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Old 01-30-2016, 01:39 PM   #1
GruppeOne
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Default Fluidampr Crank Dampner Review

I put this on a few years ago now.
There are several posts on NASIOC about these, but no reviews.

So with lightweight crank pulleys being very abundant for Subaru's I chose to
try this product after reading reviews of it.

Now, I'm not interested in debating the necessity of a crank dampner on the EJ motor.
I'm just offering my experience with the product.

The install wasn't bad, but probably not for amateurs.
It did require trimming the edge of the plastic timing cover around the crank to clear the dampner.

After installing the dampner and starting the engine I was a little in shock.
It was making all the noise it normally did, but the vibration into the car felt almost non-existent. I had to put my hand on the shifter to make sure the engine was actually running.

Of course it was and today (years later) I still notice vibration in the car, I think it was the initial difference that was so shocking.

I also had a vibration that would show up in 4th gear and this also got quieter after installing the dampner as well (years later it turned out to be a cracked tooth on the 4th driven gear).

Overall it appears to have out performed the stock dampner noticeably.
I'm very happy with the product and hopefully it will yield some benefit in long term longevity.
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Old 01-31-2016, 03:15 AM   #2
kaczmarz
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Thanks for review.

I had my motor rebuilt recently. I had also installed Group N engine and transmission mounts installed. There're more vibrations and way more noise from engine and transmission that I'd like. I hope that going from lightweight pulley would reduce that.

Did you go to crank damper from OEM or lightweight pulley?

What was the change in performance (spool, power)?
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Old 02-01-2016, 10:28 AM   #3
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I went from the OEM pulley.
There was no noticeable change in performance, other than the improvement in vibration (It just seems to be a better dampner).

I've got the Cusco engine and transmission mounts in mine.
I've never found a great deal more noise or vibration with them, but I did find the tranny cross member bushings added quite a bit.

If you have the OEM dampner, I'd try that first.
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Old 02-04-2016, 05:49 PM   #4
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Thanks for reply. I have Group N engine, transmission, and crossmember bushings. There are some vibrations but for me the noise is the most annoying.

As for transition from one pulley to another, I've got Perrin lightweight pulley and intend to install Fluidampr Crank Damper (Dampener?) as soon as the spring starts. I expect a better initial acceleration but a bit slower spool. Still, I think it's worth it for reliability and a little bit of comfort sake.
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Old 02-28-2016, 12:27 AM   #5
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I finally installed Fluidampr crank damper (dampener?)

Thanks to GruppeOne for the review - since it was so recent it motivated me to do it as soon as it got a littler bit warmer in the Midwest over a weekend.

I have a re-built engine with forged pistons + Group N engine mounts, transmission mounts, and crossmember bushings + Perrin pitch stop. As a result, I had a bit more vibrations and a lot more engine and transmission noise in the cabin.

After I replaced Perrin lightweight pulley (after driving with it for over 3 years) with Fluidampr harmonic balancer I noticed a definite change:

1. Much less noise from the engine and transmission.
It's difficult to butt-quantify it but its really significant: somewhere between 25-50% less.

2. Much less vibrations.
Much less vibration at idle and even less vibration at 5000 RPM. I was surprised how little vibration (compared to before install) there was at high RPMs! When holding steering wheel the only vibrations I could feel was low frequency pulse: most of high frequency vibrations were gone! Also, rough start caused by TGV deletes has been mostly eliminated.

