Computer reprogram for wheel change
Thread Starter
Instructor
Joined: Jun 2007
Posts: 121
Likes: 6
From: san luis obispo area CA
Computer reprogram for wheel change
Hope this doesnt seem like a dumb question, but if I go with 19 & 20 wheels will I need to get my computer reprogramed to reflect correct speed etc?
Drifting
Joined: Nov 2005
Posts: 1,629
Likes: 3
From: Edmond OK
go here, plug in your original tire size and your new tire size, and it will calculate the difference.
http://www.miata.net/garage/tirecalc.html
Le Mans Master
Joined: Feb 2007
Posts: 8,514
Likes: 235
From: Currently somewhere in IL,IN,KY,TN,MO,AR,MS,AL, or FL
it depends more on your tire size than wheels. if the overall height from top to bottom is the same then no you need no re-programming. if it's taller or shorter then yes you need reprogramming.
go here, plug in your original tire size and your new tire size, and it will calculate the difference.
http://www.miata.net/garage/tirecalc.html
go here, plug in your original tire size and your new tire size, and it will calculate the difference.
http://www.miata.net/garage/tirecalc.html
Great link. That link should be in the FAQ sticky even if it is for a Miata. 
Melting Slicks
Joined: Jul 2007
Posts: 2,027
Likes: 0
From: The Lost Borough, NYC
I wondered about something... I had an 84' camaro back in the early 90's it was a V6 5spd. I added IROC rims to it and had P225's (F) and P245's (R). After mounting them on I noticed the car felt a bit slower. I think it was because the wider tires, the engine must have had to work a bit harder because the car was feeling more ground. Damn come to think of it the car handled turns rather nicely (it had the F41 suspension). I assume you might experience a similar thing if you get wider tires, I dont know for sure, just a thought.
Drifting
Joined: Nov 2005
Posts: 1,629
Likes: 3
From: Edmond OK
I wondered about something... I had an 84' camaro back in the early 90's it was a V6 5spd. I added IROC rims to it and had P225's (F) and P245's (R). After mounting them on I noticed the car felt a bit slower. I think it was because the wider tires, the engine must have had to work a bit harder because the car was feeling more ground. Damn come to think of it the car handled turns rather nicely (it had the F41 suspension). I assume you might experience a similar thing if you get wider tires, I dont know for sure, just a thought.
Race Director
Joined: Oct 2004
Posts: 10,089
Likes: 14
width doesn't affect roll out or speedometer. However if the tire is taller it is a bit harder for the car to get them rolling, I'm betting the wheel/tire combo you changed to weighed more therefore increasing rotational mass which is the worst kind of wieght you can add to a vehicle. You can eaisly tell a SOTP difference if you go from heavier to lighter wheels or vice-versa.
Race Director
Joined: Oct 2004
Posts: 10,089
Likes: 14
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