OBDII scanner / engine performance

cossie1600 · 09-27-2011, 11:45 PM

A few years ago I was told cars can lose performance if the OBDII port is used for data retrieval. Anyone know if that is a myth or true? If it is, how about the 370?

edub370 · 09-27-2011, 11:49 PM

ehhh.... idk how that would even be possible. thats like saying reading texts on your cellphone will hurt its performance...

cossie1600 · 09-27-2011, 11:51 PM

I think it was from Mazda or something, they do some weird stuff. I doubt it too, but curious if anyone can confirm

Jordo! · 09-27-2011, 11:55 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 · 09-28-2011, 12:09 AM

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).

cossie1600 · 09-28-2011, 12:52 AM

It was a long time ago, you might be right that we probably dont have that problem

09-27-2011, 11:45 PM	#1 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 30	OBDII scanner / engine performance A few years ago I was told cars can lose performance if the OBDII port is used for data retrieval. Anyone know if that is a myth or true? If it is, how about the 370?

09-27-2011, 11:49 PM	#2 (permalink)
edub370 A True Z Fanatic Join Date: May 2011 Location: KCMO Posts: 3,458 Drives: 09 370z S/T 6MT Rep Power: 20	ehhh.... idk how that would even be possible. thats like saying reading texts on your cellphone will hurt its performance... __________________ 09 370Z ST 6MT//Injen CAI//Greddy CBE//TP//TSW's//Swifts//Stillen lip//Whiteline sways 326whp/268tq

09-27-2011, 11:55 PM	#4 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 418	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.

09-28-2011, 12:09 AM	#5 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 653	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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09-27-2011, 11:51 PM	#3 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 30	I think it was from Mazda or something, they do some weird stuff. I doubt it too, but curious if anyone can confirm

09-28-2011, 12:52 AM	#6 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 30	It was a long time ago, you might be right that we probably dont have that problem