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Message: <blockquote data-quote="shiroitenshi" data-source="post: 1716293" data-attributes="member: 27518">Finally had someone that allowed me to borrow a fuel pressure meter (and the relevant hoses), so I had a field day with it.The idle pressure are dual, because they're right around the middle, so you can interpret it as 240/250 as 245kpa. stock fuel regulator from B16A, idle = 240/250kpa, max = 300kpa stock fuel regulator from ITR (didn't have CTR's one on hand to test, sold off already!.. but believed to be the same as ITR), idle = 290/300kpa, max at WOT = 350kpastock fuel regulator from H22A, 210kpa, max at WOT = 260kpa (numbers dubious, could be a faulty regulator).. or it could be right, as H22A injectors are much much larger than the B16A/B16B/B18C's 240cc injectors.. By means of visual inspection, it seems like the stock regulators have NO markings that differentiate their capacities, only hint as to how much pressure to be expected is through measuring the circumference of the fuel regulator body itself. bigger = higher pressure, smaller = lower pressure.I'm getting a few possible capacities of the H22A injectors after much research.. one is 280cc, and another is 310cc/320cc after searching on the net. dunno which capacity is correct. Anyone knows for sure?There goes 2 hours of my life today spend testing stock fuel regulator today.. :PWhat a constructive way to spend a holiday.. and yes, I have no life! (>_ The common theory (don't exactly remember, please correct if I'm wrong) is that to double the flow, you need four times the pressure.. so an increase of 20% in fuel pressure should result in a fifth of an increase (rounded up) in fuelling across the rev range.. so a 240cc injector at 100% duty cycle (yes, the honda's ones can go up to that number, as hondata has claimed this to be true as well) should provide near 25% increase in CC, possibly allowing almost near 290ccs to flow at 100% duty cycle.since the stock B16A shouldn't reach 100% duty cycle (I assume), I should get a bit of enrichment in fuelling across the rev range. My B16A was running lean at stock (with the header and intake), hence the attempt to try using CTR/ITRs one in liew of a proper fuel regulator. I'm taking out the plugs either today or tommorow for inspection to see how it goes.Semutapi,I think no responses because most people here not DIY kakilah. Just send to the shop and pay the bills. :P</blockquote>

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