'supposed' to be legal
Basic Intake and Exhaust Modification Guide, for normal aspirated cars v1.0
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 Apr 6 2006, 10:37 AM
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#21
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15,903 posts Joined: Jan 2003 From: Miri   
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Apr 6 2006, 12:38 PM
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#22
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15,903 posts Joined: Jan 2003 From: Miri
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stick with the original header/extractor..... but probably for the piping you can try 2" diamter piping.
and it looks like your fuel consumption is comparable with my b16a. it should be normal because it's a V6.... extra cylinders plus extra weight |
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Apr 12 2006, 04:59 PM
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#23
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15,903 posts Joined: Jan 2003 From: Miri
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QUOTE(freak @ Apr 12 2006, 12:57 PM) I got a question regarding the bullet. i'm not pretty sure what u mean by 'spinning one' .... but straight flowing inlet should provide better flow. the smoother the gas flow, the better it is.What is the difference between a straight flow and the spinning one? Does the spinning ones keep more air? If so what are the advantages? And what is the difference between a short and a long bullter? Does the size really matter? Will a car with a lower CC lose power if equipped with a long bullet? between short and long.... the shorter is better. in fact.... no bullet will give even better gas flow. but the thing is.... the purpose of a bullet is to reduce noise. the longer or the bigger, the better it is. s-flow resonator works the best at noise reduction. |
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Apr 17 2006, 12:43 PM
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#24
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15,903 posts Joined: Jan 2003 From: Miri
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Very useful link although too techie to be understand by some people....
Link added to the 1st page |
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Apr 22 2006, 07:58 PM
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#25
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15,903 posts Joined: Jan 2003 From: Miri
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The cat is the most restrictive part in the exhaust system. There will be some minor significant improvement by removing it.
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Apr 23 2006, 11:53 AM
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#26
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15,903 posts Joined: Jan 2003 From: Miri
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it depends
if you have O2 sensor on/after the cat, probably you'll end up with slightly richer air/fuel ratio. as for noise, as far as i could remember it doesn't affect the exhaust noise at all. |
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Apr 28 2006, 06:37 PM
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#27
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15,903 posts Joined: Jan 2003 From: Miri
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link added to the list
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May 4 2006, 11:20 AM
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#28
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15,903 posts Joined: Jan 2003 From: Miri
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Iswara don't have cat (according one of our member).
If you're thinking of running without any extra bullets or silencers, a good S-flow type muffler will be very helpful in reducing the noise. Running loud car is not a good idea, especially when you have just an ordinary engine. It is annoying and does not prove anything. |
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May 13 2006, 10:55 PM
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#29
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15,903 posts Joined: Jan 2003 From: Miri
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eventhough you want to aim for pickup, but i bet the automatic transmission will make things seemed 'unnoticable'
what car are u having there anyway.... aristo? i guess, you can go for any type of muffler.... it depends on your taste. if you're aiming for power, i'd say a whole exhaust system upgrade is a must. you can also get an SAFC and tune it for better performance. |
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May 27 2006, 10:34 AM
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#30
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15,903 posts Joined: Jan 2003 From: Miri
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can... that's why you need to choose proper exhaust muffler and the right setup
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May 27 2006, 02:02 PM
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#31
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15,903 posts Joined: Jan 2003 From: Miri
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the bigger the muffler 'stomach', usually the better it is at reducing noise, unless the fiber material inside it already finish or not 'fit' enough
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Jun 5 2006, 06:04 PM
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#32
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15,903 posts Joined: Jan 2003 From: Miri
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i thought it was firing order!
