2003 GT stock rearend????

mogs01gt · Nov 11, 2016

Greg Barnett said:
Ok. Correction. 275/40/19

a 275/40/19 is a 27 inch tall tire and if you are at 2500rpm at 70mph, you sir have 4.30s gears. Its actually 70.3. Your tires are the wrong size for a Mustang. Are they drag radials?

A 35 series 19inch is 26.5" and a 30 series is 25.5". Stock is 25.68".

Mine for reference:
3.90 gears, 275/35/r18 is a 25 inch tall tire and at 2500rpm, Im at 71.7mph
stock: 3.27 gear 245/45/r17 is a 25 inch tall tire and at 2500 rpm, its at 85.9mph.

Axle calc for your use.
https://drive.google.com/open?id=0BxRmaQKbPZklMW54QXgwRmlzOUU

Greg Barnett · Nov 11, 2016

mogs01gt said:
a 275/40/19 is a 27 inch tall tire and if you are at 2500rpm at 70mph, you sir have 4.30s gears. Its actually 70.3. Your tires are the wrong size for a Mustang. Are they drag radials?

A 35 series 19inch is 26.5" and a 30 series is 25.5". Stock is 25.68".

Mine for reference:
3.90 gears, 275/35/r18 is a 25 inch tall tire and at 2500rpm, Im at 71.7mph
stock: 3.27 gear 245/45/r17 is a 25 inch tall tire and at 2500 rpm, its at 85.9mph.

Axle calc for your use.
https://drive.google.com/open?id=0BxRmaQKbPZklMW54QXgwRmlzOUU

The tires are big fir the car. They're Perelli P-Zero tires. I bought it this summer this way. Honestly shocked that the car has such an aggressive rear end. but numbers don't lie. Thanks for all the info

mogs01gt · Nov 12, 2016

Greg Barnett said:
The tires are big fir the car. They're Perelli P-Zero tires. I bought it this summer this way. Honestly shocked that the car has such an aggressive rear end. but numbers don't lie. Thanks for all the info

They may have used those big ass tires to reduce the gear ratio. Bigger the tire, the more it reduces your rear gear. Those tires come stock on BMW 7 series to give you an idea what how big of a car those come on.

These are your tires right?
http://www.tirerack.com/tires/tires...odel=P+Zero+Nero+All+Season&partnum=74WR90NAS

get rid of those quick!! They're 5lbs heavier than a properly sized tire!
http://www.tirerack.com/tires/tires...9P0XLOLD&vehicleSearch=false&fromCompare1=yes

10lbs of extra rotation mass kills performance!
http://www.w8ji.com/rotating_mass_acceleration.htm

Greg Barnett · Nov 15, 2016

mogs01gt said:
They may have used those big ass tires to reduce the gear ratio. Bigger the tire, the more it reduces your rear gear. Those tires come stock on BMW 7 series to give you an idea what how big of a car those come on.

These are your tires right?
http://www.tirerack.com/tires/tires...odel=P+Zero+Nero+All+Season&partnum=74WR90NAS

get rid of those quick!! They're 5lbs heavier than a properly sized tire!
http://www.tirerack.com/tires/tires...9P0XLOLD&vehicleSearch=false&fromCompare1=yes

10lbs of extra rotation mass kills performance!
http://www.w8ji.com/rotating_mass_acceleration.htm

Actually no. It's not the "Nero" tire. To change them I have to change all 4 tires and rims. I guess I just need to build more horsepower!! Lol

Greg Barnett · Nov 15, 2016

Greg Barnett said:
Actually no. It's not the "Nero" tire. To change them I have to change all 4 tires and rims. I guess I just need to build more horsepower!! Lol

This is the car.

mogs01gt · Nov 17, 2016

How the are those tires not rubbing?

Greg Barnett · Nov 17, 2016

mogs01gt said:
How the **** are those tires not rubbing?

Well..... When I turn sharp the fronts rub a little on the inside. Like I said before I bought it this way. And I do like the looks. Plus it would cost a lot to change it.

Greg Barnett · Nov 17, 2016

What's your opinion on aftermarket sparkplug coil packs?? I've read a lot of reviews and they all seem to have a pretty good failure rate. Are they really that much better than stock or not worth the investment??
Thanks

trinity_gt · Nov 17, 2016

Not worth it.

mogs01gt · Nov 18, 2016

Greg Barnett said:
What's your opinion on aftermarket sparkplug coil packs?? I've read a lot of reviews and they all seem to have a pretty good failure rate. Are they really that much better than stock or not worth the investment??
Thanks

Only worth it once you get into the 600+hp range.

Neuron · Nov 19, 2016

Nice, how does it do on driveways and speed bumps.

Greg Barnett · Nov 19, 2016

Neuron said:
Nice, how does it do on driveways and speed bumps.

Thanks. I really don't have a problem with it dragging. Only a parking block I bumped in to the day I bought it. Oops.

2003 GT stock rearend????

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