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December 1, 2006
Dyno Project & Development
Since the racing season is over in New England, its time to start planning for next year. The bottom end of this engine is tough, and its no where close to maxing out, at 15 psi boost. The plan is to rent a dyno for the day, and do as many tests as possible.
First - Baseline at 6, 9, 12, and 15 psi.
Then review the data logs, and tweak the fuel maps to set the air:fuel ratios in the right place.
A few more rounds of baselines at 9 and 15 psi, optimizing the fuel table. I'd like to get an idea of how much injector duration change (milliseconds) changes the air fuel ratio, to help speed up tuning and peaks/valleys in the AFR curves. Also compare the dual downpipe AFR's vs the dyno AFR's. Possibly have the EGT probes mounted right before the turbos as well.
Test3 - Remove cone filters
Test4 - Remove Corrugated Hose and run just an open turbo inlet
Test5 - Remove single boomtube, and run just an open 3.5" y-pipe
Test6 - Remove 2.75" downpipes & y-pipe, and run an open 3" elbow pointing up from each turbo (remove hood?)
Would like to have ready:
Wire in Accel 300+ ignition system
Have 2 EGT's wired to gauges/data loggers
Have 2 wideband O2's wired to gauges/data loggers
Video in-car to record gauges (Fuel Pressure, Boost, RPM, AFR, EGT)
Data logger for MAP/2-AFR/2-EGT/TPS/RPM/InjPulsewidth
I expect the higher boost pressures to require more fuel than my Walbro pump can handle, so at some point, I'll have to draw the line.
Posted by Z28tt at 11:13 AM