need help with cobras top end

CamarosCryCobra · 03-04-2008

hey guys..... i have a 1997 svt cobra, prodominatly stock. but im noticing a dead spot from about 90-105 it makes my top end seem really horrible.... any suggestion on what mods to get to cure this problem? thanks

heavy metal · 03-05-2008

i suggest a cai and a free flowing exhaust to start with....

dollarbill · 03-05-2008

Change out the gears (3.27s) in that rear end. With a high winding DOHC you need at the very least 3.73s, but 4.10s are preferred. You won't even notice the dead spot with more mechanical advantage.

CamarosCryCobra · 03-05-2008

yeah im doing the rear end gears next but i was told not to go over 3.73 because of the hey speed runs... that 4.10s are not good when going fast like on the highway... so i had my mined set on 3.73s

gandara · 03-06-2008

Quote:

Originally Posted by CamarosCryCobra

yeah im doing the rear end gears next but i was told not to go over 3.73 because of the hey speed runs... that 4.10s are not good when going fast like on the highway... so i had my mined set on 3.73s

3.73 is what I have, that should suffice.

dollarbill · 03-06-2008

How fast are you trying to go? What is your redline on those Cobras? Isn't it about 6800 rpm? Use this calculator... The T-45 has a .67 5th gear ratio. Input 4.10s and the stock size tires 245/45/17. Your speed in 5th gear at 6k rpm is 167 mph, thats with 4.10s! Plat around with this some... Ford Mustang: Mustang Tech: Calculators & Decoders: RPM Calculator

97 svt cobra · 03-06-2008

get some headers and exhaust and it will fix your dead spot. 4.10s will be fine(80mph@2800rpm) but 3.73s are also great and better if you do alot of highway driving