2007 STi: Stock VF43 with all the bolt-on's

[BG @ BrenTuning]

2007 STi
Stock motor replaced under warranty at 25,xxx miles (when purchased stock, cylinder 3 was already at 80psi) As a side note I make all 2007 STi's get a compression test before I tune them :)

Stock turbo
DW 850
Walbro 255 fuel pump
APS 65mm CAI
Perrin Inlet and After maf hose
Spearco TMIC
Forge UNOS mbc
GT-Spec Un-equal header
Full Cobb catted TBE (with 2.5" taper)
20 psi peak to 15psi taper up top
10.9 AFR
Conservative 2007 STi piston timing :D

Before our newest AVCS changes this car made 300whp and 330wtq at our local PSI dyno with no fans or warm up (one shootout pass). Today we decided to put it on our road dyno setup and see what it put down. This proves how much lower the road dyno can read sometimes. I believe the new AVCS changes made the peak power more then before as per our testing on multiple platforms this week.

http://img.photobucket.com/albums/v412/brenwrx/KRAIG2007STistage2allmods.jpg

[civic si hb]

2007 STi
Stock motor replaced under warranty at 25,xxx miles (when purchased stock, cylinder 3 was already at 80psi) As a side note I make all 2007 STi's get a compression test before I tune them :)

Stock turbo
DW 850
Walbro 255 fuel pump
APS 65mm CAI
Perrin Inlet and After maf hose
Spearco TMIC
Forge UNOS mbc
GT-Spec Un-equal header
Full Cobb catted TBE (with 2.5" taper)
20 psi peak to 15psi taper up top
10.9 AFR
Conservative 2007 STi piston timing :D

Before our newest AVCS changes this car made 300whp and 330wtq at our local PSI dyno with no fans or warm up (one shootout pass). Today we decided to put it on our road dyno setup and see what it put down. This proves how much lower the road dyno can read sometimes. I believe the new AVCS changes made the peak power more then before as per our testing on multiple platforms this week.

http://img.photobucket.com/albums/v412/brenwrx/KRAIG2007STistage2allmods.jpg


What's the deal with the 07's compared to the 04-06's?? I know they have the VF43 and longer gears for the transmission and such but what causes them to have low compression and have engine issue's more often???

[BG @ BrenTuning]

Majority of them came with WRX pistons and WRX injectors and a horrendous stock tune. The cars are very prone to crack ringlanding's stock, or tuned. Most tuners refuse to dyno them, work on them without a compression test.

[civic si hb]

Majority of them came with WRX pistons and WRX injectors and a horrendous stock tune. The cars are very prone to crack ringlanding's stock, or tuned. Most tuners refuse to dyno them, work on them without a compression test.


Was this Subaru's way of cutting back or a mistake at the factory??

[kraigt]

Thanks again bren you do an awsome job! :)

and to anyone out there with motors issues on your 07 Sti there is more then enough info out there if the dealer trys not to cover your car.

[BG @ BrenTuning]

Was this Subaru's way of cutting back or a mistake at the factory??

No one is sure for certain.

Which is a shame as the 07 is my favorite model, best trans/best turbo, exterior trim and aux input ftw :cool:

[civic si hb]

No one is sure for certain.

Which is a shame as the 07 is my favorite model, best trans/best turbo, exterior trim and aux input ftw :cool:


Yeah I always wanted to get my hands on a 07 sti limited myself

[BG @ BrenTuning]

2007 STi
Stock motor replaced under warranty at 25,xxx miles (when purchased stock, cylinder 3 was already at 80psi) As a side note I make all 2007 STi's get a compression test before I tune them :)

Stock turbo
DW 850
Walbro 255 fuel pump
APS 65mm CAI
Perrin Inlet and After maf hose
Spearco TMIC
Forge UNOS mbc
GT-Spec Un-equal header
Full Cobb catted TBE (with 2.5" taper)
20 psi peak to 15psi taper up top
10.9 AFR
Conservative 2007 STi piston timing :D

Before our newest AVCS changes this car made 300whp and 330wtq at our local PSI dyno with no fans or warm up (one shootout pass). Today we decided to put it on our road dyno setup and see what it put down. This proves how much lower the road dyno can read sometimes. I believe the new AVCS changes made the peak power more then before as per our testing on multiple platforms this week.

http://img.photobucket.com/albums/v412/brenwrx/KRAIG2007STistage2allmods.jpg

Just a follow up.....

http://img.photobucket.com/albums/v412/brenwrx/KRAIG.jpg

SAE corrected, hotlapped 3 times with same numbers, 0 timing pull, AND safe to boot. Dyno operator scaled both sides to show equal curves, which effects the HP/TQ crossover. This car was tuned on the street in May.

