Rough Country Speed Calibrator: Cruise Control Skipping Certain Speeds - Help!

I just bought the rough country inline speed calibrator item no: 90043 for my 2019 Toyota Tacoma OR DCSB but its not working quite right.

When the cruise control is set, if I use the CC lever to increase or decrease the set speed, it will skip 44, 59 and 74 MPH. Has anyone else experienced this?

 

I have seen this before. I needed to change the correction factor a tiny bit to correct the issue. It seems like the CC is rounding up/down so you sometimes get a duplicate when increasing up/down. A good reason to leave the USB cable attached so you can make revisions without taking the cluster out each time.

 

Thanks for the advice, I'll try that. The plastic trims pieces are already removed and module is tucked behind the top part of the gauges, which makes it easy to pull out and remove when I need to reprogram. I don't need to take off the intrusment cluster every time.

 

Besure to update the software too. Extending the cable as timclark82 says is very handy.

 

Thanks for the suggestion. The SW is the latest. I contacted RC and they want me to capture video of what is happening so it can be shared with their R&D team.

 

Here's a pic, you'll notice the red module on the top right corner. I just pop the module out, disconnect it and reprogram.

 

There is definitely something wrong with the module, adjustment to the ratio just shifts the MPHs that CC skips, but speeds are still skipped.

 

Did RC ever get back to you? Would be interesting to see if they can fix it with a software update.

 

I returned the module and got a new one. The new module behaved the same.

Response from RC:
"If the new one did the same thing then it’s not the calibrator. Something in your computer system is having an issue. The only option would be to return them."

I wonder if the hypertech does the same thing? If it does, what the he'll is wrong with my truck?

 

The Rough Country module is Hypertech. I opened my Rough Country to find the board inside labeled "Hypertech".

You could try another computer to see if their theory is correct.

 

I just realized my computer is running Windows 11 Enterprise, maybe that's the culprit. I'll have to find another computer and try it out.

 

RC representativs response to using another computer: You can try that. I heard back from our supplier on this one and they said, “I am familiar with this it’s in the way the computer rounds up that it skips different mph. There’s no fix for that its caused by the rounding of the computer calculations.”

 

i guess i've never tried to adjust speed using cruise control I'll have to go see.

 

That’s a cop-out for not having an answer if I ever heard one. This is the only time I’ve ever seen this issue shared on here, but there are tons of posts by users of both the hypertech and RC.
My cruise increases and decreases by 1 MPH with the lever. It absolutely is not “the way the computer rounds up” when using these calibrators. If that were just the way it is, it would be all over the online reviews
I can’t read

 

Are you sure your’s does not skip a few?

I just got off the road testing and mine skips 42 & 64MPH. The 42 I never would have noticed as I don’t use cruise control at that speed, the 64 I’m really surprised I had not noticed before.

 

Somehow until your comment I had been completely misunderstanding the issue at hand, even though I’ve been following since he posted. Like I thought ops cruise increments were huge, one bump went from 59 to 74…

The suppliers reasoning makes way more sense now that I understand the issue, and definitely sounds like a plausible cause.
I’ll have to check on the way home…
Thanks for taking it easy on me and my stupid comment!

 

Yeah, communications and comprehension are tough sometimes.

I thought the OP was partially bonkers at first! Until I noticed his missing speeds were precisely 15MPH apart, thus an obvious correlation was occurring. I appreciate him not trying the next 15MPH increment at 89MPH. Post #2 says it is a know problem and if I understand the OP he changed his tire size calculations and the missing speeds did change but did not go away. It will be interesting to see how my next tire size change affects my display.

At this point I am unsure if Rough County/Hypertech meant the computers we use to do the programming or the “microprocessor” within the modules are responsible for the “rounding” errors?

My computer is running Windows 10 Home Edition so I don’t think it is operating system related as the OP is using a completely different version.

 

So I set adaptive cruise at 50 and took it all the way to 70. Only number I’m missing is 53.
I wonder if it’s the same issue with normal cruise and where my next skipped number is…

 

I have now discovered that my 85MPH is also missing. Put myself behind a vehicle and kept incrementing the cruise setting. The adaptive cruise of course did not allow me to rear end the vehicle ahead of me.

So, I am missing 42, 64 and 85MPH.

I'd bet if you start off much lower like at ~29MPH and increase you will catch another missing speed. Maybe, maybe not.

I haven't tried it, but decreasing the set speed may also work.

 

Are any of you running Hypertech HW or SW? Is the result the same?