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| Electric Supercharge (Page 3/3) |
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skywurz
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DEC 27, 10:15 PM
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"Electric chargers spin up nearly instantly and are used briefly during acceleration to create boost before a turbocharger has the time to spool."
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sanderson231
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DEC 27, 10:29 PM
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| quote | Originally posted by skywurz:
"Electric chargers spin up nearly instantly and are used briefly during acceleration to create boost before a turbocharger has the time to spool." |
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Exactly and if you if you use a an electric turbo in a non-turbo application it gives the same effect as variable valve timing which is significant.------------------
formerly known as sanderson
1984 Quad 4
1886 SE 2.8L
1988 4.9L Cadillac
1988 3800 Supercharged
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skywurz
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DEC 27, 10:55 PM
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not at 1psi - the engines demand for air. The way volvo is doing it as a stopgap for turbo lag is an interesting idea. however you can get way more out of a Fiero for 2500 like a second Fiero
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sanderson231
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DEC 27, 11:02 PM
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| quote | Originally posted by skywurz:
not at 1psi - the engines demand for air. The way volvo is doing it as a stopgap for turbo lag is an interesting idea. however you can get way more out of a Fiero for 2500 like a second Fiero
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I don't know why you are locked in at 1 psi. The compressor map says that it does much more than that at intermediate air flows that are characteristic of mid range RPMs. ------------------
formerly known as sanderson
1984 Quad 4
1886 SE 2.8L
1988 4.9L Cadillac
1988 3800 Supercharged
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skywurz
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DEC 27, 11:22 PM
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sanderson231
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DEC 27, 11:31 PM
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| quote | Originally posted by skywurz:
look at the video |
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look at the compressor map
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formerly known as sanderson
1984 Quad 4
1886 SE 2.8L
1988 4.9L Cadillac
1988 3800 Supercharged
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skywurz
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DEC 28, 01:05 AM
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I did and you are getting a whopping 330cfm
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sanderson231
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DEC 28, 12:59 PM
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Ok, I watched the video. This test was done with the discharge unrestricted allowing the compressor to run way out on the curve with a flow of 23 lbs/min. A 2.8L at 4000 rpm needs 10.8 lbs/min. If you look at the compressor curve that PMBrunelle posted the compression ratio at 10.8 lbs/min is 1.35:1. This equates to 5 psi of boost. That's enough to make a meaningful difference in acceleration. And you get even more boost at lower RPMs.
The point of this technology is not to add top end power. It adds low and mid-range power. That is why Volvo coupled an electric supercharger with a turbo. The electirc supercharger provides low end power which the turbo lacks and the turbo takes over when the electric supercharger is starting to fall off the curve.
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formerly known as sanderson
1984 Quad 4
1886 SE 2.8L
1988 4.9L Cadillac
1988 3800 Supercharged
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sanderson231
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FEB 16, 11:44 AM
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For those interested in the electric supercharger the following forum has cutting edge work being done:
https://www.electrifiedboos...eboost-tech-forum.7/
For a engine about the size of a 2.8L this is what it would take to have 10 psi of boost throughout the rpm band:
Rotrex C15-60 centrifugal supercharger
NeuMotor 8057 10 kW brushless DC motor
McMaster Carr 10,000 rpm rated coupling
APD Pro electronic speed controller (ESC)
40Ah 17S2P LiFePO4 pouch battery pack
Battery equalizer
12V to 110 V inverter
110V to 48V battery charger
Arduino Nano microcontroller
This would provide for repeated 15 second WOT throttle runs.
Total cost of above is about $4500 (all high quality new). Cost would be less if the compressor from a turbo could re-purposed. Better ESC and battery options may bring the cost down.
Unlike a turbo this provides boost throughout the rpm range and installation is easier. An electri8cally driven supercharger avoids the parasitic power loss from a belt driven supercharger which would be 15 hp if the Rotrex was belt driven and probably more for an Eaton positive displacement blower.
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formerly known as sanderson
1984 Quad 4
1886 SE 2.8L
1988 4.9L Cadillac
1988 3800 Supercharged
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