So on street tires, I should stick with the 3.23's and look to a different mod? I have a 2.1 60' now....here just read this..lol

Thanks for the help

http://web.camaross.com/forums/showt...hreadid=245919

-Dustin-

 

Some of you guys appear slighty retarded. Its simple math, 2.75's would be faster at top end than 3.23's and so on. The lower the number, the less times the drive shaft has to turn for the tires to spin one full rotation.


Hense,

4.10 best for 0-60

2.75 best for 90+

Inbetween will give you the best of both worlds.

I have stock 3.23's and I can beat a 2002 Z off the line, but at about 50 it goes Roarin by.

 

Retarded Eh?

Do the math and you'll find out that you shouldn't throw stones in glass houses.

Download my spreadsheet that I have a link to above. You will see that after about 35-37 mph the 3.73's and the 4.10's both have less average acceleration than the 3.23's at WOT shifting at redline.

The biggest benefit to gears comes into play when you put a cam in and increase your redline. That way you can run out each gear further in mph, and take advantage of the gearing longer.

Dan

 

I have 3:42s and love them..Ive seen ~5300rpm in OD (~169+mph) and they seem to pull hard from any range. I would just get the gears that fit you best..and work on adding HP... the gains from gears are sometimes pointless if it bites into other areas...

For instance I like to play on the interstate more than at the track...so higher than 3:42s would be a waste for me.

 

I am so confused now..........i was to see some of these acusations done. I don't even know myself now.

3.73's will gain more in that 60' then 2.73's can gain back on the top to 140 i would guess.......now the 3.42's might be different.......might be an all around good gear....lol


I am having the same debate in my head all day.......to go 3.73's or 3.42's. I guess the only way to find out is to run them both in the same car

 

Yes, going by the numbers, the 3.73's should gain more in the 60' than they give up after about 35 mph. You are correct.

All in all, from a stop, gears are a good option as long as you can get traction to make use of that extra TQ.

Dan

 

You can't go by calculations to get your top speed by RPM's with autos, it doesn't take into account the convertor slippage. I did 5200-5300 in OD with 3.23's, and I know my car wont do 176+ mph.

 

Ok for all those of you calling people retards and saying a 3.42 car will outrun a 4.10 car on the highway in an M6 need to think before you start throwing insults like that.

Think about it, if you dont run out of gears (in an m6 you wont with a .50 6th) then you will almost always be at a higher rpm with lower gears 3.73+. Lets say you have an m6 with 4.10's on the back (2.66, 1.78, 1.30, 1.00, .74, .50) the top speed for each gear is going to be (40,60,83,108,145,215) and the gears top out in a 3.42 at (48,72,99,129,174,258).

Now lets say you wanted to race from 50 mph to 150, in a 3.42 you would start in 2nd gear at roughly 3900 rpm. In a 4.10 car you would be at 4700 rpm. The 4.10s would already have the advantage power wise and would go through the gears faster. Up to 150, a 4.10 car would go through 4 gears while a 3.42 would only go through 3.

Now my point in all this is with lower (higher numerically) gears you will have an advantage in acceleration regardless if it is highway or from a stop. The whole goal is to go through the gears and stay at the peak of your powerband as long as possible, thats the whole point of a close geared transmission.

And you get beat by a 2002 Z because they dont know how to drive and their engine makes up for it over 50 mph.

 

I was going out for a GPS run later on, but never got around to it. Just have to remember the GPS next time. hehe.. you cant figure converter slippage?? a lockup shouldnt have that much slippage.

 

There was quite the debate on this over in the "Track Kills" forum and it was proven that a 3:42 car will out accelerate from a 70+MPH roll a 4:10 car with all supporting mods being equal. Anyone else remember it?

 

This logic even holds true with auto's (to an extent) because the top speeds for 4.10's are (35,66,108,153), 3.42 (42,80,129,185), 2.73 (53,100,162,231).

Now correct me if im wrong, but wouldnt you rather go through 3 gears and nearly top them out all from 50-150, yea... that would be the fastest acceleration.

I do realize that there are downsides to doing this, but thats part of the reason that auto's suck. Sorry for those of you stuck with an auto.

 

Dont worry about offending if this trans blows (2K build up) im going to a T56

 

That isn't true.

First, your car accelerates according to your TQ curve, not your HP curve. A car at 3900 RPM has more acceleration than a car at 4700 RPM if they are in the same gear because the LT1 has more TQ at 3900 RPM.

Gears are a trade off. Yes, you have more TQ in every gear at every RPM with lower gears. The problem is that you run out of gear at an earlier SPEED in each gear, causing you to shift to the next gear which has less of a TQ multiplication. The only time that there is a clear advantage to lower gears is most of the way through 1st gear.

I also have an Excel spreadsheet that shows the TQ of the M6 with different rear gears if you would like to see it. It's quite obvious once you see the curves.

From a dead stop, lower gears are always better because you get a big advantage in 1st gear as long as you get traction. From a roll over 35 mph or so, the car with the higher gears will win, all other things being equal.

Dan

 

Ok, HORSEPOWER IS WHAT ACCELERATES A CAR!!!

Now that I got that out.

Torque is what determines HP, without it and you have nothing. HP=RPM*Torque/5252. If torque were what accelerated a car, wouldnt diesels be fast as SHlT ? Yea, but they arent. Why do formula 1 cars have 800 horsepower and only 250 lbs of torque? By your logic, my car would beat a F1 car in acceleration. The point I am trying to make is torque alone doesnt accelerate a car whatsoever. Horsepower ONLY accelerates a car. The whole goal is to maximize the horsepower wherever you can. If the whole goal was to make more torque, then why do people worry about top end?

I realize that a torque curve is VERY is important in determining how well an engine will run, but the old phrase that "horsepower sells cars, but torque wins races" is total BS if you ask me. AVERAGE hp (due to torque curve) is what wins races.

Back in the day with 3 speed auto's if you had a spikey torque curve, then shifts would kill you because you would drop out of the power band. But with 6 speeds, you CAN have a spikey torque curve and rev higher to stay in your powerband due to closer gears.

 

The convertors dont lock up under WOT.