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Forced Induction & Engine Management
how boost is measured?
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<blockquote data-quote="Battousai" data-source="post: 189130" data-attributes="member: 267"><p>Now that you explain it that way, I finally understand what you're getting at.</p><p></p><p><em>L2 stock turbo : boost start@2500rpm, peak boost@5500rpm</em></p><p><em></em></p><p><em>L2/TD04 hybrid turbo : boost start@3500rpm, peak boost@5300rpm</em></p><p><em></em></p><p><em>this figure could possibly happen. even though the hybrid turbo have bigger compressor housing but it can fill the engine with full boost in just seconds, becos the td04 compressor have better cfm than L2 compressor</em></p><p></p><p>I suspect the reason why that happens is that the compressor side has been upgraded, but the turbine side has not. The bigger TD04 hybrid can input more mass of air into the engine, but the output (exhaust) flow is still the same. That causes choking in the engine resulting in pressure build up. That's why you'd seem to get full boost earlier with a big turbo.</p></blockquote><p></p>
[QUOTE="Battousai, post: 189130, member: 267"] Now that you explain it that way, I finally understand what you're getting at. [i]L2 stock turbo : boost start@2500rpm, peak boost@5500rpm L2/TD04 hybrid turbo : boost start@3500rpm, peak boost@5300rpm this figure could possibly happen. even though the hybrid turbo have bigger compressor housing but it can fill the engine with full boost in just seconds, becos the td04 compressor have better cfm than L2 compressor[/i] I suspect the reason why that happens is that the compressor side has been upgraded, but the turbine side has not. The bigger TD04 hybrid can input more mass of air into the engine, but the output (exhaust) flow is still the same. That causes choking in the engine resulting in pressure build up. That's why you'd seem to get full boost earlier with a big turbo. [/QUOTE]
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how boost is measured?