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Engine, Exhaust, Transmission Discuss the FR-S | 86 | BRZ engine, exhaust and drivetrain. |
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06-25-2012, 06:35 PM | #1 |
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Perrin Crank Pulley now available
http://www.perrinperformance.com/brz...z-crank-pulley
Have any of the tuners swapped out this part yet? Do we need to cut the belt and replace it? |
06-25-2012, 07:29 PM | #2 |
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First question, will it not ruin my warranty with Toyota/Subaru? It seems like there is no need to cut anything or replace anything bu the crank pulley. Check out Jeffs blog on your provided link for pictures of the pulley installed.
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06-25-2012, 08:35 PM | #3 |
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Ismt the pem part a harmonic dampener though?
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06-25-2012, 08:47 PM | #4 | |
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Quote:
FRS stock weight:power = 2758/200 = 13.79 Minus 100 lbs = 2658/200 = 13.29 stock weight and 207 hp = 2758/207 = 13.32 Am I missing something? |
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06-25-2012, 09:45 PM | #5 |
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I think that would be correct. I wonder how much more weight could be saved by reducing the weight of the other pulleys?
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06-25-2012, 10:05 PM | #6 |
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Just remember removing rotating mass won't make much difference on a dyno just like removing your passenger seat won't make any difference different on a dyno. It will however rob less power especially in the first gear or two.
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06-25-2012, 10:09 PM | #7 |
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That's probably first gear. As the gears go higher, the engine's proportion of rotational inertia as a part of the total rotational inertia of the drivetrain decreases.
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06-25-2012, 11:07 PM | #8 | |
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Quote:
This is partially why it this part is so popular on the WRX/STI engines. Its noticeable, inexpensive, and a piece of cake to install (on a manual). |
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06-25-2012, 11:10 PM | #9 |
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So thats the same for a under drive pulley kit aswell? Lets say a company claims 8 hp, are they usually claiming that from 1st gear?
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06-25-2012, 11:13 PM | #10 |
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Hey Jeff,
Are these lightweight pulley go well w lightweight flywheel? I know that lightweight pulley & flywheel doesn't go well together |
06-25-2012, 11:20 PM | #11 | |
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Quote:
As for advertising, I'd guess that most companies would advertise 1st gear since that's where it makes the biggest difference. |
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06-25-2012, 11:29 PM | #12 | ||
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Quote:
To give you an idea. Only some EJ20 motors had issues with misfire CEL's from both being installed. Other than that, the 2.5L engines almost NEVER have this problem. I have had about 4 of these with some kind of light weight flywheel and pulley with ZERO misfires, and ZERO problems. Quote:
On this new engine, there is no PS pump, but now its driving the water pump. There is no way, I would want to slow this down! |
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The Following 2 Users Say Thank You to PERRIN_Jeff For This Useful Post: | ichitaka05 (06-25-2012), PERRIN_ADAM (06-27-2012) |
06-25-2012, 11:34 PM | #13 | |
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Quote:
I just remembered my friend's GM8 (coupe Impreza w swapped JDM wrx engine) & when he installed both lightweight pulley & flywheel, it gave him misfire, so that's why I asked. |
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06-26-2012, 01:05 AM | #14 | |
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Quote:
To clarify I did understand this was not a under drive pulley. I was just comparing under dive kits to lighter weight pulleys if the hp gains were greater in 1st gears than say 4th for a under drive kit( crank/alternator or whatever). |
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