Really noob tire question - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Abygale · 10-23-2009, 03:19 PM

I have the V6 with the RS package so the 20 inch high performance P-zero summer tires. I understand that the speed limiter based on the current tires is 155 mph. If I change to 19" tires and wheels will that decrease the speed limiter setting? How does that work?

I read something that said the speed limiter was 115 mph on the non-RS V6 cars but don't know if that is the 18" or the 19" wheels and tires. Any information is greatly appreciated! Thanks

Mr Twisty · 10-23-2009, 04:47 PM

Different tires won't change the limiter setting, but if it's a smaller diameter tire your speedometer will read faster than your actual speed.

A tire is designed to run at a certain max speed, you could put a 115 mph tire on your car, and your car will still do 150 mph, but even tho your car is capable of higher speeds you could risk shredding that particular tire over 115 mph.

Abygale · 10-23-2009, 04:50 PM

Thank you! So basically it's the rating on the tire that matters, not the size? If I go to a smaller tire, what is required to get the MPH to read correctly again?

ShnOmac · 10-23-2009, 05:04 PM

Quote:

Originally Posted by Abygale

Thank you! So basically it's the rating on the tire that matters, not the size? If I go to a smaller tire, what is required to get the MPH to read correctly again?

Just have to have someone reprogram the calibration! Some tire shops have the ability to do it or any speed shop can do it for ya!

Mr Twisty · 10-23-2009, 05:12 PM

Quote:

Originally Posted by Abygale

Thank you! So basically it's the rating on the tire that matters, not the size? If I go to a smaller tire, what is required to get the MPH to read correctly again?

Yes, that's why those Pirelli's are so expensive! Here's a good post about tire speed ratings...
http://www.camaro5.com/forums/showth...e+speed+rating

You'll probably need to get with your dealer on the speedometer, it's my understanding the V6 computer is a tough one to hack. When guys talk about 'tuning' their cars, they're using a programming device that is capable of hacking the cars computer and changing that parameter, along with many other enhancements that are stored there.

Abygale · 10-23-2009, 06:15 PM

Thanks guys....I appreciate the help

Yes, that 'tuning' thing on the V6 sounds like a real PITA, and is holding a lot of good after market mods/parts up for us :(

Mr Twisty · 10-23-2009, 07:10 PM

Quote:

Originally Posted by Abygale

Thanks guys....I appreciate the help

Yes, that 'tuning' thing on the V6 sounds like a real PITA, and is holding a lot of good after market mods/parts up for us :(

Lingenfelter can get in it I bet'cha

... I like the new avatar

Abygale · 10-23-2009, 07:34 PM

Quote:

Originally Posted by MisterCamaro69

Lingenfelter can get in it I bet'cha

I'm counting on it

... I like the new avatar

Thanks! That's my Halloween costume. I'm going as the Baroness from GI Joe. It's a pretty fun costume.....airsoft guns and all!

.

Doc · 10-23-2009, 08:32 PM

Depending on the speeds you plan on running, a decent high performance summer tire will handle normal driving easily. Tire rating determines the maximum speed the tire can safely handle; size doesn't matter really, it's what the manufacturer rates their tire at.

Going with a smaller tire than stock just requires a speed shop to reprogram the computer for the correct speedometer reading. It's also a good idea to have an alignment done so the car is correctly setup for the change in wheel size.

Abygale · 10-23-2009, 08:48 PM

Thank you Doc. I may be taking the car on the track some, possibly as early as next weekend. I really wanted to get some 19" tires and wheels put on it at some point soon and I want to make sure I understand the ramifications!

Thanks again!

Doc · 10-23-2009, 09:14 PM

You go Aby!! The Hankook Ventus V12 Evo comes in a 275/40-19 which I got for $175 each and is able to handle your "need for speed" hehe. Pretty soon your sig will change to you posing with trophies on the hood of your car...just you watch.

Abygale · 10-23-2009, 09:20 PM

Quote:

Originally Posted by Doc

You go Aby!! The Hankook Ventus V12 Evo comes in a 275/40-19 which I got for $175 each and is able to handle your "need for speed" hehe. Pretty soon your sig will change to you posing with trophies on the hood of your car...just you watch.

