Does a Lighter Crank Pulley Do Anything?

I'm going to show how to install a Perrin Lightweight Crank Pulley on my Toyota 86 (FRS) and see if there's any real difference. I'm fully aware that it is not possible to butt-dyno a light crank pulley, but it is possible to measure rev speed between shifts (when gears aren't engaged). The performance gain I'm looking for is quicker blipping for downshifting, so we'll find out if the Perrin Crank Pulley can meet that goal.

[michaelmayfield]

I have been modifying cars for maybe 20 years and I swear underdrive lightweight pulleys are one of the best bang for buck mods you can really feel a difference compared to all the other stuff like headers and intake and I have not had a single problem with any of the cars I had them on.

[jaredsmalley]

As soon as I saw how you waited for the UPS truck, i had to like the vid

[shanew.williams]

Items changed to lighter that will give the most noticable improvement in throttle response, in decending order...(1) Clutch & Flywheel (2) Harmonic Balancer, (3) Crank Pulley. Additionally, "going inside" the engine with lighter Crank, Rods, Pistons & Wristpins then dynamically "spin" balance the whole assembly for smoothness. * These will NOT add much to increase overall HP but each part lightened, in order will greatly improved throttle response.

[tylertwotoms]

I'm a very by the numbers guy, a lighter crank pulley has to do something, albeit it may be very little depending on the power output of the motor, BUT it is doing something. Whether you gained .5hp or 3 it still is making a numerical difference. Its lighter than the OEM pulley, and the rotating assembly benefits from that. This is within the same sort of debate of Lighter rims YES rpf01s will make a difference over most factory wheels, is it something that's going to wow you and change your life? No it wont.

[zanastumasonis]

nothing to test really. basic physics. it decreases rotational mass, the less weight to spin the less power wasted. anyone else saying otherwise needs to go study up. (Edit: read thread, broke clutch pressure plate strap on bmw:) above is still true though, but not worth it)

[itsfantom]

Alright im gonna end any doubts you may have about this once and for all, Ive been driving around with it for about 6 months now and you can feel a slight but very noticeable increase in throttle response as soon as you install it. At the time the car was running an oft stage 2+ tune, the difference is nothing crazy but if you can find them for under a $90 it is certainly worth it. Its never given me issues and if someone were to take out of my car and put the stock one back in without me knowing, id certainly know something is off, rev matching also becomes easier as it decreases rev hang

[yahhbishh.]

It doesn’t add power, it helps free up the power that the motor already puts out

[kadinmejia]

My mans really said "now that the car is warmed up" when it was still dead on cold 💀

[PSPs]

My stock crank pulley just flew off on my 22 year old Celica GTS 😅 . The stock pulley has rubber in between the pulley that connects together, that rubber part I guess started to disintegrate. I was driving and just heard it snap off. Now I'm thinking of upgrading to this because it's all aluminum with no rubber

[notsoaveragejoeJZ]

I wish it was this easy on my IS300, that crank bolt tq spec is like 239ft/lbs and took me hours to break loose lol literally used a 6' chainlink fence post as a cheater bar after i isolated the harmonic balancer!

[airon]

Could you feel the difference in your hands? I was thinking about getting one for better response for my TRD camry (don’t make fun) it’s a cool Camry lol but looking to get better response and power and mainly get most my my stock power restored then go from there. What do you recommend? Also what about the control and stability of your wheel and feel your suspension and your wheels, I feel something kinda wobbling under my foot sorta. Maybe a bushing or some sort. Ball joint is good and all of that but what could make it stronger? Also how do I get the pressure back (sensitive breaking is what I want back) I don’t have leaks in the lines but could there be air? Or what? I was going to get a stainless steel break line kit and a new crank pully and break master cylinder

[buddybestor]

By itself, it may not feel like much, but after a couple of other supporting mods, those differences do add up! It is more for help with shifting (downshifting). But what's interesting is that, in the video, the revs go down faster when the throttle is off. (as expected since the stock pulley has a greater moment of inertia)...so there's more rev hang with the lightweight pulley. How can this be eliminated, maybe a tune? That probably explains why I give it a .5 sec pause in between shifts when upshifting in normal driving scenarios to shift smoother. (3500 is also a sweet spot). I've had mine for about 40K miles with no issue, but I'm still on the stock clutch and stock flywheel. But I do have a carbon driveshaft if that makes any difference. As a side note, since the boxer engine is most balanced vs any other engine (ie inline)....they would be the best candidate for this type of mod.

[friscostreetstories]

What pulleys do is free up HP. It lessens the parasitic drag. To feel the full effect you would need every pully lightened or smaller diameter. And no it doesnt wear anything down, ive had my crank pulley and all the others on for 180k now. VW r32

[balloney]

Will this work on Honda Civics as well?

[socialhostage]

Nice vid! Didn't expect it to do anything haha. With all pullies lightened it would definitily be a noticable upgrade. How much would removing powersteering do? compared to this?

[joes.]

I didn't notice my lightweight crank pulley. But I did notice ditching my stock dual mass flywheel for a lightweight single mass replacement.

[JoeyyTube]

I’m sure youve heard the back n forth on if these are ok or not for our engines. How has it been over the time you’ve had it on? I only have the accessory pulleys not the crank one yet, still reviewing it.

[Jeremy_Hill_]

I wonder if there is any underdrive pulleys for a '96 Corolla with a 1.8L 7a-fe 👀

[Carlb]

On my old BMW it was definitely noticeable, but the stock one is heavy.

[trevorgartner]

Is that Cupertino? Thought it looked familiar