3. More linear (and smoother) acceleration.
With lightweight crank pulley RPMs went up much faster but I could feel that torque didn't go up as fast. I could feel acceleration lagging after RPMs: while doing WOT data-logging, RPMs would go up really fast up to 3000-4000 RPMs but the car wouldn't accelerate as much as anticipated. Other byproducts of this RPM-acceleration lag was jerky ride at low RPMs (up to 2200 RPM) and relatively high RPMs required to start moving reasonably fast from the stop.
This all changed with Fluidampr harmonic balancer: acceleration is smoother, more closely reflecting throttle position; there's significantly less jerking movement when suddenly accelerating or suddenly releasing the clutch at high RPMs; moving from the start requires less (attention drawing) RPMs; and low RPM jerkiness was reduced by more than 75%. And all this while WOT Torque/HP vs. RPM curve was almost identical to the last two with lightweight pulley: I couldn't distinguish between them when all three were drawn in Virtual Dyno (smoothing 2). The same with Boost-RPM spool curves.

4. More stable tune (timing?).
After Fluidampr crank damper/pulley install, a knock I used to get when I stepped harder on gas before engine was fully warmed up, was cut in half.

I'd recommend Fluidampr harmonic balancer to anybody with rebuild engine and/or upgraded mounts: additional vibrations/noise might be fun for some but certainly are not beneficial to your car.

Last edited by kaczmarz; 02-28-2016 at 09:06 PM.
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Old 05-20-2016, 05:21 PM   #6
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Mini comparison of stock vs lightweight vs fluidampr pulleys on the 2015 WRX CVT


LIGHTWEIGHT
1. I decided to try the light weight pulley some time ago. Definite faster response than stock –
rpms climbed faster but torque would lag a bit – I did feel a bit more vibrations of the engine and it got a tad louder.
2. Quick response with the paddle shifters than stock imo
3. Slight jerky ride at times with lower speeds
STOCK & FLUIDAMPR
I am placing the two together because they are a bit more alike. Still with key differences.
First the weight is similar however the fluidampr is even a bit heavier. Size is the same. But of course fluidampr has its fluid technology.
FLUIDAMPR
1. Decreased noise and vibrations from the engine bay (Quieter transmission)
2. Smoother acceleration
3. Decreased jerky ride at lower speeds
4. HTCVT feels “more happy” with it imo – much smoother and better transition of power
5. “Shifting” in the manual paddle mode also seems with more strength and stability.



I am very happy with the Fluidampr – definitely over a low weight pulley. In the long run it will be very beneficial to the car


ADDITIONAL INFO:


FA/FA20DIT Crank Pulley:
Fluidmpr CP Weight (Rotating Weight): 5.8 lb (3.8 lb)
OEM CP: 4.9 lb
Perrin LWCP: 1.2 lb

"Fluidampr is a performance viscous damper. Viscous dampers remove vibration energy from the system by shearing
a free rotating inertia ring back and forth through a highly viscous silicone fluid. This converts the vibration energy into heat,
which is easily dissipated through the sealed inertia ring housing. A free rotating inertia ring adds an extra advantage of
controlling torsional vibration across a broad frequency range and provides the necessary protection as engine modifications are made."

Fluidmpr = Vibratech

Vibratech TVD, located in Springville, New York, is an ISO 9001:2008 certified developer and manufacturer of torsional vibration
dampers for global OEM powertrain divisions in the agriculture, transportation, energy, aviation and defense industries.

A viscous style damper carries a portion of its inertia mass in the outer housing with the remaining mass contained in the inner inertia ring.
The advantage of the viscous style design is that the outer housing provides heat dissipation that contributes to overall superior damper life.

“high power builds benefit extraordinarily well from a Fluidampr performance damper because you’re inducing much greater torsional vibration
amplitudes and heat for what the stock tuned elastomer damper is designed for. For this validation test we went the other direction.
The car chosen was a 2013 Scion FRS equipped with only a high flow air kit and exhaust, plus a mild tune. Initial peak torque and
horsepower measured 141lb-ft and 149rwhp respectively on the Mustang Dynamometer chassis dyno. Torsional vibration control,
along with horsepower and torque gains realized with the Fluidampr performance damper found here will only increase as future modifications are made.

Through creating greater efficiency, the damper releases more (otherwise lost) torque and horsepower over the stock tuned elastomer damper and a light weight pulley.