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Jun 10 2006, 12:01 PM
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#33
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15,903 posts Joined: Jan 2003 From: Miri
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QUOTE(cheewin88 @ Jun 9 2006, 12:30 PM) bro,i also need some suggestions from u all, yes... your piping does sounds too small for a 2.0 turbocharged....and what's up with that 4-2-1? turbo engines use turbo manifold. turbo manifold does not have 4-1 or 4-2-1... the four extracting pipes just go into the turbo.wat kinds of mufflerand exhaust system shuld i fit into turbo car... i owned a e28 wif rb20det, i sick wif my turbine, now using the third...stock turbine.. everythings i boot up my car feel like N/A, first and second turbine spoiled coz i din change a good exhaust system for it... coz of my frenz told me my exhaust system too small.. now using 2" paiping and 4-2-1, need help guys..i can't every speed it up ever i drive turbo... ish... sumore scare the turbine spoil again... pls guys... teach me wat to do you should go at least with a 2.5" piping, and get a good performance muffler. get an original HKS/Tanabe/APEXi/Trust... no imitation please... they wont last on your turbo car. my friend had stock GTI exhaust on his 4G93T GTI.... within 3 months after swap he already broke his turbo.... bad backpressure. This post has been edited by soulfly: Jun 10 2006, 12:02 PM |
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Jun 14 2006, 12:09 AM
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#34
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15,903 posts Joined: Jan 2003 From: Miri
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the best performance would be no muffler
but then again...the noise is unbearable, and it's against the law having damn noisy exhaust |
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Jun 23 2006, 11:34 PM
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#35
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15,903 posts Joined: Jan 2003 From: Miri
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well... you can actually install a custom ram pipe and add open pod K&N
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Jul 3 2006, 05:12 PM
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#36
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15,903 posts Joined: Jan 2003 From: Miri
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QUOTE(thom_chai @ Jun 24 2006, 08:21 AM) HOw bout a drop in KNN filter for wira efi airbox? is there such a thing for sell in Miri? Sparepart shops that carry genuine K&N filters might have them. I'm not sure which shop, but probably you can try ask Siong Fah (Krokop).QUOTE(wayne @ Jul 2 2006, 10:14 PM) hi, anyone know if Corona ST171 original extractor is ceramic coated? Mine looks cracked.What kind of effects does it caused if theres a crack? Mine has like vase/pot cracks. Cracked extractor is dangerous if it leaks exhaust gas. Just imagine how hot the exhaust gas there.... and it may cause power loss as well.If it's just minor crack lines then it probably still okay, but recommended to be replaced to avoid any unwanted problems later. |
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Jul 7 2006, 05:26 PM
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#37
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15,903 posts Joined: Jan 2003 From: Miri
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QUOTE(blueray @ Jul 6 2006, 11:20 AM) nice write by soulfly...gave me a good insight into mods. i m have just changed my air intake to apexi power intake and looking forward for more modifications. 1) A/F ratio depends on ECU setting. Modification to the intake and exhaust might alter the A/F ratio but not that much, because ECU will re-learn the whole setup again. But then again... it depends on the ECU whether it's tuned based on a/f ratio only or it considers other reading as well.i got some questions tho before i move forward :- 1) will replacing air filters and/or extractors affect the air fuel (AF) ratio of the car since AF ratio is oredi tuned for stock engine? 2) does this affect fuel injection engines? (i understand fuel injections have sensors to detect air volume from intakes & auto adjusts to condition) 3) after modifications such as changing air filter types or replacing extractors, is there a neccesity to retune the engine?? 4) when is retuning of engine required / and in what conditions? 5) what are estimated costs for tuning an engine?? hope any guys can help answer my queries. blueray For carb engine, it depends on the carb and engine setting. 2) For EFI system... the ECU will re-learn and adapt the new setup. 3) Not necessarily, but re-tuning with SAFC and wideband tuner could've been better. 4) Modification to the fuel system, like bigger injectors or such. 5) Proper wideband tuning sometimes cost around RM800-1k, depends on the tuner.... not including the gadgets that you install to tune your engine. Dyno tuning usually much more cheaper. |
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Jul 11 2006, 02:59 PM
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#38
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15,903 posts Joined: Jan 2003 From: Miri
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QUOTE(x800 @ Jul 9 2006, 11:31 PM) i ran on direct pipe for only a couple of days, then i installed a bullet...huyo ur fren uses 3 bullets..maybe i can try add one more too but $_$ I would say.... adding more than one bullet is idiotic. 3 bullet is....  thx for da advice   Better spend on good muffler instead of adding too many bullets. Bullet restricts exhaust gas flow and installing too much of it is just a waste. You get better performance/noise ratio with good muffler plus 1 bullet, compare to crappy imitation muffler with 3 bullet. Loud exhaust (esp those N1 type like APEXi or 5Zigen) are originally meant for track usage, not road... that's why noise is not a concern. QUOTE(thom_chai @ Jul 11 2006, 01:38 PM) M from Miri, Sarawak. For good workmanship... go to William Exhaust @ Kg.Wireless.As for exhaust tuning (exhaust diameter, header type, mufflers etc.) you might wanna ask the experts. Anyway.... you mentioned that you're driving a Wira 1.3 w/ mmc system... right? You can remove the cat... no problem. This post has been edited by soulfly: Jul 11 2006, 03:03 PM |
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Jul 11 2006, 11:54 PM
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#39
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15,903 posts Joined: Jan 2003 From: Miri
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JASMA certified muffler are street legal in Japan and the noise is usually quite low.... unless the fiber inside already finish.
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Aug 31 2006, 08:29 PM
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#40
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15,903 posts Joined: Jan 2003 From: Miri
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JASMA certified exhausts are those approved street legal in Japan, so the sound should be quite low.
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