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Message: <blockquote data-quote="zaki" data-source="post: 1719914" data-attributes="member: 1051">thumbs up to you shiro!!! very nice write up. <img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/adore.gif"  class="smilie" loading="lazy" alt=":adore:" title="adore    :adore:" data-shortname=":adore:" /> i would like to contribute some.most injectors are rated at 43psi which is ~ 3 bar. so if you have a 240cc/min injector, it means that the injector will flow 240cc/min at 43psi fuel rail pressure. if i'm not mistaken (do correct me if i'm wrong) all B-series fuel regulators have the same max pressure which is 43psi (during WOT / when the manifold pressure is equivalent to atmospheric pressure). so if you have an Adjustable FPR, you can adjust the max pressure (at WOT) at any pressure you want.Since you mentioned,the injector cc will be different than the rated ones if you change the fuel rail pressure. the theory sayshttp://www.rceng.com/formula-4.giftaken from <a href="http://www.rceng.com/technical.htm" target="_blank">http://www.rceng.com/technical.htm</a>if you have a 280cc/min @ 43psi injector and you change the fuel rail pressure to 50psi. you plug in the data and your injector flow rate will become 302cc/min.similar to your 240cc/min example. do not increase the pressure too much or else your injector will get jammed. if you lower too much the spray pattern won't be nice...the fuel pressure regulator regulates the fuel rail pressure with reference to intake manifold vacuum. from the experiment you did,that is what you will get ;the difference between max pressure and intake manifold pressure is around 0.5~0.6 bar difference. very similar to turbocharge car. if you observe the boost meter, the idling pressure would be around -0.6 to -0.5 bar below 0.it's okay to have a fuel pump that can flow more than what is required. after all, we need to maintain the fuel rail pressure. the rest of them will return into the tank. p/s: maybe sumday we can <img src="https://zerotohundred.com/forums/styles/default/xenforo/smilies/pepsi.gif"  class="smilie" loading="lazy" alt=":pepsi:" title="Pepsi    :pepsi:" data-shortname=":pepsi:" /></blockquote>

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