SFI requirements mandate the damper to be spun at 12,500-13,500 RPM for one hour without failure to meet certification for professional motorsports.
The materials and manufacturing process chosen for this Fluidampr application provide nearly four times the requirement for added safety.
Furthermore, the steel of a SFI certified Fluidampr housing must meet a minimum 40,000psi yield strength and 60,000psi tensile strength under testing.

For torsional vibration measurements, data sets were taken using speed sweeps from 2500rpm – 7500rpm
over a time of 30 seconds in order to capture any resonance points in the operating range of the engine.
Each speed sweep was conducted twice, back-to-back to verify consistency.

2015 WRX FLUIDAMPR


You can get one HERE****
http://www.subispeed.com/2015-subaru...-engine-damper




Stock vs Fluidampr


Prep Work


Final Install



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Old 05-29-2016, 01:48 AM   #7
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The "vibration angle" chart (assuming that FA20 and EJ25 are similar in this regard) might explain the torque bump I experience at top RPMs: slowly tapering torque curve suddenly goes slightly up again, and holds flat to the redline.

The biggest difference so far I noticed since switching from lightweight flywheel (Perrin) to harmonic dampener (Fluidampr) is how stable, comfortable car feels at highway speed (80-90 mph). Vibrations are may be at 50% of what they are at warmed up idle (1,000 RPM).
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Old 07-08-2016, 10:32 PM   #8
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Fluidampr and an AOS helped smooth out the engine. Not a HUGE improvement, but an improvement nonetheless.

I usually cruise surface roads around 3,000 rpm and the car feels very happy there.
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Old 08-09-2016, 07:16 PM   #9
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Totally agree. Car definitely feels more happy at 3k rpm with cruising
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Old 08-10-2016, 03:03 PM   #10
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Great write ups, great product!
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Old 08-10-2016, 03:50 PM   #11
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It's a shame forum users don't browse here more often. Those are great reviews. That may just be my next mod. Currently running a perrin LW crank pulley and it can definitely improve based on these reviews. It is definitely herky jerky at slow speeds and a little hard to always have a smooth gear change in traffic.
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Old 08-29-2016, 07:42 AM   #12
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Thanks for posting the install pics and such. Definitely an alternative compared to a LWCP.

Edit: Just realized the cost -WOWZA.
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Old 08-29-2016, 08:20 AM   #13
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Funny, I didn't have to trim my plastic cover when I installed my Fluidamper.
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Old 08-29-2016, 09:41 PM   #14
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Quote:
Originally Posted by Zombie Panda View Post
Funny, I didn't have to trim my plastic cover when I installed my Fluidamper.
Nobody needs to cut anything when installing the fluidamper. Love this pulley
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Old 09-14-2016, 10:20 PM   #15
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I had to trim my timing cover to install mine, there was no way it was going to go on without. It fouled the snout and wouldn't even press on partway. 2003 WRX for reference sake.

Everything said above is true. I have run both weight OEM pulleys on my 2.0 as well as a Kartboy and as dear as the fluidampr costs, it's amazing how much more quiet and refined it makes the car. It revs more effortlessly and quiets down the transmission. It even takes up clutch chatter. The TGV delete chug is also better with this pulley in place.

It is not a substitute for softer mounts. You will still notice a bit of a bump and shake from time to time but the effortless revs and cruising are where you notice it the most.

The naysayers can say what they want. I've run them all and really, this is the pulley to have if you like a more refined experience. It's expensive, but it's cheaper than a motor and it does what it says on the tin. I'm not expecting HP miracles, but it did significantly smooth out my car to the point I'm going to log it and send it to my tuner to see what he thinks.

