[Auto Talk] Can regularly shifting to Neutral on an automatic gear damage it?

[Adrian Wong]

Originally Posted by NeoSquall

always go down hill in gear.. let the help you brake.. haha.. safety feature.. so that ur brakes wont overheat.. its not sexy to have your brakes overheating.. its very very very scary... happened to me after a spirited run downhill.. braking distance doubled..

actually... is it true that when your foot is off the throttle and you are in gear going downhill and your car revs more than 3k RPM you are consuming more fuel compared to idling at low RPM? think about it.. your foot is off the throttle.. butterfly valve is closed.. little air is going thru your MAP sensor(if you have TPS.. then the butterfly valve will inform the ECU).. thus making the ECU think that you are in idle mode.. which means its the same as putting it to N..

sensible? if more fuel is going in.. dont you think you will go downhill faster because its the same as you stepping down on the throttle..?

man.. Im bad in explaning.. haha.. hope you guys understand..

Okay, so even if the engine revs go up while you are going downhill (without stepping on the pedal), it's actually idling and virtually in neutral?

Well, the pistons are still pumping. I'm just not sure if they are pumping air or actual combustion is taking place.

[Chai]

Originally Posted by Adrian Wong

Wah... What cars were those? And how much did it cost you?

Hmm.. My biggest worry going downhill for extended periods of time (like in Genting) is the brakes overheating and becoming useless.

Personally driven Proton Saga, old Camry.

[Chai]

Originally Posted by NeoSquall

always go down hill in gear.. let the help you brake.. haha.. safety feature.. so that ur brakes wont overheat.. its not sexy to have your brakes overheating.. its very very very scary... happened to me after a spirited run downhill.. braking distance doubled..

actually... is it true that when your foot is off the throttle and you are in gear going downhill and your car revs more than 3k RPM you are consuming more fuel compared to idling at low RPM? think about it.. your foot is off the throttle.. butterfly valve is closed.. little air is going thru your MAP sensor(if you have TPS.. then the butterfly valve will inform the ECU).. thus making the ECU think that you are in idle mode.. which means its the same as putting it to N..

sensible? if more fuel is going in.. dont you think you will go downhill faster because its the same as you stepping down on the throttle..?

man.. Im bad in explaning.. haha.. hope you guys understand..

Exactly.

RPM and fuel consumption are not directly connected. If your foot is off the pedal, the engine is not using more petrol than at idle, that's why the engine is slowing down. It shouldn't use more fuel when you are in gear going down hill, unless you are on the pedal.

[wiiz]

Adrian, may be should try this...
Automotive Synergy Sdn Bhd
then u can write a review about it..

[Adrian Wong]

Originally Posted by Chai

Exactly.

RPM and fuel consumption are not directly connected. If your foot is off the pedal, the engine is not using more petrol than at idle, that's why the engine is slowing down. It shouldn't use more fuel when you are in gear going down hill, unless you are on the pedal.

Hmm.. I see. So I guess the increased FC comes from having to press the pedal (due to loss of speed from engine braking).

[Adrian Wong]

Originally Posted by wiiz

Adrian, may be should try this...
Automotive Synergy Sdn Bhd
then u can write a review about it..

Hmm.. Their explanations sound a bit iffy. Besides, I thought the engineers would have developed the most optimal operating settings for the engine. Seems a little unlikely for a few guys to improve on that.

[wiiz]

Originally Posted by Adrian Wong

Hmm.. Their explanations sound a bit iffy. Besides, I thought the engineers would have developed the most optimal operating settings for the engine. Seems a little unlikely for a few guys to improve on that.

yeah..that's why we need u to try 1st.
anyway, they claimed that the program was developed by hyundai racing team, and they fine tuned some parameters to suite our fuel/wheather conditions (or something like that ).

[Adrian Wong]

Originally Posted by wiiz

yeah..that's why we need u to try 1st.
anyway, they claimed that the program was developed by hyundai racing team, and they fine tuned some parameters to suite our fuel/wheather conditions (or something like that ).

ROTFL!!! So my car's the guinea pig la..

But frankly, for such software modding, it's really expensive. What I spend on it, I could just use it to pay for petrol.

It doesn't reduce fuel consumption btw, just increases power and torque. Even so, I wonder if it's even possible to boost power and torque by so much in naturally-aspirated engines without the use of turbocharger.

[mikegas]

Originally Posted by Adrian Wong

ROTFL!!! So my car's the guinea pig la..

But frankly, for such software modding, it's really expensive. What I spend on it, I could just use it to pay for petrol.

It doesn't reduce fuel consumption btw, just increases power and torque. Even so, I wonder if it's even possible to boost power and torque by so much in naturally-aspirated engines without the use of turbocharger.

YES, NA car still can be modded to increase power and torque. There are stuff like race chip, more induce air intake and out.. etc. You can even put in an engine management unit which can be hook up to computer to tune. These are very popular with car modder esp playing vtec, mivec and such. I got a mechanic fren who does this for living, if you wish I can intro you.

Of course, car modder would not bother much about fuel consumption, always more power. A trade between the two, power or economical plus comfort or performance.

A good example of car is the Honda City VTEC and IDSI. The price of the Honda City VTEC is extra RM 5K. The performance is maybe extra 30hp. However, the IDSI is winner in economical, as a full tank of that car can go extra 100km than that of VTEC. I got the VTEC version cause want performance...

[Chai]

I don't think the difference is as much as 30bhp.

Piggyback controller costs about RM1k+, it will not save petrol definitely.