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#16
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I am not going to get into an argument here. Seat of the pants analysis and after spending money expectations, will always inflame the issue.
However have those who install lightweight crankshaft pulleys, based on the theories of those who sell them, really thought out what is the total reciprocating weight, in respect of a road going engine with driven accessories. The possible reduction in inertia, by reducing the weight of such a small diameter component is so minimal as to be not worth considering. It is not a wonder that the after market trade, offers pulleys in a pretty anodised finish. The valid argument against this modification, is that Subaru fitted a torsional vibration damper for a reason. Were and are they fools to incur reduced performance at additional cost?
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#17
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all i know is, that mine revs up much quicker, which was noticeable especially when using the Sportshift and .... whoa! i came close to bouncing off the rev limiter! many have used them with no reported cases of failure. there have been cases of the stock pulley separating and failing, however. i will probably keep this car for about 5-6 years (will have ~ 50k-60k by then), so i'm not worried. how it affects the long term, 100k+ mileage engine life, i don't know ......or need to worry about. they are cheap enough to not be a big deal of gain vs. price, but i'd say its a good bang for the buck.
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Alan 1987 928 S4 (Black) SOLD! 1997 SVX LSi (Ebony) SOLD! 2005 Legacy GT (Silver) [Cobb Stg 2+] SOLD! 1987 928 S4 (Black) SOLD! 2005 Forester XT Premium (Crystal Gray Metallic) SOLD! 2008 Lancer Evolution X MR (Apex Silver) [Cobb Stg 1+] 2015 Outlander Sport 2.4GT AWD (Mercury Gray) 2013 G37xS (Obsidian Black) |
#18
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Stock pulleys fail just as often as aftermarket, but mine is more for looks than anything.
In any case there is no hard evidence lightweight pulleys are less reliable than harmonic balancers. You are right, though, considering the tiny weight of a pulley and the huge power of this engine, you won't see any performace gain, but it does compliment a full system of lightened powertrain/drivetrain parts to a degree. It more or less boils down to a compulsion to make something ones own, a little closer to unique. (:
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"That which can be asserted without evidence can be dismissed without evidence." '92 Dark Teal SVX LS-L, >146,000m 3 pedals, 5 speeds., restoration underway. 2012 Honda Insight, slow but cute. |
#19
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__________________
Alan 1987 928 S4 (Black) SOLD! 1997 SVX LSi (Ebony) SOLD! 2005 Legacy GT (Silver) [Cobb Stg 2+] SOLD! 1987 928 S4 (Black) SOLD! 2005 Forester XT Premium (Crystal Gray Metallic) SOLD! 2008 Lancer Evolution X MR (Apex Silver) [Cobb Stg 1+] 2015 Outlander Sport 2.4GT AWD (Mercury Gray) 2013 G37xS (Obsidian Black) |
#20
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1) My stock sized red pulley failed, caused all kinds of drama.
2) I didn't say they were useless, I said they won't give you a noticable power gain unless used on concert with other parasitic loss reducing components. (: Notice however in your pic they are labeled as underdrive (oh, you noticed (; ). They are not convinced light weight alone is enough of a gain.
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"That which can be asserted without evidence can be dismissed without evidence." '92 Dark Teal SVX LS-L, >146,000m 3 pedals, 5 speeds., restoration underway. 2012 Honda Insight, slow but cute. |
#21
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different situation. Quote:
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Alan 1987 928 S4 (Black) SOLD! 1997 SVX LSi (Ebony) SOLD! 2005 Legacy GT (Silver) [Cobb Stg 2+] SOLD! 1987 928 S4 (Black) SOLD! 2005 Forester XT Premium (Crystal Gray Metallic) SOLD! 2008 Lancer Evolution X MR (Apex Silver) [Cobb Stg 1+] 2015 Outlander Sport 2.4GT AWD (Mercury Gray) 2013 G37xS (Obsidian Black) |
#22
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So far that's one for oem and one for aftemarket.
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"That which can be asserted without evidence can be dismissed without evidence." '92 Dark Teal SVX LS-L, >146,000m 3 pedals, 5 speeds., restoration underway. 2012 Honda Insight, slow but cute. |
#23
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if they are completely useless, then why did SPT (Subaru Performance Tuning) use GFB lightweight pulleys (underdriven ones, no less) on their Legacy GT project car? [/QUOTE]
Because they wanted a pulley of smaller diameter, so as to reduce the drive ratio to the driven accesories, to reduce power losses in view of increased RPM.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#24
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__________________
Alan 1987 928 S4 (Black) SOLD! 1997 SVX LSi (Ebony) SOLD! 2005 Legacy GT (Silver) [Cobb Stg 2+] SOLD! 1987 928 S4 (Black) SOLD! 2005 Forester XT Premium (Crystal Gray Metallic) SOLD! 2008 Lancer Evolution X MR (Apex Silver) [Cobb Stg 1+] 2015 Outlander Sport 2.4GT AWD (Mercury Gray) 2013 G37xS (Obsidian Black) |
#25
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#26
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from what i've seen, WRX's that use a lightened flywheel AND crank pulley can throw CEL's, but i've yet to see any trouble/failure from a lightened stock sized pulley alone. BTW....good to see you back, Trevor. hope all is well with you.
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Alan 1987 928 S4 (Black) SOLD! 1997 SVX LSi (Ebony) SOLD! 2005 Legacy GT (Silver) [Cobb Stg 2+] SOLD! 1987 928 S4 (Black) SOLD! 2005 Forester XT Premium (Crystal Gray Metallic) SOLD! 2008 Lancer Evolution X MR (Apex Silver) [Cobb Stg 1+] 2015 Outlander Sport 2.4GT AWD (Mercury Gray) 2013 G37xS (Obsidian Black) |
#27
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__________________
Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#28
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__________________
Alan 1987 928 S4 (Black) SOLD! 1997 SVX LSi (Ebony) SOLD! 2005 Legacy GT (Silver) [Cobb Stg 2+] SOLD! 1987 928 S4 (Black) SOLD! 2005 Forester XT Premium (Crystal Gray Metallic) SOLD! 2008 Lancer Evolution X MR (Apex Silver) [Cobb Stg 1+] 2015 Outlander Sport 2.4GT AWD (Mercury Gray) 2013 G37xS (Obsidian Black) |
#29
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Cheers, Trevor. *<)
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#30
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Dan PS: Sort of quoted from the movie Blazing Saddles. |
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