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Author Topic: race alternators  (Read 2647 times)

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Janspeedcapri

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race alternators
« on: June 30, 2009, 18:54:00 PM »
Been looking at "race alternators" that weigh  2.5, 4.5 and 5kg and are rated 50, 80 or 130 amps.

The car has electric power steering, electric cooling fans, electric waterpump,bmw e36 hid lights and several electronic boxes for ignition and fuel management.
Would the lightest 2.5 kg 50 amp one be o.k? There isn't much cost difference but the 130 amp one weighs twice as much as the 50 amp one.



Offline cossiemk2

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race alternators
« Reply #1 on: June 30, 2009, 21:04:27 PM »
EPS 60 amps on full lock!
Fans 25/30 amps?
Waterpump 20 amps?
+ lighting etc 20/25 amps

You do the math mate.

Offline TwinTurbo

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« Reply #2 on: June 30, 2009, 21:24:55 PM »
waterpump won't take 20 amps...

And unless you sit on full lock your not going to be drawing the full amps on the power steering.. Fans won't run constantly either.

And lights not on either.......


So if your doing full lock donughts in high ambient temps at nighttime then 130 would be deffo...

Normal mixed driving would probably manage on the 80A although sierras came with 90A on the XR4x4 and Ghias ( for the twin heated screens etc,.. )

TT

Offline TwinTurbo

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« Reply #3 on: June 30, 2009, 21:29:38 PM »
Davies Craig draws 7.5A max and that's with a voltage range of 4-14.5V so you will be looking at a draw of arround 2.3A from that.

http://www.daviescraig.com.au/Electric_Water_Pumps-EWP80__12V__ELECTRIC_WATER_PUMP___PART_No__8005-details.aspx]http://www.daviescraig.com.au/Electric_Wat...05-details.aspx


Offline Jeroen

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« Reply #4 on: July 01, 2009, 14:20:35 PM »
80A would be a good compromise I think. If the alternator cannot supply enough current for a while, the battery will supply it. Maybe you offset the extra weight with a smaller battery.

Janspeedcapri

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race alternators
« Reply #5 on: July 01, 2009, 19:36:09 PM »
Quote from: TwinTurbo
Davies Craig draws 7.5A max and that's with a voltage range of 4-14.5V so you will be looking at a draw of arround 2.3A from that.

http://www.daviescraig.com.au/Electric_Water_Pumps-EWP80__12V__ELECTRIC_WATER_PUMP___PART_No__8005-details.aspx]http://www.daviescraig.com.au/Electric_Wat...05-details.aspx

The daviescraig is what ive been looking at as it goes. Cheers

Quote from: Jeroen
80A would be a good compromise I think. If the alternator cannot supply enough current for a while, the battery will supply it. Maybe you offset the extra weight with a smaller battery.
That sounds logical plan   Thanks


Offline Jeroen

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« Reply #6 on: July 01, 2009, 19:55:56 PM »
Is there really an advantage in using an electric water pump? I don't believe no shit of the marketing fluff that it can free up to 20 bhp. It might free some (fractional) horses but only if it's not supplied by the alternator. Even then, the energy from the battery ultimately comes from the fuel

Offline TwinTurbo

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« Reply #7 on: July 01, 2009, 20:31:55 PM »
If you use the controller then yes as it can shut down the pump or take it to low flow, this reduces the load on the alternator and does increase BHP. you can benefit from lower consuption with quicker warm up. And by adjusting flow either run the engine hotter or cooler for power/eficenct tradeoffs.


I would think the benefit may be marginal without the controler.

TT

Offline capri v8 driver

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« Reply #8 on: July 01, 2009, 20:32:54 PM »
during dyno test with v8 and the electric water pump, they saw a big increase off hp and torque and the water temp and flow was more stable.

there are some drawbacks, if the pump or the electrics fails, the engine overheats very fast. with a normale pump you can replace the belt, with a electric pump, your only option is to replace the failed pump. a other problem was to make a pump that lived as long as a normale water pump. and these pumps use electric power, so you need a heavy altenator.

but the electric water pumps are getting better.

greetz Paul.

Capri V8 Driver.

Janspeedcapri

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race alternators
« Reply #9 on: July 01, 2009, 23:00:38 PM »
The makers of the kit I'm going for say that the optimum flow rate is acheived with far less energy because engine driven pumps pump too fast at high rpm (and too slow at low rpm). As TT says, they do a controller to keep the flow rate optimum (which I WILL be getting), and it requires a lot less power, wherever that power comes from.

As for why I'm going nuts about electrical ancillaries, I dunno... i started wiv wanting to get rid of the powersteering pump and Ive just got the leccy bug now... the engine will look quite different to most with only one belt on it

btw, I weighed my old and new powersteering setups and the std capri setup is about 15kg heavier than the EPAS setup. AND that weight comes off the front crossmember (rack is 10kg lighter) and from above and infront of the engine (powersteering pump) . The motorised column is only slightly heavier than the std item too.

Offline TwinTurbo

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« Reply #10 on: July 02, 2009, 22:03:20 PM »
Fit an electric powered alternator and you can ditch that last belt.

TT

Offline Tony

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race alternators
« Reply #11 on: July 02, 2009, 23:15:42 PM »
i wouldnt bother with race alternator,,
 i would switch the blue wire on the alternator,, this would open the circuit on wide open throttle,, this unloads the alternator and runs the car on battery, cuts the load right down!!!!
could even use an air con clutch to shut it off!!


the 24v xr4i auto-0 to 60 in 6.71 secs

Offline Jeroen

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« Reply #12 on: July 02, 2009, 23:26:12 PM »
There is an little control box that can turn off the alternator at WOT.

Janspeedcapri

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race alternators
« Reply #13 on: July 02, 2009, 23:34:43 PM »
Quote from: maddoldbugger
i wouldnt bother with race alternator,,
 i would switch the blue wire on the alternator,, this would open the circuit on wide open throttle,, this unloads the alternator and runs the car on battery, cuts the load right down!!!!
could even use an air con clutch to shut it off!!

interesting. the race alternators are just lighter is all, but i could use the same trick to bypass it at high rpm couldn't I? ...the clutch sounds heavy and complicated but cool none the less.

TT - ha fooking ha  


jeroen - got a link??

Offline Jeroen

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« Reply #14 on: July 02, 2009, 23:38:03 PM »
Sorry no link  I found it years ago by accident while surfing the web  and I can't remember which site it was. One selling all kinds of race stuff and electronic injection things.

Janspeedcapri

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race alternators
« Reply #15 on: July 03, 2009, 00:22:30 AM »
probably a good thing... ive spent FAR too much already

Offline mouldytbags

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« Reply #16 on: July 03, 2009, 12:36:01 PM »
just go on a diet for a month and shed a couple of pounds,you will save money in food and no need for the alternator,also another cost saver.

 

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