Quote:
Originally Posted by chetanhanda  Hi turbosam, what u think abt this ..
.. in a stock engine , with a stock narrowband .. if there is extra dense cold air comming in the ECu will not utilise it all.. the ECu will be still be using the factory fuel map.
Unless we have a AFC, or piggyback/standalone ECU we wont be able to increase the IPW at diff rpm points..so the STFT,LTFT will remain the same ... 
so a free flowing exhaust would simulate a condition simlar to valves with bigger overlap, more charge gets pulled in, increasing the combustion flame speed , so requiring the need for appropriate ignition advance. stock ECU will again use default timing maps..so unless we tweak the timing slightly we wont get much improvement .. .. will basically give more power for a given AFR as compared to lower octane fuel...
so basically with a stock speed-density ECU with stock fuel and timing maps we cannot expect much gains unless we can control the IPW and advance/retard .. so a free flow KnN filter(doubtfull if its better than stock) and free flow exhaust should require some basic tweaking to maps to make a diff..otherwise its just increase in intake and exhaust noise  |
WE CAN DEFINATELY HOPE THAT we have a wide band <preferably 4 wire> lambda sensor+good quality knock sensor+good and steady octane rating fuel + 30%+/- tolerances in all the igntion and fueling plots,+ all the actuators can handle it<including the injectors and coils> then hope ur fuel pump and filters can handle it------ and everything work better than expected.
amen!!
