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 RPM reading @ 110km/h, survey

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wch5274
post Sep 5 2008, 02:18 AM

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QUOTE(tplcaik @ Sep 2 2008, 11:47 AM)
My waja 1.6cc

110km/j= 2900 rpm. Normal?  blink.gif
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same with me
2900~3000
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wch5274
post Oct 16 2008, 07:02 PM

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QUOTE(lynxs @ Oct 15 2008, 09:39 PM)
waja.....

110 at 3500+ RPM, 120 at 4000 RPM...

feel its damn high for cruising lar.....especially for a 1.6L

Mines the older waja....the one with the mitsu engine
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urs got problem
mine waja auto 2002
3~3.1k rpm for 110km/h


Added on October 16, 2008, 7:03 pm
QUOTE(necromencer @ Oct 16 2008, 02:31 PM)
Mine, persona iafm 1.6 auto

2.9k rpm at 100km/hr
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same with my waja auto 2002
maybe due same gearbox series

This post has been edited by wch5274: Oct 16 2008, 07:03 PM
wch5274
post Nov 4 2008, 01:59 AM

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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.
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thanks sam
now i know how to calculate using gear box ratio vs tyre diameter...
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