Hi guys,

Well, we got our STI turbo-back fitted to the test car. In case you forgot we dyno'd this stock STI at 210-215 wheel hp and 220ft-lbs of torque with audible detonation between 3500 and 4500RPM. Peak boost was 14psi, falling off to 13psi by redline.

Next, we added an XEDE, this brought power and torque up to 235 wheel hp and 240ft-lbs of torque with zero detonation and perfect consistency. Peak boost was 15psi, falling off to 13psi by redline.

Next, we installed our 3" STI turbo-back and retuned the XEDE. After a bunch of tuning runs, output steadily climbed to a ridiculous 260 wheel hp and 272ft-lbs of torque. Yes, 272ft-lbs of torque. This is more torque than ANY WRX we have ever tested short of our two Stage 3 test cars running race gas. Our 12 second Stage 2 WRX, at best, make 220-230ft-lbs of torque. Even those that run 110+mph trap speeds. For another comparison's sake, a stock WRX makes a peak of just 165ft-lbs of torque. Peak boost of the Stage 1 STI was 16psi, falling off to 13psi by redline.

The Neat Part:
In fact, comparing the Torque and HP curves of a Stock WRX to a Stock STI to the Stage 1 STI, it becomes clear that the difference between the stock STI to the Stage 1 STI is virtually the same, across the board, as the difference between the Stock WRX and the Stock STI. Yep, it's that significant. And no knock either.

Once we get our scanner up and running, we'll post up charts. They speak louder than any words I can come up with. Geez...

Here's some rough numbers (from looking at the graphs) just in case anyone wants to plot them on an excel spreadsheet to see what I'm talking about. I hope it comes through okay.

Wheel Torque

RPM- Stock WRX - Stock STI - Stage 1 STI
3200- 135 - 165 - 250
4000- 165 - 215 - 270
4800- 160 - 205 - 260
5600- 155 - 200 - 245
6400- 120 - 165 - 200


Wheel HP

RPM- Stock WRX - Stock STI - Stage 1 STI
3200- 80 - 100 - 150
4000- 125 - 165 - 205
4800- 145 - 195 - 240
5600- 165 - 210 - 260
6400- 150 - 205 - 245

Cheers,
Shiv

PS. All testing done on 91 octane fuels. Can't wait to see what happens on 93/94 and then on 100+ race gas
________
VAPIR ONE VAPORIZER

 

NICE!!!

 

Awesome work Shiv. I might be dropping by sometime (mostly to annoy Daniel)

-Gagan

 

Real Question Is: How does this Stage 1 STi compare to a similarily modded stage 1 Evo??

-Gagan

 

Granted the EVO is Stage0, the fact that XEDE tuning plus catback yields about 20hp on the EVO says to me that the STi (which has just begun to be tuned, too) is showing a hell of a lot more potential with similar mods (the non-sig turboback used has a cat, right?) 260hp with a turboback and ecu tuning? That's a 40hp increase on the STi vs. 20hp on the EVO...schweet.

 

hi shiv, i recently bought a new 04 WRX and really want you to do the tuning since i believe vishnu is the best quality for tuning WRX's. is that possible at all that you upgrade my car for me? i live in los angeles.

-mike

 

Ummm, when can I get this? And... how much will it cost me?

 

Word!