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Jeep Wrangler YJ
YJ General Discussion
Best Fuel Injectors?
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<blockquote data-quote="machoheadgames" data-source="post: 433207" data-attributes="member: 18789"><p>factory flow rate is 21.0 lbs at 39 psi. If the injectors you look at mention a flow rate at any PSI other than 39, you will have to do math to figure out the flow rate at 39 psi to compare them with stock.</p><p></p><p>For example, the TJ ones I mentioned are like 22.0 lbs at 39 PSI. They're rated for 23ish at 43.5 psi. Not trying to persuade you into those because I know they're way too expensive, just an example.</p><p></p><p>If I remember right, you have to take the square root of the psi difference and then multiply it by the original rating.</p><p></p><p>So....square root of 39/43.5 * 23 = 0.9468 * 23 = 21.7 lb at 39 psi</p><p></p><p>The actual rating on the TJ ones was 23.x (I don't remember exactly) so that's why the math ended up at 21.9/22 ish, not 21.7. </p><p></p><p>Most injectors are rated at 43 or 49 PSI so you'll definitely have to do some math to figure out what you want. Barely anything is run at 39 psi, that's a YJ thing. Hence why they need to be a higher flow injector to make up for the lower standard YJ pressure.</p></blockquote><p></p>
[QUOTE="machoheadgames, post: 433207, member: 18789"] factory flow rate is 21.0 lbs at 39 psi. If the injectors you look at mention a flow rate at any PSI other than 39, you will have to do math to figure out the flow rate at 39 psi to compare them with stock. For example, the TJ ones I mentioned are like 22.0 lbs at 39 PSI. They're rated for 23ish at 43.5 psi. Not trying to persuade you into those because I know they're way too expensive, just an example. If I remember right, you have to take the square root of the psi difference and then multiply it by the original rating. So....square root of 39/43.5 * 23 = 0.9468 * 23 = 21.7 lb at 39 psi The actual rating on the TJ ones was 23.x (I don't remember exactly) so that's why the math ended up at 21.9/22 ish, not 21.7. Most injectors are rated at 43 or 49 PSI so you'll definitely have to do some math to figure out what you want. Barely anything is run at 39 psi, that's a YJ thing. Hence why they need to be a higher flow injector to make up for the lower standard YJ pressure. [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Best Fuel Injectors?
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