Driver problem.

Always rev match before changing to lower gears. u don't rev match, of course jerking.

Quite sure that there is some noise from steering rack when at the bumpy road at 20km\h. Anyone here can share that they have changed the steering rack before?

See I am the only unlucky guy and want to find out how much of the repair cost.

This post has been edited by tychong: Oct 11 2016, 03:37 PM

Dun have this problem. Sometimes i feel the response is not so good have to rev harder but that's it.

When i first got my car alot of creaky sound from the dashboard and steering but after awhile it sort of went away.

but is revving to 3k+ normal? if i use 2nd gear it would be bogged down below 1k and take couple of seconds to climb up to rev, if i change to 1st, gotta rev to 3k+.

change to cvt

Nah. Here is the ratio



Our tire circumference is 2050mm @ 2.05m per rotation

3000 rpm (rotation per minute) at first gear.

Let's calculate..

Gear 1 is 3.538
Final gear is 4.235

3000 / 3.538 (gear 1) = 847.94 rpm at gear 1
847.94 / 4.235 (FD) = 200.22 rpm at drive shaft.

So how much distance we cover with 2.05M wheel..
2.05m x 200.22 = 410.45 meter per minute..

Need to convert that to per hour.. One hour 60 min
410.45 x 60 = 24627 meter per hour.. @ 24.6km/h at 3000 rpm on first gear.. Ngam ah..

----------------------

U trying to achieve same speed on 2ND gear.. Reverse the calculation
Final drive remain the same.. With the drive shaft speed remain the same..
@ 200.22 rpm. Since FD is the same. We need the 2ND output to be same like first at 847.94 rpm

X rpm / 1.913 (2ND gear ratio) = 847.94
X rpm = 847.94 x 1.913 = 1622 rpm.

1600 rpm for 1.8 engine is quite a struggle in my experience.


Hope the maths confuse9u.. Lolz

change to 6 MT close ratio...from R25 quaza...hahahha

Lol thanks, maybe I'm just too used to short shifting and cruising at low rev after all these years of driving my previous car.

quick check .. manual persona (older) ..
ratio :
1 : 3.538
2 : 1.947
3 : 1.343
4 : 0.976
5 : 0.804
FD : 4.052

---------------------------------------

wheel spec 195/60/R15

diameter of rim = 15 x 25.4 = 381 mm
side wall = 195 x 60/100 = 117mm

Overall wheel diameter = 381 + 117 + 117 = 615mm
radius = 1/2 diameter = 307.5mm

wheel circumference = 2 x pi x radius = 2 x 3.142 x 307.5 = 1932mm @ 1.932 meter per rotation

---------------------------------------

to achieve 25km/h .. (25km/h = 25 / 60 = 0.4167 km / minute .. or 416.7 meter / minute) .. on the wheel ..
the wheel cover 1.932 meter per rotation .. so to cover 416.7 meter u require .. 416.7m / 1.932 m = 215.66 rotation per minute (Drive shaft)

Final drive = 4.052
rotation speed at before FD is .. 215.66 x 4.052 = 873.88 rotation per minute (before FD)

1st gear = 3.538
rotation speed at engine is .. 873.88 x 3.538 = 3100 rpm

2nd gear = 1.947
rotation speed at engine is .. 873.88 x 1.947 = 1700 rpm

-------------------------------------------

So it is 100 rpm higher than inspira .. while persona is 100 kg lighter than inspira as well. take consideration of the inspira much more heavier wheels as well...

since i so free calculate.. might as well calculate the theory persona max speed

FD = 4.052
4th gear = 0.976
5th gear = 0.804

max power at 6500 rpm (according to spec)

Tire circumference = 1.932 meter

4th gear 6500 rpm
----------------------

6500 / 0.976 (4th) = 6660 rpm at 4th gear
6600 / 4.052 (FD) = 1643.6 rpm at FD

1643.6 x 1.932 = 3175.42 meter per minute
convert to hours = 3175.42 x 60 = 190525 meter / hour @ 190.5 km/h ..

5th gear
---------
6500 / 0.804 (5th) = 8084.58 rpm at 5th gear
8084.58 / 4.052 (FD) = 1995.2 rpm at FD

1995.2 x 1.932 = 3854.74 meter per minute
convert to hours = 3854.42 x 60 = 231284 meter / hour @ 231 km/h ...
(well, i doubt 112bhp got enough juice to push this speed thou)

need to calculate power effiency loss too, brb, go book toyota now..

that one too high tech.. i dunno how to calculate.. im a peon only..

almost right peon, peon also must high tech too, transmission efficiency almost at 85% , so just minus 15%~20% would be the sweet spot
231km/h - 15%~20% = ~ 196 km/h

lel, toyota can be faster than this.. owaii

that one u calculate power lost .. not the gearing ..
my calculation is gearing .. the question is more like .. 112hp can push the car 231km/h or not .. (the gear can .. )

So if u calculate 20% power lost .. means 112hp x 80% = 90 hp at 6500 rpm ..
it still does not tell u the actual top speed bro .. all it does tell u is .. 6500 rpm . u making 90 hp .. (the max able to be transfer to the wheel).

so if calculated gear.. 5th gear 6500 rpm is 231kmh .. the speed does not change .. Gear ratios are fix.. the question is more like ..90hp .. 1200 kg .. does that power enough to push the car .. not direct minus 20% from the ratio la bro.

go calculate cvt lah hahahahah

Seems like Inspira gears also give similar top speed with stock rim and tire at 6500rpm...

dont worry ... ur car dont have enough power to push to that .. lolz

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izit from prc dat cums wit h6n7 virus like nzh0920 sell before...

no shop roadside anjingliar wit his theory...