Underdrive Pulley for Victory Explained... And why is the Indian Challenger so quick???

[@painsrides3616]

I'm looking into buying a Victory with an UD pully... Thank you for the deep(er) dive into how it does what it does.

[@coryackley944]

Glad you found it helpful.

[@broggyr]

I've had the UD pulley on my Cross Country Tour for several years now, and I feel like it should have come that way from the factory!

[@amphibdriver1]

This video really explans why the 108 Challenger engine feels so fast vs a 106 Victory engine.

[@coryackley944]

Thank you sir!

[@hammeredsteelperformancehs1120]

Yeah they are quick, I've heard from a buddy that his tuned Challenger out run a 117 Vic XC.

[@amphibdriver1]

@@hammeredsteelperformancehs1120--> From a stop Blake's Challenger that the Lloyds ECM flash, Stage two air filter, my modified Indian mufflers leave me like I'm hardly moving from a stop up to 90 mph because his 108 engine gains RPM's so fast.

[@hammeredsteelperformancehs1120]

Yes they are quick, but also with your 140+ tq and 130+ hp on your 128 HD, got to turn the rpm up. You have plenty of power to leave him, but you would have to operate in that 5000-6500 rpm window.

[@amphibdriver1]

@@hammeredsteelperformancehs1120---> I agree but like the five friends, I know that race on the street have all had to switch to a chain drive which is very costly on a Harley M8.

[@I_am_archie]

Howdy thanks for the info. I have a 14 Vision. Lloydz timing wheel 3° advanced. Lloydz filter along with a K&N in the front. I believe 505 cams and a PC V it was tuned in Az. at 200ft elevation by previous owner. I live at 4500 ft in Utah. Bike has Cary Foss pipes. I'm not convinced it's running as good as it could at my elevation. I also pull a bushtec trailer as I travel around the west working on a Railroad. I wonder if the 413 cam would make much difference. Perhaps the under drive pulley and lose the PCV for a maximus tune.... I don't know....

[@coryackley944]

While I prefer 413s over the 505. I do not think that the little bit of bottom end you will gain would be worth the extra expense sir. Now if money is not a concern then I do think there will be some gains in the 2000-3500 rpm range.

[@I_am_archie]

Well I did the under drive pulley and a maximus tune by remote. Before the tune I wondered if I made a mistake with the UD. Howrver after the tune. I'm Loving it!

[@benreavely4891]

Good information thank You. Question is the XRC and XC geared the same?

[@hammeredsteelperformancehs1120]

Yes they are sir.

[@andrewmainey7814]

just put one on my 2014 hammer , everything happier , motor sounds alive and in the right rev range for cornering , 6th is actually getting used and at freeway speeds the motor is happy again. I have talk tubes timing wheel fuel controller and quarter turn throttle ring . with this gearing change you have a lot more punch on demand. It will put a smile on your dile.

[@TheJa5656]

Do you have a video on the overdrive pully for the older 5 speeds ?

[@hammeredsteelperformancehs1120]

The math formula would be in reverse. So the OD pulley is like 5%. So it would take the final drive from say 3.12 to 3.00ish x the transmission gear. But in this case the gain in highway cruise rpm reduction is a plus. I have an OD pulley on my 04 V92TC and the stock pulley on my 03V92CC. Tou can feel the difference in the two.

[@lazerbay6531]

Would the UD pulley compliment the vm1 cams or would there be any negatives with the combination in regards to engine slipping under load?

[@coryackley944]

The only possible adverse affect is increased rpm at highway speeds as discussed in the video. This is not unique to cams, the rpm increase is the result of gear ratio change. No increase in slipping of the clutch, in fact the ratio change is easier on the clutch than stock pulley.

[@poppysadventures2020]

The Challenger is DAMN FAST!!!!!!!

[@hammeredsteelperformancehs1120]

And now you know one of the reasons..

[@briannorwell202]

I'd like to see how a M8 with similar gearing would fare.

[@coryackley944]

I need to check the gearing on the M8s. Good recommendation

[@rickymarx3376]

Can I put a challenger pulley on my Vic cross country?

[@russrogers728]

What about a 116 vic cross country with under drive pulley?

[@hammeredsteelperformancehs1120]

The math formula would be the same. If you mutiple the tq by the gear ratios in the charts in the video you can see the effective tq advantage.

[@1861toyear1865]

Where can I purchase these pulleys? I have a 2015 Magnum.

[@coryackley944]

Conquest Customs sir..

[@ZebraActual]

So how much do you lose in the top end (mph) when running an underdrive pulley?

[@hammeredsteelperformancehs1120]

I have not done the math, but the factory speed limter for X framed bikes is 120mph and in the new steel framed bikes the rpm limiter is 5000 in 5th gear. So in these cases the UD pulley will lose nothing. Now if the factory speed and rpm limiters removed, you might lose a bit 5 mph or so. But again I bet that you may not lose much because you might be able to carry higher in the rpm range due to the better gear will allow one to pull higher rpm in higher gears needed to fit wind resistant and such. The change with an UD is only 7%. It is not like goning from a 2:73 rear end to a 4:10 in a old muscle car where you are losing 30 mph on the top end.