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Old 07-05-2022, 12:44 PM   #1
mems3
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Member#: 188617
Join Date: Sep 2008
Chapter/Region: PRSIC
Location: San Juan, Puerto Rico
Vehicle:
2008 WRX Sedan
OBP

Exclamation Max Boost PSI for 2018 WRX

Greetings,

I previously owned a 2008 WRX and now I just purchased a used 2018 WRX. The new WRX has an upgraded intercooler and that appears to be all the upgrades.

The car has a digital display that reads out the turbo boost PSI. Ive been reading that WRX's usually have top boost from 16 to 18 PSI. My WRX has been hitting a top boost of 22 - 23 PSI.

I want to know if this is normal for the 2018 WRX or if this is an indication that the car is modded.

Supporting question is that I really want to keep the engine in a safe zone as far as boost is concerned. Is 23 PSI too much boost? can I hurt the engine?
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Old 07-05-2022, 01:49 PM   #2
rtv900
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Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:
2016 STI

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I didn't have the wrx but I think 23 is higher than stock
you can definitely hurt the engine boosting too high, totally depends on the setup
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Old 07-05-2022, 01:49 PM   #3
rtv900
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I didn't have the wrx but I think 23 is higher than stock
you can definitely hurt the engine boosting too high, totally depends on the setup
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Old 07-05-2022, 01:57 PM   #4
timpala11
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Member#: 512891
Join Date: Mar 2020
Chapter/Region: Tri-State
Location: Philly
Vehicle:
2010 STi/21 Passport
RIP 19 WRX & 16 FXT

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That's just a spike that is seen for less than a second, but it still reads as "peak boost." I was tuned for 19 psi but the gauge still displayed "peak" at 22-23 after the fact (resetting it and all).
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Old 07-05-2022, 02:26 PM   #5
lefty o
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Member#: 512654
Join Date: Mar 2020
Vehicle:
2019 wrx
red

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its just registering the momentary peak . my 2019 reads 21-22psi as peak boost.
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Old 07-06-2022, 12:11 PM   #6
shankmeyster
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Member#: 527832
Join Date: Dec 2021
Chapter/Region: SWIC
Location: AZ
Vehicle:
2021 WRX
WRB

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I also see 21-22 peak on my 21.
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Old 07-07-2022, 06:47 AM   #7
wblandon0415
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Default Boost spike

My 19 wrx is pro-tuned on e60 and peak boost is set between 21-22 psi. I had a “good air day” a few weeks ago and my car spiked at 23.3 psi when I got on it. The car went into limp mode and scared the day-lights out of me. So I agree that an extra 1-2psi could hurt the motor when it’s not suppose to be running in that boost range.
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Old 07-07-2022, 06:58 AM   #8
wblandon0415
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Default Boost spike

My 19 wrx is pro-tuned on e60 and peak boost is set between 21-22 psi. I had a “good air day” a few weeks ago and my car spiked at 23.3 psi when I got on it. The car went into limp mode and scared the day-lights out of me. So I agree that an extra 1-2psi could hurt the motor when it’s not suppose to be running in that boost range.
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