My .02$

-Randy
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Old 09-19-2016, 09:38 AM   #16
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nice, Randy. Thanks. Looking forward to my install whenever that would be.
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Old 09-21-2016, 11:39 PM   #17
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Where did everyone get the holder tool? Thank you
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Old 01-01-2018, 05:23 PM   #18
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Just bought one after removing the Perrin lw pulley and going to stock solved huge false knock issues. I've yet to install it, but am excited to do so.
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Old 01-01-2018, 05:54 PM   #19
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They should also compare the vibration difference to an oem, comparing to an ultra light perrin is a huge loss of rotational mass. You also need to consider the flywheel weight into the equation, since an oem will take a lot of vibration away. Having an overall heavier rotational mass added to the crank will smooth the feel no matter what, even swapping oem crank pulley and flywheel to aftermarket lighter versions will change the feel at any speed. Something like the a/c compressor kicking in with a light setup will seem like a misfire, lol.

My car was tuned with a Grimmspeed crank pulley which is pretty light and the main difference I felt was a/c compressor engaging like mentioned before. I installed a perrin and it was even more obvious, lower speed driving was also more touchy and required more clutch work.
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Old 05-30-2018, 10:39 AM   #20
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almost a year on this pulley.. I ran stock pulley, then Grimmspeed lightweight, I was getting some false knock (in very odd rpm ranges not WOT). checked everything, changed, plugs, knock sensors, high heat tesa taped all wires.. etc.. but still had little bits here and there that only showed up on every other log. Well with the Fluidamper pulley it all went away. Noisy engine (I'm on Perrin mounts and WL bushings, BR pitch stop.. etc.. FBO)

https://wheelwell.com/killadawg-09-1...-damper-571101

the in cabin noises also went down by half I felt like. I still can't quiet down my clutch chatter, but those are different maters, this pulley is well worth it!
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Old 05-30-2018, 11:56 AM   #21
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Quote:
Originally Posted by killadawg View Post
almost a year on this pulley.. I ran stock pulley, then Grimmspeed lightweight, I was getting some false knock (in very odd rpm ranges not WOT). checked everything, changed, plugs, knock sensors, high heat tesa taped all wires.. etc.. but still had little bits here and there that only showed up on every other log. Well with the Fluidamper pulley it all went away. Noisy engine (I'm on Perrin mounts and WL bushings, BR pitch stop.. etc.. FBO)

https://wheelwell.com/killadawg-09-1...-damper-571101

the in cabin noises also went down by half I felt like. I still can't quiet down my clutch chatter, but those are different maters, this pulley is well worth it!
Without a question. I love this pulley. One of the best investments for my WRX.
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Old 08-03-2018, 03:42 PM   #22
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Quote:
Originally Posted by killadawg View Post
almost a year on this pulley.. I ran stock pulley, then Grimmspeed lightweight, I was getting some false knock (in very odd rpm ranges not WOT). checked everything, changed, plugs, knock sensors, high heat tesa taped all wires.. etc.. but still had little bits here and there that only showed up on every other log. Well with the Fluidamper pulley it all went away. Noisy engine (I'm on Perrin mounts and WL bushings, BR pitch stop.. etc.. FBO)

https://wheelwell.com/killadawg-09-1...-damper-571101

the in cabin noises also went down by half I felt like. I still can't quiet down my clutch chatter, but those are different maters, this pulley is well worth it!
Did it cut down more on high frequency gear whine, low frequency engine vibrations, gear chattering, or some of everything?
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Old 08-04-2018, 07:29 AM   #23
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Quote:
Originally Posted by violentleaf View Post
Did it cut down more on high frequency gear whine, low frequency engine vibrations, gear chattering, or some of everything?
I would say some of everything. One of the best purchases for my wrx
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Old 08-04-2018, 11:01 PM   #24
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Quote:
Originally Posted by Bellipotens View Post
I would say some of everything. One of the best purchases for my wrx
Well then it looks like I'm in the market for one!
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Old 01-24-2019, 10:42 AM   #25
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Great read. I've never really even though of using one of these dampner's until now. I've always thought that lightweight was the end-all-be-all. This upgrade will be on the list with my built motor.
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