Difference in engine response from lighter pulleys
04-10-2010, 08:48 PM
#1
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Difference in engine response from lighter pulleys
So my objective ass wouldn't allow me to simply be satisfied with my butt dyno. So following the idea of the Worx Tuning Crank Pulley Install video where an overlay shows the estimated difference in the inertia of OEM pulleys versus lighweight ones, and how it affects free-revs, I wanted to do my own to compare. I rarely am satisfied with just theoretical gains (though sometimes it's the only option), so in order to feel confident and prove/disprove the gains I needed to gain some data. 
04-11-2010, 07:15 AM
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you install the full kit? how about the water pump. i was reading its not the best design and can break? Maybe sticking to factory is a good idea. Pulleys will be my next purchase.
If you go SC later down the road,can you keep these pulleys on?
If you go SC later down the road,can you keep these pulleys on?
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04-11-2010, 11:11 AM
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Originally Posted by ap1_tot,Apr 11 2010, 07:10 AM
you got me sold man 
how hard was the installation?
how hard was the installation?And yeah, I installed all of them. Crank and drive. The crank is the harder one because apparently it is very tight and you need a special tool or something. About the SC, I don't know, but I'd think so.
If you want the best bang for your buck, maybe look at a lightweight flywheel first, and then down the road this. That's just my opinion.
04-11-2010, 11:16 AM
#9
You guys are morons.
Look. Do the math. The videos recorded at 30FPS. That's 30 frames per second. Thus, the difference between frame 24 and 25 is :gasp: 1/30th of a second. Again, that's 1/30th of a second to 6k. At 9k rpm, the difference was 1.5 FRAMES. That's 1/15th of a second.
Like you can tell that with the butt dyno, much less repeat the exact same "experiment" and not come up with the opposite results.
ETA: And it's not as if that 1/30th of a second makes a bit of difference - not on the street, not on a 1/4 strip, not on a road course.
If anything, Manny proved that there's no difference in the revving of the engine.
Look. Do the math. The videos recorded at 30FPS. That's 30 frames per second. Thus, the difference between frame 24 and 25 is :gasp: 1/30th of a second. Again, that's 1/30th of a second to 6k. At 9k rpm, the difference was 1.5 FRAMES. That's 1/15th of a second.
Like you can tell that with the butt dyno, much less repeat the exact same "experiment" and not come up with the opposite results.
ETA: And it's not as if that 1/30th of a second makes a bit of difference - not on the street, not on a 1/4 strip, not on a road course.
If anything, Manny proved that there's no difference in the revving of the engine.
04-11-2010, 11:54 AM
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In all fairness, you're taking it on the context per second. So you're talking of a rate difference. 1.5/30, ~ 4-5%. You know, these would add up over time.
Which by the way, I'm not saying this is the avenue we should all go through to get the best performance gains at the track.
Which by the way, I'm not saying this is the avenue we should all go through to get the best performance gains at the track.
