OBDII scanner / engine performance

Jordo! · 09-27-2011, 10:55 PM

I'm thinking complete myth.

The kernel of truth may be this: After 200+ reflashes, ECU's can start to act a bit wonky, or so I've been told.

ChrisSlicks · 09-27-2011, 11:09 PM

It probably dates back to the old ECU's when OBDII first took over (1995). The ECU's of the day weren't all that fast so delivering serial information on the OBDII port could potentially make the ECU process engine data a few cycles slower. Probably not by much, and probably not enough to make a significant difference. In modern ECU's not likely at all, they have extremely fast processors compared to 15 years ago, the data on the OBDII port is nothing to them (even though the data rate is now higher).

09-27-2011, 10:55 PM	#1 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 420	I'm thinking complete myth. The kernel of truth may be this: After 200+ reflashes, ECU's can start to act a bit wonky, or so I've been told. __________________ Enjoy it. Destroy it.

09-27-2011, 11:09 PM	#2 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 655	It probably dates back to the old ECU's when OBDII first took over (1995). The ECU's of the day weren't all that fast so delivering serial information on the OBDII port could potentially make the ECU process engine data a few cycles slower. Probably not by much, and probably not enough to make a significant difference. In modern ECU's not likely at all, they have extremely fast processors compared to 15 years ago, the data on the OBDII port is nothing to them (even though the data rate is now higher). __________________ Hotchkis ARB \| Stillen CAI \| Art Pipes \| Berk CBE \| Stillen AP Racing Brakes \| AE Performance Oil Cooler \| BC Racing ER Coilovers \| Doran Control Arms

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