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10-15-2018, 04:19 PM | #1 |
Scooby Newbie
Member#: 492742
Join Date: Oct 2018
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2019 WRX Peak Boost change overnight ?
Hey guys, newbie to the NASIOC community, but have always lurked in the shadows figured it was time I JOINED! so what’s up everyone!!
- recently just got a 19’ base WRX it has 400 miles on it currently. - I’m aware of the break in period but still like to get on it a little here and there.. max peak boost of (21-22.3 psi) - recently I swapped out my Halogens for HID’s & the C lights for LED’s.. (Took out the air box) when I put everything back together and went to start the car, I had check engine lights and traction control off, PANIC MODE lol.. I idiotically forgot to plug the MAF sensor back in :/ ... (Didn’t drive car, I shut it off and went to double check my work, plugged the MAF back in & pulled the battery to reset ECU) Once I started it back up, Everything was perfectly fine, all check engine lights etc .. gone. However now my peak boost will never surpass 18.5 psi .. even at WOT (2nd, 3rd pull) I am in NY and the weather has gotten a bit more “Fall -ish” (50-60 degrees) But it seems when I go WOT, the car doesn’t have the same torque band.. doesn’t feel like it did prior to this whole MAF sensor thing.. Any one have any insight ?!?!? Thanks !!
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10-15-2018, 04:23 PM | #2 |
Scooby Guru
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:2016 STI |
my experience is when ECU's are reset, or reflashed the car takes a few days and handful of WOT pulls to work it's way back up to it's peaks.
I think it's designed that way as a safety feature to make sure nothing is wrong so it starts off a tad more conservative and re-learns those peaks again. Plus, when it's colder it will, and should reduce peak boost too. So if you are comparing from a day it was 85 just a week or two ago and now it's 50 in the mornings, that will make a difference, however you should not feel less power if it reducing boost due to colder temps. I'd give it a few days and keep doing some WOT's with whatever octane you use regularly to let it re-learn those peaks |
10-15-2018, 04:31 PM | #3 | |
Scooby Newbie
Member#: 492742
Join Date: Oct 2018
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Quote:
Awesome, ok I will keep an eye on it.. might just be in my head since I’m seeing less on the peak boost ***129335;***127995;****9794;***65039;. Thanks for the response man! |
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10-15-2018, 04:32 PM | #4 |
Scooby Specialist
Member#: 460907
Join Date: Jan 2017
Chapter/Region:
RMIC
Location: Colorado
Vehicle:2020 Golf GTI |
Boost target for your car is 15.9lbs. The tune on the 2015+ DITs make it so there are brief periods of over boost during almost any normal WOT run, it's very brief spikes and it's not sustained for very long at all- just because this run hit 18 and then other run hit 23 doesn't mean one was faster than the other. It's a symptom of the stock tune. As long as your are hitting 16lbs you are hitting target boost.
The reason why the spikes have been less pronounced (18.5 vs 23 PSI) lately is because its colder out. Another symptom of the stock tune is it ties your wastegate duty cycle to your intake temp. Lower temp = lower maximum duty cycle (duty cycle = how much your wastegate opens), high duty cycle = more boost. When the intake temp falls below a certain threshold your WGDC is reduced, which means the car makes less boost. This is done because cold air has more oxygen than hot air, so when it's cold out you can make the same power with less boost. Tl;dr Its tied to temperature, wait until it warms up and your boost will come back. |
10-15-2018, 04:36 PM | #5 | |
Scooby Newbie
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Quote:
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10-15-2018, 04:58 PM | #6 |
Scooby Specialist
Member#: 460907
Join Date: Jan 2017
Chapter/Region:
RMIC
Location: Colorado
Vehicle:2020 Golf GTI |
It's impossible to tell based on that little info... If he was sitting in traffic and his intake was heat soaked then its not going to reduce WGDC nearly as much... There are other factors than intake temp for WGDC, that's just one of the biggest.
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10-15-2018, 05:21 PM | #7 |
Scooby Specialist
Member#: 492327
Join Date: Oct 2018
Location: A car lounge in the midwest
Vehicle:19 WRX 16 STI 17Mk7R 20Supra 20Forester |
My WRX before Cobb Stage1 would peak 22.1psi. After Stage1-plus, 19.2psi so I can see why the op is worried.
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10-15-2018, 06:17 PM | #8 | |
Scooby Newbie
Member#: 492742
Join Date: Oct 2018
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Quote:
He had just gotten off work, car warmed up no traffic, did a WOT, 2nd to 3rd..with me on the phone while he did it loll .... his car has 11,000 miles on it. Bone Stock. |
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10-16-2018, 06:41 AM | #9 | |
Scooby Guru
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:2016 STI |
Quote:
Mine spikes to almost 19 but it never holds 19 for any actual amount of time. It can hold 17.5. You have to do it in a high gear otherwise there's no time for a steady state figure. In my car 2nd and 3rd have way too much power to see what you are holding, the gear just whips through so fast you can't see crap. Do it in 4-6 |
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10-16-2018, 07:05 AM | #10 |
Scooby Newbie
Member#: 472751
Join Date: Aug 2017
Chapter/Region:
NESIC
Location: Woonsocket, RI
Vehicle:2018 WRX WRB |
Break the car in before you start WOT it. There is a reason the Manufacturer has a procedure. Then beat your brand new STI. Must have $$$$ ready for motor failure.
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10-16-2018, 07:21 AM | #11 |
Scooby Specialist
Member#: 492327
Join Date: Oct 2018
Location: A car lounge in the midwest
Vehicle:19 WRX 16 STI 17Mk7R 20Supra 20Forester |
STI and WRX hold different boost levels.
