Hondata

I've been tuning my motor with some upgrades, it's a B18B1 NA build. New intake, and injectors. It's a race car, bought from another guy. The weird thing i'm trying to track down, is that on all my logs, even after i bought the car, and before i started trying to tune for the new parts, there is this jump in injector duty cycle/pulsewidth at 5800rpm. Watching how the log passes through the fuel table, it doesn't seem to explain the jump. I can't find any features that activate at 5800rpm, let alone ones that might effect the fuel injectors. Any ideas?

An example of the jump can be seen at 3:17 in the attached log.

Oh just fyi, my O2 sensor seems to be failing so i stopped until the one i have on order arrives... It was reading ok before, but a little rich, around 11.5-12.7, but now it's getting stuck and then erroring out...

Thanks!

Karsten Wilson

If you have the wideband hooked up so it is datalogged, then it is running VERY rich, or the sensor is faulty as it is reading in the 7's.

Yes it's definitely broken. I pulled on off my other racecar this morning, and it was 12.5 - 13.5 range for everything, except > 5800 where it adds the 20% fuel. I've got a new one on order!

I went ahead and tweaked the fuel tables to compensate, and it is much better, but I still don't understand why 5800 has such a steep cutoff. I mean even my fuel tables have data points at 5000 & 6000, so seems like it should be a more gradual change...

Thanks,

Karsten