How much ET change does gears make?
Mish-ogynist
Joined: Nov 2007
Posts: 3,784
From: Helena, MT
RE: How much ET change does gears make?
I've asked the question before... Why do people recommend 3.73s for autos and 4.10s for manuals? I don't think anyone ever gave me a good reason.. or.. maybe I forgot to read the thread again 
I'm running 3.31 and I would expect the 3.73s to be pretty different.. but if 4.10s would be quite a bit faster than why not just go for those? or is it a MPG issue? I'd also like to know the city/highway change for each...
I'm running 3.31 and I would expect the 3.73s to be pretty different.. but if 4.10s would be quite a bit faster than why not just go for those? or is it a MPG issue? I'd also like to know the city/highway change for each...
4th Gear Member
Joined: Nov 2007
Posts: 1,699
From:
RE: How much ET change does gears make?
^^^Bingo!
And I would be surprised if he picks up 2 tenths with just 3.73's. The S197 is it's own animal and cannot be compared to anything other then other S197's when it comes to hooking the car...
If you haven't done anything else to your rear, what is going to happen is you are going to bite LESS with the 3.73's and my bet is you may actually lose a tenth.
If you want to really capitolize on the taller gear, you need to also upgrade your control arms, a panhard bar, and make sure you are using some good rubber. The taller gears are going to hit harder when you take off and make traction more difficult (not better or easier) with your stock set-up. Having said that - it is also a fact that there is not much gain going from the 3.33's to the 3.73's on a manual. You don't buy gears because people say they are good on a forum or because a certain ratio 'sounds about right'. You buy gears based on your MPH...period.
You establish what is going to be your max MPH in the 1/4 and you go with the tallest gear you can to not run out. That is drag 101 but for everyday street cars - yes, it's a little different and the 3.73's are going to be more 'fun' for you on the street but don't expect quicker ET's out of them unless you upgrade some other stuff to compliment them...
Despite what some people say, it is going to be HARDER to hook as go up in gears. This goes right along with what the vast majority of guys do...
make power 1st and worry about hooking later. This is why there are so many high HP cars out there but few 'fast' cars.
Hooking is #1 - power is second - that is the recipe for low et's... (that and forget HP and worry about TORQUE...LOL)
EDIT - I saw you have BFG's in your sig. Might gain a 10th with the 3.73's but still think you will need CA's and a panhard bar to see 2-3 tenths out of them.
And I would be surprised if he picks up 2 tenths with just 3.73's. The S197 is it's own animal and cannot be compared to anything other then other S197's when it comes to hooking the car...
If you haven't done anything else to your rear, what is going to happen is you are going to bite LESS with the 3.73's and my bet is you may actually lose a tenth.
If you want to really capitolize on the taller gear, you need to also upgrade your control arms, a panhard bar, and make sure you are using some good rubber. The taller gears are going to hit harder when you take off and make traction more difficult (not better or easier) with your stock set-up. Having said that - it is also a fact that there is not much gain going from the 3.33's to the 3.73's on a manual. You don't buy gears because people say they are good on a forum or because a certain ratio 'sounds about right'. You buy gears based on your MPH...period.
You establish what is going to be your max MPH in the 1/4 and you go with the tallest gear you can to not run out. That is drag 101 but for everyday street cars - yes, it's a little different and the 3.73's are going to be more 'fun' for you on the street but don't expect quicker ET's out of them unless you upgrade some other stuff to compliment them...
Despite what some people say, it is going to be HARDER to hook as go up in gears. This goes right along with what the vast majority of guys do...
make power 1st and worry about hooking later. This is why there are so many high HP cars out there but few 'fast' cars.
Hooking is #1 - power is second - that is the recipe for low et's...
(that and forget HP and worry about TORQUE...LOL)EDIT - I saw you have BFG's in your sig. Might gain a 10th with the 3.73's but still think you will need CA's and a panhard bar to see 2-3 tenths out of them.
Thread Starter
1st Gear Member
Joined: Jun 2007
Posts: 147
From:
RE: How much ET change does gears make?
ORIGINAL: modaddict
^^^Bingo!
And I would be surprised if he picks up 2 tenths with just 3.73's. The S197 is it's own animal and cannot be compared to anything other then other S197's when it comes to hooking the car...
If you haven't done anything else to your rear, what is going to happen is you are going to bite LESS with the 3.73's and my bet is you may actually lose a tenth.