My STI held boost around 15.5psi stock, 17.5+ after stage1. WRX held 22.1psi stock, 19.2 after stage1 plus. |
10-16-2018, 10:32 AM | #12 |
Scooby Specialist
Member#: 295970
Join Date: Sep 2011
Chapter/Region:
Tri-State
Location: Hamilton, NJ
Vehicle:2019 STI CWP |
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10-16-2018, 10:42 AM | #13 |
Scooby Specialist
Member#: 492327
Join Date: Oct 2018
Location: A car lounge in the midwest
Vehicle:19 WRX 16 STI 17Mk7R 20Supra 20Forester |
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10-16-2018, 11:38 AM | #14 | |
Scooby Newbie
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Quote:
So, just to be clear. . I’m talking peak boost. His peak read 22, just like mine did right before the whole MAF sensor debacle... Now mine will peak at 18/19 max ... we both did identical pulls 2nd to 3rd.. I’m not trying to beat on my car here at all.. but it’s noticeably different now. . |
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10-16-2018, 12:06 PM | #15 | |
Scooby Specialist
Member#: 460907
Join Date: Jan 2017
Chapter/Region:
RMIC
Location: Colorado
Vehicle:2020 Golf GTI |
Quote:
OP, of the car truly feels a lot different then take it in to a shop. Just because you're hitting target boost doesn't mean there isn't still a leak or something wrong somewhere else. |
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10-16-2018, 12:21 PM | #16 | |
Scooby Guru
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:2016 STI |
Quote:
The screen will show you the peak that it spikes to, that's it, just the spike highest number. That is NOT the boost your car is actually running at. Any turbo will rapidly increase boost and then the boost control system has to take over as quickly as possible and bleed off exhaust to pull it back down and manage it. If it weren't for this system a turbo would simply boost out of control and shred the motor. Bottom line, forget that number on the screen and don't even look at it. Look at the real time boost number that shows what the car is holding. In my car that's the one on the left, not sure if they've changed it. You have to do a pull in a high gear so it has a chance to get steady and hold a number. The left number is what the car actually runs at. |
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10-16-2018, 12:24 PM | #17 | |
Scooby Newbie
Member#: 492742
Join Date: Oct 2018
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Quote:
I found this on YouTube. This is VERY Similar yo what I am experiencing . |
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10-16-2018, 02:33 PM | #18 | |
Scooby Newbie
Member#: 482358
Join Date: Feb 2018
Chapter/Region:
RMIC
Location: Sandy, UT
Vehicle:2015 WRX Stage2+ Silver |
Quote:
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10-16-2018, 03:42 PM | #19 |
Scooby Newbie
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Chapter/Region:
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Location: Québec
Vehicle:2018 WRX sport, 6MT crystal BLACK silica |
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10-16-2018, 04:11 PM | #20 | |
Scooby Guru
Member#: 428511
Join Date: Aug 2015
Location: philadelphia
Vehicle:2016 STI |
Quote:
That dude was a classic case. He'd just floor it, spike the boost, the control system would back it down for one second before he was off the gas going to shift, super hard to tell where it leveled off. But agreed with the last two comments, that is TOTALLY normal for a turbo car. Every one will spike beyond it's target and then immediately pull back. There is less than nothing to gain from a higher 'spike' than another guy has, it does nothing for performance. If your car is running at your target then you are good to go. So again, I'm not sure you are even confident what you are really running at steady state, the spike is totally meaningless. You need to do this in 5th gear dude where you have a long stretch ahead of you so you can floor it and see where it runs steady. |
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10-16-2018, 05:42 PM | #21 | |
Scooby Specialist
Member#: 460907
Join Date: Jan 2017
Chapter/Region:
RMIC
Location: Colorado
Vehicle:2020 Golf GTI |
Quote:
I feel like this is why more turbo'd cars don't have boost gauges... Hell, half the people on the road have an inability to read a speedometer let alone understand boost pressure... |
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10-16-2018, 07:15 PM | #22 | |
Scooby Specialist
Member#: 492327
Join Date: Oct 2018
Location: A car lounge in the midwest
Vehicle:19 WRX 16 STI 17Mk7R 20Supra 20Forester |
Quote:
It would be silly to assume I am a newb with Subaru's (or turbo cars in general) nor this forum. I just forgot the email I used and its password nearly 2 decades ago when I had the 02 WRX new. |
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10-16-2018, 07:23 PM | #23 | |
Scooby Specialist
Member#: 460907
Join Date: Jan 2017
Chapter/Region:
RMIC
Location: Colorado
Vehicle:2020 Golf GTI |
Quote:
You - "WRX held 22.1psi stock, 19.2 after stage1 plus." Vlad - So your car holds 22psi throughout the rev range? You - Yes, it shows peak boost as 22. Me/rtv - Peak boost is not the same as sustaining boost throughout the rev range. You - I know 'cause I'm not a n00b. Can't make this stuff up. Last edited by GlarryHoodDIT; 10-16-2018 at 07:29 PM. |
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10-16-2018, 07:40 PM | #24 | |
Scooby Specialist
Member#: 492327
Join Date: Oct 2018
Location: A car lounge in the midwest
Vehicle:19 WRX 16 STI 17Mk7R 20Supra 20Forester |
Quote:
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10-16-2018, 07:45 PM | #25 |
Scooby Specialist
Member#: 460907
Join Date: Jan 2017
Chapter/Region:
RMIC
Location: Colorado
Vehicle:2020 Golf GTI |
Danke schoen
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