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94302Stang · Feb 24, 2009

Why? dam is an auto tranny really that bad? I asked my mechanic the same question and he told me that auto is way better (for drag racing) cuz while the other guy is shifting, im already a little bit ahead. now i dont know if he is just messing with me or not.... But anyway how much would that be for switching to manual? im guessing like around $3,000?

Black Stampede · Feb 24, 2009

94302Stang said:
Why? dam is an auto tranny really that bad? I asked my mechanic the same question and he told me that auto is way better (for drag racing) cuz while the other guy is shifting, im already a little bit ahead. now i dont know if he is just messing with me or not.... But anyway how much would that be for switching to manual? im guessing like around $3,000?

Get a **** kit, stall, and 4.10s and the auto will be fine.

94302Stang · Feb 24, 2009

ok sorry for sounding like an idiot but a what kit? and u mean a stall converter right?

Black Stampede · Feb 24, 2009

94302Stang said:
ok sorry for sounding like an idiot but a what kit? and u mean a stall converter right?

A **** kit. They work really well when trying to liven up an auto.

Black Stampede · Feb 24, 2009

Haha, just messin with ya. Meant to write SHIFT kit hahaha. And yes, stall converter.

94302Stang · Feb 24, 2009

ok and what exactly do those two things do? I sort of know what a shift kit looks like but what will be the difference? how much do these go for and where can i find this?

final5-0 · Feb 24, 2009

94302Stang said:
Why? dam is an auto tranny really that bad? I asked my mechanic the same question and he told me that auto is way better (for drag racing) cuz while the other guy is shifting, im already a little bit ahead. now i dont know if he is just messing with me or not.... But anyway how much would that be for switching to manual? im guessing like around $3,000?

Briefly ... You loose power from the flywheel to the rear wheel

That fact is due to drive train loss

Ballpark or rule of thumb for a stick trans in a typical street car combo
is about 15% loss

Say you got 350 at the flywheel

350 X .85 = 298 at the rear wheel

Now ... the loss through an auto trans is a bit more

How much more is hard to say but a ballpark is 20% give or take a few

Grady

ratio411 · Feb 26, 2009

Yeah... What he said!

15% parasitic loss between engine and ground with a manual, 20% with a typical auto
tranny. There are ways to improve this, but if you use some tricks and lower your losses
to 18%, the same tricks will lower a manual to 13%... Aluminum driveshaft, for example,
makes a big difference.

Anyway, this whole scenario is a double edged sword.
Manuals put more power to the ground, but are harder to launch without wheelspin.
Autos are way more consistent. It's not that the other guy is spending time shifting,
it's the fact that he will never shift exactly the same EVERY time. Consistency wins
races and traction wins races. Manual tranny cars, being subject to human operation,
are at a disadvantage on both counts when running against an auto.

For pure fun, intimidation, and dyno bragging rights, the manual tranny is where it's at.

You will also notice that even though gears tend to make a car faster, lower gears will
register lower dyno numbers. I don't know why myself, but have seen it over and over.
Go from a stock low-3.00 gear to 4.10, no other changes, and you will lose dyno power.

94302Stang · Feb 28, 2009

Ok i signed up to this website to learn more about Stangs and so far i have learned a few new things i didn't know. So i want to know how the whole process of getting the 4.10's goes? what exactly happens? is that basically getting a new differential? please explain.

ratio411 · Feb 28, 2009

Think of gearing as a lever.
If you have a short lever, you cannot exert your strength as much on an object
as effiecently as if you have a long lever. Make sense? Try to move a 500 lb rock
with a short lever, and maybe you can't move it. Or if you do, maybe it is very
strenuous. Now get a longer lever and the 500 lb rock moves and feels as though
it is lighter because you have given your strength more mechanical advantage.

That is what gears are. Leverage.
Higher numbers are called "lower" gears.
Lower numbers are called "higher" gears.

Higher numbers should be thought of as a longer lever.
Lower numbers should be thought of as a short lever.

Lower gears (higher numbers/longer lever) give your engine a
mechanical advantage and make the same power level 'feel' stronger.

The problem with gears is that lower gears, while they have better grunt,
they operate at steady rpm with less effeciency than higher gears.
Higher gears will cruise more economically than lower gears. Without
thought to the weight of the car, powerband of the engine, and gearing
in the transmission, lower gearing can end up being a drag for driveability.

That is where the overdrive transmission shines. It allows the lower gearing,
but still doesn't murder economy on the road under steady cruise. Old timers
had to either have highway gears and less leverage, or more leverage, but
then have a 5000 rpm cruise out on the highway.

Make sense so far?

94302Stang · Mar 2, 2009

Yea pretty much. So in the long run what would be the best choice for my auto tranny? the 3.73's or the 4.10's? I'm not planning on switching tranny's either so...

Black Stampede · Mar 2, 2009

4.10s. But if you are questioning it there are probably around 400 threads addressing this exact same question. :search:

ratio411 · Mar 2, 2009

Yeah, the concensus seems to be 4.10s for auto tranny.
With the OD tranny, it should still drive out good on the highway.

Without OD, old school, we had 4.11 ratio gears (see my handle), and boy,
were those fun on the highway! In my Maverick, at 45 mph, Pete Jackson was
singing hard! Pretty sound to be sure, but it got old if you were going more than
10 miles on a highway. Red light to red light was a blast!

94302Stang · Mar 5, 2009

I spoke to my mechanic yesterday when i went to pick my car up from the shop and he was telling me that 4.10's would be horrible on the highway and said that 3.55's or 3.73's are better. Now maybe he forgot that my car is auto but i will talk to him again about that before i do them. And i am also thinking about rebuilding the whole engine pretty soon.

Black Stampede · Mar 5, 2009

94302Stang said:
I spoke to my mechanic yesterday when i went to pick my car up from the shop and he was telling me that 4.10's would be horrible on the highway and said that 3.55's or 3.73's are better. Now maybe he forgot that my car is auto but i will talk to him again about that before i do them. And i am also thinking about rebuilding the whole engine pretty soon.

*Sigh* I feel like its hardly worth arguing. Truth is your mechanic has no idea and thats that. It is a friggen sports car not an Edsel. Even with a stick 4.10s are not some highway nightmare. Talk to people who know and have experienced it first hand. As in guys on this board!

Pokageek · Mar 5, 2009

Black Stampede said:
*Sigh* I feel like its hardly worth arguing. Truth is your mechanic has no idea and thats that. It is a friggen sports car not an Edsel. Even with a stick 4.10s are not some highway nightmare. Talk to people who know and have experienced it first hand. As in guys on this board!

:Word: in an auto yes. I don't think ur mechanic has any idea like the guys on this board.

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