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I know that a lot of people on here upgrade there underdrive pully. Whats my best bet? Price? Brand? Kind of gains I will see? If you can answer any of these questions that would be great! Thanks in advance!
 

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J33 w/TL LSD 6 Speed
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Search is your best friend. The only option Available is Unorthodox Racings Lightweight Underdrive Crank Pulley, Ultra SS I believe. It runs roughly $175-200, you will need to buy a Gates belt from Napa Auto, runs like $25 bucks IIRC. I have had mine for like 2 1/2 years, the car feels faster, throttle response is better, as for actual WHP gains, maybe 3-5. But the car is smoother and responds better to throttle inputs
 

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Discussion Starter #3
Search is your best friend. The only option Available is Unorthodox Racings Lightweight Underdrive Crank Pulley, Ultra SS I believe. It runs roughly $175-200, you will need to buy a Gates belt from Napa Auto, runs like $25 bucks IIRC. I have had mine for like 2 1/2 years, the car feels faster, throttle response is better, as for actual WHP gains, maybe 3-5. But the car is smoother and responds better to throttle inputs
Awesome! Thanks for the input. Anyone else have anything to add?
 

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Honda Rookie
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I got mine this past Saturday and am going to install it when I get the belt, but I know it weighs 15 oz vs the 6 lbs the stock one weighs, so thats a lot of rotational mass thats now gone, which is awesome.
 

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Street Brawler
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There's actually two pulley's available from Unorthodox. The underdrive pulley and the stock diameter. If you have a pretty good sound system in your car or are planning on getting one I'd recommend the stock diameter pulley. Same if you eventually plan on supercharging it, because the underdrive pulley will actually lose you power if supercharged. If your just running the stock sound system or anything under 600 watts I believe, you can go with the underdrive pulley. Both are pretty much the same except the underdrive pulley "underdrives" the accessories (ac, power steering etc...). According to Unorthodox 80% of the power gains come from the weight reduction with the rest coming from the underdriving. Really won't be a big enough difference to feel either way.
 

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Discussion Starter #8
There's actually two pulley's available from Unorthodox. The underdrive pulley and the stock diameter. If you have a pretty good sound system in your car or are planning on getting one I'd recommend the stock diameter pulley. Same if you eventually plan on supercharging it, because the underdrive pulley will actually lose you power if supercharged. If your just running the stock sound system or anything under 600 watts I believe, you can go with the underdrive pulley. Both are pretty much the same except the underdrive pulley "underdrives" the accessories (ac, power steering etc...). According to Unorthodox 80% of the power gains come from the weight reduction with the rest coming from the underdriving. Really won't be a big enough difference to feel either way.
Not planning to supercharge or have a sound system. But thanks for all the info. It all helps.
 

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FYI, the pulley replaces the harmonic balancer and will probably lead to increased crankshaft torsional vibration. You won't be able to feel it but your bearings will, and the crank may develop fatigue cracks :eek: Although I've never heard of it happening in a Honda it worries me.
 

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Tee-Ooh-Double-Dee
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FYI, the pulley replaces the harmonic balancer and will probably lead to increased crankshaft torsional vibration. You won't be able to feel it but your bearings will, and the crank may develop fatigue cracks :eek: Although I've never heard of it happening in a Honda it worries me.
I thought our engines had internal harmonic balancers? At least that's what I read somewhere since that same topic was brought up before. Can anyone confirm this?
 

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I thought our engines had internal harmonic balancers? At least that's what I read somewhere since that same topic was brought up before. Can anyone confirm this?
There's no such thing as an internal harmonic balancer. Do you mean balance shafts? The J series doesn't have those because 60 degree V6 engines are naturally harmonically balanced. Typically you only see them on 4 cylinders but sometimes also V6's. Some engines also use offset crankshafts (very rare). The harmonic balancer/damper/pulley/whatever only serves to cancel out any resonance frequencies left over from typical V6 end to end vibration.
 

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Tee-Ooh-Double-Dee
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There's no such thing as an internal harmonic balancer. Do you mean balance shafts? The J series doesn't have those because 60 degree V6 engines are naturally harmonically balanced. Typically you only see them on 4 cylinders but sometimes also V6's. Some engines also use offset crankshafts (very rare). The harmonic balancer/damper/pulley/whatever only serves to cancel out any resonance frequencies left over from typical V6 end to end vibration.
Funny thing is after I posted that I thought to myself there's no such thing as an internal harmonic balancer and I should've said it didn't need one. Duh! LOL, anyway, yeah, so there's no harmonic balancer so why would putting on a lighter pulley make it go out of balance and create extra wear on the bearings? I can see if you remove a harmonic balancer but if you're not then how can it be bad? Is it simply because the UR pulley is ligher and the engine needs the weight of the stock pulley to balance it?
 

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J33 w/TL LSD 6 Speed
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There's actually two pulley's available from Unorthodox. The underdrive pulley and the stock diameter. If you have a pretty good sound system in your car or are planning on getting one I'd recommend the stock diameter pulley. Same if you eventually plan on supercharging it, because the underdrive pulley will actually lose you power if supercharged. If your just running the stock sound system or anything under 600 watts I believe, you can go with the underdrive pulley. Both are pretty much the same except the underdrive pulley "underdrives" the accessories (ac, power steering etc...). According to Unorthodox 80% of the power gains come from the weight reduction with the rest coming from the underdriving. Really won't be a big enough difference to feel either way.
I know, but he only asked about which underdrive options were available hehe :)
 

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Funny thing is after I posted that I thought to myself there's no such thing as an internal harmonic balancer and I should've said it didn't need one. Duh! LOL, anyway, yeah, so there's no harmonic balancer so why would putting on a lighter pulley make it go out of balance and create extra wear on the bearings? I can see if you remove a harmonic balancer but if you're not then how can it be bad? Is it simply because the UR pulley is ligher and the engine needs the weight of the stock pulley to balance it?
The factory harmonic balancer basically absorbs vibrational acceleration with its mass. The balancer is the pulley on the J series V6, in some cars they're separate. The mass of the pulley is tuned to whatever order vibrations at whatever engine speed the engineers wanted to cancel out.

Like I said I doubt it's a big deal because Honda builds their engines so well and to much better standards than most other companies. There are quite a few SAE papers on crankshaft fatigue due to too much vibration, but most are cast iron crankshafts. A forged steel crank is about 6 times stronger.
 

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Tee-Ooh-Double-Dee
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The factory harmonic balancer basically absorbs vibrational acceleration with its mass. The balancer is the pulley on the J series V6, in some cars they're separate. The mass of the pulley is tuned to whatever order vibrations at whatever engine speed the engineers wanted to cancel out.

Like I said I doubt it's a big deal because Honda builds their engines so well and to much better standards than most other companies. There are quite a few SAE papers on crankshaft fatigue due to too much vibration, but most are cast iron crankshafts. A forged steel crank is about 6 times stronger.
Interesting. So basically the weight of the pulley is determined by the amount of weight needed to cancel out the engine vibration. Never knew that. I'm sure you're right though, considering how well Honda engines are made it probably wouldn't be much of a stress, but still, good info to have.
 

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Street Brawler
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I know, but he only asked about which underdrive options were available hehe :)
The way I read it, was he was talking about upgrading his crank pulley and just used the term underdrive, maybe thinking that's what they're called. No big deal either way.
 

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Discussion Starter #18
The way I read it, was he was talking about upgrading his crank pulley and just used the term underdrive, maybe thinking that's what they're called. No big deal either way.
Haha yeah im just trying to upgrade the best pulley to make my car faster lol. Sorry!
 
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