IS THERE SOME SIMPLE METHOD OF CORRECTING MY SPEEDOMETER WITH MY 33 INCH TIRES? CAN I JUST WHISPER TO THE ECM WHAT SIZE TIRES I HAVE? THANKS FOR ANY HELP.

 

You can purchase a Superchips Microtuner from your local truck accessories store or order one online at superchips.com. The microtuner has three HP settings- 40,50, & 70 hp. It also has a ECM Code reader and allows you to reset the computer if you are displaying a trouble code (It also has a book that dispays what the codes are). It does have a menu to adjust your tire size. It is a basic procedure; just measure your tire hieght and enter it into the microtuner and it will adjust your speedometer to be accurate.

 

there is an equation that you can use to calculate your speed if you dont want to spend the $$ on any equipment. I cant remember the equation, but you can do a search for it. Overall, no matter what tire size you decide to go w/, the difference is usually no more than 10%, so most people on this forum can do that in their head. just my $.02.
Hunter

 

Couple of options that I explored.

The math thing, with a $5 calculator from you local "superstore". If you have not changed your gears, simply divide new tire diameter by old, and then multiply what you see on the speedometer. In my case, 35/29 = roughly 1.20, or 20% increase. Or inverting, take what you see on the speedo, divide by 5 and add to the original number. IE - I see 25 on the speedo, I am running (25/5)=5 and added to the reading, I get 30. So I got used to 25=30, 30=36, 35=42, 40=48, and so on.

Next, get a good GPS. I like the Garmin models personally.

Either way you save money over the Superchips deal.

Yeah, I am a geek!

Matt

 

THANKS MATT FOR THE MATH. I ALREADY NEW THAT. I EVEN HAVE THE GPS, BUT WHILE I SEE BLUE LIGHTS COMING, I CAN'T ADD & MULTIPLY, & LOOKING AT MY GPS WOULD TAKE MY EYES OFF THE ROAD. HOW MUCH IS THE SUPERCHIPS DEAL? WILL IT STACK ON TOP OF ANY OTHER BOX LIKE I ALREADY HAVE? IF STACKED DOES IT REALLY IMPROVE ANYTHING? THANKS

 

The superchips box is only plugged in when you need to change information/parameters in the truck's onboard systems.

http://www.superchips.com/html/mainpage/index.htm

http://www.superchips.com/html/installation/index.htm

 

You could also try the Superlift true speed adapter.

 

Stake,
Ya got a link to it?
I need one now that I changed from 215s to 235s.

 

I got mine from 4wheel parts wholesalers.

 

Didn't mean to insult at all. Was just providing some material in response to Hunter's post. Plus, like I said, I am a geek!

I agree! I sure as heck ain't trying to run a calculator and drive at the same time.

I ran the numbers and memorized the results. Also, when the speedo is running even multiples of 5 the math is pretty quick. No doubt it is still much nicer to look at the speedo and get the visual answer right off the gauge.

Oh, did I say I am a geek!

Matt

 

MATT HOW DO YOU LIKE THE SSR TIRES YOU HAVE? DID THEY BY CHANCE BALANCE UP GOOD, OR ARE THEY LIKE EVERY OTHER INTERCO PRODUCT & OUT OF ROUND?

 

Hey CAPTDASH:

I really like them. They are performing great. Balance is great and the wear is much better than I expected. I do keep them rotated every 5k though. On road, I have no wobbles, and off road the only problem I have is the sides of the truck getting a "little" dirty!

Also, the ones that I am running are 35" X 12.5" X 16.5" diameter 10 ply radials. Load rated E.

I really am happy with them.

Matt

 

TrueSpeed Calibrator

I have had mine for about 2 years now. Instructions said to mount it in the cab, but I mounted it under the hood. Even with all the abuse under the hood it has never given me any problems.