4G15 Gearbox n Ratio

[putra4767]

i dun think the final drive of a 1.6 (if compatible) will be a gud upgrade for a 1.3.
There will not be enough power from da engine...

 

[g88]

agreed with Putra4767

 

[jswong]

With F5M21 gearbox, using stock 175/70 R13 tyres will get you approximately 32km/h per 1000 rpm in 5th gear. You should see 120 km/h at around 3500 rpm.

Besides changing the final drive (which would cost a lot), you can try to upsize your tyre a little to increase the effective gear ratio. For instance, instead of a +2 upgrade to 195/50 R15, try 195/55 R15 instead. It will increase your ratio a bit, e.g. previously 3000 rpm at 5th gear will get your almost 100 km/h, now it will be a little over 100 km/h. If you try something larger like 205/50 R16, the increase will be more prominent - you'll be doing 110 km/h when your meter is reading around 103 km/h.

 

[putra4767]

thats ok but that may have other effects bro...like fuel consuption....power lacking... sluggish

 

[devraj]

Hi Sifu Putra4767,

im using 195/55 R15 tyre with RS06 Enkei Rim.... Im using Racing Clutch Plate (the 4 corners type) and im getting 110km/h 4 - 5 RPM....
Is it something to do with the clutch plate?? isit good having high RPM? i dont use sound muffler too.... only i changed the extractor 4-2-1....

Summore i smell petrol in my ekzos when engine starts.... can feel eye having tears... cos the smell petrol is strong till can make eye drips water...

I remember last time one of frends told me that ekzos cant smell, or makes you drip water from eye... if its makes you then there is something wrong with the setting....

so can anyone advise me..... so basically wat should i do?

 

[devraj]

SIfu ah! kaw meng ah!

 

[SkYwAlKeR]

not sure with ur racing clutch coz i didnt use before....
jz for ur reference, mine is 110kmh @ 3.8k rpm...

as for ur engine tuning... when do u test it??... if early morning start engine, engine will run abit rich in AFR... after when it returns to normal engine temperature, AFR goes back to normal....
put ur hand at the outlet of ur muffler, can feel any water wapour build up on ur palm??...if yes, tuning should be ok....

ohya, dun put ur eyes or face to the exhaust.... its dangerous ler bro....

 

[devraj]

Hahahahaha....
pls lah brother ...no body put face to there lah :D ... what im trying to say is... the smell from the ekzos can make tears from the eye cos of the petroleum smell lah...

i tried in the morning, afternoon and in the evening... the smell of petrol is almost the same on this times.... in the nite it's quite more strong smell....
i feel the petrol mix a bit more where its didnt burned properly in the engine...
so what should i do? or what it can be done? or what is the mistkaes in my engine could be?

 

[SkYwAlKeR]

tune ur AFR mixture... make it balance first....
how to tune arr??... if u wanna diy, refer to carbie thread.... if u send to workshop, should be vr cheap only.... i tuned mine including ignition timing and AFR all for 10bucks..... plus check sparkplugs and so on....

as for ur clutch, tak tau la....

 

[shuqster]

I'm running a stock Satria SE 4G15, changed the air filter only and didnt touch anything else. My RPM peaks at 4.5 on top gear and I get only 150km/h nothing more unless going down hill.

Whats the deal with that. Is it there like a limiter thats hindering my car from going above 150 km/h at top gear? I've heard of other SatSE that have the same symptom and some that don't. Anyone got any ideas about this?

 

[devraj]

Tell you the truth lah brother.... i find that using K&N air filter will be losing powers lah... i find that using original filter is much more better and better pick up....
its cos your engine gets proper cool air....
so if u wanna play the diffrent filter make sure you do the air cool intake...

the cut off for SE engine is 150 or 160? im not sure check out also....
jus my experience... still learning alot in this auto world...

 

[simon]

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

bro im on a 4G15 wira. Originally at 100pkh the RPM shd read 3.0...at 110pkh it shd be almost 3.2-3.3 & 120kph shd be 3.5k & around 139-140pkh shd hit 4k....this is same for both 4G13 & 4G15 on all iswaras & wira except for auto where the readings would be higher slightly.

yr reading way too high (even if we take account of bigger rims/tyres)...the culprit could most likely be a worn clutch...or slipping clutch or the meters spoil.