If you want to really capitolize on the taller gear, you need to also upgrade your control arms, a panhard bar, and make sure you are using some good rubber. The taller gears are going to hit harder when you take off and make traction more difficult (not better or easier) with your stock set-up. Having said that - it is also a fact that there is not much gain going from the 3.33's to the 3.73's on a manual. You don't buy gears because people say they are good on a forum or because a certain ratio 'sounds about right'. You buy gears based on your MPH...period.
You establish what is going to be your max MPH in the 1/4 and you go with the tallest gear you can to not run out. That is drag 101 but for everyday street cars - yes, it's a little different and the 3.73's are going to be more 'fun' for you on the street but don't expect quicker ET's out of them unless you upgrade some other stuff to compliment them...
Despite what some people say, it is going to be HARDER to hook as go up in gears. This goes right along with what the vast majority of guys do...
make power 1st and worry about hooking later. This is why there are so many high HP cars out there but few 'fast' cars.
Hooking is #1 - power is second - that is the recipe for low et's... (that and forget HP and worry about TORQUE...LOL)
EDIT - I saw you have BFG's in your sig. Might gain a 10th with the 3.73's but still think you will need CA's and a panhard bar to see 2-3 tenths out of them.
^^^Bingo!
And I would be surprised if he picks up 2 tenths with just 3.73's. The S197 is it's own animal and cannot be compared to anything other then other S197's when it comes to hooking the car...
If you haven't done anything else to your rear, what is going to happen is you are going to bite LESS with the 3.73's and my bet is you may actually lose a tenth.
If you want to really capitolize on the taller gear, you need to also upgrade your control arms, a panhard bar, and make sure you are using some good rubber. The taller gears are going to hit harder when you take off and make traction more difficult (not better or easier) with your stock set-up. Having said that - it is also a fact that there is not much gain going from the 3.33's to the 3.73's on a manual. You don't buy gears because people say they are good on a forum or because a certain ratio 'sounds about right'. You buy gears based on your MPH...period.
You establish what is going to be your max MPH in the 1/4 and you go with the tallest gear you can to not run out. That is drag 101 but for everyday street cars - yes, it's a little different and the 3.73's are going to be more 'fun' for you on the street but don't expect quicker ET's out of them unless you upgrade some other stuff to compliment them...
Despite what some people say, it is going to be HARDER to hook as go up in gears. This goes right along with what the vast majority of guys do...
make power 1st and worry about hooking later. This is why there are so many high HP cars out there but few 'fast' cars.
Hooking is #1 - power is second - that is the recipe for low et's...
(that and forget HP and worry about TORQUE...LOL)EDIT - I saw you have BFG's in your sig. Might gain a 10th with the 3.73's but still think you will need CA's and a panhard bar to see 2-3 tenths out of them.
I can't launch the car any harder with the stock converter. At 1750 rpm the car tends to push out of the beams. I run 30lbs of air because that will make the car launch a tad quicker (RT thing). The higher air pressure and higher launch rpm the quicker the car launches. I really need to launch a bit harder , leaving at 1800rmp (if it was possible) would put me in the .00X RT range. I think the 4.10 might of put me there. Still hooking with them is questionable.
6th Gear Member
Joined: Apr 2007
Posts: 10,468
From: California
RE: How much ET change does gears make?
You M5 S197 guys almost don't even need gears with that wicked 1st and 2nd transmission gearing!! I've heard some of the M5 guys mention that the car pulls like a freight train in 1st and 2nd, and then peter out some in 3rd(relatively speaking). That 3.34 1st gear must wind the engine up awfully fast.
4th Gear Member
Joined: Nov 2007
Posts: 1,699
From:
RE: How much ET change does gears make?
ORIGINAL: kazman
The 3.73's dropped .05 in 60', 1.2 ET' , increased top mph by 1 mph and cross the finish just under 5K. Didn't have a problem hooking. I ran the drag radials at 30lbs and footbraked to 1500rpm. I was hitting .040 lights. Elimination rounds 2, 3, and 4 I was able to run the car flat out. Constant 2.11x 60' and ran 13.694, 13.696, and 13.697. Round 4 air got better and won tapping the brakes on the top end and ran a 13.705 on a 13.70 dial. I didn't go with the 4.10 because of gas mileage (drive 40 miles a day) and of the possible hooking issues with just drag radials and a stock supension.
