How To Tune Air/Fuel Ratio (4G13/4G15 Carburetor), Need ur help guys
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 Apr 15 2011, 11:03 AM
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Junior Member
97 posts Joined: Dec 2009 
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QUOTE(amir_tengkorak @ Apr 15 2011, 10:51 AM) Yes agree with u..try and error to get the best result.. https://forum.lowyat.net/topic/1223594I'm hoping for someone to post picture of how to tune the Air/Fuel ratio before i buy longer intake ram pipe or change back to stock..   |
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Apr 15 2011, 04:26 PM
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Senior Member
1,347 posts Joined: May 2009 From: From: From: From: 
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QUOTE(kyheng @ Apr 15 2011, 10:57 AM) Got a screw at the engine, have to adjust that... But the actual location I'm not that sure.... Can always ask your foreman to adjust for you.... I'm afraid foreman also ask to change back to stock! hahahahaQUOTE(h4dRi @ Apr 15 2011, 11:03 AM) Thanks bro..Lean and Rich eh..hmm.. » Click to show Spoiler - click again to hide... « |
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Apr 15 2011, 04:38 PM
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Senior Member
888 posts Joined: May 2006
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Not really, you just say you want to try lor.....
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Apr 15 2011, 04:40 PM
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Senior Member
1,347 posts Joined: May 2009 From: From: From: From:
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QUOTE(kyheng @ Apr 15 2011, 04:38 PM) Not really, you just say you want to try lor..... Hmm..do u know normally how much they charge for it?i'm afraid tomorrow kena chop.. |
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Apr 15 2011, 06:58 PM
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Senior Member
888 posts Joined: May 2006
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When you change engine oil and tune together, should be FOC... Don't tell me you don't have a "regular" foreman that you know....
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Apr 16 2011, 10:10 AM
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Senior Member
1,347 posts Joined: May 2009 From: From: From: From:
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QUOTE(kyheng @ Apr 15 2011, 06:58 PM) When you change engine oil and tune together, should be FOC... Don't tell me you don't have a "regular" foreman that you know.... hehe..got la regular foreman..last night i've change back to drop in. no power ler.. haizzz... |
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Apr 16 2011, 11:13 AM
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Junior Member
60 posts Joined: Jan 2009
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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....   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? 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 am 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 |
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Apr 16 2011, 12:04 PM
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Senior Member
5,261 posts Joined: Oct 2004 From: J@Y B33 
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QUOTE(amir_tengkorak @ Apr 15 2011, 04:26 PM) I'm afraid foreman also ask to change back to stock! hahahaha Lean means lesser petrol go into engine, Rich mean more petrol.Thanks bro.. Lean and Rich eh..hmm.. » Click to show Spoiler - click again to hide... « since more air going in with your open pod, you also have to make more petrol going in to compensate it. or just take your car to shop with CO analyzer to tune it, only tens of ringgit. |
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Apr 16 2011, 12:10 PM
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Senior Member
1,347 posts Joined: May 2009 From: From: From: From:
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QUOTE(xxboxx @ Apr 16 2011, 12:04 PM) Lean means lesser petrol go into engine, Rich mean more petrol. Oooo..since more air going in with your open pod, you also have to make more petrol going in to compensate it. or just take your car to shop with CO analyzer to tune it, only tens of ringgit. nice bro..now can understand a bit..  later will find workshop that have the CO analyzer.. |
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Apr 16 2011, 02:21 PM
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Senior Member
10,975 posts Joined: Jan 2003 From: disini disana
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QUOTE(amir_tengkorak @ Apr 15 2011, 09:05 AM) aiiii...habis meter tu berapa kmh bro?..hihiiiiii... my meter until 180 laa..  QUOTE(amir_tengkorak @ Apr 15 2011, 10:45 AM) Hmm..but sometimes i think it is because of air too fast going inside.. its not making the air flow velocity slower... imagine open ur mouth wide wide and breath... and close half and breath... which is more efficient... open too wide, u have higher cfm with lower air intake velocity.... close half, u will get lesser cfm with higher air intake velocity.... concept slightly same with exhaust, just dat exhaust piping size is meant for scavenging effect while intake isnt....Maybe extend the ram pipe will make the air slower..  QUOTE(GEFORCEXTREME @ Apr 16 2011, 11:13 AM) 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. actually not as close to 14.7:1 as possible... different tuner tune each car differently for different application depending on owner's preference... u tune it close to 14.7 or even 15 for better fuel consumption on lean cruise... but if u want outright power, approx 13-13.5 would be good for NA to produce lean best torque.... turbocharged engine would need richer AF approx 11-12.5, depending on turbo setup...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. |
