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Old 07-05-2019, 10:42 PM   #1
Scooby Newbie
Member#: 503963
Join Date: Jul 2019
Default WOT @ low RPMs - harmful, but where does it say this?

Looking into getting my first Subaru - a WRX. Been reading over the doomsday scenarios talking about ring land, detonation, etc...

My takeaway is that this doesn't appear to affect the FA20 much, if at all. But to "be on the safe side," I've seen more than one person reference the owner's manual as a source advising against WOT @ low RPMs ("~3,500"). I spent a good amount of time trying to find where it says this and cannot. Does anyone know where it says this?


Also, what's with the oil capacity for the FA20 being nearly one quart more than the EJ25 (5.4 vs. 4.5)?
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Old 07-05-2019, 11:12 PM   #2
Scooby Guru
Member#: 22412
Join Date: Aug 2002
Chapter/Region: SWIC
Location: Albuquerque, NM
2012 Legacy 2.5GT
Ice Silver Metallic


I think the main concern is being at high boost at low RPM while under load, which is probably why Subaru limits boost in first and second where you could have low rpm and a high load while taking off. So maybe less of a concern on the stock tune, but a bigger issue if you get an AP or something like that which removes that limitation.

The oil capacity was likely increased mainly due to the timing chain on the FA20 vs. the timing belt in the EJ25.
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Old 07-07-2019, 02:44 AM   #3
Scooby Specialist
Member#: 89283
Join Date: Jun 2005
Chapter/Region: Tri-State
Location: Queens, NYC
2017 WRX Premium


1 of the issues is Low Speed Pre-Ignition, LSPI. As mentioned, low engine speeds, high boost, high cylinder pressure, high load.
As far as low RPM, 3500 is prob safe enough.... issues come up when we're talking 6th gear 60MPH, floor it.... a lot.
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