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The Terminator
Engine/Tuning
Found the cure to our alternator woes!!!
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<blockquote data-quote="BUMPSTICKS" data-source="post: 9393998" data-attributes="member: 49538"><p>I bought mine from Lethal performance. I don't know if ford makes a bigger pulley for our application.</p><p></p><p></p><p></p><p>It's usually the bearings that go out on our alternators. This can also be attributed to the high rpm they are run at from the factory. Some of the aftermarket alternator manufacturers do indeed upgrade the bearings but these can still be affected by spinning them too high. </p><p></p><p></p><p></p><p>I too recommend Jamie at Start N Charge! Best product out there and he has the greatest customer service hands down!</p><p></p><p></p><p></p><p>No. The only pullies that affect boost are the crankpulley and the supercharger pulley itself.</p><p></p><p></p><p></p><p>The math is quite easy. If I have a 3.2 alternator pulley and a 7.5 crank pulley then you divide 7.5 by 2.5 and you get about 2.1. Multiply 2.1 by your engine idle speed, say 800 rpms, and you get 1680. My alternator turns at 1,680 rpms when the car is idleing at 800. So now take your 4# lower which is an 8.5 pulley and divide that by your 3.2 alternator pulley and you get 2.65. So 800 multiplied by 2.6 is 2,080 rpms for your alternator at an 800 rpm engine idle. </p><p></p><p>You have slowed it down in terms of how fast a stock alternator from the factory spins. I believe you could slow it down even more though and never have a problem. Hell, my alternator spins 400 less rpm and I have no issues.</p></blockquote><p></p>
[QUOTE="BUMPSTICKS, post: 9393998, member: 49538"] I bought mine from Lethal performance. I don't know if ford makes a bigger pulley for our application. It's usually the bearings that go out on our alternators. This can also be attributed to the high rpm they are run at from the factory. Some of the aftermarket alternator manufacturers do indeed upgrade the bearings but these can still be affected by spinning them too high. I too recommend Jamie at Start N Charge! Best product out there and he has the greatest customer service hands down! No. The only pullies that affect boost are the crankpulley and the supercharger pulley itself. The math is quite easy. If I have a 3.2 alternator pulley and a 7.5 crank pulley then you divide 7.5 by 2.5 and you get about 2.1. Multiply 2.1 by your engine idle speed, say 800 rpms, and you get 1680. My alternator turns at 1,680 rpms when the car is idleing at 800. So now take your 4# lower which is an 8.5 pulley and divide that by your 3.2 alternator pulley and you get 2.65. So 800 multiplied by 2.6 is 2,080 rpms for your alternator at an 800 rpm engine idle. You have slowed it down in terms of how fast a stock alternator from the factory spins. I believe you could slow it down even more though and never have a problem. Hell, my alternator spins 400 less rpm and I have no issues. [/QUOTE]
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Found the cure to our alternator woes!!!
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