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

6890 Views 21 Replies 6 Participants Last post by COBB, Jan 30, 2014

McRib 1s Back

Discussion Starter · Dec 22, 2013

Anyone play with the timed runs on the v3 yet? I'm going to log a few runs today to see what I get with my mild mods. If nothing else, it should be consistent. I have no experience with this yet, and I'm curious if others here have found it useful. So far, I just keep a single big gauge up for boost pressure while driving. The options are awesome, but I can only see using the other detail while parked and troubleshooting or dinking around!

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McRib 1s Back

Discussion Starter · #2 · Dec 22, 2013 (Edited)

...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!

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COBB

· #3 · Dec 22, 2013

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

McRib 1s Back

Discussion Starter · #4 · Dec 22, 2013

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!

Reactions: 1

D1JL

· #5 · Dec 22, 2013

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

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

stuntdoogie

· #6 · Dec 23, 2013

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

Brilliant idea but does the rear even have speed sensors?

Sent from my SPH-D710 using Tapatalk

McRib 1s Back

Discussion Starter · #7 · Dec 23, 2013

stuntdoogie said:
Brilliant idea but does the rear even have speed sensors?

Sent from my SPH-D710 using Tapatalk

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.

D1JL

· #8 · Dec 23, 2013

stuntdoogie said:
Brilliant idea but does the rear even have speed sensors?

Sent from my SPH-D710 using Tapatalk

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

stuntdoogie

· #9 · Dec 23, 2013

Cool.

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reddog99

· #10 · Dec 23, 2013

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

McRib 1s Back

Discussion Starter · #11 · Dec 23, 2013

reddog99 said:
The speed sensors are needed on all four wheels for the ABS & stability control.

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.

COBB

· #12 · Jan 8, 2014

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

Reactions: 4

stuntdoogie

· #13 · Jan 8, 2014

Damn Cobb you guys rock!

Sent from my SPH-D710 using Tapatalk

Reactions: 1

McRib 1s Back

Discussion Starter · #14 · Jan 8, 2014

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

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

Oh right, when is this new release available?

COBB

· #15 · Jan 8, 2014

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

Cheers,
-Braden @ COBB

stuntdoogie

· #16 · Jan 8, 2014

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

Cheers,
-Braden @ COBB

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

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D1JL

· #17 · Jan 8, 2014

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

Cheers,
-Braden @ COBB

So what happened to the 31st of December?

Just kidding.

Dave

pelotonracer2

· #18 · Jan 10, 2014

^^^^ LOL

D1JL

· #19 · Jan 29, 2014 (Edited)

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

Cheers,
-Braden @ COBB

Once again VAPORWARE.

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

Sent with my retro keyboard and mouse.

Dave

COBB

· #20 · Jan 29, 2014

D1JL said:
Once again VAPORWARE.

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

Sent with my retro keyboard and mouse.

Dave

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

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