OBD-II can you use it to... - Page 2

DavidL · 08-22-2004, 02:06 AM

Roger, in most vehicles the odometer is kept in several modules. You can reset the odo held in the ecu with a factory scan tool in many vehicles, but that won't reset the odo that you see on the dash.

The "fishhook" manuever is the one that NHTSA uses to rate rollover. Just going 50 in a corner is not simulating the worse case. The fishhook gets the momentum of the vehicle transitioning from one direction to go way over in the other.

more mods · 08-22-2004, 02:37 AM

Quote: Originally Posted by djtrickee

Ahhh to dream a little dream.

I dont think he gets it!

dodgetimes2 · 08-22-2004, 10:46 AM

Governors are commonly used to limit the top speed of the vehicle to that of the speed rating of the tires that came with it. For example my truck came with S rated tires, which have a top speed rating of 112, this also happens to be the same speed that my governor kicks in. Not sure about other cars governors but on my truck the computer drops spark to some of the cylinders to prevent further acceleration.

Spaghetti · 08-22-2004, 11:01 AM

Dodge is right - there's a reason why tall off-roaders are limited - high centre of mass and the tyre limit. Off-roaders are susceptible to flipping as they are - taking it past 120 really isn't a good idea

gospeed.racer · 08-22-2004, 11:16 AM

If you want to elminate the governor...you can get a custom chip burned for the pcm and it will take care of that. Problem is your out about $400 for the chip, but later if you make mods to the motor you can have the chip reburned to adjust many parameters. We do a ton of chips on Mustangs, not sure if it would be worth it on a SUV or not, but thats how you do it

Heezzi · 08-22-2004, 09:11 PM

Quote: Originally Posted by DavidL

Roger, in most vehicles the odometer is kept in several modules. You can reset the odo held in the ecu with a factory scan tool in many vehicles, but that won't reset the odo that you see on the dash.

The "fishhook" manuever is the one that NHTSA uses to rate rollover. Just going 50 in a corner is not simulating the worse case. The fishhook gets the momentum of the vehicle transitioning from one direction to go way over in the other.

Not only that, the DMV also year to year takes record of the odo when its is registered. So they will find out if it was.

muldrick · 08-25-2004, 02:15 PM

I could be wrong...but I believe that most newer cars have rev limiters, not speed governers. Lexus (I work on 'em) uses rev a limiter.

Chronic13 · 08-31-2004, 10:05 AM

Quote: Originally Posted by Heezzi

Not only that, the DMV also year to year takes record of the odo when its is registered. So they will find out if it was.

How do they do this? I dont have to go back to the DMV for 8 years...

EBFoxbat · 08-31-2004, 10:20 AM

Quote: Originally Posted by muldrick

I could be wrong...but I believe that most newer cars have rev limiters, not speed governers. Lexus (I work on 'em) uses rev a limiter.

It's usually only a RPM limiter in the highest gear. The gov is an onchip-chunk of code. You can replace the chip or reprogram it. A bit pricey.

Some OBD-IIs can send other codes, it depends on the car. I think the minimum of the OBD-II standard is to reset the engine light. Most new cars can be reset without any control. I know my mother's 04 Toyota Highlander can be reset by using the ignition and trip-odometer reset button in the right order.

Ill1 · 08-31-2004, 10:31 AM

My STi has a rev limiter at ~7K. It cuts the fuel as to not blow the engine.

DavidL · 08-31-2004, 05:43 PM

EBFoxbat,
I would say "most" vehicles you cannot reset the MIL light with a combination of buttons and that you do need a scan tool to do the reset. There isn't much good reason to reset the light if you haven't pulled the vehicle data first, which also requires a scan tool (for great majority of issues and for the purposes of what the MIL light is mandated to begin with).

What do you mean that "some OBDIIs can send other codes"? OBD2 is a US federal regulation that Requires vehicles to do certain event reporting and functions to aid in diagnostics. It isn't "some vehicles".

And the "minimum" is not a reset of the light. The regulation is very specific on what it entails and there is no such minimum requirement.

BTW, where are you getting your information for "usually only a RPM limiter in the highest gear" from?

jpelzer · 08-31-2004, 05:54 PM

Quote: Originally Posted by DavidL

EBFoxbat,
What do you mean that "some OBDIIs can send other codes"? OBD2 is a US federal regulation that Requires vehicles to do certain event reporting and functions to aid in diagnostics. It isn't "some vehicles".

I think he means that some cars send extra data over the OBDII interface that is manufacturer-specific. You're correct that the mandated data is there for every car, in the expected format. But each manufacturer can make other data available over the same bus using their own format. There are also manufacturer-specific error codes.

frodobaggins · 09-01-2004, 03:02 AM

I don't know about my 98 ranger, but I had a 96 once.
I couldn't get past 95 in 5th gear. I dropped to fourth and hit 115 !
(No governor/limiter in 4th apparently

)

(It was still accelerating too, but I got scared as it started to "float")

DavidL · 09-01-2004, 06:31 AM

frodo, sounds like your speed limiter was horsepower / torque curve vs. aerodynamics and not ECU induced