05-07-2019, 12:15 PM | #743 |
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Justin, I'm just going to wade into this gently, but I believe what he was getting at is that the 1320 requires more horsepower to spin. So, within the relative boost range that the 900 and 1320 can make, the 900 will make its boost with less strain on the engine.
Think of it this way, the supercharger is a power adder, yes? But it takes power to make power. So (and I'm going to use fake numbers here, for the sake of argument), say ... Your BRZ NA makes 200bhp. With a blower, your BRZ makes 300bhp. You're using the 900 blower The 900 takes 30bhp to make enough boost to put you at 300bhp. That means the engine is doing the work of 330bhp, thus the rods are taking the strain of the resultant torque. But you lose 30bhp by the time that power gets to the flywheel because the blower is slowing the crank down. Now, same power for NA and boosted You're using the 1320 blower The 1320 takes 50bhp to make enough boost to put you at 300bhp. So now the engine is doing the work of 350bhp. And again, these are made up numbers, but I've actually heard numbers close to this before for blowers, so I don't think I'm far off the mark. This is why these blowers are rated for larger engines, they naturally make more power, so relative to their overall power output, the blower is, as a percentage of power, a smaller parasitic loss / increase in load. The point about the compressor map vs after cooler efficiency is that, if the smaller blower can make enough air to flow the desired CFM, and you can cool that air enough to keep IAT down and ignition inside the engine controlled, you will make the desired power with less strain on the engine - because the blower requires less horsepower to spin it. The 900 with a good cooler really is better matched to a STOCK motor on this vehicle than the 1320. That said, Harrop made their kit to be flexible and allow for it to be used with built motors without needing much modification - so there is far more headroom and potential with their kit over the Cosworth, as is evidenced by their in house race car. Does that make more sense? |
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05-07-2019, 11:39 PM | #744 | |
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I get that. I was more interested in this part of his statement:
Quote:
Usually there are not linear hp gains with progressive smaller pulleys because a charger will hit efficiency and spin/max limits. I’m curious where this kit hits its stride. Is it between 10-20psi? Is it 15-30psi? Is it 20-25psi?
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05-08-2019, 11:03 AM | #745 | |
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Quote:
Cosworth designed their kit to be an OEM level power adder. Harrop designed their kit to allow for dramatic growth. |
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05-08-2019, 03:09 PM | #746 |
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That’s why I posted the compressor map hoping someone could read it and figure it out. It would be cool to know.
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07-28-2019, 11:58 AM | #747 |
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I found this thread on page three. So sad.
I just got my 2020 registration renewal for my 2013 BRZ. No need for a smog this year. At this point I don’t think Harrop will be getting CARB certification. Hopefully I can enjoy the kit for a few more years before smogging will be necessary then I’ll either be swapping to a JRSC or selling the car. We will see what happens then.
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07-28-2019, 12:23 PM | #748 | |
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07-28-2019, 01:46 PM | #749 | |
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From what I understand, the smog law changed from 6 to 8 years, so if I understand this correctly the 2013-14-15-16-17-18-19-20 years of my car will not require smog. In the fall of 2020, my registration for 2021 should include a notice to smog the car, so I have one more year to enjoy this kit. I agree that moving to the JRSC might be a step back from the Harrop, but I am not a fan of the Edelbrock kit, even though it uses the same Eaton TVS 1320 SC. The JRSC seems to have better reliability/less issues, unless I am mistaken, and there are no issues with the Edelbrock kit.
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07-28-2019, 10:39 PM | #750 | ||
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//2013 World Rally Blue BRZ Limited FBM Turbo--gone
//2018 Crystal White Pearl BRZ Ts 2.2l Harrop Supercharged |
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07-28-2019, 11:04 PM | #751 | |
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07-28-2019, 11:27 PM | #752 |
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Crossing fingers
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08-04-2019, 04:27 PM | #753 | |
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Jackson Racing SC Mentioned Here: Spring 2013 Released for sale: Fall 2013 CARB approved: November 21st 2013 https://ww3.arb.ca.gov/msprog/afterm...eo/d-700-2.pdf Works Turbo Mentioned Here: Stage 1 Fall 2014, Stage 2 Spring 2015 Released for sale: Stage 2 Spring 2015 CARB approved: Summer 2015 https://arb.parts/Executive-Order/D-748 Edelbrock SC Mentioned here: Winter 2014 Released for sale: Fall 2015 CARB approved: July 29th 2016 https://ww3.arb.ca.gov/msprog/afterm...o/d-215-93.pdf Harrop SC Mentioned here: Winter 2014 Released for sale: Summer 2015 AU Emission approved: Spring 2016 CARB approved: .........Pending................. https://www.harrop.com.au/blog/lates...sions-approved Just saying. After four years since the release date and over three years since gettin emissions approved in Australia, yet still nothing here, I'm not holding my breath that this will happen. I hope they prove me wrong.
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08-05-2019, 01:34 PM | #754 |
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To be fair, the other 3 companies are based in the US, making it dramatically easier to achieve. But I agree with you, it's been far too long -- they should have taken it more seriously.
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08-05-2019, 04:12 PM | #755 | ||
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08-05-2019, 04:59 PM | #756 | |
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Imagine buying something online and then, instead of the order status moving from processed to delayed-at-port or backordered, clearly describing the situation, it just said pending shipping... forever. Your patience could wear thin. I’m getting there. I’m just fortunate that California extended the smog requirement two more years.
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