Torsional Vibration Damper - FA20

[Capt Spaulding]

Engine Labs article on the development of the Fluidampr for the FA20.

It has in interesting comparison between the various alternative designs of crank pulleys using a twin as a test mule.

https://www.enginelabs.com/news/gues...rzwrx-dampers/

[Wally86]

Six year old article... I wonder if anyone is running this?

[nikitopo]

It looks to be an old article. Do they want to sell the old stock?

[Wally86]

For anyone who wants to dig a little deeper: https://www.ft86club.com/forums/show....php?p=3302739

[DarkPira7e]

I knew I had seen this data somewhere. Still, a nice re-read

[x808drifter]

Originally Posted by Wally86

For anyone who wants to dig a little deeper: https://www.ft86club.com/forums/show....php?p=3302739

The one bit of data that the engine labs link has that this one doesn't is a dyno.
The Fluidamper made more power than the OEM and the lightweight lost power.

Then of course there is no way to verify said dyno sheet.

[Wally86]

Originally Posted by x808drifter

The one bit of data that the engine labs link has that this one doesn't is a dyno.
The Fluidamper made more power than the OEM and the lightweight lost power.

Then of course there is no way to verify said dyno sheet.

On the plus side, if a shop wanted too, they could easily replicate this experiment.

[RToyo86]

Interesting. What I took from this is when/if I ever lighten the flywheel I will add this to parts list.

[DarkPira7e]

Originally Posted by Wally86

On the plus side, if a shop wanted too, they could easily replicate this experiment.

To be honest, I'm considering this. I have the FluidAmpr and a lightweight crank pulley. After getting my tune dialed in, I wanted to swap them and see what differences I can tell.

I'm looking for perceived engine roughness, and noise mostly. Still not sure if I'll make the effort just yet but I'll post it I do. My build is a long ways out still do don't expect anything soon

[chipmunk]

OEMs spend a lot of time and resources to tune the whole accessory drive system - rotational inertias, damping coeffs, and frequencies. Unless you tune the whole system including flywheel and all accessories on the belt, it's not wise to change one pulley or flywheel and leave the rest stock. Sometimes torsional dampers work better, some other times having a higher polar inertia work better to tune out the firing order vibrations (2nd in our case).
Higher the inertia, lower the "shock loading". That's why heavier flywheels give smoother ramp ups and ramp downs.

[Capt Spaulding]

Thanks for the insights guys. Sorry if it's old hat to most of you. I noticed the article is a bit long in the tooth (as am I). I ran across it reading up on harmonic balancers/torsional dampers which led me to Fluidampr's site. As a non-engineer what I found most interesting was the theory regarding what's happening. For the mechanical engineering unwashed such as myself Fluidampr's website has some interesting reading material - including a link to another old article about torsional vibration issues with Cosworth's old CA F1 engine (an NA 20,000 rpm, 2.4L V8).

For me anyway, it put to rest the "high performance lightweight crank pulley" fable.

[Project_1796]

Originally Posted by Wally86

Six year old article... I wonder if anyone is running this?

I have run the Fluidampr for 2 years as a daily, the engine powerband feels smoother than stock, no issues at all. It's not a power adder, it will help the engine in the long run. Here is another article from Motoiq https://motoiq.com/fluidampr-the-independent-test/

[DarkPira7e]

Originally Posted by Capt Spaulding

Thanks for the insights guys. Sorry if it's old hat to most of you.

There's absolutely nothing wrong with sharing good, helpful, nonspeculative information I'd rather see an article like this pop up twice a month than shenanigans about the next gen BRZ that people are guessing about

[Wally86]

Originally Posted by Capt Spaulding

Thanks for the insights guys. Sorry if it's old hat to most of you. I noticed the article is a bit long in the tooth (as am I). I ran across it reading up on harmonic balancers/torsional dampers which led me to Fluidampr's site. As a non-engineer what I found most interesting was the theory regarding what's happening. For the mechanical engineering unwashed such as myself Fluidampr's website has some interesting reading material - including a link to another old article about torsional vibration issues with Cosworth's old CA F1 engine (an NA 20,000 rpm, 2.4L V8).

For me anyway, it put to rest the "high performance lightweight crank pulley" fable.

I appreciate it. I had never heard of one.

If this helps make the motor sound less like a diesel, I'm all for it