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Location:
Melbourne
Registered:
January 2003
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Re: Injector Duty Cycles
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Thu, 07 July 2005 06:55
 
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I second want Sideshow said , you cannot go of any of the reading you are getting from a cheap air fuel ratio , or any readings that you are getting from a voltage from the cars oxygen sensor like all that Apexi gear . They all read 10+ ratio as soon as the engine is underload . Also placement of the sensor plays into this alot .Most good dyno tuners have Motec ,Autronic sensor and use them externally in the exhaust unless you have added another port for tuning .
As for the sr being at 100% duty , i was at 83% at 180rwkw . He must be running a t25g at 1.2 bar to get there if the turbo is still stock , that might have something to do with the fuel mixture due to the inefficiencies of the stock turbo at that level . Also the fuel pressure rate rise of the stock regulator will never keep up , next the stock mapping will run at about 10.0 above 4000rpm to protect the engine from detonation . Funny that with a more efficient turbo on the stock ecu the ratio is way leaner throughout the rev range , and the fuel pressure didn't need to be run at such great pressure as before so the injectors where for sure not operating at the same rate as well as more power at 0.8bar . From memory the stock redtop units are only 380 units ? s15 are 440cc ?
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