4G15 Gearbox n Ratio

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devraj

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Hi Sifu Sifu out there....

need an advise on this... i'm using 4g15 engine with original gearbox from 4g13.
I found that when im running on 110km/h the RPM is hitting to 4.5 - 5..

is there anything i can do? can i use any other gearbox to reduce the ratio?
advise what i can do? what wil b the positive n negative if i change the g/box
 
change ur final gear ratio... but that will be costly...
there is a reason for such high rpm... 4g15 isnt a powerful engine... it needs close gear ratio to extract the best power out of ur engine...
 
so what i can do about my gearbox lah? i dont wanna change engine again lah... money matters..... what i can wit wat m having now?
 
err... our gearbox gear ratio is somewhat consider close already... no need to get a closer one or u'll mess up everything....
 
devraj said:
Hi Sifu Sifu out there....

need an advise on this... i'm using 4g15 engine with original gearbox from 4g13.
I found that when im running on 110km/h the RPM is hitting to 4.5 - 5..

is there anything i can do? can i use any other gearbox to reduce the ratio?
advise what i can do? what wil b the positive n negative if i change the g/box

Proton 1.3 and 1.5 have exactly the same gear ratios. I suspect that you have slipped your clutch or your tachometer and speedometer are not reporting correctly.
 
cipan_supercas said:
Proton 1.3 and 1.5 have exactly the same gear ratios. I suspect that you have slipped your clutch or your tachometer and speedometer are not reporting correctly.

i think so also...
 
Then what is the reading supposed to be in my speedometer of tachometer?
 
as for mine, 120kmh @ 3.8k rpm....
me driving stock standard 4g13p iswara....
 
my 4g15 gb hybrid with mivec gb final drive, ok for city driving , but not nice for long trip . =S 90++kmh @ 3k rpm
 
i have a wira 4g15p... i feel it's very good oledy bro compared to 4g13...which is
kinda sluggish i feel for a wira...Iswara is ok coz it's lighter
 
iswara with 4g15 is ok....
but final drive rpm is kinda high... not good if u are using noisy muffler or if u wanna save fuel in long distance drive....
 
4g13p ya correct u can get 3.5-4rpm when u hitting 110-120....
but im talking about 4g15p with 4g13p gearbox.....

4g13p and 4g15p is same gearbox for 100%?? or is there any slight diffrences? if yes pls let know.....by technically or in mechanically

so sifu sifu all telling ...that its on right condition is it? so i supposed not to worry about the ratio isit?
 
according to cipan sifoo in previous post, both 4g13p and 4g15p using exactly the same gearbox with similar gear ratios...
 
change to 1.6 or 1.8 final drive , 4.2 sumthing
then u can cruise highway without worries, but if u plan to drive normally, stick to the same final drive ratio. =) coz converting final drive ratio gonna cost , not a bomb, but at least, it burn holes in ur wallet
 
there is no different between 4G13 and 4G15 gearbox as they using the SAME model F5M21 gearbox.

I can't really what's the RPM at 110km/h but 5th gear at 80km/h my RPM is around 2370 RPM...before i fix it it was 2520 RPM (measurement from digital device)

Btw, mne is 4G15 carby old junk
 
I dunno about manual, but I read through my manual book, for 1.6 auto GB and auto 1.5, the first 3 gears, both ratios are the same
 

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