Wheels & Tires Forged | Billet | Cast | Radials | Slicks

over size wheels messing with speedometer help!

Thread Tools
 
Search this Thread
 
Old May 3, 2006 | 10:32 PM
  #1  
hatws6's Avatar
Thread Starter
Staging Lane
iTrader: (2)
 
Joined: Mar 2006
Posts: 56
Likes: 0
From: Sedalia, MO
Default over size wheels messing with speedometer help!

OK i know you guys on here never like this but i put 20's on my car. The day i put them on i had my cruise control set at 73 in a 65 and cop pulled me over and gave me a ticket for 79. so i was wandering how do i fix my speedometer for having the bigger wheels and tires. any help is appreciated guys
Reply
Old May 3, 2006 | 10:53 PM
  #2  
01RedT/A's Avatar
TECH Apprentice
 
Joined: Dec 2005
Posts: 314
Likes: 0
Default

you have to get some tuning software like hp tuners or efi live and reprogram your tire diameter.
Reply
Old May 3, 2006 | 11:10 PM
  #3  
hatws6's Avatar
Thread Starter
Staging Lane
iTrader: (2)
 
Joined: Mar 2006
Posts: 56
Likes: 0
From: Sedalia, MO
Default

will a hypertech programmer do this? for this big of a wheel and tire?
Reply
Old May 4, 2006 | 12:20 AM
  #4  
Bad Blu Formula's Avatar
12 Second Club
20 Year Member
iTrader: (3)
 
Joined: Jan 2002
Posts: 3,593
Likes: 5
From: Houston
Default

Most people get rid of their 20's when this happens. j/k man, I think that a Hypertech might be able to solve your problem.
Reply
Old May 4, 2006 | 12:28 AM
  #5  
hatws6's Avatar
Thread Starter
Staging Lane
iTrader: (2)
 
Joined: Mar 2006
Posts: 56
Likes: 0
From: Sedalia, MO
Default

i honestly kinda regret it because i lost a lot of power but i like the looks so i will have to make up the power somehow.... how can i find out for sure if the programmer will work
Reply
Old May 4, 2006 | 10:27 AM
  #6  
Roadhouse's Avatar
TECH Resident
iTrader: (8)
 
Joined: Mar 2005
Posts: 981
Likes: 0
From: Summerville,S.C.
Default

I just had my speedo corrected for the 4.10's. About any hand held programer would make it right for you or, if you know someone with a LS1 Edit, they could correct it as well. Until then, look here- http://www.f-body.org/gears/ enter the info and print the results out and keep it with you when you're driving ( you'll be using your tach to gauge your speed ) and that might keep you from getting another ticket.
Reply
Old May 4, 2006 | 10:45 AM
  #7  
JasonSS's Avatar
Teching In
 
Joined: Apr 2006
Posts: 40
Likes: 0
From: Huntington Beach, Ca
Default

20's don't mess with your speedo. tire size does though. you should be running a 285/30/20 and it is 26.7" high, the same as STOCK.
Reply
Old May 4, 2006 | 01:00 PM
  #8  
kornfreak_401's Avatar
12 Second Club
iTrader: (77)
 
Joined: Sep 2005
Posts: 1,744
Likes: 0
From: BCS/DFW TX
Default

i got a FREE tune.... ALWAYS stay 7-8 miles below the speed limit and you'll be FINE!!
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old May 4, 2006 | 02:14 PM
  #9  
Mike02Z's Avatar
TECH Fanatic
iTrader: (13)
 
Joined: Jan 2004
Posts: 1,709
Likes: 1
From: Eastern PA
Default

hmmm...wouldn't the bigger tires/wheels make the speedo read more than your actual speed?

Our cars came stock with P245/55/16's right? So if you put P275/20/20's on when your speedo says 71 you would only actually be doing 65 right? If so your speedo may have been changed by someone else before you got your car cause your numbers don't seem to compute. Or maybe I'm just not thinking correctly which is always possible.

EDIT: After checking the tire Calc. I'm wrong sorry. I had it backwards.

Last edited by Mike02Z; May 4, 2006 at 03:51 PM.
Reply
Old May 4, 2006 | 03:35 PM
  #10  
hatws6's Avatar
Thread Starter
Staging Lane
iTrader: (2)
 
Joined: Mar 2006
Posts: 56
Likes: 0
From: Sedalia, MO
Default

Man i really dont know. i know that my tire size is 255/35/zr20. and i know that i got the ticket for doing 79 when my speed was set on cruise control at 73. thats pretty much all i know. that and that i need to get it fixed haha
Reply
Old May 4, 2006 | 03:40 PM
  #11  
Xsta Z 28's Avatar
TECH Senior Member
iTrader: (2)
 
Joined: Feb 2002
Posts: 12,091
Likes: 8
From: Schaumburg, IL
Default

Your tires are too big . . . use the tire calculator:

http://www.discounttiredirect.com/di...foTireMath.jsp

The stickies are there for a reason . . .

The Hypertech will adjust for over sized tires and gear changes . . . that is about all it is good for
Reply
Old May 4, 2006 | 03:40 PM
  #12  
daryl2cb@yahoo.com's Avatar
TECH Fanatic
iTrader: (2)
 
Joined: Jul 2004
Posts: 1,882
Likes: 0
From: Greensburg,PA
Default

must have given you a ticket for the wheels, lol


don't waste your money on a hand held, get hp tune or pay to have it recalibrated.
Reply
Old May 4, 2006 | 04:50 PM
  #13  
hatws6's Avatar
Thread Starter
Staging Lane
iTrader: (2)
 
Joined: Mar 2006
Posts: 56
Likes: 0
From: Sedalia, MO
Default

and where would i get that done at i live in sedalia missouri anyone know?
Reply
Old May 4, 2006 | 04:51 PM
  #14  
hatws6's Avatar
Thread Starter
Staging Lane
iTrader: (2)
 
Joined: Mar 2006
Posts: 56
Likes: 0
From: Sedalia, MO
Default

and more importantly whats the gonna cost
Reply
Old May 4, 2006 | 05:40 PM
  #15  
umrjmac's Avatar
Staging Lane
iTrader: (2)
 
Joined: Jul 2005
Posts: 91
Likes: 0
From: Lenexa, KS
Default

PM sent - I would post up on the local fbody board and see if someone there can help you out.
Reply
Old May 5, 2006 | 01:12 AM
  #16  
hatws6's Avatar
Thread Starter
Staging Lane
iTrader: (2)
 
Joined: Mar 2006
Posts: 56
Likes: 0
From: Sedalia, MO
Default

thanks man
Reply




All times are GMT -5. The time now is 01:35 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE