17" all around?
Thread Starter
Pro
Joined: May 2004
Posts: 531
Likes: 46
From: Tucson, AZ
17" all around?
Hey all,
I have the stock tires and rims all around, but recently purchased a set of 17" wheels with nitto DR's for use at the track....Is it ok to drive the car with the same diameter 17" wheels and tires on all 4 corners, or will this mess with the active handling as some people claim?
I have the stock tires and rims all around, but recently purchased a set of 17" wheels with nitto DR's for use at the track....Is it ok to drive the car with the same diameter 17" wheels and tires on all 4 corners, or will this mess with the active handling as some people claim?
Le Mans Master
Joined: Mar 2005
Posts: 7,876
Likes: 0
From: Ghent
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
IMHO, don't think they'd look that hot. Post some pics of them next to the car and maybe you'll get some more feedback. As for them causing problems, I know that people go with larger sizes so I don't see why smaller would hurt, but I could be wrong.
Last edited by MDriveMode; Jun 7, 2005 at 09:05 PM.
Burning Brakes
Joined: Jan 2005
Posts: 1,066
Likes: 2
From: fort worth texas
hi,
if im feeling lazy after a track event, i'll leave mine on. no issues. other than the pesky DIC message about tire pressure sensors. i dont have sensors with my et street radials (track tires). just have to clear/reset it once the car starts..then normal after that...17's all around.
if im feeling lazy after a track event, i'll leave mine on. no issues. other than the pesky DIC message about tire pressure sensors. i dont have sensors with my et street radials (track tires). just have to clear/reset it once the car starts..then normal after that...17's all around.
Burning Brakes
Joined: Nov 2004
Posts: 1,028
Likes: 0
From: Fort Worth Texas
My understanding from reading a lot of the "lowering" posts and other tire posts is that active handling must have a front to back offset of about 1" to be "happy". You could do that with 17's by altering the tire diameter from front to back.
Melting Slicks
Joined: Nov 2004
Posts: 2,275
Likes: 5
From: Lake Oswego, Near Portland Oregon
Most of the T-1 and SCCA racers use 17s all around. Active handling, I have been told, is mostly about electronic adjustment of your shock stiffness. Don't worry about it. Or, dump the heavy and 'expensive to replace' electric shocks [ pun intended] and buy a set of Bilstein Sports. ...reliable and always working. I REALLY like mine.
I am now running 17 and 18, but same 9.5 inch wide front and back, for wider front tires to help reduce inherant understeer in stock tire sizes..... wheels by Speedline of Italy.
I am now running 17 and 18, but same 9.5 inch wide front and back, for wider front tires to help reduce inherant understeer in stock tire sizes..... wheels by Speedline of Italy.
Burning Brakes
Joined: Nov 2004
Posts: 1,028
Likes: 0
From: Fort Worth Texas
Originally Posted by FiberglassFan
Most of the T-1 and SCCA racers use 17s all around. Active handling, I have been told, is mostly about electronic adjustment of your shock stiffness. Don't worry about it. Or, dump the heavy and 'expensive to replace' electric shocks [ pun intended] and buy a set of Bilstein Sports. ...reliable and always working. I REALLY like mine.
I am now running 17 and 18, but same 9.5 inch wide front and back, for wider front tires to help reduce inherant understeer in stock tire sizes..... wheels by Speedline of Italy.
I am now running 17 and 18, but same 9.5 inch wide front and back, for wider front tires to help reduce inherant understeer in stock tire sizes..... wheels by Speedline of Italy.
The Active Handling controller takes data on wheel speeds, steering angle and rate, yaw rate, lateral acceleration and brake pressure. If it detects a significant understeer situation, it will momentarily apply or, if the driver is already on the brakes, increase pressure to the inside rear brake. That applies additional yaw torque to the car in the direction it is turning which decreases the understeer. If the controller detects an excessive oversteer situation, Active Handling applies the outside front brake. This time, the yaw torque is opposite the turning direction and decreases oversteer.
The system is calibrated for the 1" difference in diameter between the front and back wheels, which is why it can cause issues when running the same tire diameters. I would venture to say that those folks running 17's all around still have staggered tire diameters.
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Thread Starter
Pro
Joined: May 2004
Posts: 531
Likes: 46
From: Tucson, AZ
Thanks for all the information guys, it really is a wealth of knowledge here...The reason I ask is that I am planning on running the stock front tires with a set of 275/40R17 Nitto DR's on the rears whenever I go to the track (also includes the trip to and from the track)...Do I have to turn active handling off whenever running this combination since they are pretty much the exact same diameter tire?
Le Mans Master
Joined: Oct 2001
Posts: 7,230
Likes: 0
From: Land of Sky Blue Waters
The active handling issues aside and from a purely aesthetic perspective, you're going to have trouble filling your wheel well to the same degree it's filled on the front. Just keep that in mind. I know - I've been there.
