EQ - 2010 STI - EQ Stage 2 Block and Heads, ATP GTX3071, TMIC, 91 Octane

[Equilibrium Tuning]

This is a car we built recently. He just finished the break-in and came in for the final tune:


Event: Custom Tune/Dyno
Location: Equilibrium Tuning - Fairfield, CA
Ambient Temp: 75 degrees Fahrenheit
Elevation: ~100ft above sea level

Car: 2010 Subaru STI
Tuner: ED @ Equilibrium Tuning
Peak HP at RPM: 338whp @ 6350RPM
Peak Torque at RPM: 335ft-lbs @ 4200RPM
Target Boost: 20psi
Fuel: Cali 91 Octane

Engine/Power Modifications:

EQ Stage 2 Shortblock
EQ Stage 2 Heads (stock cams and valves)
ATP GTX 3071 Turbo with integrated EWG
Process West TMIC
Perrin 3" Inlet
AMR Big MAF CAI
Tomei UEL Headers + UP
TBE
EQ 1000cc Injectors
Walbro Fuel Pump
EQ Custom Tune on 91 Octane





This is the first experience I've had with the GTX3071. It seems to make similar power to the GT3076 with slightly better spool. On the street we saw 20psi by 3800RPM in 3rd gear. The car drives very nicely and response feels great all around. Next up is 100 octane or E85 .

*** Standard Dyno Chart Disclaimer ***

This dyno reads low and should be compared to the lower reading mustang dynos. Here are some proven numbers and trap speeds for reference:

Stock 02-05 WRX - 155-165whp
Stock 04-07 STI - 215-220whp
Stock 08-11 STI - 190-200whp

265-275whp - 107-108mph traps
300-310whp - 112-113mph traps
325-335whp - 115-116mph traps
350-360whp - 118-120mph traps

Thanks
-- Ed

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[bilt2run]

Finally gtx3071 numbers!! and from a reputable tuner none the less..Just as we all suspected,basically gt30r power curve and nice to see a possible decrease in spool...
nice job again

[reid-o]

Were there diminishing returns as you turned the boost up?
It makes sense that it performs like a 3076. I don't have experience with 91 to know what a reasonable pressure ratio is.
I'd convert from my 3582 if I could get that boost threshold and crack 400 on stock cams on 92.

[Equilibrium Tuning]

Originally Posted by reid-o

Were there diminishing returns as you turned the boost up?
It makes sense that it performs like a 3076. I don't have experience with 91 to know what a reasonable pressure ratio is.
I'd convert from my 3582 if I could get that boost threshold and crack 400 on stock cams on 92.

I generally don't run over 20-21psi on 91 Octane. I'm sure it could have made more with more boost, but timing would have to be a lot lower and EGT's would start to get pretty hot. I don't see any reason this turbo couldn't hit 420-440whp on good gas.

-- Ed

[Kastley85891]

Needs some E to spank that wagon you tuned ;-)

[reid-o]

Originally Posted by Equilibrium Tuning

I generally don't run over 20-21psi on 91 Octane. I'm sure it could have made more with more boost, but timing would have to be a lot lower and EGT's would start to get pretty hot. I don't see any reason this turbo couldn't hit 420-440whp on good gas.

-- Ed

What was timing at peak torque and redline like?
I normally like the bigger turbine wheel, but Im getting older and prefer to shift less.
The gtx3576 is ridiculously priced and is not even being considered.

[b1aze]

Any reason you didnt go rotated? Ive been looking into a rotated setup and keeping the stock sti TMIC and keeping it super conservative till i break cyl4.

[Equilibrium Tuning]

Originally Posted by b1aze

Any reason you didnt go rotated? Ive been looking into a rotated setup and keeping the stock sti TMIC and keeping it super conservative till i break cyl4.

The stock location turbos of this size perform very similarly to the rotated variants. Stock location keeps things simpler and makes it much easier to smog the car.

-- Ed

[Equilibrium Tuning]

Originally Posted by reid-o

What was timing at peak torque and redline like?
I normally like the bigger turbine wheel, but Im getting older and prefer to shift less.
The gtx3576 is ridiculously priced and is not even being considered.

I believe it's runing 10* on spool up to 17* by redline.

Thanks
-- Ed

[Imprezd]

Good to see someone make easy power and just stop. Nice results!

[Schister66]

I've been waiting for a dyno of the GTx3071r. I'm really excited to see the results on E85

[Equilibrium Tuning]

Originally Posted by Imprezd

Good to see someone make easy power and just stop. Nice results!

Thanks!

No point in pushing things beyond the limit on a brand new expensive engine and crappy inconsistent California fuel!

-- Ed

[Drew888]

Ed, any updates? Any chance he'll be back in for an E85 map?

[Equilibrium Tuning]

Only update is that he beat a new Mustang 5.0 with cams, headers, exhaust, intake, and tune... supposedly they do about 500bph with those mods but I have no idea how much it was actually making.

He will need larger injectors for E85 on this turbo. I know he plans on doing it eventually but he's just enjoying this for now.

-- Ed

[jdpsearcher]

On e85 do you think 450-475 is a safe power estimate at the wheels?

[Equilibrium Tuning]

Originally Posted by jdpsearcher

On e85 do you think 450-475 is a safe power estimate at the wheels?

I would expect around 420-430whp on E85 on our dyno... that's nearly 500whp on a Dynojet or other higher reading dynos.

Thanks
-- Ed

[Equilibrium Tuning]

bump... this is the same car in the other thread with E85... It looks like it beat my expectations a bit

-- Ed