How do I recalibrate my speedometer? I just bought the car and it came with 17 in 2002 SS wheels, is this the cause of the speedo being off? Can I recalibrate it myself or do I need to take it to a shop. Is inexpensive or....? Thanks in advance for all the input. Cory

 

It's done via the PCM if you have a '94-'97.

Anyone with a PCM programmer can do it (including myself, email me if you're interested).

'93s, however, I believe use a gear or something of the sort up near the speedo? It's not PCM based as far as I know...

 

What year car do you have? What is the tire size? Why do you think the speedo is off? All Camaros are not created equal.

 

its 95Z M6, the speedo is of by 10mph on thw HWY, the faster you go the off it goes, so no i don not think it is because the camaro was not "created equal".

 

i have 17's, speedo is fine. Depends on tire size. We need to know wut tires u have. Example stock is 245/50/16 and I have 315/35/17's and they are the pretty much the same DIAMETER as stock.

 

It is a very simple procedure if you have a computer and a cable that connects to your PCM port. Otherwise, you'll need www.pcmforless.com (Bryan)... I think he is about $100 plus he upgrade other stuff on your computer which is who I originally went with. Also, www.madz28.com does custom progamming (MadWolf). He seems to have a good reputation too.

 

"93s use a gear to correct speedo not programming like '94 up, get my drift?

 

The tire size is 245/45/17. Can this be done at a local dealer?

 

The tire you have is only .1" smaller than stock. That wouldn't make that big of a change in the speedo. If the previous owner installed 3.73's then it would be off about 10mph.
Don't know about the dealer.

 

nope, it has factory gears

 

Something is wrong if you are off by that much on stock gears and tires that are sooooo close. Programming might help, but something is definately wrong. It isn't difficult to re-program if you can get a program..... otherwise, I wouldn't count on a dealer. Perhaps your seller had different rims on, then swapped them when he sold it which accounts for the different MPH...

 

What changes need to be made in TunerCAT for this to work? I was looking around and I couldnt really figure out how to change for my 4.10's so I just used my hypertech but anyway also, what numbers would i use when i go changing things? Thanks.

 

I don't have my laptop with me (I'm at work). but you can flip through the TABS to get to the tire section. I believe it is the last tab on the bottom row. Then there is a section that accomodates Tire Size and Gear Ratio. Also, you can really fine tune the tire rotation with the RPM (Rotation Per Mile) tab... (can't off hand remember the exact title)... essentially, it is the number of rotations the tire will make in a mile. You can go to Tire Rack.com and get the specifics. I've got SZ50s at 245/50R16 that are rated at 811 RpM. So, I punch in 811 with 4.10 gears.

Make sense? If not, I'll check the laptop later and get the details. But that is how it is done (it's been a few months and too many beers) as best as my memory serves.

 

cz28s, how do you know your speedo is off?

________________
Rob
1994 Firehawk#319
11.83@120.61
Slightly Modified
1996 Blown V6
2002 Trailblazer
San Diego F-Bodies
"What do you mean, "I hurt your feelings"? I didn't know you had any feelings."

 

i know the speedo is off because when i drove it back home the person that was in the other car that we went to pick the car up in told me how fast she was going and thats not what my speedo was reading. that was on the HWY i was reading 60 and she was doing closer to 70. the higher the speeds the farther off it goes. like if im on the city streets 35mph limit the it reads about 31 and im actaully doing 35. catch my drift? anywho i think its just the wheels and im tryin to find someone local to reprogram it for me.