1/4 ET's going from 2.73 to 3.73
02-20-2004, 11:47 AM
#16
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Join Date: May 2001
Location: Reno, NV
Posts: 97
Originally posted by JustaLT1
Dude, I have a stock A4 transmission AND 3.73 gears and I've had my speedo recalibrated. Funny how someone else with an auto and 3.73s has said the same thing I have....yet no one has agreed with you. Perhaps if you actually HAD the setup that was being talked about...your argument might hold some water. But you're pointing to a calculator on the internet saying that you are right. This is the same calculator that says I should be doing 117 in 3rd gear at 5700 rpms. WRONG! Now go sit in the corner, dumbass.
Quote from the calculator's site:
Dude, I have a stock A4 transmission AND 3.73 gears and I've had my speedo recalibrated. Funny how someone else with an auto and 3.73s has said the same thing I have....yet no one has agreed with you. Perhaps if you actually HAD the setup that was being talked about...your argument might hold some water. But you're pointing to a calculator on the internet saying that you are right. This is the same calculator that says I should be doing 117 in 3rd gear at 5700 rpms. WRONG! Now go sit in the corner, dumbass.
Quote from the calculator's site:
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02-20-2004, 11:49 AM
#17
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Join Date: May 2001
Location: Reno, NV
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Originally posted by Hellion
I hear ya JustaLT1. This guy has an answer for everything. He doesn't even drive an f-body. Hey Steve Y, I think you need to spend more of your time over at the Corral.
I hear ya JustaLT1. This guy has an answer for everything. He doesn't even drive an f-body. Hey Steve Y, I think you need to spend more of your time over at the Corral.
Last edited by Steve Y; 02-20-2004 at 01:27 PM.
02-20-2004, 01:27 PM
#19
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Location: Goin down the track...
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Hey dip****, if you knew aboslutely ANYTHING about cars, you'd know that at 3730 RPMS in third gear (1:1 gear) you'd be going 70 MPH if you had 3.73's and a 245/50/16 tire. His calculator says you'd be going ~77 mph. That is just PLAIN WRONG! Just like it's wrong for a 3.23 gear. At 3230 rpms with a 3.23 gear. That calculator is WRONG on every single gear I put in it. And because you lack the wisdom to know any better, you try and pass it off as fact? You're a ****in idiot! Why don't you go do some research on something BEFORE you talk about something you are obviously ignorant about. I own 2 F-bodies and have made over a thousand track passes between them...not to mention they are both daily drivers. I think I'm a little better qualified to answer the question than you are with your 14 second Mustang.
So I guess if my I.Q. is 2....yours is what? About half of that? (which is 1, because obviously you can't do simple math). So, maybe if you try listening to the people who know better than you....you might actually learn something.
So I guess if my I.Q. is 2....yours is what? About half of that? (which is 1, because obviously you can't do simple math). So, maybe if you try listening to the people who know better than you....you might actually learn something.
02-20-2004, 01:30 PM
#20
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Location: Reno, NV
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Originally posted by JustaLT1
Hey dip****, if you knew aboslutely ANYTHING about cars, you'd know that at 3730 RPMS in third gear (1:1 gear) you'd be going 70 MPH if you had 3.73's and a 245/50/16 tire.
Hey dip****, if you knew aboslutely ANYTHING about cars, you'd know that at 3730 RPMS in third gear (1:1 gear) you'd be going 70 MPH if you had 3.73's and a 245/50/16 tire.
I have a stock '94 Z28 with 2.73s and an auto sitting 20' from me right now that I drive all the time. The calculator is right on for that thing. It is also right for a 3.23 geared auto Z28. My car is right on with the calculator as well. From there on it is a simple mathematical calculation.
I can't believe that I keep getting "pulled in" argueing with people that fell on their heads. Must be a fault of mine.
Last edited by Steve Y; 02-20-2004 at 01:47 PM.
02-20-2004, 02:00 PM
#21
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Join Date: Sep 2003
Location: Cape May Court House, NJ
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Like I said before; you got an answer for everything. Who said anything about 2.73's? Do yourself a favor, get rid of them and throw in a set of 3.73's. Real life experience is what counts. Not some DIY equation with a calculator on the 'net.
Last edited by DB75; 02-20-2004 at 02:02 PM.
