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Message: <blockquote data-quote="shiroitenshi" data-source="post: 2569456" data-attributes="member: 27518">Actually if you have MAP sensor/manifold pressure sensor reading it would be good way to know if flow is restricted or not.(I saw a kancil having it, it's like a boost meter, but stops at 0, no 1bar/2bar etc.) Dunno what brand, something from taiwan.At idle, our throttle plate fully closed, makes about. 70Kpa or so of vaccum (depending on engine, it could be more). (this is atmospheric reading, the same like all boost meters)At WOT, our throttle plate fully open, it's 0Kpa or zero vacuum. Ideally, with ram air intake, you can get slightly positive pressure, maybe up to 1 psi, but in my case, it only happens sometimes, depending on temperature and speed. (I'm using HKS open pod with no CAI and no Air piping from bumper.)So if you've driven a boosted car, look at the boost meter and notice that the car idles at somewhere below 0, (that's the vacuum part) and as you punch the throttle, you will see that the meter climbs to 0 (that's the turbine spooling) and then past 0 (boost is still spooling, but started providing boost)But we don't have boost, so, in cases where your engine can pump air as much as the intake/TB allows without restriction, the pressure at the manifold at WOT should be (0Kpa/no vacuum/atmospheric pressure)But if your throttle body and/or your intake are a source restriction, you will see vacuum in your intake manifold pressure. It means that the engine is now trying to suck more air than what your TB/intake can flow, causing the vacuum. That's why at part throttle, you always have vacuum in your intake manifold, because the the engine capacity is trying to pump 1595cc for each revolution (or whatever your engine is) but the TB only lets in xx% amount depending on your throttle plate opening, causing the vacuum.*note this is simplified, and engine doesn't pump 1595cc of air just because it's displacement is 'only 1595', because at high rpm, there are other factors that can help the engine push more than 1595cc of air+fuel. This is just something I figured out when playing with Innovate's LM-1/auxbox and hondata.Actually I haven't heard of Toyota Blacktop whacking the shit out of most B16As, is it common that a Toyota 4AG can possibly whack a B16A with light mods?</blockquote>

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