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Fluidampr Pully
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Re: Fluidampr Pully
It was covered many, many times on nasioc and other places as well that the crank pulley serves no damping purpose. Some rep from subaru confirmed it. Just get the cheapest lightweight pulley you like. I just got the kartboy one in the mail this morning. Good price, not bad looking at all (black), and like 2.4 lbs.
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'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project '97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod Now a mod "over there" ............Photo album |
#3
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Re: Fluidampr Pully
"Some rep from Subaru" was quoted as having said that Australia will importing 700 BRZs each month. Subaru of Australia (who allegedly immediately declined interest in the BRZ) shows on their website that the decision won't be made until later this year. Reps don't hold a lot of credibility in many cases, especially in the department of engineering.
I suppose you could argue til you're blue in the face why Subaru shouldn't use the stock pulley they place on the faces of all their engines because they're eleventy billion pounds and fall to pieces, but I'd search for a better answer than some rep saying so. Look for an answer that makes sense. I wouldn't buy a Fluidampr pulley for a stock or slightly modified Subaru, but for something that'll receive much more punishment, it would definitely be in consideration. The same, I wouldn't buy a lightweight pulley for any car for performance purposes. They look purdy, sure, but the low mass lost at such a tiny moment of inertia doesn't offer much along the lines of rotational benefit. They're easy bolt-ons if you dig the placebo effect, but they quickly become inconsequential as they drown in the rest of the drivetrain. You can tell me I'm wrong and that you felt a difference, and I'll tell you you're imagining things and can prove it by showing some well-established physics-based math.
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Disclaimer: The above post is on the internet. |
#4
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Re: Fluidampr Pully
You can get stock sized pulleys that weight around 18 oz. I had one a while back, but obviously not any more.
Oh and for what it is worth, the only difference I noticed with one installed is that the engine rev'd quicker in neutral. Beyond that no difference really...
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Former: 1994 Barcelona Red(x2), 1995 Brilliant Red, 1992 Liquid Silver, 1992 Ebony(x2), 1992 Pearl White (x2) Current: 2017 Ford Raptor 2017 Kawasaki KLR 1995 Guards Red Carrera 1995 Spec-ish Miata - track car 1957 CJ-5 Last edited by sicksubie; 08-26-2011 at 07:13 AM. |
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Re: Fluidampr Pully
I bought a lightweight pulley becuase my stocker separated. My engine grenaded a few years after that. *shrug* I'll still put it on the new engine.
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Chris 92 Ebony Mica LS-L "A Rolling Restoration": 223,250 KM - Sleeping 2007 STi 6MT, Stance GR+ coilovers, PWR Rad, JDM hood badge, svxfiles 6000K HIDs, JDM Clear Corners, $15/15 min mod, $20/20 min mod, Energy Swaybar Bushings, Hella Supertones horns, Gold STi BBS rims, Group A lightweight crank pulley, A/C system removed, Custom header-back exhaust, Hybrid carbon/metal rear sway bar, restored headlights with CCFL halos 2008 Subaru Legacy Spec B - Diamond Grey Metallic - Sold 2020 Ram 1500 Longhorn - Red Pearl |
#6
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Re: Fluidampr Pully
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__________________
'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project '97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod Now a mod "over there" ............Photo album |
#7
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Re: Fluidampr Pully
looking at parts for my build... sorry for all of you that just wanted to make things pretty, no it's not a gutted pully it's an actual stock style pully however much stronger, and if I ever plan to make 640whp I'd like to know my parts are hardcore
I plan to replace my rusty gross ones with OEM parts either brand spankin new or used in good condition have them sand blasted and powdered if there were underdrive pullies that were light weight I might look into it, however it's not a priority, there is much more power to be made in other ways. |
#8
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Re: Fluidampr Pully
Schwing!!!!!!!!
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www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link |
#9
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Re: Fluidampr Pully
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The EJ motor suffers from very low rotating mass. Put on a exedy twinplate clutch with its lightwieght flywheel and a WRX crankpully and you will suddenly start having nasty misfire issues around and off idle as the engine will start seeing far too large a change in rotation speed with each firing pulse. Smoothing these pulses is critical and keeping enough rotating mass is key. The SVX will have less issues given more firing pulses, more mass, etc. but you still need to keep the engine management happy. |
#10
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Re: Fluidampr Pully
I thought the general consensus on NASIOC was:
Lightweight pulley = OK Extreme Lightweight Flywheel = OK Extreme Light Flywheel + Lightweight pulley = BAD |
#11
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Re: Fluidampr Pully
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The EJ guys have issues with just a lightweight flywheel though it seems like.
__________________
'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project '97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod Now a mod "over there" ............Photo album |
#12
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Re: Fluidampr Pully
Back when I played with them the STi was more sensitve than the WRX to lightwieght flywheels/pullies. Which is in part why its crank pulley was heavier on the STi. It would also affect performance well before you hit the point where it would start actualy misfiring and/or stalling. In many respects the STi engine management was TOO good for proper performance. Awesome for not blowing motors across the parkinglot, but really happy to yank too much timing, dump too much fuel, etc to false readings.
For a street car, I'd keep some kind of isolation to the accessories. For a race car, I'd go with either SFI rated awesomesauce like the fluiddamper, or reliable solid metal... And worry about rotating mass on the flywheel side if I have to. Anyhoo, Nasioc as a souce is often wrong. Lol hundreds (thousands?) of people who were lead down the path to ruin thier turbos by porting the wastegate thanks to mob mentality, bad tuners, and a total lack of understanding about how anything at all works. Things like people pulling more and more timing trying to *LOWER* boost. Yah, you know that wastegate isn't going to do anything when you've spooled the turbo up like a jet engine and feed it huge amounts of air and fuel still burning like a blowtorch when the exhaust valves open. |
#13
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Re: Fluidampr Pully
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What does the isolation between the crank and accessories help with? Protect the crank or the accessories? This is very true. There is a lot of weird stuff going on over there. It's not like here where more experienced members can constantly verify/rectify information - there's just too much traffic. But, there is a lot of information there, and a lot of useful stuff.
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'94 Laguna Blue LSi ~159k.......JDM ultra short-geared 3.900 STi Version 7 6-speed w/ Cobb shortshifter, ECUtune 244,8.1mm/256,9.1mm i/e cams, group N motor mounts, '97 grille, JDM clear corners, Momo JDM Legacy GT steering wheel, apkarian's LED tails, silver STi BBS wheels, PWR radiator, redstuff pads f/r, drilled/slotted rotors, bontragerworks rsb #18, Koni/GC 450f/375r coilovers, Megan Racing adjustable lateral links, KMac c/c plates, Stebro exhaust, ECUtune 1v5, Optima battery in the trunk where it belongs. Turbo project '97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod Now a mod "over there" ............Photo album |
#14
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Re: Fluidampr Pully
^ rocking a lightweight flywheel since day 1
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#15
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Re: Fluidampr Pully
Our TQ weighs about 35#s, plus flexplate.
I just ordered a cromoly 12.5# flywheel for a customer from Colorado, and a Spec Stage 4 clutch. I will get an actual weight in a couple of days. That, compared to a 5.4# to 1.4# crankshaft pully seems like like a bigger deal. Especialy concidering the DIAMETERS of said mass.
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www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link |
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