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SVTPerformance's Chain of Restaurants
The Blower Bistro
Understanding draw-through MAF systems with centri
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<blockquote data-quote="40th GT" data-source="post: 16670721" data-attributes="member: 35899"><p>So I installed a 10% OD crank pulley for my Vortech V1 setup, and it's currently not tuned for that. For obvious reasons I have not attempted to see what the new boost level is, but I noticed while datalogging I have LTFTs climbing to 1.25 on both banks and they quickly settle closer to 1.0 as soon as revs are raised. I've checked all vacuum lines, intake manifold bolts and throttle body bolts/gasket for leaks. There were two evap lines coming out of the charcoal canister that looked suspect so I replaced those. Car no longer smells like fumes but the LTFT behavior hasn't changed. Short term trims average right at 1.0. It's not giving me any codes. The only symptom is this high LTFT.</p><p></p><p>My question is, since the supercharger discharge is after the MAF, did I induce unmetered air by changing pulley sizes? This is my first time working with draw through systems so sorry for the noobish question but I want to understand fundamentals.</p></blockquote><p></p>
[QUOTE="40th GT, post: 16670721, member: 35899"] So I installed a 10% OD crank pulley for my Vortech V1 setup, and it's currently not tuned for that. For obvious reasons I have not attempted to see what the new boost level is, but I noticed while datalogging I have LTFTs climbing to 1.25 on both banks and they quickly settle closer to 1.0 as soon as revs are raised. I've checked all vacuum lines, intake manifold bolts and throttle body bolts/gasket for leaks. There were two evap lines coming out of the charcoal canister that looked suspect so I replaced those. Car no longer smells like fumes but the LTFT behavior hasn't changed. Short term trims average right at 1.0. It's not giving me any codes. The only symptom is this high LTFT. My question is, since the supercharger discharge is after the MAF, did I induce unmetered air by changing pulley sizes? This is my first time working with draw through systems so sorry for the noobish question but I want to understand fundamentals. [/QUOTE]
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SVTPerformance's Chain of Restaurants
The Blower Bistro
Understanding draw-through MAF systems with centri
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