Electric water pump

[Ashikabi]

Originally Posted by churchx

Hmm .. IRL it might be less of an issue, as imho many that do that extensive mods may also run aftermarket ECU, such as Motec. Still, main bit i wanted to point out in my post, that no magic energy will be freed by going electric, thus no performance gains are to be expected.

I'm not certain that's accurate. Probably more of, less power than originally thought. Which isn't much. But I know the v8 guys like their electric water pumps. I certainly wouldn't spend the money on it as a power adder though

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[Calum]

Originally Posted by churchx

Only with extra safeguards in place. Think of what happens if battery is drained almost completely by pump and not charged at normal rate. If you stop engine, you will not be able start back again, once charge is drained .. waterpump may stop working completely. And no battery likes deep discharges, which usually reduce maximum charge it may hold, so soon battery will need to be changed. And if/when (at very late stage) alternator/generator is told to charge back as much as they can emptied battery, "power sap" will be much greater. Now throw in lightweight reduced capacity battery.
Mechanical direct driven pump sounds more fail-safe to me, which seems important bit for track (ab)use.

"for brief moments of full throttle. Not really sustainable for racing, but on the street you could gain a solid 3-5hp."

So exactly what I had already said?


There was sufficient efficiency gained by moving from engine drive fans to electric to make it worth it. Same for power steering. Why is it so hard to imagine that not running a water pump all the time could also give similar gains?

[Ashikabi]

Originally Posted by Calum

"for brief moments of full throttle. Not really sustainable for racing, but on the street you could gain a solid 3-5hp."

So exactly what I had already said?


There was sufficient efficiency gained by moving from engine drive fans to electric to make it worth it. Same for power steering. Why is it so hard to imagine that not running a water pump all the time could also give similar gains?

I'm not sure that's why the move to electric fans and PS happened. The electric PS is almost certainly cheaper than a complex hydraulic system. And the electric fans were likely necessary for their increased cooling efficiency and placement flexibility. You can't have a super low hoodline without them.

https://www.streetmusclemag.com/news...r-streetstrip/

This article states that a modern LS engine water pump consumes about 12hp. I'm sure that pump will flow a little more than the BRZs, so let's call it a conservative 8hp. Which would be about 4%. Is that worth 500$+? That's for you to decide. Certainly sounds more promising than a cold air intake though. Could you run 2 cheaper pumps for even more flow? I dunno but it would be worth investigating to the right person.

So there you have it folks. 45 seconds on Google settled the debate. Electric water pumps will save horsepower, albeit a small amount. I suppose if 12hp is worth it for a 500hp motor then 8 should be even more valuable to a 200hp motor.

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[makinen]

Originally Posted by Ashikabi

I'm not sure that's why the move to electric fans and PS happened. The electric PS is almost certainly cheaper than a complex hydraulic system. And the electric fans were likely necessary for their increased cooling efficiency and placement flexibility. You can't have a super low hoodline without them.

https://www.streetmusclemag.com/news...r-streetstrip/

This article states that a modern LS engine water pump consumes about 12hp. I'm sure that pump will flow a little more than the BRZs, so let's call it a conservative 8hp. Which would be about 4%. Is that worth 500$+? That's for you to decide. Certainly sounds more promising than a cold air intake though. Could you run 2 cheaper pumps for even more flow? I dunno but it would be worth investigating to the right person.

So there you have it folks. 45 seconds on Google settled the debate. Electric water pumps will save horsepower, albeit a small amount. I suppose if 12hp is worth it for a 500hp motor then 8 should be even more valuable to a 200hp motor.

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Electric water pump Is way more simpler than electric power steering.
The parasitic losses of mechanical WP, PS and so on are not dependent on engine loads but on RPM. If you make one electric, it will save at all loads and all RPM ranges. CAI will give maximum gain at full throttle and some high RPM only, otherwise, specifically on low load it will give very little.

[Ashikabi]

Originally Posted by makinen

Electric water pump Is way more simpler than electric power steering.

The parasitic losses of mechanical WP, PS and so on are not dependent on engine loads but on RPM. If you make one electric, it will save at all loads and all RPM ranges. CAI will give maximum gain at full throttle and some high RPM only, otherwise, specifically on low load it will give very little.

I disagree that electric water pump is simpler than PS. You haven't eliminated any hoses, just the pulley with the water pump. Electric PS eliminated hoses, hydraulic components in the rack, and possibly a cooler. Not that it really matters. And I mention CAI because they are proven to do next to nothing on this car, where as a water pump will for sure do... Something.

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