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  1. #1

    IPSCO U D pulley worth it

    The title didn't format like I wanted it to... is the U/D pulley worth it?

    For those who have installed this unit, what are your impressions after the fact? I'm guessing the net gain, in and of itself, isn't that great, but combined with other bolt-ons maybe it is worth it... ? Any noticeable issues/negative effects on a street-driven car?

    TIA
    2015 Viper GT
    2017 Hellcat Charger

  2. #2
    Enthusiast Fatboy 18's Avatar
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    I only swapped out to one because it added Bling, Not noticed any difference to be honest. Temp still goes up and down etc.
    You do need a different length Belt.


    Sorry Just realised you are asking about a Gen V, pic above is of my Gen 2.

    Cant advise on Gen V sorry.
    Last edited by Fatboy 18; 11-19-2021 at 12:44 PM.

  3. #3
    Enthusiast Lawineer's Avatar
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    There’s a reason the pullies are the size they are. A lot of engineering went into picking the right size. I assure you they are well aware that oversized pullies waste power and gas.
    2013 GTS- Black w/ Gunmetal stripes. DSC Tractive Coilovers, ACR sways, carbon stuff, big wing
    2014 BRZ: Race/track car. Full retarded. 2016 Lexus GX460: Full boring

  4. #4
    Enthusiast Old School's Avatar
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    50k+ miles on my Gen3 with one, no adverse effects - cooling, battery charging, power steering, air conditioning all good.

  5. #5
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    JGK95's Avatar
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    Easiest install ever. If you need help, just holler and I'll get on the phone with you to assist.

    Essentially you're going from a six-inch diameter to a five-inch diameter. You can either reuse the same belt or get a smaller belt.

    Don't know about power claims though as I haven't dynoed it yet.
    Last edited by JGK95; 11-19-2021 at 02:31 PM.

  6. #6
    Enthusiast Voice of Reason's Avatar
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    Yes it works great, I had 8k miles on my 13 and 23k miles on my 14 and no performance or cooling issues. I used the factory belt as well, the only issue I had there was the tensioner on my 13 must have been a little weaker because if I let rpm’s drop too low when starting from a stop I’d get a chirp (belt slip) on the 13. I’ve never gotten that chirp on my 14.

  7. #7
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    SilveRT8's Avatar
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    Got the UD pulley installed on mine 4 years ago along with 3.91 gears and other bolt-ons. No issues so far.
    It's much lighter thasn stock. New Belt is 1'' shorter, but some keep the OE one.
    Claude, '16 GTC-TA2.0 Black, Arrow PCM, Belanger, AR mufflers, 3.91 gears, UP Pulley
    '93 Gen 1 RT/10 Black / '19 GLC63S AMG / '17 Porsche 911 TTS Cabrio / '12 Harley FLH SE 135 ci/ on order MB GLE 63S AMG

  8. #8
    Enthusiast Steve M's Avatar
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    Quote Originally Posted by Lawineer View Post
    There’s a reason the pullies are the size they are. A lot of engineering went into picking the right size. I assure you they are well aware that oversized pullies waste power and gas.
    There's also apparently water pump cavitation at high RPMs: https://driveviper.com/forums/thread...l=1#post164821

    I didn't mind installing one on my Gen 4 because I knew I could bump up the idle RPM to compensate for any potential charging issues (I run a decent stereo system). I probably wouldn't have done it otherwise.
    2008 SRT-10 Coupe - Venom Red Metallic w/ White Stripes - 1/4 Mile Passes (YouTube)
    High Flow Cats | Gen 5 Intake Man. | UDP | HPT | 3.55s | MCS | DSS Axles | Nth Moto Clutch | 11.027 @ 130.06 (Vid), 1.78 60' (+1,622 ft DA, w/ 3.55s & Hoosier Drag Radials)

  9. #9
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    ViperTony's Avatar
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    I have the underdrive crank pulley from Doug Shelby as it's supposed to help to prevent the collapse of coolant hose on the track. I honestly don't know if it makes any difference but incredibly easy to install on the Gen5 FWIW.
    Last edited by ViperTony; 11-19-2021 at 10:20 PM.
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  10. #10
    Enthusiast Steve M's Avatar
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    FWIW, I've seen essentially no increase in my quarter mile trap speeds after installing one, but my data set is pretty limited.
    2008 SRT-10 Coupe - Venom Red Metallic w/ White Stripes - 1/4 Mile Passes (YouTube)
    High Flow Cats | Gen 5 Intake Man. | UDP | HPT | 3.55s | MCS | DSS Axles | Nth Moto Clutch | 11.027 @ 130.06 (Vid), 1.78 60' (+1,622 ft DA, w/ 3.55s & Hoosier Drag Radials)

  11. #11
    Enthusiast Old School's Avatar
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    The reason I installed one was the same reason I did on previous cars, everything on the front of the engine is now turning 15% slower. Being a daily driver, maybe it will last longer. That and a guy on ebay had a couple of new ones for $50 each.

  12. #12
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    No issues here 1,000 miles later.

    underdrive pulleys have been used for years on multiple cars.
    2017 White GTS 1/2 No stripes

  13. #13
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    ViperGeorge's Avatar
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    I believe Mark Johnson told me that IPSCO's pulley is the same diameter as the one SRT used on the ACR-X.
    2017 ACR/TA in 2014 TA Header Orange, #4 of 10.
    2008 Vert in Viper Bright Blue with silver stripes.
    2014 GTS in white with gunmetal stripes. I'm also one of the original 100's

  14. #14
    Quote Originally Posted by Steve M View Post
    There's also apparently water pump cavitation at high RPMs: https://driveviper.com/forums/thread...l=1#post164821

    I didn't mind installing one on my Gen 4 because I knew I could bump up the idle RPM to compensate for any potential charging issues (I run a decent stereo system). I probably wouldn't have done it otherwise.
    As in, you aren't spinning the alternator as fast, so there is less drag (the faster you spin it, the more drag there is), but at the possible expense of the alternator not charging properly at idle. Same goes for the water pump - you are spinning it slower, so it isn't pumping as much water, therefore creating less drag. This was a win-win for the Gen 4 ACR-X, because not only did the underdrive pulley lower the accessory drag, it also reduced pump cavitation at higher RPMs.
    https://driveviper.com/forums/thread...l=1#post164962

  15. #15
    Quote Originally Posted by WA 2 FST View Post
    The title didn't format like I wanted it to... is the U/D pulley worth it?

    For those who have installed this unit, what are your impressions after the fact? I'm guessing the net gain, in and of itself, isn't that great, but combined with other bolt-ons maybe it is worth it... ? Any noticeable issues/negative effects on a street-driven car?

    TIA
    slightly more responsive (on my gen3) probably not more than a 4-5 whp gain but per dollar spent it's a no brainer, unless you need your alternator to spin at full normal speed

  16. #16
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    Arizona Vipers's Avatar
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    Sure, why not? A few ponies, plus it's exactly half the weight
    @9literviper 2013 track car, 2016 ACR, 1996 GTS, 2001 RT/10, 2003 SRT/10


 

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