I am curious about this also.

 

There should be a lot of info on the subject if you look around here. I had one on my '07 and it corrected the speedo like advertised. Where I disagree with many others is about the shift points. All it does is take the speedo input and then recalculate it on the speedometer. I'm not sure how an inline change to the speedo gauge would change shift points?? I'm certainly not an expert though :dunno:

 

I have a Hypertech installed on my 2014 5.7 SR5. I have 18's and 295 Trail Grapplers installed on a 3" level. After the mods, my speedo was about 3-4 mph off. It wasn't enough to make a huge difference, but it bothered me nonetheless. I never had any problems with shift points out of sync. That said, the Hypertech corrected my speedo, and subsequently my MPG calculations. It may be a little on the pricey side, but it's a good piece of gear.

BTW, the software only works on PC, so take that into consideration if you're a Mac guy.

 

Have it with my 295's and glad I got it. Easy install and works great once dialed in correctly. Putting in actual tire size usually gets you close but you can dial it in to be more accurate. Make sure to leave the USB cable attached when you install it, just secure the cable behind the dash or something, that way when you want to recalibrate you don't need to pull the dash apart again.

 

I went 40+K on my 07 after lift and larger tires without the hypertech- once i finally installed it I was pissed I didnt have it on before. the hypertech DOES change your shift points and this is huge for me seeing as I live in the mountains and tow regularly for work. My hwy fuel economy went up about 1.5 MPG's.

I had one installed on my 14 two weeks after purchase (came lifted with my old wheels and tires) and noticed the same increase in mileage and shift points.

 

All right! Thanks for the replies! Guess I will be adding this to my build list too!

 

DO IT. It woke my truck back up after the install of my 295's. Brings everything back to stock, or at least tricks your ecu into thinking so.

 

I put mine on about a week after I did the 6" lift with 295/65/20's.. I noticed the speed off roughly 6MPH.. I got the speedo corrected which put me at ease, and the hunting for 6th gear got better, but did not go away.. At about 75MPH, if I hit a little bit of an incline, it generally downshifts into 5th.. Before the calibrator, I could not get it to stay in 6th to save my life lol.. I will be doing the 4.88s whenever I have the extra funding, which I know will solve the 6th gear issue..

 

I have one on the workbench waiting to be installed.......if you download the software off the site be sure to use winzip to unpack it.......winrar gives errors.

 

This is an old thread I know, but I'd like to hear from someone in addition to "dexter" in regards to how the recalibration affects the ecu or ecm. I recently had a 6" lift and 35" put on my 2014. It felt ok, but draggin a little. Could really feel the weight and circumference on the 35's. I put an auburn lsd and 4.88's in and things got a lot better. It actually holds 6th gear now on the freeway like it did when it was stock. In fact, I'm not really noticing anything negative about the performance after the gear change to 4.88s. Yes, my speedo is about 4mph off, but that's not enough for me to justify the $188 for the hypertech calibration. . . . UNLESS the Tundra's ecu takes into account the mph showing on the dash when it decides timing advance, fuel, etc. . .
Does anyone know for sure whether the Tundra's computer takes this into account or are we just correcting the mph and odometer for $188. HYPERTECH? Do you know the answer? "Dexter" mentions the 1.5 mpg increase, but I'm pretty sure that's because the odometer was corrected. I'm guessing it has nothing to do with the performance of the truck. I seriously would love it if I'm wrong. If the computer does use the indicated mph to adjust everything else (transmission, spark advance, vvti, etc. . ) I would GLADLY spend the $188 to correctly return the truck to stock programming.
Please someone weigh in here. Hopefully HYPERTECH with some concrete facts. Or maybe the propeller head that engineered the Tundra's ecu.

Thanks,

Danbo

 

I cant speak for Toyota specifically but i DO have a decent amount of programming experience with GM ECU's (PCM'S... same thing, car computer)

ASSUMING that Toyota uses similar methods to make and program the computer, then Yes.... the calibrator could indeed effect shift points.

Here's why I say that:

When I would go into the "charts" or files of the GM (Grand Prix GTP) I would have access to different tables where it would cross reference 2 items to calculate a 3rd.

For example: MPH vs RPM to calculate timing degrees

So it would have on the right side MPH and across the top RPM.. in each "box" of the table would be what the PCM was following for the timing advance at those specified values ("X" rpm and "Y mph).

The SAME type of table was used for shift points.

I remember thinking it was funny that the car used MPH and not rpm to calculate when it shifted... but yep.. it DID use the MPH. I have no idea why, but it did.

So when I wanted to change the shift point to a few hundred rpm more, I would go to the shift settings and increase the MPH from the 60mph to 62.5 and test it... yup, shifted later.

If thats similar for our trucks, and the ECU thinks we are traveling a a slower speed than we actually are, it would be shifting later than we would be stock.

Now, who knows if this is the same for Toyota. I would guess that if people are reporting improved shifting after the Hypertech, its very likely. Maybe the exact calculations/tables arent the same, but it sounds like they may use MPH to calculate shifts.

I dont know if this would effect timing or anything like that very significantly, as the values are most likely very very close within a 4% difference in mph... but for shift points it may be enough to notice.

I agree that the 1.5 mpg gain was just the pcm getting fixed to read the correct mpg.. not an actual gain.

Just my 0.02 .. hope that makes sense.

 

That was quick! Thanks bigD. Yep, it totally makes sense. I appreciate your input. Void of someone else contradicting your input with absolutes specific to toyota, I'll probably purchase the hypertech setup and let you know what I think.

Thanks again. If there's any Hypertech reps that no the answer for sure, I'd still like to hear from you as well.

Thanks,

Danbo

 

Yes the hypertech uses mph to change shift points. When you go from a 32" tire to a 35" tire you will be traveling fast with the larger diameter tire to read the same mph on the speedo. The computer tells the tranny to shift based on mph. So if you have to be doing say, 64 with 35"s to actually have the speedo read 60, then you shift point will be delayed as the guy above was saying. The hypertech intercepts the signal from the gauge cluster to the ecu and filters the info the speedo is sending to the ecu, based on your imputed tire sizes, and brings the info back to a stock configuration or so the ecu "thinks". This makes the truck accelerate, shift and cruise like stock. It also stops the tranny from most of the gear searching as well. It's well worth the coin

 

I found that measuring the actual height of my new tires was more accurate than just entering the old and new sizes. I didn't notice a change in shift points but I was only going from 32" to 34".

 

Yeah I did the same thing, getting the actual diameter of the tire. Way more accurate.

 

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