ATI 15% Underdrive Pulley

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Hemi450hp

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Earlier this week, we setup an account with ATI to start carrying the 15% underdrive pulley that everyone has been asking for since the group buy we had a year or so ago. We will have 20 of these in stock on Tuesday ;)

These pulleys are going to be $419 with free shipping, and you can purchase directly from the link below...

ATI 15% Underdrive Pulley

This a great bolt on part that will free up an extra 10-12hp at the wheels, give you a little better throttle response, and also help keep your crank balanced at higher rpms. The ATI pulleys are not just an underdrive, but they are a damper pulley as well...best of both worlds.

ATIPulley_zpsfb33ae41.jpg
 
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jsteinm1

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More things to spend my money on lol. Would these be suitable for a daily driver? Is there any ill effects of running run, especially if I'm running a large subwoofer as well (1500W RMS)?
 
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Hemi450hp

Hemi450hp

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I ran this pulley on my 03 Hemi Ram and now have 1 on my 2011 daily driver without any issues...Both trucks had/have aftermarket stereo systems. I will be bolting 1 of these on the race truck next week as well.
 
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Hemi450hp

Hemi450hp

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Will these still use the stock belt?

It will require a shorter belt. The belt size for the 09-12 trucks is 77.5" 6 rib, and the 2013+ trucks need a 72" or 72.5" 6 rib belt (I will confirm the sizing on the 13+ truck belt this evening).
 

Tat2hemi

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Dam Matt your going take all my money! It's good that your getting us more bolt on goodies!
 

StaLL1oN

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Matt will these fit the 03 5.7 and what size belt will I need for the swap
 

hemidup

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Matt will these fit the 03 5.7 and what size belt will I need for the swap

ATI already have one available for the 03-08 Rams. Matt should/may have them in stock. Give him a shout.
 

09SMOKINHEMI

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Still have mine in the box from the group buy.... I need to install that baby!
 

emjohn4

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OMG. I want this.

ETA: Is the belt included?

ETA2: Screw it - ordered! I missed the first GB, and was kicking myself all last year. Not again. :)
 
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Hemi450hp

Hemi450hp

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I didn't dyno my crew cab after installing the pulley, but it definitely felt more peppy after the install. I ran my truck at the track last night, and will be running again in the next few weeks after installing the pulley. We will see how the times change.
 

DiabeticKripple

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I didn't dyno my crew cab after installing the pulley, but it definitely felt more peppy after the install. I ran my truck at the track last night, and will be running again in the next few weeks after installing the pulley. We will see how the times change.

okay thank you.

im just leery of these pulleys cause on my previous vehicle they did nothing
 
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Hemi450hp

Hemi450hp

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I put my 03 Hemi on the dyno after adding this pulley, and gained 11hp. I saw a few guys get as low as 8hp and as high as 14hp. The other benefit of the ATI pulleys is that hey are also a damper pulley. This means that when you are revving your motor above 6000rpms, it is going to eliminate crankshaft harmonics to reduce parasitic loss.
 

doz

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any dyno results?

companies sometimes say a pulley will give you more power, but when cars hit the dyno, there is no gain. not saying Matt is a liar though.

Physics man. There are gains with under-drive pulleys. Whether its worth it to you or whether that little gain is felt by each person varies. Even if there is no peak HP gain, your engine will have less drag and you will probably gain throughout the powerband.
 

greychevy

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OMG. Screw it - ordered! I missed the first GB, and was kicking myself all last year. Not again. :)

Lol glad you finally picked one up.

Awesome matt has this set up so this part is more readily avaliable now....good work man :favorites13:
 
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Hemi450hp

Hemi450hp

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OK guys, 6 of the 10 pulleys have already been sold. These will be here tomorrow, and there are 4 left on this first order. We will be ordering 20 more later this week, so I expect those to be here at the first of February.

To those of you that have already placed your orders, I will get them shipped out tomorrow and send tracking info as well. Thank you.
 
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