FJO setup questions for sequential twins
I'm just about done installing my FJO HD AI system.
1) Which "injection mode" would be best for a dual-purpose car, setup for both street and for road-circuits ? a) MAP vs RPM; or b) MAP vs TPS I want to be able to modulate the power, and hence the flow of water based-upon BOTH RPM and TPS, but I only have the two options above. 2) Should I get the RPM signal from the tach signal or the coil-trigger signal ? a) if tach, is it +3 ? b) if coil trigger, how often does a 2-rotor "fire" per crankshaft revolution ? I'll be running distilled water only, with a single 600cc injector. She still runs the stock twins in stock sequential form. The engine is mildly street-ported, with 4x850cc injectors controlled by a PFC that is very conservatively tuned by Steve Kan at 14-psi (high) and 10-psi (low). Since the tune is very conservative, I'm thinking 20% water is good starting point. BTW: I'm NOT tuning-up, is there any harm in NOT installing the option boost control solenoid ? Lastly, I do have a DataLogit if I need to modify the fuel-map, and an Innovative (not FJO) wideband. Thanks, :-) neil |
I would vote MAP vs RPM, as I would think that most of the data points with MAP vs TPS would be redundant since you're not going to be building boost without using a certain amount of throttle.
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Tech support agreed that for circuit/road courses, MAP vs. RPM.
Use tach signal vs. ignitor/coil, as the tach signal is cleaner, and just adjust the settings to get the right RPM. Use 3000 RPM as a reference. No need to use the boost control solenoid when not tuning-up. FJO will can ONLY use FJO wideband when used to control boost, as the FJO wideband has a databus. You can still use your other widebands to monitor and help tune, but you can't use it as a safety input. :-) neil |
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