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 RPM reading @ 110km/h, survey

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sjz
post Aug 12 2008, 02:33 PM

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Would like to know is it normal?
I'm trying out a 15 years Iswara A/T with a new transplanted 2004 MegaValve engine. Carrying 5 adults and the rpm for 100km/h is 3900rpm.
I feel that it's way too high because for my Wira which is a A/T also, at most it will be 3000rpm for 100km/h.
So any advice? smile.gif

sjz
post Aug 13 2008, 02:53 PM

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It is 1.5 A/T.. smile.gif
Some more new/recond (not sure) 1.5 MegaValve engine transplanted 4 years ago, at Mid 2004 la...



sjz
post Aug 14 2008, 06:54 PM

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QUOTE(shinjite @ Aug 14 2008, 12:43 AM)
Auto only have 3 to 4 gears for normal road cars (majority 4 gears)

So their ratio is longer under overdrive mode (4th), end up lower rpm at high speeds to save fuel
Update: 4G92p 1.6 manual 110km/h@3100rpm using F5M221XPXL GB
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For A/T with only 3 gears, will be have a high FC?
Imagine going everywhere with your 3rd gear in a M/T.... tongue.gif
Or its different?
sjz
post Aug 20 2008, 01:15 PM

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QUOTE(Lester1987 @ Aug 16 2008, 05:06 AM)
proton wira 1.5 (A) 3.8-4.0
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Is it because of the 3-speed A/T stupid gearbox?
The 3-speed A/T gearbox is really a petrol sucker... smile.gif
Well, a car with only 3-speed A/T can't be used to drive on a Highway, else the FC sure kill you.
Fastest can drive maybe around 70km/h - 80km/h only, at this speed, the FC still acceptable, is your speed is faster than 100km/h, then your engine will drink up petrol like drinking water... tongue.gif

sjz
post Aug 25 2008, 02:42 PM

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Anyone test Perodua Kembara 1.3 (A) non-DVVT before?
I tested and it's 4000rpm...
I'm quite unsatisfied with that figure since it's a 4-speed Auto, not 3-speed Auto.

This post has been edited by sjz: Aug 25 2008, 02:42 PM
sjz
post Aug 25 2008, 09:41 PM

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QUOTE(CooShyRee @ Aug 25 2008, 04:17 PM)
my goodness.. i get that kinda rpm reading in my 3 speed auto yr90 saga..
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I have a year 94 3 speed auto iswara too....
Almost the same.. even the Iswara 110km/h 3900rpm can reach already...
The 4 speed auto Kembara need 4000rpm? sweat.gif
And confirmed O/D gear is working.
I try off the O/D that time........Gosh!!!Almost 5500rpm....

Because the Kembara's gearbox spoilt around May and just change to a recond gearbox cost RM3500++, so will it be the problem of the gearbox?
Or it's normal for non-DVVT Kembara?
Any Kembara user pls confirm here... tongue.gif

Last week i drive from Alor Star to Butterworth using this Kembara, distance should be about 100km+, and i drive constant at speed of 115km/h (4100rpm) almost 1/3 of the fuel is burnt.... rclxub.gif

This post has been edited by sjz: Aug 25 2008, 09:45 PM
sjz
post Aug 29 2008, 02:00 PM

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QUOTE(jackal400 @ Aug 29 2008, 09:27 AM)
hi sjz....im driving one too, and i can confirm that ur reading is true  smile.gif . I got the similar reading as u while driving 110km/h  sweat.gif  sweat.gif
This car has been well known for its fuel guzzling behaviour.....  biggrin.gif
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Wa... Then for fuel guzzling monster ranking, Kembara will be on the top list lol...tongue.gif
btw, just test drive my dad's Mercedes Benz C200.
About 2900rpm can reach 110km/h already.... smile.gif
No wonder although Mercedes Benz is heavy, it won't consume lots of petrol...

This post has been edited by sjz: Aug 29 2008, 02:01 PM
sjz
post Aug 29 2008, 10:22 PM

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QUOTE(shinjite @ Aug 29 2008, 02:14 PM)
high displacement engine mah, actually if you're crusing already, no matter how heavy your car is, it won't consume as much petrol
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But maybe different case for Kembara lol... smile.gif
at 4000rpm all the way just to archive 110km/h, i feel that we are forcing the engine...
the recommended max speed for good fc is like 80-90km/h only... sweat.gif
sjz
post Aug 30 2008, 10:51 AM

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For this type of car, engine should be at least 1.8 right? tongue.gif
sjz
post Nov 5 2008, 07:04 PM

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QUOTE(sam_01 @ Oct 18 2008, 12:32 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.
*
You must be expert in Maths... tongue.gif
Help me to calculate with this...
Kembara.
st: 2.730, 2nd:1.526, 3rd:1.000, 4th:0.696. Rev.:2.290


Added on November 5, 2008, 7:06 pm
QUOTE(stormyz @ Nov 3 2008, 11:04 PM)
user posted image

My RPM 4.5k @ 110 KM/H ...


something not rite..

anyone can guide me...?  cry.gif

4g13 ....
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That external rpm meter maybe not that accurate la....
How you feel about the sound?
You can judge from the sound actually
I feel that original rpm is more accurate.


Added on November 5, 2008, 7:14 pm
QUOTE(ahpaul82 @ Oct 15 2008, 11:37 AM)
98' Perodua Kancil 850EX (M)

[attachmentid=630441]

110KM/h @ 4.2k-RPM  sweat.gif  sweat.gif  sweat.gif
engine want explode already  sweat.gif  sweat.gif  sweat.gif
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I have an old Iswara A/T (1993), put it aside for a long time already.
The result is worst than your Kancil... smile.gif
110km/h need around 4.5.
Last week i have nothing to do, then suddenly arise an idea, why not i try the max speed for a 15 years car.. brows.gif
Then i depress all the pedal while on highway, suprisingly, can get 150km/h and up, but the rpm is 6.5... shocking.gif
And the engine really sounds like it's going to explode anytime soon and you know la..
Proton's quality, it shake like i'm not driving a car but driving a 'horse operated car' instead.
And the sound also like aeroplane going to take off tongue.gif
Then after that when i drive home, the car spoilt already... Pity...
The problem is: When i didn't press the acceleration pedal, the engine will die, any idea how to solve it? Till now still didn't repair it... Just put it aside...


Added on November 5, 2008, 7:16 pm
QUOTE(torresism @ Oct 15 2008, 09:31 PM)
Proton Saga Blm (M) 1.3

90km/h at 3krpm, 110km/h at 3.6krpm, 120 km/h at 4krpm

sweat.gif  sweat.gif  sweat.gif  sweat.gif  sweat.gif  sweat.gif

but the rpm meter easy raised from 3k till 4krpm laugh.gif
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That consider a very bad result for a new car...

This post has been edited by sjz: Nov 5 2008, 07:17 PM

 

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