difference between 3.55 and 4.10 gears - Mustang Evolution

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Old 07-16-2013, 10:15 PM   #1
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difference between 3.55 and 4.10 gears

Looking for people with experience with 4.10 gears. What does it feel like when steppig on the throttle? How short are 1st and 2nd gear? Is 4.10s too steep for a turbo? What would be the problems with having 4.10s with a turbo if any? Does the size of turbo make any difference? (67 mm or 73mm)? Any imput is appreciated guys!
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Old 07-16-2013, 10:18 PM   #2
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Id go 3.55 or 3.73 if you're doing f/i otherwise you'll pretty much have no 1st or 2nd
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Old 07-16-2013, 10:23 PM   #3
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Yes, properly selecting/sizing your turbo is probably THE most important step of turbocharging your car. It isn't just the turbine size either, there are different housing sizes and not all kits are created equal. As for what gears, that all depends on your driving habits and where your power comes on. If your setup doesn't get into the powerband until later on you'll want steeper gears, if you've got a setup that starts really building at like 2800rpm or so you might want to go lower. Its all in the combo.
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Old 07-16-2013, 10:31 PM   #4
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Quote:
Originally Posted by scottydsntknow View Post
Yes, properly selecting/sizing your turbo is probably THE most important step of turbocharging your car. It isn't just the turbine size either, there are different housing sizes and not all kits are created equal. As for what gears, that all depends on your driving habits and where your power comes on. If your setup doesn't get into the powerband until later on you'll want steeper gears, if you've got a setup that starts really building at like 2800rpm or so you might want to go lower. Its all in the combo.
So if I got a smaller turbo (65/67 mm) that spools at 2, 500 est. RPM with max boost at 4, 850 RPM then I should stick with 3.55 where as a bigger turbo (70mm - 76mm) that spools at an est. 3, 100 RPM with full boost at 5, 100 RPM then I should go 3.73/4.10? Would 3.73 be a big improvement over 3.55?
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Old 07-16-2013, 10:36 PM   #5
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Again, there's more to it than just the size of the turbo and you're going to hate life if you are making full boost at 4800... I'd go over to the turbo forums and do some reading of the stickies they have up there, LOTS of good info.
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Old 07-16-2013, 10:42 PM   #6
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Originally Posted by scottydsntknow View Post
Again, there's more to it than just the size of the turbo and you're going to hate life if you are making full boost at 4800... I'd go over to the turbo forums and do some reading of the stickies they have up there, LOTS of good info.
+1 try to get a quality ball bearing turbo
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