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 RPM reading @ 110km/h, survey

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J1@l_ l_l l\l
post Aug 26 2009, 09:56 PM

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QUOTE(sleepwalker @ Aug 1 2008, 10:33 AM)
Which part of 'fixed RPM per km/h' that you don't quite understand? It's a constant and not a variable as the gear ratio is fixed per gear.
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Yupe, agree with U, but tht would be for manual transmission it has fixed gear ratios n most importantly it's a direct drive, thus the factor between vehicle speed n engine for each gear is a constant.

But do U think the same applies to automatic transmission which is using non direct drive but torque converter instead, not to mention bout those auto trannies with lock up clutch tht most of the vehicle r using nowadays.

How bout CVT which might generate minor friction between it's pulley n it's drive belt/chain? rolleyes.gif
J1@l_ l_l l\l
post Aug 27 2009, 01:30 AM

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QUOTE(ZeroSP @ Aug 27 2009, 02:19 AM)
Honda City 2009 i-VTEC (5AT)

100KM/H at 2000 RPM
120KM/H at 2500 RPM
140KM/H at 3000 RPM
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S (with smaller wheel) or E (with bigger wheel)?

Planning to get 1? Any comment? Hows d accereration after 120km/h?
J1@l_ l_l l\l
post Aug 27 2009, 01:01 PM

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QUOTE(ZeroSP @ Aug 27 2009, 01:33 PM)
E-Spec... The full spec with 16' rims...

Acceleration is decent until 165-170 for me... As I experienced few times in long KESAS drive... Never tried to go pass that, and do it when the road is quite free la of course...

Added on August 27, 2009, 12:34 pm

Ya I suppose... I also got a City CVT, but VTEC... 140 I can get at 3200RPM...
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hmm.gif Do U think it can go beyond the 170km/h mark? If really it can only manage to do 170km/h, quite dissapointing lo 4 a 120 ponies vehicle with 1.16 ton of weight. Our M'sia boleh Waja with 125 horses inside can theoritically manage 196km/h with 1.235 ton (auto) of weight leh...

With the City has the power/weight ratio greater I was expecting tht it can do better... cry.gif

Anyway, decided liau, most probably won't change my mind unless they come up with higher reviewed price lor.
J1@l_ l_l l\l
post Aug 29 2009, 01:11 AM

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QUOTE(kersing @ Aug 29 2009, 12:43 AM)
iswara SE... 110kmh at 3250rpm

the car has terrible fuel consumption
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Brather kersing, where did U buy the iswara SE wooh? Did Proton come up with SE edition for Iswara?
J1@l_ l_l l\l
post Aug 29 2009, 08:43 PM

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QUOTE(pedanglaut @ Aug 29 2009, 09:35 PM)
there is different between car FC n engine FC IMO hmm.gif ..car FC depend on other factor like aerodynamic of car
imagine cruising at 220 kph, drag force give most impact on FC i think..
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Not 2 4get abt torque/weight ratio... directly propotional to fuel comsumption but inversely propotional to coefficient drag of aerodynamic.
J1@l_ l_l l\l
post Jan 22 2010, 11:00 AM

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QUOTE(masconan @ Jan 6 2010, 12:19 PM)
RUSA(M) 1.3- 3.8K for 110km/h
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1.3- 3.8K for 110km/h rclxub.gif Sure not brader?

Added on January 22, 2010, 11:08 am
QUOTE(K.I.T.T @ Jan 20 2010, 06:12 AM)
the angin tayar doesnt one of the factor? i use nitorgen make my tyre ringan.
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As a matter of fact, what is the content inside the tyre doesn't effect the vehicle speed/engine speed but the circumference of the tyre (it's outer diameter to be easier understandind), allright this is only bout tyre. But offcourse is known to many of us here tht the transmission gear ratios play a big role.

Added on January 22, 2010, 11:35 am
QUOTE(sam_01 @ Oct 18 2008, 01:32 AM)
My perdana V6 shows ~2800 revs at 110km/h.

To prove it:
Perdana v6 gear ratios:
Gear Ratio    1st  =  2.846
                        2nd  =  1.581
                        3rd  =  1.000
                        4th  =  0.685
Final Gear Ratio        =  4.350
110km/h change to meters/minutes = (110 x 1000) / 60
                                                    = 1833.3 meters/mins

Speed reduction at Final gear = 0.685 x 4.35
                                            = 2.979

Meaning 1 tire rotation equals 2.979 engine turns.

Tire circumference (stock perdana v6 205/55 R16) =  1.986 meters.

Tire revs per min = 1833 / 1.986
                          = 922.96 tire revolution / min

Engine revolution per min = 922.96 x 2.979
                                      = 2749 revs / mins

So the calculated engine revs is close the reading on the rev meter (-51 revs).

But that was when my auto gearbox is ok.
Now using manual gearbox becoz my auto box kong already.
Manual tranny reads 3100 @ 110 km/h.
Not sure what are the gear ratios on the manual tranny.
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Does the calculation above applies to automatic box as well since it's using torque converter which means indirect drive unlike manual tranny tht is driven directly by the engine.

This post has been edited by J1@l_ l_l l\l: Jan 22 2010, 11:35 AM
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