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Old 10-27-2020, 12:09 PM   #51
jcb-memphis
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Member#: 461117
Join Date: Jan 2017
Chapter/Region: MAIC
Location: Gaithersburg, MD
Vehicle:
2019 STI
Lapis

Default Possible good news thought - ra/2019+ has 400 to the crank stock?

Given the data in the link in my original post, stock 2019's seem to put to the wheels about 270-280hp. Call it 275.

Stock. That is of course a function of the dyno - but what does that mean is at the wheels?

Is there a 30% loss?

310hp (public spec) suggests only a 10% loss...I don't think that is possible across an AWD system, even one as good as the STI's. Sort of like the 22b having 279hp.....um, right. (Thank you SUBARU!!!)

I suspect it is about 30%. (please comment)

Does that mean that at the crank the stock car (2019) is making

about 400 hp?

That is actually pretty impressive to me at least. With a warranty. The post RA ej257 may be the best one to get and (perhaps) a long term gem....no DI issues with carbon....something I worry about if they don't mix port injection into the new FA sti ..., and if left stock these cars are quite reliable.

It sort of would make sense that Subaru would pick a number they feel is top of the reliable for 99.9% of cars to sell to avoid warranty costs/exposure.


Does that seem reasonable?

Sort of makes one think happy thoughts during the fun times....

jcb

PS: the 2015's seem to be about 245 to the wheels....so about 350 at the crank.


Quote:
Originally Posted by jcb-memphis View Post
So, I went to the COBB website, downloaded the pre-19 power maps and the RA/19 power maps. Digitized the stock (lowest curve) map data for HP and torque. Have no idea if the two situations are comparible (car, temp, gear, etc.). But, I hope COBB is semi-rigorous and controls for things in that manner...probably not...but I plotted them against each other in a format one can understand. Torque is lines (see how I clicked backwards once....sorry) and dots are HP.

Per my seat of the pants feel and others', the 19 seems to have gotten a stage 1 upgrade of sorts. Makes sense since they have a 2.4T in the outback now and one doesn't want an outback to have more hp/tq than the STI halo car....my 2c opinion only.


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Last edited by jcb-memphis; 10-27-2020 at 12:33 PM.
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Old 10-27-2020, 12:41 PM   #52
BlackFighter
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Member#: 193940
Join Date: Nov 2008
Location: Philly
Vehicle:
2004 WRX STI Black
RalliSpec Shortblock

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Quote:
I'll be source for a owner of a 19 sti that blew up his motor. My issues in particular with the car alone... had an issue with stock engine mount coming undone while normal driving and took off from a stop light and heard a wonderful sounding thud... turns out motor slammed hood from leaning back with nothing stopping. Then I went stage 2 cobb for about a 1000 miles no issues. Got bored went full e85 protune from a shop that will remain nameless maybe my experience was a one off. They installed the wrong fuel pump it fell out of the mounts. Left me stranded. Found out wrong fuel pump was just forced in place. Replaced fuel pump and rubber pieces were forgotten so the fuel pump didn't seal correctly and caused me to run lean. Fixed third time by me instead didnt trust the shop. Fast forward 2 monthes of fueling related oddities data logs trial and error. Decided to have it looked at by a different shop who said it was fine. Week later a misfire developed at idle with some really bad fbk and fkl to the point of not being about to drive the car at all. Decided to take it to a different shop to have them look at it. They did a compression leakdown test. Cylinder 4 was the issue 60psi cylinder 1-3 135psi
You actually might have a case. Looks like due to shops negligence by installing the wrong part and installing it incorrectly caused you to run lean, have some miss fires and crack a ringland.
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Old 10-31-2020, 08:37 AM   #53
CoronaWRX
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Member#: 431618
Join Date: Oct 2015
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Location: Virgina
Default

Quote:
Originally Posted by jcb-memphis View Post
Given the data in the link in my original post, stock 2019's seem to put to the wheels about 270-280hp. Call it 275.

Stock. That is of course a function of the dyno - but what does that mean is at the wheels?

Is there a 30% loss?

310hp (public spec) suggests only a 10% loss...I don't think that is possible across an AWD system, even one as good as the STI's. Sort of like the 22b having 279hp.....um, right. (Thank you SUBARU!!!)

I suspect it is about 30%. (please comment)

Does that mean that at the crank the stock car (2019) is making

about 400 hp?

That is actually pretty impressive to me at least. With a warranty. The post RA ej257 may be the best one to get and (perhaps) a long term gem....no DI issues with carbon....something I worry about if they don't mix port injection into the new FA sti ..., and if left stock these cars are quite reliable.

It sort of would make sense that Subaru would pick a number they feel is top of the reliable for 99.9% of cars to sell to avoid warranty costs/exposure.


Does that seem reasonable?

Sort of makes one think happy thoughts during the fun times....

jcb

PS: the 2015's seem to be about 245 to the wheels....so about 350 at the crank.
I would love for this to be the case, but how do you explain the slower numbers when compared to the 2015 STI?


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Old 10-31-2020, 11:44 AM   #54
JP Chestnut
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^^ it seems like **** tuning in first and second gear might be to blame. Savageese talks about how the terrible tuning kills power in 1st and 2nd but magically pulls hard in 3rd. He mentions it in his series.white sti review.

Of course, someone will nonsensically mention the heavier wheels, but that’s not going to cause a roughly .5 second increase in 0-60 and 5-60 rolling.
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Old 10-31-2020, 02:33 PM   #55
CoronaWRX
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Quote:
Originally Posted by JP Chestnut View Post
^^ it seems like **** tuning in first and second gear might be to blame. Savageese talks about how the terrible tuning kills power in 1st and 2nd but magically pulls hard in 3rd. He mentions it in his series.white sti review.

Of course, someone will nonsensically mention the heavier wheels, but that’s not going to cause a roughly .5 second increase in 0-60 and 5-60 rolling.
Interesting and makes sense. Did they change second? I thought it was 3rd gear that was changed. I'd be curious to see the 0-60 numbers of a 2019+ with a pro-tune on stock hardware (no-mods), to see if those issues can be tuned out.
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Old 11-03-2020, 09:09 PM   #56
jcb-memphis
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Lapis

Default

I have 18" forged wheels and michelins......about 9 lbs down per corner.

Savageese makes sense. Perhaps they don't want things to break....

Then 3rd is a train.



So, let's just say the given numbers are correct from the above video: 295hp/305 ft lbs at the wheels....if "only" a 20% loss that means 368hp/381 ft lbs.

AMAZING, thank you Subaru.

Last edited by jcb-memphis; 11-03-2020 at 09:22 PM.
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