02-20-2004, 02:05 PM
#22
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Location: Reno, NV
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Originally posted by Hellion
Like I said before; you got an answer for everything. Who said anything about 3.23's? Do yourself a favor, get rid of them and throw in a set of 3.73's. Real life experience is what counts. Not some DIY equation with a calculator on the 'net.
Like I said before; you got an answer for everything. Who said anything about 3.23's? Do yourself a favor, get rid of them and throw in a set of 3.73's. Real life experience is what counts. Not some DIY equation with a calculator on the 'net.
02-20-2004, 02:16 PM
#23
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Join Date: Apr 2002
Location: Goin down the track...
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Wow, good job. You got me. IF you don't calculate for ANY slippage. But you get slippage with an automatic. It would actually be 3419 rpms at 70 mph with 3.73's if you figure for no slippage. But slippage is usually about 10% on our cars. OBVIOUSLY you didn't know that.
Figure RPM = (mph x axle ratio x trans ratio x 336) / (tire diamter in inches)
So you get: (70 * 3.73 * 1 * 336) / (25.66) = 3419
Then to get your ACTUAL rpm figure 3419 * 1.1 = 3760 or thereabouts. The slippage varies, but when you actually DO the math....you'll see that I'm right....and you're WRONG....AGAIN. Thanks, now take your seat at the back of the classroom.
Now let's get back to the argument originally started:
(80 * 3.73 * .7 * 336) / (25.66) = 2735
Then 2735 * 1.1 = 3009
So, you see.....at 80 MPH in an A4 with 3.73 gears....you'll be doing 3000 rpms. Which is what my car does. Anything else you would like to add Steve Y? Because you've just been
Figure RPM = (mph x axle ratio x trans ratio x 336) / (tire diamter in inches)
So you get: (70 * 3.73 * 1 * 336) / (25.66) = 3419
Then to get your ACTUAL rpm figure 3419 * 1.1 = 3760 or thereabouts. The slippage varies, but when you actually DO the math....you'll see that I'm right....and you're WRONG....AGAIN. Thanks, now take your seat at the back of the classroom.
Now let's get back to the argument originally started:
(80 * 3.73 * .7 * 336) / (25.66) = 2735
Then 2735 * 1.1 = 3009
So, you see.....at 80 MPH in an A4 with 3.73 gears....you'll be doing 3000 rpms. Which is what my car does. Anything else you would like to add Steve Y? Because you've just been
02-20-2004, 05:33 PM
#24
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Join Date: May 2001
Location: Reno, NV
Posts: 97
Originally posted by JustaLT1
Wow, good job. You got me. IF you don't calculate for ANY slippage. But you get slippage with an automatic. It would actually be 3419 rpms at 70 mph with 3.73's if you figure for no slippage. But slippage is usually about 10% on our cars. OBVIOUSLY you didn't know that.
Figure RPM = (mph x axle ratio x trans ratio x 336) / (tire diamter in inches)
So you get: (70 * 3.73 * 1 * 336) / (25.66) = 3419
Then to get your ACTUAL rpm figure 3419 * 1.1 = 3760 or thereabouts. The slippage varies, but when you actually DO the math....you'll see that I'm right....and you're WRONG....AGAIN. Thanks, now take your seat at the back of the classroom.
Now let's get back to the argument originally started:
(80 * 3.73 * .7 * 336) / (25.66) = 2735
Then 2735 * 1.1 = 3009
So, you see.....at 80 MPH in an A4 with 3.73 gears....you'll be doing 3000 rpms. Which is what my car does. Anything else you would like to add Steve Y? Because you've just been
Wow, good job. You got me. IF you don't calculate for ANY slippage. But you get slippage with an automatic. It would actually be 3419 rpms at 70 mph with 3.73's if you figure for no slippage. But slippage is usually about 10% on our cars. OBVIOUSLY you didn't know that.
Figure RPM = (mph x axle ratio x trans ratio x 336) / (tire diamter in inches)
So you get: (70 * 3.73 * 1 * 336) / (25.66) = 3419
Then to get your ACTUAL rpm figure 3419 * 1.1 = 3760 or thereabouts. The slippage varies, but when you actually DO the math....you'll see that I'm right....and you're WRONG....AGAIN. Thanks, now take your seat at the back of the classroom.
Now let's get back to the argument originally started:
(80 * 3.73 * .7 * 336) / (25.66) = 2735
Then 2735 * 1.1 = 3009
So, you see.....at 80 MPH in an A4 with 3.73 gears....you'll be doing 3000 rpms. Which is what my car does. Anything else you would like to add Steve Y? Because you've just been
Last edited by Steve Y; 02-20-2004 at 05:36 PM.
