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Old 08-04-2014, 09:39 PM   #1
PhatBotti Tuning TKR
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Default *** Phatbotti Tuning 2015 WRX Ethanol R&D wtih Cobb Tuning & the Cobb AccessPort ***

Event: E-Tuning / Dyno Tuning
Location: California
Ambient Temp: 80
Elevation: 0
Weather: sunny
Car: 2015 WRX
Tuner: Lance Lucas @ Cobb
Tuned With: Cobb APv3
Dyno Info: Mustang-500-SE
Transmission: 6spd
Gear: 4th
Peak HP at RPM: 272whp @ 5800rpm
Peak Torque at RPM: 290tq @ @ 4400rpm
Baseline hp/tq for a stock on same dyno: 207whp/208 wtq (91octane)
Target Boost: 20 psi tapering to 14psi
Target AFR: 11.3-11.5
Fuel: e40 (5 gallons of e85 add to half tank of 91oct)

Modifications: Cobb APv3. Everything else is stock

I was pretty disappointed with the stock map on the 2015 WRX. The car is not happy at all on 91 octane and has never achieved an IAM of 1.0 when I've been logging. It's basically down 6-12* below full advance over the entire WOT powerband and had some very pronounced hesitations. At first I thought the hesitations were due to the erratic boost control, but with the addition of ethanol on the stock tune the hesiations went away almost entirely.

I have already been running the car for 2 months on varying levels of e-85 mixed with 91octane on the stock tune so Cobb saw a good opportunity to get some preliminary ethanol data without having to dive right into full e85.

We worked with Lance Lucas who is the lead Subaru calibrator at Cobb who basically e-tuned the car while we had it on the dyno.

And since I haven't made any PPB threads about my dyno facility in Anaheim here are some pretty pictures.







Now onto the data. e40 vs stock car on 91octane



e40 4th gear pull with boost and afr



The car is a whole different animal on good gas. We may have some full e85 data soon if Lance is down to play again.
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Last edited by PhatBotti Tuning TKR; 08-04-2014 at 09:58 PM.
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Old 08-04-2014, 09:42 PM   #2
PhatBotti Tuning TKR
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One of the best things about the new WRX is all the additional sensors and logging parameters that are available.

Here's 3rd v 4th gear



Catalyst Temp.....it is not fully understood yet, but can partially be used as an EGT. The data seems to support the EGT's dropping as timing was added back in over the course of the tune.



Various temperatures. Post intercooler temp is now available.



Fuel Pressure



MAF voltage



Volks


Last edited by PhatBotti Tuning TKR; 08-04-2014 at 09:51 PM.
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Old 08-04-2014, 09:51 PM   #3
juanmedina
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Very nice! Ron is your dyno setup to read like a dynojet? Is the car 100% stock as far as power mods?

I can't wait yo see what it makes on E85
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Old 08-04-2014, 09:56 PM   #4
PhatBotti Tuning TKR
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I haven't touched anything (weather station, roller size/weight) that would effect the readings. Its setup the way mustang set it up. All the other mustang plots I've seen of the 15 wrx have been significantly higher than mine.....

Car is 100% stock.
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Old 08-04-2014, 11:25 PM   #5
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Nice numbers! The magic of a good tune/Good gas..

I wonder what you could get out of a tune with just pump and 100 % stock.
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Old 08-04-2014, 11:32 PM   #6
PhatBotti Tuning TKR
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^ cobb has stage 1 pump gas graphs up in ppb I believe, along with 3-4 other companies. if they aren't there, they're in cobbs dyno database
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Old 08-04-2014, 11:34 PM   #7
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Yea they have there OTS maps,But those aren't aggressive.. There conservative
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Old 08-04-2014, 11:43 PM   #8
PhatBotti Tuning TKR
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It's going to be hard to be aggressive on these cars.....just like the 08+ wrx. The crappy intercoolers split open....and the efficiency is not very good for higher than stock boost levels. You can see how high the charge temp (post intercooler temp) is getting.

Our intercooler was already bulging the tabs and we had to tap them back into place.
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Old 08-05-2014, 01:59 AM   #9
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^One of the tricks us legacy gt guys used to pull back in 05 was putting a self tightening metal band around the intercooler. Or you could buy a perrin LGT(08-13wrx) intercooler and fab a mounting point since turbo is no longer behind the motor.
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Old 08-05-2014, 10:32 AM   #10
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Nice data! Can't wait to see more
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Old 08-05-2014, 11:16 AM   #11
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I guess a Front mount or upgraded Top mount is necessary then. Especially if its struggling with the small stock turbo smh.
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Old 08-05-2014, 11:39 AM   #12
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In for more info, with full E85 especially. I think now would be a good time for Cobb to start working on a FlexFuel solution. With OEM injectors flowing enough, I think it would be more appealing to many out there with E85 available but not as convenient as in the Midwest for example.

