Determining BSFC map from logged OBD2 data

fumesucker Determining BSFC map from... 05-28-2008, 11:50 AM

samandw You'd need something to... 05-28-2008, 12:37 PM

fumesucker Acceleration is simply... 05-28-2008, 08:28 PM

palemelanesian I'm thinking your best bet... 05-29-2008, 06:24 AM

fumesucker You could get a lot of nice... 05-29-2008, 07:24 PM

fumesucker I had planned on collecting... 05-29-2008, 07:03 AM

palemelanesian Now that I think about it,... 05-29-2008, 07:44 AM

fumesucker You have to know what the... 05-29-2008, 07:52 AM

palemelanesian Do you need to know the... 05-29-2008, 10:08 AM

fumesucker A vacuum gauge will give you... 05-30-2008, 03:50 AM

theholycow I should hope not. Except in... 05-30-2008, 05:36 AM

fumesucker I was trying to be nice. :) 05-30-2008, 05:59 AM

theholycow I can't directly control... 05-29-2008, 10:38 AM

monroe74 Sorry I've been away for a... 06-04-2008, 10:04 AM

fumesucker Use OBD2 to log speed, tps... 05-29-2008, 07:18 PM

fumesucker I got my ELM327 in the mail... 06-10-2008, 09:23 PM

monroe74 That's an interesting... 06-11-2008, 11:02 AM

fumesucker I haven't had time to do any... 06-12-2008, 04:10 AM

theholycow One piece of data that may... 06-12-2008, 05:51 AM

monroe74 I'm really not sure. I think... 06-12-2008, 01:18 PM

theholycow Yup, my 2008 VW is almost... 06-12-2008, 04:10 PM

fumesucker I guess I'm guilty of... 06-12-2008, 06:19 PM

monroe74 The ranks of the financially... 06-12-2008, 06:50 PM

fumesucker I appreciate your kind... 06-12-2008, 08:24 PM

derangedhermit SG has a load (LOD)... 06-26-2008, 09:30 PM

05-29-2008, 10:38 AM	#13
theholycow Registered Member Join Date: Apr 2008 Posts: 6,624	I can't directly control throttle position in my DBW car. Anyway, the throttle-based chart is workable. If OBDII could report measured fuel rate it would be very easy. Less easily, it can be done using the fuel injector duty cycle (fuel rate) meter (thanks, monroe74!) combined with the TPS and RPM readings logs. It would be necessary to get video of the meter, along with something for reference -- tachometer maybe. Then you frame through the video and record the meter reading alongside the logged TPS and RPM readings. I've been considering doing something like that. __________________ This sig may return, some day.

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