Go Back   Corvette Forum > C6 Corvette, 2005 - 2013 > C6 Tech/Performance
Sign in using an external account
Register Forgot Password?
Register Search Today's Posts Mark Forums Read FAQ Vendor Directory
Search
C6 Tech/Performance
LS2, LS3, LS7, LS9 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace Sponsored by
21st Century Muscle Cars

Reply
 
 
 
 
Thread Tools Search this Thread
Old 11-08-2009, 03:13 AM   #1
SubSolar
CF Senior Member
 
SubSolar's Avatar
 
Member Since: Apr 2009
Location: Corona CA
Send a message via AIM to SubSolar
Default Do I need to change shift points on 09 A6 if I run drag radials?

I was all set to buy some C5 replica 17x9.5 wheels and a pair of 275/40/17 MT ET Street Radials for my 09 A6. Then I ran across some threads saying that this caused them to hit the rev limiter because it's 0.4" smaller in circumference than the stock tires. Does this happen to all C6 A6's? I have 2.56 gears, not sure if that makes a difference. I really don't want to do have a separate tune just for the dragstrip. Is there another drag radial wheel/tire combo that is close enough to the stock diameter?
__________________
2009 Corvette A6, Victory Red, bone stock dyno: 373.8 rwhp / 364.5 lbs. torque
1987 Buick Grand National
Dyno run: http://www.youtube.com/watch?v=qghTd47KOgY&hd=1
SubSolar is offline   Reply With Quote
Old 11-08-2009, 07:11 PM   #2
thesubfloor
CF Senior Member
 
thesubfloor's Avatar
 
Member Since: Jul 2007
Location: Brentwood World's first A6 in the 9's (including N/A, blower, turbo and nitrous cars) 9.950@139.267 CA
Default

Quote:
Originally Posted by SubSolar View Post
I was all set to buy some C5 replica 17x9.5 wheels and a pair of 275/40/17 MT ET Street Radials for my 09 A6. Then I ran across some threads saying that this caused them to hit the rev limiter because it's 0.4" smaller in circumference than the stock tires. Does this happen to all C6 A6's? I have 2.56 gears, not sure if that makes a difference. I really don't want to do have a separate tune just for the dragstrip. Is there another drag radial wheel/tire combo that is close enough to the stock diameter?
Yes, with running a different tire size you'll need to definitely change your shift points.

There are tire sizes that are closer to your stock tires but I've run several different sizes (and types) of drag radials and contrary to popular belief, wider is not always better. I used to think that the MT ET Street radials were the best out there until I started running Hoosiers and wouldn't consider using anything else now. With Hoosiers not only do they hook better than the MTs, they will actually rehook if you don't get a good launch.
thesubfloor is offline   Reply With Quote
Old 11-08-2009, 07:17 PM   #3
Tony B4
CF Senior Member
St. Jude Donor '08
 
Tony B4's Avatar
 
Member Since: Sep 2006
Location: Cheektowaga NY
Anthony Belcer IV
Default

Quote:
Originally Posted by thesubfloor View Post
Yes, with running a different tire size you'll need to definitely change your shift points.

There are tire sizes that are closer to your stock tires but I've run several different sizes (and types) of drag radials and contrary to popular belief, wider is not always better. I used to think that the MT ET Street radials were the best out there until I started running Hoosiers and wouldn't consider using anything else now. With Hoosiers not only do they hook better than the MTs, they will actually rehook if you don't get a good launch.
Also hoosiers are the lightest drag radial out there. I cut 1.53 with stock 2.56 gears. The size I ran with the hoosiers were 315/30/18 and the tire had a diameter of 26.00. The stock runflat is 26.64, and thats why your really need to adjust your shift points.
Tony B4 is offline   Reply With Quote
Old 11-08-2009, 07:20 PM   #4
SubSolar
CF Senior Member
 
SubSolar's Avatar
 
Member Since: Apr 2009
Location: Corona CA
Send a message via AIM to SubSolar
Default

Damn, there's no 26.4" drag tires? How do you switch the shift points at the track anyway, do you need your own hp tuners software and laptop? I didn't realize it was so much work just to run down the track occasionally. I don't want to void my warranty with a tune just now.
__________________
2009 Corvette A6, Victory Red, bone stock dyno: 373.8 rwhp / 364.5 lbs. torque
1987 Buick Grand National
Dyno run: http://www.youtube.com/watch?v=qghTd47KOgY&hd=1
SubSolar is offline   Reply With Quote
Old 11-08-2009, 07:23 PM   #5
Tony B4
CF Senior Member
St. Jude Donor '08
 
Tony B4's Avatar
 
Member Since: Sep 2006
Location: Cheektowaga NY
Anthony Belcer IV
Default

Quote:
Originally Posted by SubSolar View Post
Damn, there's no 26.4" drag tires? How do you switch the shift points at the track anyway, do you need your own hp tuners software and laptop? I didn't realize it was so much work just to run down the track occasionally. I don't want to void my warranty with a tune just now.
Yes the Mikey Thomspon dr's 305/30/18's have a tire diameter of 26.4
Tony B4 is offline   Reply With Quote
Old 11-08-2009, 07:26 PM   #6
SubSolar
CF Senior Member
 
