PhatBotti Tuning

Mod PATH

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Basic Setup Pump Gas - TGV, EGR, Grimmspeed EBCS

This is a nice simple setup.  These mods address the major downfalls of the car and will greatly reduce the cruise knock and make the boost control better for overall smoother power delivery.  The IBR full TGV will provide 10-15 hp over only the upper TGV.  

This setup will make 260-280 tq and 240-260 whp.

Basic Setup Ethanol - TGV, EGR, Grimmspeed EBCS, DW300c, Cobb Flex Fuel

Same setup as above with DW300c and Cobb Flex Fuel Kit.  The BRZ Fuel Pressure Regulator (Part #42024CA000) can also be added.  The BRZ FPR operates at 60psi vs the 52psi of the WRX FPR.   You will be required to mix ethanol and pump gas to reach the desired ethanol content of e60.  This is due to limitations of the stock high pressure fuel pump.    

This setup will make around 325 tq and 325 hp on e60.  

Advanced Setup Pump Gas - TGV, EGR, GEBCS, GS TMIC, GS TBE, GS Intake

The stock intercoolers on these cars is simply not good.  The intercooler and exhauast work in conjunction with each other.  If you free up the exhaust, but leave the stock intercooler, the charge temps will still be high and the car will still be knock prone.  If you change the intercooler, but leave the exhaust stock, the charge temps will be lower but the exhaust will be plugged up creating higher back pressure and hotter exhaust gas temps.  The exhaust and intercooler really need to be done at the same time to see maximum benefit. 

The Grimmspeed TMIC may be replaced with a Process West Verticooler or a PRL FMIC or ETS FMIC.  For the ETS FMIC get the 4 inch core and this gasket to put in place of the paper gasket on the turbo outlet flange  Mr. Gasket #738G    https://www.jegs.com/i/Mr-Gasket/720/738G/10002/-1 

This setup will make around 300-320 tq and 280-300 whp.

Advanced Setup Ethanol (e60) - add DW300c + Cobb Flex Fuel

Same setup as above with DW300c and Cobb Flex Fuel Kit.   The BRZ Fuel Pressure Regulator (Part #42024CA000) can also be added.  The BRZ FPR operates at 60psi vs the 52psi of the WRX FPR.  You will be required to mix ethanol and pump gas to reach the desired ethanol content of e60.  This is due to limitations of the stock high pressure fuel pump.  

This setup will make 350 tq and 365 whp on ethanol.

Advanced Setup Ethanol (e85) - add Nostrum High Pressure Fuel Pump

This will allow you to run straight e85 and not have to mix down to e60.  The car will make the same power, just avoid mixing.

Bypass Valves, External Wastegates, Turbo Inlets

These really aren't necessary on stock turbo setups.  Especially the external wastegates.