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Old 09-11-2019, 12:08 PM   #1
GothamDrew
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Default 2019 STI Dyno Vs. 2018 STI Dyno

Has anyone ever seen back to back dyno results of a 2018 STI compared to the 2019 to understand how the new 2019 tune is different?

Thanks!
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Old 09-11-2019, 02:58 PM   #2
wrxlaunch
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Old 09-12-2019, 11:35 AM   #3
GothamDrew
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Originally Posted by wrxlaunch View Post
Thanks. I didn't notice any dyno graphs on here. Did I miss it?
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Old 09-17-2019, 08:23 PM   #4
WRXnick16
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I haven't seen any back to back dyno comparisons (ie same dyno, same day). You could reach out to Cobb to see if they have any comparisons. This is all that I could find from Cobb regarding the Type RA/'19+ STI tune:
Quote:
COBB Tuning – Subaru WRX STI Type RA Accessport and Parts
The Type RA is loaded with a much more aggressive tune than we are used to seeing from Subaru. In fact, on ACN91 octane fuel the car was seeing enough knock to shut off the boost control system completely. Using higher quality fuel (93 Octane) we did see much more consistent power out of the Type RA however it is still leaning fairly hard on the knock detection system – with hits of 4 degrees seen relatively consistently. With that said, our internal calibration team was still able to find a bit of power, specifically in the mid-range, which can be realized in our Stage 1 Off The Shelf Maps. By using a different tuning strategy, we were also able to mitigate the concerning levels of knock. This makes for noticeable gains and peace of mind, especially for those using ACN91 fuel.

The factory calibration essentially starts with higher base timing values and the knock system rarely allows it to fully take advantage of dynamic advance. Our calibrations will start at a slightly lower base value with a higher allowance of dynamic advance. It’s not necessarily disastrous for longevity as the knock correction system is indeed doing its job. Our approach is to not lean on that system as hard as the factory calibration does.
Based on this, I'm speculating that there's little power gain on the '19 tune with 91 since it can't take advantage of the extra timing.

The video below talks about the OEM tune being more aggressive on the '18 STI than previous years. They mention the OEM tune leaning out in higher RPMs (above 5,400rpm) and pulling timing. Cobb's map runs a bit richer to avoid this.


The '18 & '19 STI should be fairly comparable with a stage 1 tune. The revised intake, exhaust, and 3rd gear may provide a slight edge to the 2019.
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Old 09-18-2019, 08:04 AM   #5
GothamDrew
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Originally Posted by WRXnick16 View Post
I haven't seen any back to back dyno comparisons (ie same dyno, same day). You could reach out to Cobb to see if they have any comparisons. This is all that I could find from Cobb regarding the Type RA/'19+ STI tune:

Based on this, I'm speculating that there's little power gain on the '19 tune with 91 since it can't take advantage of the extra timing.

The video below talks about the OEM tune being more aggressive on the '18 STI than previous years. They mention the OEM tune leaning out in higher RPMs (above 5,400rpm) and pulling timing. Cobb's map runs a bit richer to avoid this.

2018 STI Baseline and Cobb Stage 1 Data on the Dyno - YouTube

The '18 & '19 STI should be fairly comparable with a stage 1 tune. The revised intake, exhaust, and 3rd gear may provide a slight edge to the 2019.
Thanks a lot!
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