SubSolar's Avatar
 
Member Since: Apr 2009
Location: Corona CA
Send a message via AIM to SubSolar
Default

Quote:
Originally Posted by Tony B4 View Post
Yes the Mikey Thomspon dr's 305/30/18's have a tire diameter of 26.4
Sweet, what width wheels do people use for those? Do people use front C6 replica wheels?
__________________
2009 Corvette A6, Victory Red, bone stock dyno: 373.8 rwhp / 364.5 lbs. torque
1987 Buick Grand National
Dyno run: http://www.youtube.com/watch?v=qghTd47KOgY&hd=1
SubSolar is offline   Reply With Quote
Old 11-08-2009, 07:31 PM   #7
Tony B4
CF Senior Member
St. Jude Donor '08
 
Tony B4's Avatar
 
Member Since: Sep 2006
Location: Cheektowaga NY
Anthony Belcer IV
Default

Quote:
Originally Posted by SubSolar View Post
Sweet, what width wheels do people use for those? Do people use front C6 replica wheels?
Here is the link for the tires http://www.mickeythompsontires.com/s...StreetRadialII

If your going to run 18's, check out ebay. Or if you want drag wheels, CCW makes some of the best, but they cost.
Tony B4 is offline   Reply With Quote
Old 11-08-2009, 07:40 PM   #8
SubSolar
CF Senior Member
 
SubSolar's Avatar
 
Member Since: Apr 2009
Location: Corona CA
Send a message via AIM to SubSolar
Default

Quote:
Originally Posted by Tony B4 View Post
Here is the link for the tires http://www.mickeythompsontires.com/s...StreetRadialII

If your going to run 18's, check out ebay. Or if you want drag wheels, CCW makes some of the best, but they cost.
Sweet, so people running these tires don't need to change their shift points or any other kind of tuning, correct?
__________________
2009 Corvette A6, Victory Red, bone stock dyno: 373.8 rwhp / 364.5 lbs. torque
1987 Buick Grand National
Dyno run: http://www.youtube.com/watch?v=qghTd47KOgY&hd=1
SubSolar is offline   Reply With Quote
Old 11-09-2009, 03:09 AM   #9
LS1LT1
CF Senior Member
 
LS1LT1's Avatar
 
Member Since: Feb 2001
Location: Springfield, NJ Raceway Park & Atco Raceway
Send a message via AIM to LS1LT1
Default

Quote:
Originally Posted by Tony B4 View Post
Yes the Mikey Thomspon dr's 305/30/18's have a tire diameter of 26.4
Except that they're actually 305/35/18.




Quote:
Originally Posted by SubSolar View Post
Sweet, what width wheels do people use for those? Do people use front C6 replica wheels?
Yes, you can use some 18" C6 replica wheels for those tires, 18x10 or 18x10.5 would be best but the 18x9.5 (that's the size 'jpee' uses with that tire) could work as well.
LS1LT1 is offline   Reply With Quote
Old 11-09-2009, 04:25 AM   #10
SubSolar
CF Senior Member
 
SubSolar's Avatar
 
Member Since: Apr 2009
Location: Corona CA
Send a message via AIM to SubSolar
Default

Quote:
Originally Posted by LS1LT1 View Post
Except that they're actually 305/35/18.




Yes, you can use some 18" C6 replica wheels for those tires, 18x10 or 18x10.5 would be best but the 18x9.5 (that's the size 'jpee' uses with that tire) could work as well.
Cool, my only concern is that 305's may be *too* much traction for a stock converter and stock hp/torque? Like maybe it will bog too much and not allow enough spin?
__________________
2009 Corvette A6, Victory Red, bone stock dyno: 373.8 rwhp / 364.5 lbs. torque
1987 Buick Grand National
Dyno run: http://www.youtube.com/watch?v=qghTd47KOgY&hd=1
SubSolar is offline   Reply With Quote
Old 11-09-2009, 12:10 PM   #11
HOXXOH
CF Senior Member
 
HOXXOH's Avatar
 
Member Since: Sep 2007
Location: Peoria/Phoenix AZ
Default

It sounds to me that you've not yet been to the track. If you're bone stock, I'd suggest making a few passes to see if you really do need DR's. I ran 12.0's before the RF's weren't enough and had no issues at all when bone stock.
HOXXOH is offline   Reply With Quote
Old 11-09-2009, 12:26 PM   #12
SubSolar
CF Senior Member
 
SubSolar's Avatar
 
Member Since: Apr 2009
Location: Corona CA
Send a message via AIM to SubSolar
Default

