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Corvette Fever mag has some info I want to pass along, hope it's not old news, but here goes:
Start of Production: 03/08/08
08-09 Model year 6.2 liter LS9 rated at 650HP and 650lb-ft torque.
available with six speed MTX transmission, the gearset being:
1st 2.29
2nd 1.63
3rd 1.21
4th 1.00
5th 0.81
6th 0.67
Reverse 3.15
Final 3.42
Specs show car with P335/25r20 tires at all four corners.The braking system will be a next generation braking system and engine intervention traction control system that is purpoted to make the current set up look antiqued at best. The designation on all documents is "SS" at this point and the hood scoop that is on the test mule Z is not indicative of what we'll see on production versions.
Hope this is good info for SS watchers.
holy tall first gear batman I'm not sure where it will redline, but that's going to be alot speed in 1st gear
that thing is going to lay some massive tq, so i guess thats about the only thing they can do to make it somewhat streetable (w/o using et streets of course)
Corvette Fever mag has some info I want to pass along, hope it's not old news, but here goes:
Start of Production: 03/08/08
08-09 Model year 6.2 liter LS9 rated at 650HP and 650lb-ft torque.
available with six speed MTX transmission, the gearset being:
1st 2.29
2nd 1.63
3rd 1.21
4th 1.00
5th 0.81
6th 0.67
Reverse 3.15
Final 3.42
Specs show car with P335/25r20 tires at all four corners.The braking system will be a next generation braking system and engine intervention traction control system that is purpoted to make the current set up look antiqued at best. The designation on all documents is "SS" at this point and the hood scoop that is on the test mule Z is not indicative of what we'll see on production versions.
Hope this is good info for SS watchers.
that gear ratio is close to the old GM Motorsports box
2.29
1.61
1.27
1
0.85
0.75
20" wheels tires are a waist as those will reduce the power significantly. Should be 18" all around.
The car might need 20s to fit the massive braking system! I agree thats 17s are better, but this car can only be so fast... should make 600whp easy with tuning and a pully.
Originally Posted by AU N EGL
that gear ratio is close to the old GM Motorsports box
2.29
1.61
1.27
1
0.85
0.75
20" wheels tires are a waist as those will reduce the power significantly. Should be 18" all around.
The writer of the piece stated that it was unlikely that the 20's would be used all around, but did note that all the testing is being done with 20's, so it could be.
20" wheels tires are a waist as those will reduce the power significantly. Should be 18" all around.
Not only do but also can state with some certainty that they will NEVER release that car for production with 335s on the front regardless of wheel diameter.
20" wheels tires are a waist as those will reduce the power significantly. Should be 18" all around.
The following are some rear wheel/tire overall diameters:
2008 SS 20": 26.6"
2007 Z06 19": 26.7"
2007 Z51 19": 26.9"
2007 base 19": 26.9"
2004 Z06 18": 26.1"
2004 Base 18": 26.7"
I think we can safely say that not only will power not be significantly reduced, it won't be reduced at all. Don't worry, it's not going to have the ghetto 20"s on it, they will be real honest to God performance tires.
holy tall first gear batman I'm not sure where it will redline, but that's going to be alot speed in 1st gear
that thing is going to lay some massive tq, so i guess thats about the only thing they can do to make it somewhat streetable (w/o using et streets of course)
The tall first gear is actually done to increase the input torque rating of the transmission...the current M6 in the Z06 is not rated for 650 LB-FT. With a given input shaft/countershaft spacing in a manual transmission, the only way to increase torque capacity is to use a taller 1st gear. The GM Motorsports gearbox has the tall 1st gear to accomodate the massive torque from the 427 race engines they use. This is also why the shorter 1st gear in the current Z51 and the C5 Z06 was not used in the current Z06, torque capacity with the 2.97 1st gear is not sufficient for the LS7.
As 1st gear increases numerically, the number of teeth on the input shaft gear decreases leaving less teeth in engagment at any time. With less gear teeth in engagment, stresses increase at the geartooth interface reducing torque capacity. Pretty simple actually. I imagine the first mod people will do is changing the rear gears...if they can get it to hook up and not break parts. The road race guys using the GM Motorsports gearbox change the rear gear to accomodate the track depending on whether it's a really, really fast track or just a fast track.
The following are some rear wheel/tire overall diameters: 2008 SS 20": 26.6"
2007 Z06 19": 26.7"
2007 Z51 19": 26.9"
2007 base 19": 26.9"
2004 Z06 18": 26.1"
2004 Base 18": 26.7"
I think we can safely say that not only will power not be significantly reduced, it won't be reduced at all.
And does this also factor in the potential extra power reducing weight of a 20" rim?
Of course a little less tire sidewall could also mean a lighter tire all else being equal so it could all be insignificant I guess.
The following are some rear wheel/tire overall diameters:
2008 SS 20": 26.6"
2007 Z06 19": 26.7"
2007 Z51 19": 26.9"
2007 base 19": 26.9"
2004 Z06 18": 26.1"
2004 Base 18": 26.7"
I think we can safely say that not only will power not be significantly reduced, it won't be reduced at all. Don't worry, it's not going to have the ghetto 20"s on it, they will be real honest to God performance tires.
YES it will when the significant amount the the wt is moved farther away from the center of rotation. It has nothing to do with the overall diameter of the wheel tire combo, but were that rotational wt is located in relation to the axle. With each inch larger diamter that rim is moved away from the center of rotation power is lost.
Let me look for that wheel formula on wt, size and result of engery used to rotate that wheel.
Something about the wt of the wheel and the radius of the wheel, minus the wt of the tire and the radiaus of the tire minus the radius of the wheel.
Last edited by AU N EGL; Mar 31, 2007 at 07:41 PM.