Dyno - 95 GSR Turbo

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Hondata, Inc.
2840 Columbia St
Torrance, CA 90503
 

  • The specifications of this car are 9:1 compression with JE pistons. Oil is Mobil 1. The turbo kit is a Drag turbo with a T3/T4 hybrid. Fuelling is via RC 440cc injectors and Vortech adjustable 1:1 fuel pressure regulator set to 60lb static. The fuel pump was the stock Civic CX pump supplemented by an inline MSD pump.
  • The air compressor looks too large for this capacity of car as the turbo only begins spooling up at 3000 RPM, with full boost reached by about 4100 RPM. As a result we think that the turbo is operating outside its efficiency range.The first power run netted us about 225 Hp at 6Lb boost. Using a wide band 02 sensor the mixture.
  • Ignition timing was interesting. Many people run stock ignition timing for turbos. At 8000 RPM this is something like 24 degrees btdc with the stock ecu. With the Hondata tuned ecu, we found no power gains advancing the ignition beyond 18 degrees btdc at 10Lb boost. This will mean that cylinder pressures will be lower for the same amount of power output. Injector duty cycle was reaching 75%, meaning that either bigger injectors or more fuel pressure will be needed for much more power.
  • If we ran the GSR manifold with on the locked on the short runners, we lost 10-15 hp below 5000 RPM. If we locked the car on the long intake runners, we lost about 15 Peak hp. Watch this space soon for the 3 Bar map sensor upgrade, when we take the car to higher levels of boost.
  • On road performance - the car pulls at least 150 (7500 RPM) in fifth with more to come on 4 lb of boost with 30mpg at 85-90 mph.

 

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