The plot thickens LOL!!!

Ford did everything possible to have the 'first car in automotive history with over 300 horsepower and gets over 30 miles per gallon'.

 

The 505HP Corvette Z06 can hit 30 on the highway =). The EPA rating is like 26 though.

 

I think that's an important note. Ford isn't touting the "possible" but rather what the EPA has certified. Some people will get over 31 MPG. Others less. Same goes for the 29 MPG in the 6 speed. Before the EPA changed the way they evaluate cars, I always got the bottom end of the ratings. I'm hoping now to get a little closer to the actual MPG from the EPA.

So with the 3.31 gears it will still be POSSIBLE to get 31 MPG. It's just not going to be EPA certified.

 

Guess I never really noticed how much taller the base V6 AT 17" tires are ...

215/65-17 = 28.004" (V6 AT std)
225/60-17= 27.630" (V6 MT std)
235/50-18 = 27.252" (std GT, V6 AT/MT opt)
245/45-19 = 27.681" (GT/CS & opt 19" GT non Brembo ??)
255/40-19 = 27.031" (V6 PP opt ... GT Brembo opt ??)

Not quite sure if I got the 19" options correct, but almost a 1" o/a dia. difference between all these different factory installed tires. Good thing they can easily electronically calibrate each car to the specific tire originally installed rather than having to mess with different speedo drive & driven gears !!

Doug

 

Exactly what I said!

 

The plot thickens more!

So the V6 PP is effectively geared real low due to the combination of the 3.31 rear and the small diameter tires, that helps explain some of the performance numbers on that combination.

 

I just wanted to thank everyone.
Called my dealer up and he is adding it to my order.
Main thing is I dont want the acceleration to feel slow and with the 3.31 it def. wont.

Now its the waiting game and I think mine wont be scheduled until end of April if not May since I didnt order it until the end of March

 

Congrats on your decision, a smile during a launch is priceless

 

I'm happy you are getting the 3.31 gears. The V-6 camaro's come with (i think) 3.25 gears. Look at the bright side.......When all the used rental V-6 Mustangs hit the dealer lots, you will be able to beat them because i'm sure they will all have the 2.73 gear ratio.

 

2LT Camaro MT has 4.480 1st gear and 3.27 FD ...
w/ either the std. 19" or RS pkg. 20" wheels it's off the line torque is within 1% of a 2011 Mustang V6 MT w/ 3.31 gears & 18" wheels or 20.5% more than one w/ 2.73's & 18's.

2LT Camaro AT has 4.070 1st gear and 3.27 FD ...
w/ either the std. 19" or RS pkg. 20" wheels it's off the line torque is 8% LESS than a 2011 V6 AT w/ 3.31 gears & 18" wheels or 11% more than one w/ 2.73's & 18's.

Also, all V6 AT Camaro's have an OPEN Differential (GM must have thought it did not need LSD), so I'd guess the 2.73 equipped AT Mustang may have a chance at beating it too since it DOES have LSD and weighs 300 lbs. less.

The IRS is not as good off the line and wastes more HP than a live axle so maybe even an 2011 V6 MT w/ 2.73's may have a chance at beating a Camaro V6 MT.

It will be interesing to say the least.

Doug

 

I'd still do them..it won't be that much shorter in 1st...not to mention how much sweeter 2-5th would be though. I remember the SVO Mustangs had 3.73's and the rpm limit on them was just under 7k rpm with only a 25.5" tire.

255/40/19 Tire (27")
3.31's at 7k rpm
1st 40 2nd 67 3rd 102 4th 137 5th 170 6th 243

3.73's at 7k rpm
1st 36 2nd 60 3rd 91 4th 122 5th 151 6th 216

Note you can still hit 60 in 2nd gear and you will be deep into 4th crossing the traps. The 3.73's are he way to go, in fact I think 0-60 will be in the 4's and mid to low 13's in the 1/4 mile on a good day with a good launch.

Dave

 

just get a Zephyr and you'll get 38 mpg! i love what they could get away with advertising..

 

Great post those numbers confuse a lot of people!

 

maybe this will help,if you have a 2.73 ratio that means that the driveshaft wll make 2.73 revs to every revolution the tire makes,if on the other hand you have a 3.3i gear ratio that means the the driveshaft will make 3.31 revs for every rev the tire makes therefore the tire wil turn slower at any given engine RPM in any given tranny gear with the 3.31 but will put more torque to the ground and the car will accelerate much faster, yea!

 

Nice and dead 7 year old Thread. Happy to report after buying the optional 3.31 gear ratio I have changed to 3.73 gears and very happy with them . A lot of us v6ers have changed to 3.73's