To compare: here are it's most recent dyno results with NO tuning done on the dyno, The car made 314whp/380tq at 20psi setting, and 317whp/400tq at 22 psi.

This customer is seeking out a new 3 bolt gasket for it's header as it's leaking at the uppipe, this can be seen in the "flat" area right after peak boost between 3500-4500. He's going to fix it and go back soon. Perhaps it may make more/same? We'll see! :devil:

[shtbxr22]

nice! so numbers from the airboy are pretty close to a real dyno?

[BG @ BrenTuning]

nice! so numbers from the airboy are pretty close to a real dyno?


In this case, yes. Surprising to me. 10 different SAME DAY SAME CAR dynos/airboy/eq sheet will read 10 different ways. So one dyno result should not be compared to another to display who has more power.

What happened that day, those conditions, at that time, can be real specific. The scientific method would laugh at most dyno comparisons. What is important is the delta of the before and after gains of the tune to show, not the final peak number. This doesn't take into account proper dyno-ing techniques, airflow, manipulation of correction factors, cold motor vs. warm motor, iat and coolant corrections, etc etc.

For example: I had a 2002 M3 on the dyno the other day. It made 292 peak and 300 after. 8hp gain.

Negates the fact that it picked up ~13whp after the peak power to redline, and almost 20 ft lbs of torque down low, far below the peak torque and peak horsepower.

But on the contrary - if that 2002 m3 lost 20tq and 20hp throughout the curve before "peak" numbers but had 303 instead of 300, which would you rather have? Which car would accelerate faster? :cool:

[shtbxr22]

too many factors i think.

[etaks99rs]

In this case, yes. Surprising to me. 10 different SAME DAY SAME CAR dynos/airboy/eq sheet will read 10 different ways. So one dyno result should not be compared to another to display who has more power.

What happened that day, those conditions, at that time, can be real specific. The scientific method would laugh at most dyno comparisons. What is important is the delta of the before and after gains of the tune to show, not the final peak number. This doesn't take into account proper dyno-ing techniques, airflow, manipulation of correction factors, cold motor vs. warm motor, iat and coolant corrections, etc etc.

For example: I had a 2002 M3 on the dyno the other day. It made 292 peak and 300 after. 8hp gain.

Negates the fact that it picked up ~13whp after the peak power to redline, and almost 20 ft lbs of torque down low, far below the peak torque and peak horsepower.

But on the contrary - if that 2002 m3 lost 20tq and 20hp throughout the curve before "peak" numbers but had 303 instead of 300, which would you rather have? Which car would accelerate faster? :cool:


Its all about the curve, not the peak #s. I couldn't agree more!

[BG @ BrenTuning]

We've had this car tuned for 2-3 years and it's been on the rollers 3 times almost once a year. It made 303 on our basemap. 317whp, 319whp, and now 320whp custom tuned. Stock motored 2007 STi - tracked religiously. We lightly upgraded the tune due to a leak in the header: Made 320whp and 405wtq @ 19psi (less boost then above graph). This setup is great and one of the few cars to consistently crack 400wtq safely on our dyno stock turbo on pump gas.

[Subyspeed]

Thats so close to my set up i cant wait for my re tune!!!!!

[BG @ BrenTuning]

Recent graph 2 years later!

321whp / 405wtq 21psi.

http://a6.sphotos.ak.fbcdn.net/hphotos-ak-ash4/226226_10150175262231386_303417876385_7358715_6743 078_n.jpg

[kraigt]

Very happy with the tune car runs great