle minimises throttle loss, there are other factors to consider. Throttle and RPM's are not necessarily directly related. Engine load can influence throttle position.

I am guilty of accelerating slowly. My aim to to spend as much time in the maximum gear ratio which loads the engine as much as possible at a given RPM. After a short blip to 1500rpm, I ease up on the throttle to get it down to 1200rpm. Wait for speed to hit 60km/hr and then there is a sort of ratio lock-up and I can accelerate the car from that point onwards in "top" gear.

If only we had a 5-MT Latio! More tricks to play with.

Offline SoL

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Re: My FC Getting Better With Low RPM
« Reply #98 on: November 22, 2008, 09:06:22 PM »
Yeah, a manual Latio for FAS!  ::)

Joking, fas in singapore can die. The traffic here is terrible, especially in rush hour. My heart pains everytime I go into CBD, thinking of all the fuel wasted/

Offline fri13th

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Re: My FC Getting Better With Low RPM
« Reply #99 on: November 24, 2008, 10:03:37 AM »
Hi everyone! today fuel tank lights went up and pump in 37litres of petrol milaege 664km :out:
Thats about 18km/l :yehyeh: really still getting better with each tank! :w00t: wondering when my good Fc will reach its limit :bleh: I think only time will tell ::)