35" Tires, 4.88 Nitro Re-Gear and a Hypertech Inline Speedo Calibrator

Has anyone successfully upgraded their 2017 TRD OffRoad from stock-to-35" Tires, Installed a 4.88 Nitro re-gear and used a Hypertech Inline Speedometer Calibration unit - Successfully?

I've posted similar thoughts in other forums, but wanted to start fresh here. I've having considerable difficulty with ABS/VSC and unable to get into 4WD - shop doesn't know what's going on, even after using a software scanner.

Looking for help. Waiting to talk to Hypertech technical support and will update once I have a convo. Beyond frustrating, just sayin.

As far as the Hypertech, only entering Wheel Diameter changes allows the speedo to correctly register, but still get ABS/VSC and no 4WD. When I ADD to the program the 3.91 - 4.88 new gear ratio, still get ABS/VSC errors and now speedo reads slower again, as if the unit wasn't installed.

We've unplugged the battery for 5 mins to try and "reboot". Didn't fix. The shop that did the work used a scanner and originally got a code that a right front ABS sensor was bad and they replaced it, codes cleared. Will probably go back down there tomorrow and try to troubleshoot it again. But we're getting to the point where they don't know WTF is wrong and don't know how to fix. I need someone who know's what they're doing, for real.

 

I think @mesojdm has 35"s and 4.88s and got speedo cal.

 

Thanks - reached out.

 

@90yota

 

Thank you as well.

 

I've got 35's and the hypertech. It's programmed with new wheel diam. And left the gear box unchecked.
I have 4.88's but haven't got around to installing them. I don't have any error lights right now. Do you have the older hypertech speedo calibrator with a mini PC board with a wire IN and wire OUT. Or the newer one which is just a black box with a single harness?

 

Thanks for the reply. I have the new Hypertech without the board, just black box and single female/male harness. I did not have these issues until after the 4.88's were installed. Speedo was slow, but no lights and 4WD worked fine. Put in the 4.88's, the dash lit up and then was told to purchase the Hypertech to fix. Trying to figure this all out.

 

Oh, I did have the previous Hypertech with the mini-board and tried all combinations of plugging. As part of my troubleshooting, I thought maybe the Hypertech was defective, so sent back and they sent me this new one. The problems persist exactly as before.

 

Who did the gears? Did you purchase parts, or did the shop that did the work provide them? To me it sounds like possibly mis-matched ratios if the issue persists with or without the hypertech and became an issue only after they did the gear ratio change.

 

I bought the Nitro gears and master install kits on the group buy from this forum, had them shipped to my place and brought them to the shop. SWAT Customs in Fremont, CA.

 

Sounds like it's something to do with your ABS wire. But said you put a new one in the code cleared? I'm confused

 

I understand the confusion. Yes, last Friday, I went to the shop (an hour away) and when we hooked the truck up to a scanner, it kicked out a code saying the right front ABS sensor was not reading. The shop bought and installed a new one, and "cleared the codes". The truck switched into 4WD, no lights on the lift. Hypertech installed with ONLY the wheel diameter info (gear data left blank). Brought the truck down, turned it on, then at about 5mph, the lights kicked on again. The shop swore that the gear info HAS to be put into the Hypertech. We tried to do it right there and then, but the Hypertech website download wasn't working all day and Hypertech support was not answering the phone all day. Not sure what else to do other than go back to the shop, I have the program saved on a laptop now and we'll see what we get with a scanner, Hypertech unit programming. etc. tomorrow.

Hope that all makes sense?

 

That makes more sense. Is the hypertech absolutely necessary? I've been running without it calibrated and I just make sure to drive 5mph slower than what the Speedo says.

 

Good question - to be honest, I don't know that the Hypertech has anything to do with the problem of the ABS/VSC and 4WD. Without the Hypertech installed, the same lights and non-functional 4WD issue was happening. I've just been told that it's required by the shop. I haven't learned enough to know how-or-if it affects anything else (shift points, for ex) in the truck other than the Speedo needle.

FWIW - the faster you drive, the more divergent the speedo is. For ex, 20MPH indicated is really 22mph or so (tough to tell). 50mph indicated is really 60mph, etc. I have an aviation app that tracks groundspeed, so I can see quickly the differences.

THanks to you and others for the help. Its making a difference as I try to get my head around identifying root cause and the solution. Working the problem.

 

In the Tacoma the Hypertech is a conversion tool. It only changes the readouts in the cluster, thus not affecting shift points, etc. Allowing for your Speedometer and Odometer to reflect the new, corrected, distance traveled and speed traveled. This is specific to Toyota, as in other manufacturers (Ford and Jeep for example) the Hypertech acts like a programmer to flash the vehicles computer which does accommodate for tire size, gear changes, etc and affects shift points and other programming, not just cluster readouts

 

Thank You, that's important to know. Bottom line, the Tacoma does not use any of the data as 'calculated' to do anything other than speedo/odo read out. It's only doing 'display information', not anything else. It is not a cause to any other effect for anything else other than the speed dial.

 

Correct, and this is also why you won't need the gear input in the Hypertech. Wheel speed is what's calculated, not transmission or other factors from all the research I can gather.
The truck feeds the cluster a variable, and the Hypertech converts that variable with the % increase in tire size to properly display speed and mileage.

 

Ok, so I will now rule out the Hypertech as a suspect in my ongoing issues. I still have ABS/VSC lights on and an inability to shift into 4WD (and just realized the BSM is now not working.) No idea why this is happening (and apparently the shop doesn't either). The one thing they did say was that when they 'cleared the codes' with the truck on the lift, the lights stayed out and they were able to shift into 4WD. Yet on the ground, at about 5mph, bing - lights come back on and problem returns.

 

I'm not sure of the ECU differences between 16 and 17, but my 16 has that exact setup (4.88, 35, hypertech) and working perfectly with no warning lights.

Maybe the frame side connector or wiring for the ABS sensor that is throwing codes is bad?

 

Incidentally, when I was driving back from the shop on Friday, I left the Hypertech dongle attached with the programmed unit removed. The dash was lit up like a xmas tree, and the tach/speedo pinned at Zero, they were non-funcitonal. The truck drove fine for all other purposes. The odo was displayed, but did not change during the drive ("free" miles on the truck). Once I got home, I plugged in the unit, drove around the block and everything other than my ABS/VSC returned to normal operating functionality.