Rough country inline speedometer calibrator

Anyone on here use this guy to correct after installing 35’s or bigger?

 

I’ve never seen that one mentioned here.
I have seen most people talk about the Hypertech calibrator.

However, I read recently that YellowBox now offers a plug and play version for Tundras. That’s what I plan on going with. Mine is only off by about 3-4 MPH so it’s not a huge priority.
I do have a YellowBox in my Tacoma, though. Had it for almost 10 years. Great product, best price, awesome customer service.
https://yellr.com/ordering.htm

 

I’ve heard of the yellow box ones. I think just just go inline with the Hall effect sensor to correct the output of the sensor. The hypertec and supposedly the rough country one programs it to the exam/pcm? Doing it that way in theory wold correct shift points along with speedo/odo. But I didn’t know yellowbox made one for the tundra.

That hypertec is pricey. But the rough country one brings it down enough for consideration

 

Will this work on the 19 Tundras, even though it says 14-18, how much different can the 19s be?

 

I’m not sure, I went ahead and ordered it as my 35’s will be in next week. So I’ll report when I get done installing them and this guy. It looks just like the hypertec one pretty much

 

Great let me know how it works out!

 

Apparently rough country speedo correct uses Hypertech’s program. So it’s pretty much the same thing for $100 cheaper.


I’ll install tonight or tomorrow

 

Awesome!

 

Installed it and compared to several gps devices as well as interstate radar (ones in speed traps or construction zones). It made my speedo spot on when compared to all devices. I am less than 1mph different.

 

have you noticed a difference in shift points at all? does the truck react differently?

im looking into these now lol

 

feels like it drives just like I had the stock 285/55r20’s. Slightly slower accel from the added weight maybe but prob not by much. I don’t have shifts that seem like they take longer. Up-shifts and down-shifts all about like normal (had the truck stock for 50k miles) to me.

 

sweet. thanks for the feedback.. I'm running 40s on stock gears and a stock speedo.. so I'm way out of wack

 

Tyler you might look into a gear change if your going keep the 40s on for a bit.

 

its on the list, but trying to avoid the 2-3K

 

I'm in the process of installing 4.88s/Auburn right now, trying to keep it below $2,000 is not easy.

 

yeah, thats why i havent bitten the bullet yet

 

I don't have any input on the product you posted OP but just wanted to add that I find it strange that my new 19 XP with 20's and offroad wheels MPH is off even from the factory. I have a radar on a street near me and it reads that I'm going slower than my Tundra is reading. I am kind of stunned that even from the factory, Toyota didn't recalibrate these trucks with factory packages.

 

just ordered my rough country.. hopefully here this weekend, really excited to see what it does!

 

You could always re-gear just the rear end first. At least that would bring your road/ highway power back while your wallet recovers.
Obviously you would want to make sure not to use 4x4 for any reason until they are both re-geared.

They are mostly all off from the factory. Having the speedo read a little faster than actual removes liability from Toyota in the sense that you can't blame them for getting a speeding ticket.

 

yeah, ive pretty much thought of everything and every loop hole lol but i think we'll give this a shot and see what happens. Once the truck goes under the knife, ill get it all done at once

 

Good call, IMO. I'd hate to lose 4x4, cuz I KNOW that would be when I needed it. Better to only have it in the shop once instead of twice anyway, right?

 

yeah, that's a pretty decent install. So sure as hell dont want to go through it twice.

 

ya I hear 40’s is when everyone re-gears. I think some 37’s do. I might re-gear but if I do it’ll be for lockers. It hasn’t really bogged down with the 35’s but I bet the 40’s make it feel different for sure

 

Its actually not that bad.. yeah power is lost and the speedo is light years off, but I don’t tow anything at the moment, so the truck isn’t struggling. I drive about 55 miles a day at most and it’s 80% all highway.

Sometimes I ask myself, why do I even have 40s..? Lmao

 

@fundratss how was the install? Pretty easy? Just got mine in the mail, but haven’t looked at it yet

 

make sure to program it first. And then also leave the program cable hanging down. Wasn’t hard. Pop off the lower trim and let them hang (don’t take them all the way off) then unscrew the cluster and unplug it. Plug the box in and put all back together. Took me about 5 mins

 

As far as the computer aspect, anything to be aware of? Other than the windows thing lol

 

Pretty straightforward. I downloaded it from rc website and punched in the numbers and was good there. I just left the program cable in for the just in case it was off and I needed to change the numbers some

 

Thanks bro.. im gonna try and do it all this weekend. Big things coming lol

 

Any update if this has worked for a 2019 or 2020 model successfully?