Honda Civic Si, Greddy Turbo w/GT3071R, 358whp/250tq, Hondata FlashPro

The Car: 2007 Honda Civic Si


  • Bone stock K20z3

Performance Modifications:

  • Greddy Turbo Kit
  • Upgraded GT3071R .86 a/r Turbine
  • 70mm Downpipe/Test Pipe
  • Full Race 3″ Exhaust
  • Tial 50mm “Q” Bov

Fuel System:

Engine Management:

The Tuning Rundown
This car was tuned using 93 Octane @ 12 psi of boost.

The Dyno Graph(s)

Dyno Video

Overall Impression:
This particular set-up is somewhat unique in that its a full Greddy Turbo Kit, but with a Garrett GT3071R T25 frame turbo installed in place of the Greddy turbo. The dynograph displays the difference in power and torque between the car using the Greddy turbo with the stock exhaust at 10 psi (red lines) and Garrett GT3071R and Full Race 3″ exhaust installed (yellow) at 11-12 psi. A particularly interesting observation is that there is no loss in spool with the much larger GT3071R turbo installed. Tuning was stopped at this boost level due to fuel system at 95% injector duty cycle.

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