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-   -   reaching 120 mph slower? with 4:10 (http://mustangforums.com/forum/2005-2014-mustangs/698155-reaching-120-mph-slower-with-4-10-a.html)

mustang_gt808 07-15-2013 03:51 AM

reaching 120 mph slower? with 4:10
 
ok guys before i installed my 4:10s from 0-120 it seemed faster with my 3;55 gears? yesterday i opened it up from 0-120mph now with my 4:10 gears and it seamed when im passing 90 or 100mph it been slower reaching 120? i might be wrong but can anyone confirm this please. thanks guys

YoungBlood 07-15-2013 04:01 AM

you might have to shift sooner out of third, which might be slowing you down slightly?

cariacou 07-15-2013 05:18 AM

Quote:

Originally Posted by mustang_gt808 (Post 8248170)
ok guys before i installed my 4:10s from 0-120 it seemed faster with my 3;55 gears? yesterday i opened it up from 0-120mph now with my 4:10 gears and it seamed when im passing 90 or 100mph it been slower reaching 120? i might be wrong but can anyone confirm this please. thanks guys

yep.

ratio 3.55/4.10 = 115%

from 60>120+ your engine is working just as much as it used to with 3.55s when doing 60*1.15>120*1.15 = 70>140.

Nuke 07-15-2013 07:01 AM

Auto or manual?

Soldier GT 07-15-2013 08:41 AM

Just like any other mod it's going to take you a bit to get use to (especially gears). I had a buddy that ran a 08 GT full bolt ons and ran a consistent low 13's. He put a supercharger on it and 1st time at the track he ran a 13.6. Once you get use to the new gears and get the shifting down correct you'll be pulling alot harder than with the 3.55's....

Ricardo 07-15-2013 12:06 PM

Most guys I know who are serious about the 1/4th track run 4.10 and above...pretty sure there's a reason for that.

808muscle 07-15-2013 12:48 PM

Quote:

Originally Posted by Ricardo (Post 8248260)
Most guys I know who are serious about the 1/4th track run 4.10 and above...pretty sure there's a reason for that.

Yes....4.10's will get you in your power band quicker in a short quarter mile race. Many cars do 4.30, 4.45 and 4.88 but if you were doing a mile race 3.31 would be better suited for that.

MustangFirstCar 07-15-2013 03:57 PM

Well you do lose a little top end from a steeper gear ratio but you shouldn't be noticeably slower. Maybe you're just not used to the new gears yet.

adidasUNT8 07-15-2013 04:55 PM

your acceleration should not be slower. You are either losing traction and spinning or your driving skills have not adapted yet.

tremman78 07-16-2013 03:42 AM

youll get used to the new driving and love the 4:10's


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