Just pursuing some other interests (flying & Photography) & I'm enjoying a month off between jobs.

More to be done on my STi next year, the job I've just left had left me fed up with cars/automotive in general.

I'll swing past this week & say g'day.

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Thank you P.WRX for your continual support.

We have been working on a lot of MY08 - MY11 Imprezas of late and I will post some data that I hope will be helpful to P.WRX members modding their late model Imprezas.
I also thought this would be appropriate before posting the tune on Jon's MY11.

After the recent number of tunes of the current model Imprezas, we have found that the stock solenoid is inadequate for a flash tune as it does not allow boost to hold well. Also, plumbing an aftermarket boost solenoid correctly is very important.

Other than the turbo back exhaust, cold air intakes, headers and larger intercoolers also contribute to the overall performance and power gains from flash tunes on the late model Rexes.

Below is data on a soft tune on GR STi. The car came in with a Butler exhaust which gave it a max of 1.05 bar of boost. Everything else was bone stock. Vehicle hit 224hp on the power run before tuning.

PLS NOTE: This tune is unfinished. We are awaiting further mods to be done on this vehicle to complete the tune.

Soft tune on the stock 2008 GR STi with ineffective stock boost control when flashed 1.35bar of boost --- in this instance an aftermarket solenoid is recommended for the STi to hold high boost:


Even with minor tweaking of the ignition tables and fuel tables, we can see how easy it is to gain power on the new STis even with less than 1 bar of boost.

Also, as mentioned before and relevant for MY08-MY11, the below are the boost curves from Iceken's tune.

Boost curve with air intake and exhaust as it came in:


Boost curve with headers, top mount and front pipe fitted (Also included is test boost tuning which at one stage achieved 275hp):


Reduction in boost to achieve 268hp safely with proper AFR and good ignition timing:

We just did a power run on a P.WRX WRP10.

Below is an impresive power run maxing at 203hp on a stock WRP10:

Hi Mao,

Sorry to chime in so late into this thread..

Umm dare i ask whats happening around the 4000rpm mark and also at top end around the 6250 mark?

Some awful valleys in that region..

As per the power run of the factory-tuned WRP10:

4000rpm: In this instance the vehicle overboosted slightly above one bar and stock ecu was pulling back the boost quickly.
6250rpm: Boost weening low and car running out of power and torque on a typical unmodded WRX towards the higher rpm.

In factory tunes, Subarus are set such that you will feel the initial pull at lower rpms and then boost is taken off quickly higher up. This gives the customer an initial boost/pull sensation, while keeping the engine very safe.

Sorry Mao, i should have been more specific.

I was inquiring about the MY08-MY11 tune on the first couple of pictures.

If that's power after a tuned run.. it seems to mimic the original factory tune, have you adjusted anything else?

Just wondering if you can submit a few more in-depth reasoning, cause something in my mind doesn't add up.

Hi Intra,

If you don't mind, please read the thread again.

As stated, tune is unfinished due to lack of couple of items needed like the boost solenoid to control high boost. This can be seen in the boost curve.

Tks.

jesus,

did that have an exhaust and an intake?
or actually bone stock?

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Hi Mao,

Thanks for pointing me to the "fine print", i notice that boost comes up on song about 3400RPM which is granted. However you see quite a sudden drop which follows that is caused by a PID compensation map.

Subaru boost control works like this..

1. Lookup target.
2. Use initial duty
3. Check pressure
4. Apply conditions ( IS pressure above or below target)
5. Based on condition apply burst until max duty limit
6. Target met.. apply integral to maintain pressure
7. Repeat from start

Logically one would assume that if the stock boost controller could not control 18 pound of boost that you'll see a almost linear decline on the MAP as the actuator is swung wide open to bypass exhaust gas.

What wastegate duties are you running?