Determining BSFC map from logged OBD2 data

[palemelanesian]

I'm thinking your best bet would be to do several runs, at 10% throttle, 15%, 20%, etc. Run from as low a speed as you can up to max rpm, choosing a gear that allows you to max out at a reasonable speed, so aero drag isn't a big issue.

[fumesucker]

Originally Posted by PaleMelanesian

I'm thinking your best bet would be to do several runs, at 10% throttle, 15%, 20%, etc. Run from as low a speed as you can up to max rpm, choosing a gear that allows you to max out at a reasonable speed, so aero drag isn't a big issue.

You could get a lot of nice data to massage if you did that..

Update rate will be critical in getting good data.