Can someone explain pulleys to me.
Thread Starter
Launching!
Joined: Oct 2004
Posts: 214
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From: Lake Mary, Florida
Can someone explain pulleys to me. I have searched and the closest thing that came up was
"https://ls1tech.com/forums/showthread.php?t=398593&highlight=what+do+pulleys"
But can somebody that really knows their stuff, explain pulleys, what they do, and what I could do n a bone stock engine car, with no future plans of H/C or anything MAJOR. What pulleys can I do to help the car, and help hp..
Thank you.
"https://ls1tech.com/forums/showthread.php?t=398593&highlight=what+do+pulleys"
But can somebody that really knows their stuff, explain pulleys, what they do, and what I could do n a bone stock engine car, with no future plans of H/C or anything MAJOR. What pulleys can I do to help the car, and help hp..
Thank you.
TECH Addict
Joined: May 2005
Posts: 2,245
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From: Top of 4th Gear; Plano, TX
Pulleys essentially FREE UP more power than anything. It's pretty much a belt that runs all of the additional components on a car (AC, things like that.) I'm sure others can go into quite some detail.
Originally Posted by FLTransAm02
I have searched and the closest thing that came up was
"https://ls1tech.com/forums/showthread.php?t=398593&highlight=what+do+pulleys"
But can somebody that really knows their stuff, explain pulleys, what they do, and what I could do n a bone stock engine car, with no future plans of H/C or anything MAJOR. What pulleys can I do to help the car, and help hp..
Thank you.
"https://ls1tech.com/forums/showthread.php?t=398593&highlight=what+do+pulleys"
But can somebody that really knows their stuff, explain pulleys, what they do, and what I could do n a bone stock engine car, with no future plans of H/C or anything MAJOR. What pulleys can I do to help the car, and help hp..
Thank you.
Pulleys are lighter = less engine effort to turn = more hp to the wheels
faster ramp-up in rpms
slows accessories = less effort to turn them = more hp to the wheels (is this the correct explaination on this point?)
I'll be corrected if anything I said is inaccurate. Easy bolt-on. Go ahead and do it.
The bigger the pulley, the more the parisitic loss of horsepower because it takes more energy to turn the larger pulley. The smaller pully is easier to turn but since it is smaller, you accessories aren't spun as fast, thus they are underdriven.
The bigger the pulley, the more the parisitic loss of horsepower because it takes more energy to turn the larger pulley. The smaller pully is easier to turn but since it is smaller, your accessories aren't spun as fast, thus they are underdriven.
I don't have one yet but I would like to know if the 25% underdrive is noticeable as far as things like your stereo, cooling, lights, AC, and battering charging are noticeably affected.
I don't have one yet but I would like to know if the 25% underdrive is noticeable as far as things like your stereo, cooling, lights, AC, and battering charging are noticeably affected.
I have a decent stereo system, with the asp pulley. Just had my a/c and rear defroster and radio on at the same time today - at idle it was right at 13. not great, but not bad at all. The car is an M6, fyi.
Originally Posted by joblo1978
The bigger the pulley, the more the parisitic loss of horsepower because it takes more energy to turn the larger pulley. The smaller pully is easier to turn but since it is smaller, you accessories aren't spun as fast, thus they are underdriven.
Easiest way to visualize how pulleys work is to think about riding a 10 speed bike (or 24 speed these days
). * The crank pulley on the car is the same as the crank pulley attached to the pedals. Smaller is easier to turn but things go slower. That's fine for M6 and ok for an A4 (slower idle rpm) for normal loads.
* The altenator pulley is the like gears on the back wheel. Bigger is easier to turn but it slows the altenator down.
25% underdrive is pretty big for an A4 with a stock idle speed if you spend a lot of time in stop and go traffic.
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Launching!
Joined: Oct 2004
Posts: 214
Likes: 0
From: Lake Mary, Florida
Wow THANKS a lot, all the insight helps..
So I've learned that they arent a win-win situation, you actually give up things when you change the pullies..It could influence my stereo and stuff? I dunno if I want to do that..Or have mY A/C be unaffected...
I have an 02 LS1 A4..... The horsepower increase lured me in, but maybe its not sucha good deal for my precious daily driver?...
PS: Is any re-calibration needed?
So I've learned that they arent a win-win situation, you actually give up things when you change the pullies..It could influence my stereo and stuff? I dunno if I want to do that..Or have mY A/C be unaffected...
I have an 02 LS1 A4..... The horsepower increase lured me in, but maybe its not sucha good deal for my precious daily driver?...
PS: Is any re-calibration needed?
Originally Posted by Grimes
I have a decent stereo system, with the asp pulley. Just had my a/c and rear defroster and radio on at the same time today - at idle it was right at 13. not great, but not bad at all. The car is an M6, fyi.
Well how about this scenario. i have an A4 car with a system that has two amps pushing approx. 400w RMS each, the main fuse for the system is 100 amps.
i want an underdrive pulley but i dont want to have to get an alt. overdrive pulley. i know raising the idle will negate some of the charging issues i will have, but probably not enough.
will the underdrive pulley require me to get a new battery and alt. to keep my system running?
i want an underdrive pulley but i dont want to have to get an alt. overdrive pulley. i know raising the idle will negate some of the charging issues i will have, but probably not enough.
will the underdrive pulley require me to get a new battery and alt. to keep my system running?
I have the ASP UD crank pulley....at normal highway driving in 6th gear, with the radio cranked up, the headlights dim slightly as a bass note hits...I just have one 10" MTX sub and a 400 watt amp. It may be dimming from the pulley...but who knows...so I either need a capacitor for the system, or a overdrive pulley for my alternator...either would probably fix it.
If you have an A4, get both the UD crank and OD alternator pullies.
If you have a system in either a A4 or M6, I would recommend both the underdrive crank pulley and the overdrive alternator pulley. If you dont have a system in your M6, get just the crank pulley.
If you have an A4, get both the UD crank and OD alternator pullies.
If you have a system in either a A4 or M6, I would recommend both the underdrive crank pulley and the overdrive alternator pulley. If you dont have a system in your M6, get just the crank pulley.