02-20-2004, 05:46 PM
#25
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Join Date: Apr 2002
Location: Goin down the track...
Posts: 46
The lock-up is something I thought about after I posted. With lock-up, there shouldn't be any slippage...I think. But, at the same time....not every car has a lock-up convertor. My convertor is supposed to be a lock-up convertor, but maybe it isn't? But I do know that my car won't go 117 mph in 3rd gear at 5700 rpms which would be with the convertor unlocked. But my other car is an auto LS1 with 3.23's. All stock and it reads just over 3200 rpms at 70 in third. 
02-20-2004, 06:28 PM
#26
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Join Date: Feb 2001
Location: Mesa, Az
Posts: 622
Originally posted by JustaLT1
Hey dip****, if you knew aboslutely ANYTHING about cars, you'd know that at 3730 RPMS in third gear (1:1 gear) you'd be going 70 MPH if you had 3.73's and a 245/50/16 tire. His calculator says you'd be going ~77 mph. That is just PLAIN WRONG! Just like it's wrong for a 3.23 gear. At 3230 rpms with a 3.23 gear. That calculator is WRONG on every single gear I put in it. And because you lack the wisdom to know any better, you try and pass it off as fact? You're a ****in idiot! Why don't you go do some research on something BEFORE you talk about something you are obviously ignorant about. I own 2 F-bodies and have made over a thousand track passes between them...not to mention they are both daily drivers. I think I'm a little better qualified to answer the question than you are with your 14 second Mustang.
So I guess if my I.Q. is 2....yours is what? About half of that? (which is 1, because obviously you can't do simple math). So, maybe if you try listening to the people who know better than you....you might actually learn something.
Hey dip****, if you knew aboslutely ANYTHING about cars, you'd know that at 3730 RPMS in third gear (1:1 gear) you'd be going 70 MPH if you had 3.73's and a 245/50/16 tire. His calculator says you'd be going ~77 mph. That is just PLAIN WRONG! Just like it's wrong for a 3.23 gear. At 3230 rpms with a 3.23 gear. That calculator is WRONG on every single gear I put in it. And because you lack the wisdom to know any better, you try and pass it off as fact? You're a ****in idiot! Why don't you go do some research on something BEFORE you talk about something you are obviously ignorant about. I own 2 F-bodies and have made over a thousand track passes between them...not to mention they are both daily drivers. I think I'm a little better qualified to answer the question than you are with your 14 second Mustang.
So I guess if my I.Q. is 2....yours is what? About half of that? (which is 1, because obviously you can't do simple math). So, maybe if you try listening to the people who know better than you....you might actually learn something.
02-20-2004, 06:31 PM
#27
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Join Date: Apr 2002
Location: Goin down the track...
Posts: 46
Originally posted by Kreinmc
Assuming you have a stock sized tire, go out and drive 76mph in your third gear and post what your rpms are. I bet you they are at 3730 which is exactly what the calculator says they are at. I have used this calculator many times and it has always been right.
Assuming you have a stock sized tire, go out and drive 76mph in your third gear and post what your rpms are. I bet you they are at 3730 which is exactly what the calculator says they are at. I have used this calculator many times and it has always been right.
02-21-2004, 01:06 AM
#29
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Location: Goin down the track...
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Perhaps that is the case. I'm pretty sure my convertor is a lock-up....at least it's supposed to be. However, the numbers I gave you are what it reads. But maybe it's not a lock-up....or I guess it could be possible that my tach is off. And I can think of a number of possible explanations for my LS1 car reading how it does. It's still a bit puzzling.
02-22-2004, 04:50 PM
#30
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Join Date: May 2001
Location: Reno, NV
Posts: 97
Originally posted by JustaLT1
Perhaps that is the case. I'm pretty sure my convertor is a lock-up....at least it's supposed to be. However, the numbers I gave you are what it reads. But maybe it's not a lock-up....or I guess it could be possible that my tach is off. And I can think of a number of possible explanations for my LS1 car reading how it does. It's still a bit puzzling.
Perhaps that is the case. I'm pretty sure my convertor is a lock-up....at least it's supposed to be. However, the numbers I gave you are what it reads. But maybe it's not a lock-up....or I guess it could be possible that my tach is off. And I can think of a number of possible explanations for my LS1 car reading how it does. It's still a bit puzzling.
