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Old 09-01-2005, 03:32 PM   #1
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4.06 explanation

Everyone says "if you are going FI, don't get the 4.06's", are they that much shorter that rowing the boat comes too quickly for most folks?

Thanks in advance.


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Old 09-01-2005, 03:57 PM   #2
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well, as with most cars, when you increase the HP level and start changing gear ratio's, you can go too far. This is very evident in mustangs especially. If you go past the point where youre doing more shifting than useing the power you have, you will actually be slower in a sprint. If you move up in power, you will make better use of your power with the stock gear in a mtx75 trans. Its more of a balancing act. It depends alot with the amount of power you have as to weather or not you want to go to that gear. I know that sounds kinda crazy, but ive built alot of cars over the years and can tell you first hand that this is the case. I can give you example after example of kids around here getting me to put gears in their cars against my advice and going to the strip and running slower times. All they knew was that they wanted like a 4.10:1 gear and i tell them that they would be happier with a 3.73:1 and found out the hard, (and expensive), way that they should have listened. Hope this helps ya.
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Old 09-01-2005, 05:05 PM   #3
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Thats about what I figured but I just wanted to verify my thinking, thanks!
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Old 09-01-2005, 05:12 PM   #4
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Why the question goat??? Thinking of going FI
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Old 09-01-2005, 05:33 PM   #5
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when i was doing my build i was going with 4.06's on top of a 75 shot... well i was out in dillsburg pa with mcnews almost every weekend and this convo would always come up. while racing with nitrous many prefer 3.82's over the 4.06's...i've driven both first hand and i would take the 3.82's any day on a nicely modded focus.
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Old 09-01-2005, 06:37 PM   #6
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Quote:
Originally posted by mlowery
Why the question goat??? Thinking of going FI
No no, just looking forward to the winter project with the direct-port NOS.
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Old 09-01-2005, 09:51 PM   #7
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4.06 are perfect, thats what my dad ran in his old road runner, he said he could get from my house to my neighbors house in first gear, but thats alright, cuz that b was fast...my next modification is 4.06 and quafie
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Old 09-01-2005, 10:05 PM   #8
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oh.......well, i can dream that you would go FI
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Old 09-01-2005, 10:36 PM   #9
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I run 3.55 in my mustang, and while NA they were a little too tall. Once I installed the supercharger they were almost perfect ( added torque)
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Old 09-02-2005, 02:34 PM   #10
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you shouldn't look at gears as cut and dry, like everyone is saying.
if you are pushing serious torque then upping to a 4.06 is probably not a good idea.
if you have a ton of hp but marginal torque then you will probably gain from the shorter gear of a 4.06.
people like to wash over and make blanket statements because they simply do not know, or heard it from someone else.
4.06s are great in a supercharged applications where you do not make assloads of torque like you do with a turbo. with most superchargers the power is linear so the shorter gear will not light up the tires like it would with the big mid-range torque rush from a turbo setup.


gearing should be considered depending on the type of driving you do.
short gears are almost always better in AutoX and track events but can, like stated before, slow you down at the strip.

once again, like stated before, it's a balancing act.

but people who talk never really do anything, you will never know for sure unless you try it out. you might be surprized at how many people who claim one thing are totally wrong because they are using different cars to justify the point they are trying to make or not comparing apples to apples.

am i saying that the above posters are wrong, no. for the examples they site, they are correct.
i'm just saying there is far more to choosing the right gearing than some people would lead you to believe. it's not cut and dry, it's a big grey area and what works for one person might not work for another or vice-versa.
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