I can't launch the car any harder with the stock converter. At 1750 rpm the car tends to push out of the beams. I run 30lbs of air because that will make the car launch a tad quicker (RT thing). The higher air pressure and higher launch rpm the quicker the car launches. I really need to launch a bit harder , leaving at 1800rmp (if it was possible) would put me in the .00X RT range. I think the 4.10 might of put me there. Still hooking with them is questionable.
ORIGINAL: modaddict
^^^Bingo!
And I would be surprised if he picks up 2 tenths with just 3.73's. The S197 is it's own animal and cannot be compared to anything other then other S197's when it comes to hooking the car...
If you haven't done anything else to your rear, what is going to happen is you are going to bite LESS with the 3.73's and my bet is you may actually lose a tenth.
If you want to really capitolize on the taller gear, you need to also upgrade your control arms, a panhard bar, and make sure you are using some good rubber. The taller gears are going to hit harder when you take off and make traction more difficult (not better or easier) with your stock set-up. Having said that - it is also a fact that there is not much gain going from the 3.33's to the 3.73's on a manual. You don't buy gears because people say they are good on a forum or because a certain ratio 'sounds about right'. You buy gears based on your MPH...period.
You establish what is going to be your max MPH in the 1/4 and you go with the tallest gear you can to not run out. That is drag 101 but for everyday street cars - yes, it's a little different and the 3.73's are going to be more 'fun' for you on the street but don't expect quicker ET's out of them unless you upgrade some other stuff to compliment them...
Despite what some people say, it is going to be HARDER to hook as go up in gears. This goes right along with what the vast majority of guys do...
make power 1st and worry about hooking later. This is why there are so many high HP cars out there but few 'fast' cars.
Hooking is #1 - power is second - that is the recipe for low et's... (that and forget HP and worry about TORQUE...LOL)
EDIT - I saw you have BFG's in your sig. Might gain a 10th with the 3.73's but still think you will need CA's and a panhard bar to see 2-3 tenths out of them.
^^^Bingo!
And I would be surprised if he picks up 2 tenths with just 3.73's. The S197 is it's own animal and cannot be compared to anything other then other S197's when it comes to hooking the car...
If you haven't done anything else to your rear, what is going to happen is you are going to bite LESS with the 3.73's and my bet is you may actually lose a tenth.
If you want to really capitolize on the taller gear, you need to also upgrade your control arms, a panhard bar, and make sure you are using some good rubber. The taller gears are going to hit harder when you take off and make traction more difficult (not better or easier) with your stock set-up. Having said that - it is also a fact that there is not much gain going from the 3.33's to the 3.73's on a manual. You don't buy gears because people say they are good on a forum or because a certain ratio 'sounds about right'. You buy gears based on your MPH...period.
You establish what is going to be your max MPH in the 1/4 and you go with the tallest gear you can to not run out. That is drag 101 but for everyday street cars - yes, it's a little different and the 3.73's are going to be more 'fun' for you on the street but don't expect quicker ET's out of them unless you upgrade some other stuff to compliment them...
Despite what some people say, it is going to be HARDER to hook as go up in gears. This goes right along with what the vast majority of guys do...
make power 1st and worry about hooking later. This is why there are so many high HP cars out there but few 'fast' cars.
Hooking is #1 - power is second - that is the recipe for low et's...
(that and forget HP and worry about TORQUE...LOL)EDIT - I saw you have BFG's in your sig. Might gain a 10th with the 3.73's but still think you will need CA's and a panhard bar to see 2-3 tenths out of them.
I can't launch the car any harder with the stock converter. At 1750 rpm the car tends to push out of the beams. I run 30lbs of air because that will make the car launch a tad quicker (RT thing). The higher air pressure and higher launch rpm the quicker the car launches. I really need to launch a bit harder , leaving at 1800rmp (if it was possible) would put me in the .00X RT range. I think the 4.10 might of put me there. Still hooking with them is questionable.
4th Gear Member
Joined: Aug 2005
Posts: 1,940
From: alberta, canada
RE: How much ET change does gears make?
ORIGINAL: modaddict
Yep - right about what I thought. Good numbers and great consistency. You are dangerous in the brackets sir!