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Apr 16 2011, 02:43 PM
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Senior Member
888 posts Joined: May 2006
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QUOTE(GEFORCEXTREME @ Apr 16 2011, 11:13 AM) 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? 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 am 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. Added on April 16, 2011, 2:45 pm QUOTE(xxboxx @ Apr 16 2011, 12:04 PM) Lean means lesser petrol go into engine, Rich mean more petrol. Well, I got a gas detector that can do this job, measuring O2, CO, HC.... But you have to come to PD..... Being tested few cars, I can only get CO and O2.....since more air going in with your open pod, you also have to make more petrol going in to compensate it. or just take your car to shop with CO analyzer to tune it, only tens of ringgit. This post has been edited by kyheng: Apr 16 2011, 02:45 PM |
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Apr 16 2011, 06:50 PM
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Junior Member
60 posts Joined: Jan 2009
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deleted
This post has been edited by GEFORCEXTREME: Apr 16 2011, 07:08 PM |
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May 10 2011, 01:36 PM
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Junior Member
81 posts Joined: Nov 2008 
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guys,
my car (old satria 1.3 carb) eat Before tune = RM70 of ron95 petrol for 350km. After tune = RM70 of ron95 petrol for 423km. 17% improvement. Just want to ask, what the average fuel consumption for satria 1.3 carb? stock one. |
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May 10 2011, 02:22 PM
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Junior Member
132 posts Joined: Dec 2008 From: Seremban, Port Dickson
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RM70 423km?
mine iswara 4g91 1.5 ron 95 RM50 can go 320 - 350 |
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May 10 2011, 04:21 PM
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Senior Member
10,975 posts Joined: Jan 2003 From: disini disana
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QUOTE(siqplus @ May 10 2011, 01:36 PM) guys, thats quite good already...my car (old satria 1.3 carb) eat Before tune = RM70 of ron95 petrol for 350km. After tune = RM70 of ron95 petrol for 423km. 17% improvement. Just want to ask, what the average fuel consumption for satria 1.3 carb? stock one. |
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May 10 2011, 05:37 PM
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Junior Member
132 posts Joined: Dec 2008 From: Seremban, Port Dickson
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QUOTE(amir_tengkorak @ Apr 15 2011, 10:45 AM) Hmm..but sometimes i think it is because of air too fast going inside.. i think ur engine are sucking the hot air.. that is y ur FC getting high.. Maybe extend the ram pipe will make the air slower..  |
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May 10 2011, 06:04 PM
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Junior Member
12 posts Joined: Sep 2010 From: Subang Jaya
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QUOTE(siqplus @ May 10 2011, 01:36 PM) guys, my saga 1.3 year 91 my car (old satria 1.3 carb) eat Before tune = RM70 of ron95 petrol for 350km. After tune = RM70 of ron95 petrol for 423km. 17% improvement. Just want to ask, what the average fuel consumption for satria 1.3 carb? stock one. 65 buck = 449 km |
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May 10 2011, 08:40 PM
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Junior Member
81 posts Joined: Nov 2008
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QUOTE(gagak_84 @ May 10 2011, 02:22 PM) RM70 423km? mine iswara 4g91 1.5 ron 95 RM50 can go 320 - 350  that good man. i plan to transplant 91 too. still kumpul duit. my mechanic quote me 5000 for the halfcut, 1500 for labor. can u recommend me other place? Added on May 10, 2011, 8:40 pm QUOTE(the_catacombs @ May 10 2011, 04:21 PM) thats quite good already... yup. me think so too.Added on May 10, 2011, 8:42 pm QUOTE(sinister_sid @ May 10 2011, 06:04 PM) my saga 1.3 year 91 wow. 20 yo car with good fc 65 buck = 449 km This post has been edited by siqplus: May 10 2011, 08:43 PM |
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May 11 2011, 05:16 AM
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Senior Member
861 posts Joined: Dec 2007 From: Bangsar
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@ the_catacombs
U need this la... for better accuracy in tuning your AFR. https://forum.lowyat.net/topic/1845582  |
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May 11 2011, 09:30 AM
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Senior Member
1,347 posts Joined: May 2009 From: From: From: From:
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QUOTE(gagak_84 @ May 10 2011, 05:37 PM) i think ur engine are sucking the hot air.. that is y ur FC getting high.. I've built a custom "super heat shield".And make sure no hot air will be sucked. But still macam shait ler.. Because of not tune after change to open pod. More air than fuel. So not balance. Now tukar balik to stock intake. Super satisfied! FC good,Torque not that good,but top speed is niceeeeeeeee.. This post has been edited by amir_tengkorak: May 11 2011, 09:31 AM |
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