Hey All,

Finally installed my LC-1, in the frontpipe, just before the cat!

Now given that there is about 1.3 meters of piping between the cylinders and the WB02 should I take into account a slight delay in the readings?

ie
time,load,rpm,wb02
0.3, 200, 3000, 12.0
0.6, 210, 3100, 11.8
0.9, 190, 3200, 11.5
1.2, 180, 3300, 11.2

so the 11.5 AFR belongs to the 200load/3000rpm?
so if I want to increase the AFR by 0.2 I would add 0.2 to the 200/3000 cell? rather than the 190/3200 cell!

Cheers
David

 

there will be a slight delay in the reading, but at 3 samples per second you are probably as close as you can get. I'd say the AFR logged at 3100 would really be the AFR at 3000, not the 200 RPM jump in your example.

However, all of the cells in the fuel map interpolate, so changing the value at 3000/200 will change the AFR at 2600 - 3400 RPM and 182 - 218 load anyway. This is assuming that you are using the stock ECU.

I log with EvoScan and get about 12 samples/sec. This is faster than EvoScan reads the signal from the LC-1. That means that the only delay is caused by the distance from the valves to the sensor. If you know how to calculate the exhaust flow rate, that would tell you your answer.

 

Yep, thinking about this the exhaust is going to flow MORE @ higher RPM, so the WB lag will be less..

anyone have any calculations we can do to get rough ideas on flow/timing?