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Old 08-25-2018, 12:17 PM   #1
Scooby Newbie
Member#: 221439
Join Date: Aug 2009
Chapter/Region: E. Canada
Location: Quebec, Canada
2004 STI

Default My G25-660 2.35 build

Here is the info on the build and the results
  • Cobb access port v3
  • Speed density
  • Cobb flex fuel sensor, Canadian 94 and E85
  • Garret G25-660 with 0.72 hotside rotated custom setup
  • Process West TMIC
  • TGV delete
  • Custom parallel fuel rail
  • Walbro 450 fuel pump, hardwired
  • Aeromotive A1000 FPR
  • Cobb 1300X top feed injectors
  • Rebuild engine 2.35 (ej257 with 2l crank)
  • Manley 8.5 compression ratio 100mm, heavy duty piston pin (**8.1 effective compression ratio on 2.35)
  • Manley MPS h-tuff rods +2mm
  • 11mm head studs
  • MPS 10mm oil pump (ported +1 shim)
  • Static and dynamic balancing
  • Heads
  • Bowl blend porting
  • Power division S1 cams
  • Tomei high rev springs
  • Tomei headers
  • Custom catless downpipe and Cobb axle back
  • Grimmspeed electronic boost controller
  • External wastergate, tial 38mm
  • EFI Logics tune

1 pull on 94:

Final results:

Very impressed with results so far. We had to limit boost on E85 since we maxed the injectors (93%). TMIC was also limiting we had quite high temperature. Probably close to a point where a closed deck would be a good idea. Last point I wanted to rev up to 8500 but the ECU started acting weirdly pass 8000 and we had to stop. It's a 04 STI ECU, could be limited as they were upgraded from 05 and up.

Tx to EFI Logics, Calvin, Cory, Pete, Ben all professionnals, they did a crazy jobs.

Tx a lot to Freedom Shop for the custom turbo setup

I've not driven the car yet on track, will have to wait a few weeks before I autocross it. Car is built for hardcore autocrossing. It was a bit of a gamble to test that turbo and try a destroke 2.35 at the same time. Looks like there is more to this turbo and that the 550 would have probably given similar result with even better spool. I'll report back with more info once I tested it on the track.

Expension plan for the future would be to go up to 8500-9000rpm to help with short gearing of the subaru in autocross. I could also try a slighly higher compression ratio (9.0 or 9.5) to help with spool and response. Anybody that reached 9k rpm and would like to share info on how to achieve this you can contact me in private
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Last edited by smoky; 09-06-2018 at 11:13 AM.
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