LOL...maybe! If someone would have told me three months ago that I would think about racing cars in any fashion, I would have said no way! Goes to show you that really anything is possible!

Doc · 10-23-2009, 09:23 PM

Quote:

Originally Posted by Abygale

LOL...maybe! If someone would have told me three months ago that I would think about racing cars in any fashion, I would have said no way! Goes to show you that really anything is possible!

Knowing how competitive you are, I'll be very surprised if you don't hehehe. Competitive driving is such a blast and so addicting; there's always "next race" and your mind filled with all the things you need to do, want to do, should do, won't do again lol.

600hp-lpe · 10-24-2009, 08:36 AM

Quote:

Originally Posted by Abygale

Thank you! So basically it's the rating on the tire that matters, not the size? If I go to a smaller tire, what is required to get the MPH to read correctly again?

If you go to a smaller tire, your dealer can reprogram for you.

If you have a TUNE from LPE, you would want them to set it for you.

The setting is in the computer and can be adjusted with a programmer.

I will have LPE do mine...

10-23-2009, 03:19 PM	#1
Abygale Drives: . Join Date: Jul 2009 Location: . Posts: 2,523 View My Garage	Really noob tire question I have the V6 with the RS package so the 20 inch high performance P-zero summer tires. I understand that the speed limiter based on the current tires is 155 mph. If I change to 19" tires and wheels will that decrease the speed limiter setting? How does that work? I read something that said the speed limiter was 115 mph on the non-RS V6 cars but don't know if that is the 18" or the 19" wheels and tires. Any information is greatly appreciated! Thanks

10-23-2009, 04:47 PM	#2
Mr Twisty Drives: the 2nd amendment home Join Date: May 2008 Location: OK Posts: 14,707	Different tires won't change the limiter setting, but if it's a smaller diameter tire your speedometer will read faster than your actual speed. A tire is designed to run at a certain max speed, you could put a 115 mph tire on your car, and your car will still do 150 mph, but even tho your car is capable of higher speeds you could risk shredding that particular tire over 115 mph. __________________ "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -- Benjamin Franklin

10-23-2009, 08:32 PM	#9
Doc Dances With Mustangs Drives: 2010 1SS/RS MT Join Date: May 2009 Location: USA Posts: 3,819 View My Garage	Depending on the speeds you plan on running, a decent high performance summer tire will handle normal driving easily. Tire rating determines the maximum speed the tire can safely handle; size doesn't matter really, it's what the manufacturer rates their tire at. Going with a smaller tire than stock just requires a speed shop to reprogram the computer for the correct speedometer reading. It's also a good idea to have an alignment done so the car is correctly setup for the change in wheel size. __________________ Blue Angel is here!! 1SS/RS LS3 M6 IBM

10-23-2009, 09:14 PM	#11
Doc Dances With Mustangs Drives: 2010 1SS/RS MT Join Date: May 2009 Location: USA Posts: 3,819 View My Garage	You go Aby!! The Hankook Ventus V12 Evo comes in a 275/40-19 which I got for $175 each and is able to handle your "need for speed" hehe. Pretty soon your sig will change to you posing with trophies on the hood of your car...just you watch. __________________ Blue Angel is here!! 1SS/RS LS3 M6 IBM

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10-23-2009, 04:50 PM	#3
Abygale Drives: . Join Date: Jul 2009 Location: . Posts: 2,523 View My Garage	Thank you! So basically it's the rating on the tire that matters, not the size? If I go to a smaller tire, what is required to get the MPH to read correctly again?

10-23-2009, 06:15 PM	#6
Abygale Drives: . Join Date: Jul 2009 Location: . Posts: 2,523 View My Garage	Thanks guys....I appreciate the help Yes, that 'tuning' thing on the V6 sounds like a real PITA, and is holding a lot of good after market mods/parts up for us :(

10-23-2009, 08:48 PM	#10
Abygale Drives: . Join Date: Jul 2009 Location: . Posts: 2,523 View My Garage	Thank you Doc. I may be taking the car on the track some, possibly as early as next weekend. I really wanted to get some 19" tires and wheels put on it at some point soon and I want to make sure I understand the ramifications! Thanks again!