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Old 02-24-2021, 07:56 PM   #1
Cianski06
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Default Why do subarus crank so slowly compared to other cars?

Is it a grounding issue? Starter undersized? Battery undersized? Doesn't make sense to me
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Old 02-24-2021, 08:14 PM   #2
murrdogg24
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Quote:
Originally Posted by Cianski06 View Post
Is it a grounding issue? Starter undersized? Battery undersized? Doesn't make sense to me
what's the problem? it starts doesn't it?
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Old 02-25-2021, 03:16 PM   #3
Mister_G
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Crystal White Pearl

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Quote:
Originally Posted by Cianski06 View Post
Is it a grounding issue? Starter undersized? Battery undersized? Doesn't make sense to me
My 2017 WRX had a bad battery from factory, it would always crank slowly. Got an aftermarket battery and no problems now
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Old 02-26-2021, 01:07 PM   #4
basyager
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cranks fine y u being picky dawg
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Old 02-27-2021, 12:00 PM   #5
Bansheeboy11
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Its a tiny little starter on a tiny little motor lol
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Old 02-27-2021, 01:56 PM   #6
X49
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The stock battery is really small, only 390 cold cranking amps, 48 amp hour. Mine went bad after 2 and a half years. Subaru replaced it under warranty with a 540 CCA 48Ah battery, which works better and has lasted longer so far. When I replace this one, I'm going to try to get an even larger one.

Subaru uses high pressure, high volume oil pumps in their engines which may make cranking more difficult than other vehicles, especially with cold thick oil. This engine flows more oil at higher pressure than your typical V8 engine.

Small batteries charge more slowly, and cold temperatures also reduce charging rates. I have to put a charger on my battery a couple of times per winter to keep the charge up when I'm not driving it enough in cold weather. Check your battery's resting voltage with a multimeter. If it's less much than 12.6V I would put it on a charger.

Edit: If you have an Accessport, you can log the battery voltage while starting too. It should dip down to around 7-8 volts for a fraction of a second, then settle to at least 9.5 volts until it fires. If the voltage is lower than this, either the battery either has a poor charge, or will need to be replaced soon.
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Old 02-28-2021, 08:04 AM   #7
Skeet6
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I never noticed this on my last two Subarus, and both of them went through multiple batteries over their lives - but my most recent used (2016 Impreza bought 11/20) cranked really slow with factory Panasonic. Enough to worry me before a NEPA winter. I replaced it with a NAPA Legend, no more slow cranking.
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