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BRZ First-Gen (2012+) -- General Topics All discussions about the first-gen Subaru BRZ coupe |
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08-20-2020, 12:00 PM | #57 |
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This thread necro was worth this underrated quote. And the answer for everyone is "of course".
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08-20-2020, 12:09 PM | #58 | |
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I am however curious about your claim that because this is a boxer motor there's no need to do any dampening. horizontally opposed or not, there's always going to be vibrations and such. If there was no need to dampen them then the OEM would have saved themselves the extra material and cost of making the harmonic damper. That said it may not reduce the engines life by a noticeable amount for most people. |
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08-20-2020, 01:06 PM | #59 | |
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I have read on this very forum that the OEM crank pulley is not a harmonic damper. |
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08-20-2020, 01:23 PM | #60 | |
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08-20-2020, 03:20 PM | #61 |
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08-20-2020, 03:39 PM | #62 | |
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I can't really answer that but here goes anyways. The pulley is a 3 pc design with 2 metal pieces connected my a thin layer of rubber. It is probably as light as 2 mass produced cast metal pieces and a strip of rubber can be. It is probably much cheaper to produce than machined aluminum pulleys are. |
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08-20-2020, 04:04 PM | #63 |
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LWFW made a huge improvement for throttle response. Slight blip is all it takes on downshifts.
I'm also on an E85 tune and whenever I go back to stock tune, I notice the throttle response is not great (yes, after the adjustment period). Love the throttle response on the car now!
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08-20-2020, 07:24 PM | #64 |
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If you are seriously using the car, you will be over 4500 RPM at the least. You may find the harder you drive it the better it feels. In drive to the store mode, it has many peccadilloes.
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08-21-2020, 07:37 AM | #65 | |
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08-21-2020, 07:55 AM | #66 | |
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In the quantities that they are done, it may still be cheaper than machining a bunch of 1 pc pullies. I agree that it is likely just a slight dampener, and not a balancer. |
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08-21-2020, 08:36 AM | #67 | |
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I was actually speaking from my experience when I worked at continental on valves for evap systems (making million of parts) about overmolding being 'expensive'. |
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10-01-2020, 10:26 AM | #68 | |
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However it seems that at high rpm, an H4’s crankshaft incurs flex and that flex causes a vibration. The OEM two-piece pulley with the rubber ring is designed to absorb some of that vibration. If the rubber in the pulley were not present, the crankshaft’s bearings would absorb more of those flex-vibrations. Over time, that could increase wear on the crank bearings and reduce the engine’s lifespan. To what degree does this have an impact? I am clueless. But it seems there is a purpose for that rubber ring. |
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10-01-2020, 04:10 PM | #69 | |
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10-02-2020, 03:46 PM | #70 | |
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