Quote:
Originally Posted by HOXXOH View Post
It sounds to me that you've not yet been to the track. If you're bone stock, I'd suggest making a few passes to see if you really do need DR's. I ran 12.0's before the RF's weren't enough and had no issues at all when bone stock.
Actually I did and almost lost traction, which is why I want some stickier tires. You can read my post here:

http://forums.corvetteforum.com/c6-t...rip-today.html

After doing some searching on the forum, I found that other stock C6 owners also get squirrely on the 1-2 shift and they get drag radials just to solve this issue. Even if their 60 foot times don't improve.
__________________
2009 Corvette A6, Victory Red, bone stock dyno: 373.8 rwhp / 364.5 lbs. torque
1987 Buick Grand National
Dyno run: http://www.youtube.com/watch?v=qghTd47KOgY&hd=1
SubSolar is offline   Reply With Quote
Old 11-09-2009, 01:05 PM   #13
HOXXOH
CF Senior Member
 
HOXXOH's Avatar
 
Member Since: Sep 2007
Location: Peoria/Phoenix AZ
Default

Quote:
Originally Posted by SubSolar View Post
Actually I did and almost lost traction, which is why I want some stickier tires. You can read my post here:

http://forums.corvetteforum.com/c6-t...rip-today.html

After doing some searching on the forum, I found that other stock C6 owners also get squirrely on the 1-2 shift and they get drag radials just to solve this issue. Even if their 60 foot times don't improve.
OK, just read that and now recognize why you're researching DR's.

I do want you to know that same problem can exist with DR's, so it's not a guaranteed solution. With me it's finding the exact spot on the track where the earlier prep was dragged out a little more than where my shift point comes. I made 8 passes a week ago with MT DR's and had to back out of 4 because of excessive 2nd gear spin. This particular track only preps to about 200 feet on T&T days, so I nearly always spin at the shifts.

With only one pass under your belt, trying to make a decision what to do is difficult at best.
HOXXOH is offline   Reply With Quote
Old 11-09-2009, 06:07 PM   #14
SubSolar
CF Senior Member
 
SubSolar's Avatar
 
Member Since: Apr 2009
Location: Corona CA
Send a message via AIM to SubSolar
Default

Quote:
Originally Posted by HOXXOH View Post
OK, just read that and now recognize why you're researching DR's.

I do want you to know that same problem can exist with DR's, so it's not a guaranteed solution. With me it's finding the exact spot on the track where the earlier prep was dragged out a little more than where my shift point comes. I made 8 passes a week ago with MT DR's and had to back out of 4 because of excessive 2nd gear spin. This particular track only preps to about 200 feet on T&T days, so I nearly always spin at the shifts.

With only one pass under your belt, trying to make a decision what to do is difficult at best.
Is your car stock? Hmm, I thought drag radials would make it dead hook during the 1-2 shift. How on earth do these trailer queens I see get down the track with much more HP and gear?
__________________
2009 Corvette A6, Victory Red, bone stock dyno: 373.8 rwhp / 364.5 lbs. torque
1987 Buick Grand National
Dyno run: http://www.youtube.com/watch?v=qghTd47KOgY&hd=1
SubSolar is offline   Reply With Quote
Old 11-09-2009, 08:05 PM   #15
HOXXOH
CF Senior Member
 
HOXXOH's Avatar
 
Member Since: Sep 2007
Location: Peoria/Phoenix AZ
Default

Quote:
Originally Posted by SubSolar View Post
Is your car stock? Hmm, I thought drag radials would make it dead hook during the 1-2 shift. How on earth do these trailer queens I see get down the track with much more HP and gear?
Not stock any more, but when it was and even when slightly modded, I could still dead hook with the original non-Z51 RF's. My reason for using DR's is for more consistancy at the track that has poor prep. If I get out of the ideal track location I still spin on the 1-2 shift just like I would on the street with my Invo's.
HOXXOH is offline   Reply With Quote
Old 11-09-2009, 08:05 PM
 
Go Back   Corvette Forum > C6 Corvette, 2005 - 2013 > C6 Tech/Performance
Reload this Page Do I need to change shift points on 09 A6 if I run drag radials?
 
 
 
Reply

Similar Threads
Thread Thread Starter Forum Replies Last Post
Drag Radials for Base C6 Dave-T Drag Racing 3 10-23-2013 01:01 PM
Drag radial questions tommie Performance Results 25 09-13-2009 12:04 AM
Post your best 60fts on Drag Radials siffert C6 Tech/Performance 16 03-02-2008 01:19 AM
WTB: DRAG RADIAL MIKE-C5 C5 Parts for Sale/Wanted 1 02-26-2004 03:53 PM
Drag racing tire question lawman34203 Drag Racing 2 02-15-2003 05:27 PM


Tags
a6, c6, corvette, ls2, points, shift


Thread Tools Search this Thread
Search this Thread:

Click for Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Corvette Store
 
 
C7 Parts & Accessories
C6 Parts & Accessories
C5 Parts & Accessories
C4 Parts & Accessories
C3 Parts & Accessories
C2 Parts & Accessories
C1 Parts & Accessories
Wheels & Tires
Sponsored Ads
 
 
Vendor Directory
 

All times are GMT -4. The time now is 07:10 PM.


Emails & Password Backup