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 How To Tune Air/Fuel Ratio (4G13/4G15 Carburetor), Need ur help guys

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GEFORCEXTREME
post Apr 15 2011, 08:45 AM

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QUOTE(the_catacombs @ Apr 14 2011, 12:55 PM)
his nose is wideband o2 sensor maa...  laugh.gif  laugh.gif
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Added on April 15, 2011, 8:47 am
QUOTE(kyheng @ Apr 15 2011, 06:41 AM)
More air will result cooling effect to your engine.....
If want good response, suggest to blow your original air filter every 1000km.... More work but will work, up to certain extend....
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More air will result cooling effect to your engine?
What air you mean? The air into engine or air into the engine bay? If engine bay then yes, if into engine then wrong. Ppl who use turbo cars have their car tune to be slightly richer (more fuel vs stoich a/f ratio of 14.7) to avoid detonation and provide some cooling effect.

Added on April 15, 2011, 8:49 am
QUOTE(amir_tengkorak @ Apr 14 2011, 11:35 AM)
Hi guys.
Need ur help on tuning "air/fuel ratio" On 4G13/4G15 carburetor.
I changed to open pod setting but not quite satisfied.
Before this stock intake can reach 180kmh but now 160kmh is damn hard to reach.
Few people suggest using spark plug head as screw to tune it but i don't know ler..
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Actually, 160-180 km/h on 1.3 liter is damn impressive if you ask me! I basically never drive over 160 on my 1.6.

Added on April 15, 2011, 8:50 amBtw amir, why don't you give maddriver a call to see if he know how to tune? He's damn friendly, even for a shy guy like me I have no problem talking to him.

This post has been edited by GEFORCEXTREME: Apr 15 2011, 08:50 AM
GEFORCEXTREME
post Apr 16 2011, 11:13 AM

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QUOTE(kyheng @ Apr 15 2011, 09:54 AM)
So, our friend's car is normal or turbo engine? Use a gas detector to test your exhaust gas first before bringing that uncomplete version of wiki info.
That 14.7 are just a general ratio, still have to know the hydrocarbon chain that have inside petrol.

Added on April 15, 2011, 9:55 am
Yeah, just stick with original. Other mods like spark plugs, plug cables, extra grounding will give you better results, best of all, improve your FC....
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Bro, you're so funny, I'm just pointing that you're wrong. It doesn't matter if our friend's car here is turbo or NA. Leaner A/F ratio will not make the engine cooler.

Gas detector? Do you mean air/fuel sensor? shakehead.gif shocking.gif

Basically, the closer to A/F ratio of 14.7, the more optimum your engine will be. Too lean and it will cause problems, too rich and you're wasting fuel.

How to know the hydrocarbon chain inside petrol? So you mean the mechanic/tuner must first study Bachelor in Chemical Engineering first?

STOP SPREADING WRONG INFO ALREADY!

Added on April 16, 2011, 11:14 amAnd enough of your sinkalan!

Added on April 16, 2011, 11:16 amAt least try to Google or Wiki first before you say anything from your "intuition" or "experience".

Added on April 16, 2011, 11:20 amThat's why for fuel injection engines, ppl buy management to tune after they have done some significant mods on their car. They want the max power they can get though their mod and this is done by bring back the A/F ratio as close as stoich as possible.

This post has been edited by GEFORCEXTREME: Apr 16 2011, 11:20 AM
GEFORCEXTREME
post Apr 16 2011, 06:50 PM

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This post has been edited by GEFORCEXTREME: Apr 16 2011, 07:08 PM
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