Any legitimate 4.11 final drive experiences?
Apr 7, 2010, 10:02 PM
#16
Josh a 4.56 FD will have more acceleration than a 4.11 traction being equal.
Shifting into 5th will kill ET's due to the fact that the car does actually decrease it's velocity during a shift due to drag @ 120+mph. So if you're going for ET you need to find the FD/gear/tire combination that will put you in the traps at the END of a gear (not the beginning)
You need to plot your acceleration with respect to engine speed/vehicle speed and account for drag. I have such an excel file I'll share with you Josh. It will plot out your shift points for given gear ratio's, FD's, and tire sizes.
PM me with your email.
Shifting into 5th will kill ET's due to the fact that the car does actually decrease it's velocity during a shift due to drag @ 120+mph. So if you're going for ET you need to find the FD/gear/tire combination that will put you in the traps at the END of a gear (not the beginning)
You need to plot your acceleration with respect to engine speed/vehicle speed and account for drag. I have such an excel file I'll share with you Josh. It will plot out your shift points for given gear ratio's, FD's, and tire sizes.
PM me with your email.second paragraph is not. The 4.56 will out accelerate a 4.11 in all gears. So car with 4.56 will put ~ 20 feet on the 4.11 car (1st-4th) when it has to give up 5 feet shifting to 5th.
Apr 8, 2010, 09:18 AM
#18
READ it again. You'll see that I don't recommend shifting into 5th... I simply stated that the 4.56 will accelerate better
I didn't say it would ET better...in fact I said it would ET worse. Reading comprehension! I believe it's tested in elementary school...
Apr 8, 2010, 11:16 AM
#19
I simply stated that the 4.56 will accelerate better I didn't say it would ET better
so why dont you explain to us how a car can accelerate harder but not ET better? lets use the following as an example.
you have two cars with identical 450hp setups. only difference between the two cars was the FD. 4.56 in one and 4.11 in the other. both cars get identcal tracion on the line. which will ET better? which will trap higher? please use 4th grade lingo so us with reading challenges can understand.
so why dont you explain to us how a car can accelerate harder but not ET better? lets use the following as an example.
you have two cars with identical 450hp setups. only difference between the two cars was the FD. 4.56 in one and 4.11 in the other. both cars get identcal tracion on the line. which will ET better? which will trap higher? please use 4th grade lingo so us with reading challenges can understand.
Apr 8, 2010, 02:39 PM
#21
I would think that the 485 gear would help out a bad driver or a car that hooks way to much and bogs 1.9 sixties. I have 26 inch tall tires and i come across at 7100 at 125. You got me thinking that the 485 would help me out of the hole and down the track regardless if i shifted into 5th.
Apr 8, 2010, 04:08 PM
#22
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I simply stated that the 4.56 will accelerate better I didn't say it would ET better
so why dont you explain to us how a car can accelerate harder but not ET better? lets use the following as an example.
you have two cars with identical 450hp setups. only difference between the two cars was the FD. 4.56 in one and 4.11 in the other. both cars get identcal tracion on the line. which will ET better? which will trap higher? please use 4th grade lingo so us with reading challenges can understand.
so why dont you explain to us how a car can accelerate harder but not ET better? lets use the following as an example.
you have two cars with identical 450hp setups. only difference between the two cars was the FD. 4.56 in one and 4.11 in the other. both cars get identcal tracion on the line. which will ET better? which will trap higher? please use 4th grade lingo so us with reading challenges can understand.
Apr 8, 2010, 06:27 PM
#23
Jerry its torque at the wheel.
Car A has 500 ft lbs at the crank and a 4.56 gear ratio. Assuming it has perfect traction it means we have 2280 ft lbs of tractive force or thrust. If car B had 4.11s it would have 2055 of thrust. When we dyno we measure torque at the wheel but it is not the same thing as what I am talking about. The dyno shows torque at the crank after drivetrain loss unless you have the dyno report total torque value.
4th grade-
Kid A- my car is faster up to 130 but doesnt go faster than that.
Kid B- My car is better cause I do a ricer flyby on my way to 150 even though you beat me to 130.
Car A has 500 ft lbs at the crank and a 4.56 gear ratio. Assuming it has perfect traction it means we have 2280 ft lbs of tractive force or thrust. If car B had 4.11s it would have 2055 of thrust. When we dyno we measure torque at the wheel but it is not the same thing as what I am talking about. The dyno shows torque at the crank after drivetrain loss unless you have the dyno report total torque value.
4th grade-
Kid A- my car is faster up to 130 but doesnt go faster than that.
Kid B- My car is better cause I do a ricer flyby on my way to 150 even though you beat me to 130.
Apr 8, 2010, 09:02 PM
#25
I had the issue of having to shift into 5th gear. My power level is below. Just rebuilt the trans and installed a 4:11 gear. I remember reading a graph that outlined max speed/rpm on here. Torque is not an issue for me at all. 
Last edited by antonio010; Apr 8, 2010 at 09:04 PM.
Apr 9, 2010, 07:14 AM
#26
I dont need to be in this thread. I had these answers 25 years ago when i first started playing with turbo cars. WAAAAy back then I did transmission changes with exact same power. results, 4.11 kicked butt on 3.88. only disadvantages are top speed suffers, as well as gas mileage. I haven't done it on an evo because I already know from past results i dont want to go there. I thought i gave some practical examples from my experiences but obviously from the sarcasms and dumb counterproductive posts theres seems to be no point in my trying to share my experiences.
