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Basic Intake and Exhaust Modification Guide, for normal aspirated cars v1.0
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hkh_88
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 May 4 2012, 11:59 AM
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Hi all sifu, - My setup 4-1 extractor with flexi, 2.5" center bullet ( from kweng84 ), HKS silent high power 3" + front to rear 2.5" piping. All parts is from kweng84 except the muffler bought at chop shop Engine setup : 4G93 DOHC Duratech 272 degree Camshaft, Apex'i open pot Problem : Exhaust got cracking sound after 4.5k rpm. Happen after change new extractor and piping and bullet. at first tot is the rear exhaust but after replace still happen. Checked no leaking. sien liao  This post has been edited by hkh_88: May 4 2012, 12:00 PM |
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hkh_88
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May 5 2012, 12:02 AM
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QUOTE(clawhammer @ May 4 2012, 05:35 PM) I'm pretty sure it's one of the parts from WAI HENG that has f***ed up. You probably need to swap and test out. I think so, but weird the extractor n center box was new bought from that shop. Muffler already swap to hks silent hi power. But the cracking sound at high rpm still there |
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hkh_88
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May 5 2012, 06:06 PM
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QUOTE(mADmAN @ May 5 2012, 12:06 AM) with the high cams... i actually think its alright... Its recommend by my tuner. At first is 2" but the flow is not enough. Then second time he recommend 2.5" n open pod. |
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hkh_88
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May 6 2012, 10:19 AM
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QUOTE(shinjite @ May 5 2012, 08:29 PM) How much HP and torque is your 4G93 DOHC outputting now with that setup and the Duratech 272 cams? 145hp on wheel. Torque not remember, hav to dig out my dyno chart. |
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hkh_88
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May 6 2012, 08:05 PM
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QUOTE(shinjite @ May 6 2012, 02:40 PM) That is nice considering you only have cams and open pod filter Which dyno machine did you go with? Not only cam n filter. Got other stuff too. Dyno at formula d pandan indah. |
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hkh_88
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May 6 2012, 11:34 PM
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QUOTE(Vervain @ May 6 2012, 09:39 PM) Can you shoot some video on the cracking sound? aim at the rev meter. Will try. Wonder my ip4 can do it or not? I suspect is the header, coz i saw got a part is touching the screw. Already ask the shop but they say doesnt matter. Will try to swap the header and see. Any good 4-1 header to recommend? Stainless steel or white steel will do. Or a Mivec header is better? This post has been edited by hkh_88: May 6 2012, 11:38 PM |
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hkh_88
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May 7 2012, 12:33 AM
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QUOTE(shinjite @ May 7 2012, 12:08 AM) 4-1 headers, you can opt for Hotbits, Powerzone, Supercircuit or RPW replicas The rest are all stainless steel except for the Powerzone ones which are double chromed. Not sure on the collector sizes of the Hotbits and PZ, Supercircuit one is 2.5" collector, where else the RPW replica is 2.3" at the collector How much is that for 2.5"? |
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