ORIGINAL: kazman
The 3.73's dropped .05 in 60', 1.2 ET' , increased top mph by 1 mph and cross the finish just under 5K. Didn't have a problem hooking. I ran the drag radials at 30lbs and footbraked to 1500rpm. I was hitting .040 lights. Elimination rounds 2, 3, and 4 I was able to run the car flat out. Constant 2.11x 60' and ran 13.694, 13.696, and 13.697. Round 4 air got better and won tapping the brakes on the top end and ran a 13.705 on a 13.70 dial. I didn't go with the 4.10 because of gas mileage (drive 40 miles a day) and of the possible hooking issues with just drag radials and a stock supension.
I can't launch the car any harder with the stock converter. At 1750 rpm the car tends to push out of the beams. I run 30lbs of air because that will make the car launch a tad quicker (RT thing). The higher air pressure and higher launch rpm the quicker the car launches. I really need to launch a bit harder , leaving at 1800rmp (if it was possible) would put me in the .00X RT range. I think the 4.10 might of put me there. Still hooking with them is questionable.
ORIGINAL: modaddict
^^^Bingo!
And I would be surprised if he picks up 2 tenths with just 3.73's. The S197 is it's own animal and cannot be compared to anything other then other S197's when it comes to hooking the car...
If you haven't done anything else to your rear, what is going to happen is you are going to bite LESS with the 3.73's and my bet is you may actually lose a tenth.
If you want to really capitolize on the taller gear, you need to also upgrade your control arms, a panhard bar, and make sure you are using some good rubber. The taller gears are going to hit harder when you take off and make traction more difficult (not better or easier) with your stock set-up. Having said that - it is also a fact that there is not much gain going from the 3.33's to the 3.73's on a manual. You don't buy gears because people say they are good on a forum or because a certain ratio 'sounds about right'. You buy gears based on your MPH...period.
You establish what is going to be your max MPH in the 1/4 and you go with the tallest gear you can to not run out. That is drag 101 but for everyday street cars - yes, it's a little different and the 3.73's are going to be more 'fun' for you on the street but don't expect quicker ET's out of them unless you upgrade some other stuff to compliment them...
Despite what some people say, it is going to be HARDER to hook as go up in gears. This goes right along with what the vast majority of guys do...
make power 1st and worry about hooking later. This is why there are so many high HP cars out there but few 'fast' cars.
Hooking is #1 - power is second - that is the recipe for low et's... (that and forget HP and worry about TORQUE...LOL)
EDIT - I saw you have BFG's in your sig. Might gain a 10th with the 3.73's but still think you will need CA's and a panhard bar to see 2-3 tenths out of them.
^^^Bingo!
And I would be surprised if he picks up 2 tenths with just 3.73's. The S197 is it's own animal and cannot be compared to anything other then other S197's when it comes to hooking the car...
If you haven't done anything else to your rear, what is going to happen is you are going to bite LESS with the 3.73's and my bet is you may actually lose a tenth.
If you want to really capitolize on the taller gear, you need to also upgrade your control arms, a panhard bar, and make sure you are using some good rubber. The taller gears are going to hit harder when you take off and make traction more difficult (not better or easier) with your stock set-up. Having said that - it is also a fact that there is not much gain going from the 3.33's to the 3.73's on a manual. You don't buy gears because people say they are good on a forum or because a certain ratio 'sounds about right'. You buy gears based on your MPH...period.
You establish what is going to be your max MPH in the 1/4 and you go with the tallest gear you can to not run out. That is drag 101 but for everyday street cars - yes, it's a little different and the 3.73's are going to be more 'fun' for you on the street but don't expect quicker ET's out of them unless you upgrade some other stuff to compliment them...
Despite what some people say, it is going to be HARDER to hook as go up in gears. This goes right along with what the vast majority of guys do...
make power 1st and worry about hooking later. This is why there are so many high HP cars out there but few 'fast' cars.
Hooking is #1 - power is second - that is the recipe for low et's...
(that and forget HP and worry about TORQUE...LOL)EDIT - I saw you have BFG's in your sig. Might gain a 10th with the 3.73's but still think you will need CA's and a panhard bar to see 2-3 tenths out of them.
I can't launch the car any harder with the stock converter. At 1750 rpm the car tends to push out of the beams. I run 30lbs of air because that will make the car launch a tad quicker (RT thing). The higher air pressure and higher launch rpm the quicker the car launches. I really need to launch a bit harder , leaving at 1800rmp (if it was possible) would put me in the .00X RT range. I think the 4.10 might of put me there. Still hooking with them is questionable.