AccessPort v3 0-to-60 and 1/4 mile times

...okay either I'm doing something wrong, or this feature isn't fully developed yet. I figured it would use a mix of known metrics from the OBD II system and incorporate features like one of the iPhone apps (with multi-axis gyro use for motion detection and such) and interpolate the rest.

I did a few 0-60 runs and only managed to log wildly different 60' times (1.7 to 2.5"). No actual timed run data was recorded.

The 1/4 mile feature didn't do much more.

Anyone know if this is something under development?

Also, this isn't a very rewarding way to drive the car! I have 100s of passes in my old FWD drag car (Carlsbad, Pomona, and Palmdale mostly) and it brought back memories of bad drag launches! This is definitely not where the fun is. Anyhow, I can't wait to get those stickier DZ2s on!

The 1/4 mile and 0-60 tests use the vehicle's wheel speed sensors. Therefore large amounts of wheel spin can cause odd readings or failed results. We are on a little holiday break, but I'll forward this thread to our Ford team and see if they have any input.

Ian

Hi Ian, thank you for the speedy response. This really isn't a big deal; I'm just dinking around. If this works, it would be fun to use this on occasion. The map itself is great, another fine Cobb product!

COBB said:

The 1/4 mile and 0-60 tests use the vehicle's wheel speed sensors. Therefore large amounts of wheel spin can cause odd readings or failed results. We are on a little holiday break, but I'll forward this thread to our Ford team and see if they have any input.

Ian

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I would think they would take this wheel speed sensor signal from the rear wheels so as not to see wheel spin during these tests.

Dave

D1JL said:

I would think they would take this wheel speed sensor signal from the rear wheels so as not to see wheel spin during these tests.

Dave

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Brilliant idea but does the rear even have speed sensors?

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stuntdoogie said:

Brilliant idea but does the rear even have speed sensors?

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Click to expand...

I wondered the same thing, then recalled that many systems do -- when the primary drive wheels rotate faster than than the non-driven wheels, you have an interesting condition for the traction computer (intervene or not). That coupled with the y-axis rotation sensor is the stuff of a stability computer.

Maybe there's a cheaper, no-sensor way, but I'd think there's a good chance we have them out back. Given our car's reliance on electro-wizardry instead of mechanical bits...

Also all modern ABS systems are four channel setups. I hope this is the easy tweak we need.

stuntdoogie said:

Brilliant idea but does the rear even have speed sensors?

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Click to expand...

Yes,
There ARE rear wheel speed sensors.
They are located on the back side of the rear hub spindle and read a cog on the back of the hub.

Dave

Cool.

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The speed sensors are needed on all four wheels for the ABS & stability control.

reddog99 said:

The speed sensors are needed on all four wheels for the ABS & stability control.

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It sounds like a few members have weighed-in authoritatively. It's great that we have sensors on all four wheels -- it's certainly the best way, but not required. Until recently, many manufacturers cheaped out and used either a 2 or 3 channel setup (just the drive wheels, or only examined a pair in addition). While ABS and stability control have overlapping features, they don't have the same requirements.

This is something we've been looking into and we just had a chance to go back through the code and make some changes. With your feedback we dug through the ECU code to find individual wheel speed sensors, and the averages for the front and rear wheels. We have changed the 0-60 and 1/4mi tasks to use the average rear wheel speed instead of the overall vehicle average speed. This should cut down on the early exit behavior and failed readings due to wheelspin in 1st and 2nd gears during the tests. Also, in the next major update you will now have access to monitor and log these readings for those of you that do track days or want to analyze your sessions!

Cheers,
-Braden @ COBB

Damn Cobb you guys rock!

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COBB said:

This is something we've been looking into and we just had a chance to go back through the code and make some changes. With your feedback we dug through the ECU code to find individual wheel speed sensors, and the averages for the front and rear wheels. We have changed the 0-60 and 1/4mi tasks to use the average rear wheel speed instead of the overall vehicle average speed. This should cut down on the early exit behavior and failed readings due to wheelspin in 1st and 2nd gears during the tests. Also, in the next major update you will now have access to monitor and log these readings for those of you that do track days or want to analyze your sessions!

Cheers,
-Braden @ COBB

Click to expand...

This is very good news, thank you! This is why we buy your products.

Oh right, when is this new release available?

Anytime! Our software releases occur on the last Tuesday of each month, so it looks like the 28th!

Cheers,
-Braden @ COBB

COBB said:

Anytime! Our software releases occur on the last Tuesday of each month, so it looks like the 28th!

Cheers,
-Braden @ COBB

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Im holdimg you to that *gun point* lol j/k

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COBB said:

Anytime! Our software releases occur on the last Tuesday of each month, so it looks like the 28th!

Cheers,
-Braden @ COBB

Click to expand...

So what happened to the 31st of December?
Just kidding.

Dave

^^^^ LOL

COBB said:

Anytime! Our software releases occur on the last Tuesday of each month, so it looks like the 28th!

Cheers,
-Braden @ COBB

Click to expand...

Once again VAPORWARE.

Going to the track this week and was hoping for something.


Sent with my retro keyboard and mouse.

Dave

D1JL said:

Once again VAPORWARE.

Going to the track this weak and was hoping for something.


Sent with my retro keyboard and mouse.

Dave

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Sorry for the delay! The ice in Austin really threw us for a loop. The new updated firmware available now has improved rear wheel speed sensor input.

Ian