HHH Wideband Datalogging

[TonyM]

First off I take no responsibility for your ECU melting, car blowing up, etc.

Firs you need to wire your Wideband's 0-5v output into the unused EGRT connector on the firewall. There are plenty of thread on this, just search. Then, go into the HHH datalogger and setup a user definable sensor. Now, I am a hybrid ECU and this worked for me, no guarantees for the OBDI crowd.

Description: Air/Fuel Ratio
Formula: (($pid/51*0.1366)+0.663)*14.64
Sensor ID: 18
Lower limit: 10
Upper limit: 19
Precision: 2

Now, I had to tweak the formula slightly to get the HHH to line up with exactly what my AEM gauge was reading. This will be necessary for pretty much anyone as variances is grounding location, etc. may cause a variance between what your gauge reads vs. what the logger shows.

In the formula: (($pid/51*0.1366)+0.663)*14.64

$pid/51 = Converts the logger's 0-255 output into volts
(($pid/51*0.1366)+0.663) = Converts the voltage into a lambda value, normally you would add 0.683 instead of the 0.663 in my formula. This is where I did my tweaking, I took out .02 to compensate for my HHH logger reading about .3 AFR high.
(($pid/51*0.1366)+0.663)*14.64 = Converts the lambda value into an AFR reading. 14.64 is the multiplier to convert lambda into a gasoline AFR.

As far as the precision value goes, I tried using 0 but that gave me no resolution and only read in whole integers. I tried 2 and it goes out 2 decimal places and seems to track my AFR at +/- .05 which is pretty good. I just did this quick tonight after work and didn't have time to take the car out and see how it looks at WOT, etc. but I will verify over the next couple of days.

Have fun and happy datalogging.

[futurevr4man]

it would be great if you wouldnt mind updating this with results. im very curious

[TT Eric]

Thanks, I'll try this on my 1G.

Eric

[TonyM]

it would be great if you wouldnt mind updating this with results. im very curious

Results? It works, haha.

Guess I should've edited the 'post back with tests over the next couple days'. I did this about 3 years ago and just copied the post from another place I had posted it. It works as advertised, no problems.