Best dyno-cell I have seen by the way!
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Old 08-05-2014, 11:43 AM   #13
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Quote:
Originally Posted by Karb0n View Post
I guess a Front mount or upgraded Top mount is necessary then. Especially if its struggling with the small stock turbo smh.
The intercoolers have really sucked on Subarus for awhile with the plastic endtank design and tabs... old news
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Old 08-05-2014, 11:51 AM   #14
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Subscribed! Can't wait to see more e85 results.

Also good to hear you're located in Anaheim Phatbotti. Maybe I'll be taking my 2015 when I get tuned to you haha.
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Old 08-05-2014, 12:07 PM   #15
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Quote:
Originally Posted by Ultimateone View Post
The intercoolers have really sucked on Subarus for awhile with the plastic endtank design and tabs... old news
So i've heard! Thought maybe on the 15 it would be a little bit stronger I plan on a Front mount anyways,But not in till turbo kits are released.
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Old 08-05-2014, 12:56 PM   #16
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Wow talk about good tuning! The baseline was low but the end result is real nice.

Subscribed for more e85 mixes and full.
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Old 08-05-2014, 01:23 PM   #17
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Very interesting results. Adding 50% E85 on our 15 netted about 10 ftlbs and 7 whp. Essentially nothing. We seem to have a car that does not respond well to it.

Tony
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Old 08-05-2014, 01:28 PM   #18
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Quote:
Originally Posted by Turn in Concepts View Post
Very interesting results. Adding 50% E85 on our 15 netted about 10 ftlbs and 7 whp. Essentially nothing. We seem to have a car that does not respond well to it.

Tony
Maybe you guys have better 91oct available vs Ron's cali 91? He said his DAM was always less than 1.0, I bet you guys saw full timing.
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Old 08-05-2014, 01:33 PM   #19
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Our 93 is pretty good out here that's for sure. 94 as well is still available in some places.

DAM was always 1 with the stock tune. The e50 leaned out the mixture quite heavily, but did't do anything for power or torque.

Tony
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Old 08-05-2014, 01:33 PM   #20
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California, Nevada and Arizona have the crap 91 oct
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Old 08-05-2014, 02:01 PM   #21
wgr73
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Quote:
Originally Posted by Turn in Concepts View Post
Our 93 is pretty good out here that's for sure. 94 as well is still available in some places.

DAM was always 1 with the stock tune. The e50 leaned out the mixture quite heavily, but did't do anything for power or torque.

Tony
Sweet Tony. A lot of us envy you guys with good gas

Hmmm, interesting.
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Old 08-05-2014, 02:37 PM   #22
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Quote:
Originally Posted by Turn in Concepts View Post
Very interesting results. Adding 50% E85 on our 15 netted about 10 ftlbs and 7 whp. Essentially nothing. We seem to have a car that does not respond well to it.

Tony
Lots of the power comes from getting the timing back in the car. As I stated earlier the DAM was never 1.0 on 91 oct....at least not when I was logging it.

Here is a graph of the timing on 91octane vs 91oct with 3-4 gallons of e85 in the tank. You can see the car is missing 6-12* of timing on 91 octane. These plots are on the stock tune from before I had the AP.

There is some interesting logic in the 15wrx with respect to the knock strategy. From the testing I did, my theory is that the DAM resets to 0.6875 every time you start the car UNLESS the DAM reaches 1. I tested this multiple times where I went out and let the DAM step up 1 step, then shut off the car. Each time it was reset to 0.6785. The highest I could get it was 0.9125 and it still reset when I shut off the car. Everyone on 93 has reported that there IAM stays at 1.0 constantly.


Last edited by Phatron; 08-05-2014 at 02:44 PM.
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Old 08-06-2014, 12:01 PM   #23
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Now that you have access to a proper post intercooler temperature, what use is the pre-intercooler temperature beyond determining how insufficient the stocker is?
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Old 08-06-2014, 12:17 PM   #24
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Quote:
Originally Posted by phantomfozzy View Post
Now that you have access to a proper post intercooler temperature, what use is the pre-intercooler temperature beyond determining how insufficient the stocker is?

You can accurately tune the timing vs Post TMIC temp table (IDK what it is called, but I assume it is there).
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Old 08-06-2014, 07:42 PM   #25
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Quote:
Originally Posted by LittleBlueGT View Post
You can accurately tune the timing vs Post TMIC temp table (IDK what it is called, but I assume it is there).
I was asking if they had found any use for the normal pre-intercooler temp sensor since the one that's closer to the throttle body is better.
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