Aem air fuel gauge install6/13/2023 the stock ECM only uses it during closed loop, which is off when you first start the car, and off at close to WOT - WOT. its less then 1 point AFR and centered around 14.7:1, making it completely useless. The stock narrowband ouput is such a narrow range, its ridiculous. How is changing the fuel pressure supposed to take localised variations into consideration? I'm sure you've seen the "AEM hump" power increase in the low-midrange of most Honda engines. If mods to the engine increased uniformly throughout the whole powerband, then yes, it would work, but we all know that's not the case. Changing the pressure will increase/decrease fuel flow through the injectors, but it's not precise enough to tune with. The software can be had for free for both OBD0 and OBD1 setups. If you're actually doing mods that require tuning beyond the adjustments a stock ECU can do, you have the money to get a proper setup, which includes a wideband and actual tuning software. Sounds a lot cheaper and easier than replacing a motor that blew up due to a poor tune. ![]() ![]() An Innovate LC-1 can be had for about $180, and takes about 30 minutes to install. If what you say is true, there would be no need for wideband oxygen sensors, just higher-resolution software to tune with. ![]() Your narrowband does little more than tell you "too lean" or "too rich", and the stock ECU compensates for that by changing the duty cycle of the injectors.
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