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The Terminator
Driveline
Soo happy!! 3.90's are on!
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<blockquote data-quote="jtfx6552" data-source="post: 1752259" data-attributes="member: 3823"><p>Cars were very similar, only difference was the gearing, and the 4.10's were slower. Comparing the ETs then and comparing with the ETs "on the list" now, The results were the same, there were just less differences to obscure that fact.</p><p></p><p></p><p></p><p>AT BG, track prep was outstanding, still the 4.10 cars could not compete. </p><p></p><p></p><p>An 03/04 with driver weighs in at 3800 lbs plus, staticly, much less than half that weight on the rear wheels. As you know friction depends on the "normal" force. Even if the 03/04 transfers enough weight to lift the front wheels, and given the moment arm on stock sized tires is about 1 foot, what coefficient of friction will you need to hook up 5000 lb ft?, looks like 1.31. Now that is with 3.55's! Now with 4.10's the numbers grow to 5774 lb ft and a cf of 1.51. On a super prepped track with slicks front wheels in the air, maybe. On a car with "stock" suspension with weight on the front wheels...sounds like spinning to me. For comparison, it looks like you 99 routinely held about 1.38-1.46 (300 lb ft at the engine, 15.26:1 reduction 3300-3500 lbs total weight). Of course, in actuality with all cars on launch, there is the added smack of the inertia of the rotating engine and flywheel. VHT is a racers friend...</p><p></p><p></p><p></p><p>Agreed</p><p></p><p></p><p> Agreed, the issue is traction and what it takes to get it. First you need to transfer weight so whatever tires you have in the back can get the grip to transfer even more weight, Since my car is a street car that I like to be able to go around turns and over bumps, transfer and hence traction are limited. For a purpose built 1/4 mile car, I'm sure the suspension can be tweaked to take advantage of the extra T in 1st. </p><p></p><p></p><p></p><p></p><p>I have heard numbers that high talked about ($800 does seem more typical), the pumkin needs to come out they say, so it is pricier than on a straight axle.</p><p></p><p></p><p> You implied I had never taken a car and upped the gears. While I learned form others mistakes and haven't done it on my '03, I have done it in the past. The theoretical results were the car would be faster, in actual racing it wasn't.</p><p></p><p></p><p></p><p>Agreed, however, the auto '03 I was in launched hard on 3.55's since the convertor gives some multilplication. </p><p></p><p></p><p> Since the ability to translate rotaional force into movement depends on the normal force and friction, the distribution of weight and "tightness" of the suspension is critical. If the weight from the front can't be transferred to the rear then the required cf goes through the roof, i.e. trying to move 3800 lbs with only 1750 on the rear axle is a recipe for tire smoke.</p><p></p><p> I know a few who shift their T-56's as fast as they can be shifted, so I know it isn't that. The lack of transfer does hurt, though, because quick shifts, especially the 1-2 can really break loose the tires, I have seen ET drags, ET streets and BFG dr's all go up in smoke on a good shift. </p><p></p><p></p><p></p><p>Once you do those mods, then the car is no longer the <em>typical</em> '03/'04 Cobra. I am sure more gear won't hurt in that situation. It is ashame we will never know how much, exactly it helped. What do you think just the ratio change will take off your ET?</p><p></p><p></p><p></p><p>I like to drive my car to the track, which means DR's in the rear, normal sized wheels and radials up front, non drag shocks and springs. Even on the best prepped tracks, the car is traction limited.</p><p></p><p></p><p></p><p>Thanks, I did. I hope you did, too.</p><p></p><p>JT</p></blockquote><p></p>
[QUOTE="jtfx6552, post: 1752259, member: 3823"] Cars were very similar, only difference was the gearing, and the 4.10's were slower. Comparing the ETs then and comparing with the ETs "on the list" now, The results were the same, there were just less differences to obscure that fact. AT BG, track prep was outstanding, still the 4.10 cars could not compete. An 03/04 with driver weighs in at 3800 lbs plus, staticly, much less than half that weight on the rear wheels. As you know friction depends on the "normal" force. Even if the 03/04 transfers enough weight to lift the front wheels, and given the moment arm on stock sized tires is about 1 foot, what coefficient of friction will you need to hook up 5000 lb ft?, looks like 1.31. Now that is with 3.55's! Now with 4.10's the numbers grow to 5774 lb ft and a cf of 1.51. On a super prepped track with slicks front wheels in the air, maybe. On a car with "stock" suspension with weight on the front wheels...sounds like spinning to me. For comparison, it looks like you 99 routinely held about 1.38-1.46 (300 lb ft at the engine, 15.26:1 reduction 3300-3500 lbs total weight). Of course, in actuality with all cars on launch, there is the added smack of the inertia of the rotating engine and flywheel. VHT is a racers friend... Agreed Agreed, the issue is traction and what it takes to get it. First you need to transfer weight so whatever tires you have in the back can get the grip to transfer even more weight, Since my car is a street car that I like to be able to go around turns and over bumps, transfer and hence traction are limited. For a purpose built 1/4 mile car, I'm sure the suspension can be tweaked to take advantage of the extra T in 1st. I have heard numbers that high talked about ($800 does seem more typical), the pumkin needs to come out they say, so it is pricier than on a straight axle. You implied I had never taken a car and upped the gears. While I learned form others mistakes and haven't done it on my '03, I have done it in the past. The theoretical results were the car would be faster, in actual racing it wasn't. Agreed, however, the auto '03 I was in launched hard on 3.55's since the convertor gives some multilplication. Since the ability to translate rotaional force into movement depends on the normal force and friction, the distribution of weight and "tightness" of the suspension is critical. If the weight from the front can't be transferred to the rear then the required cf goes through the roof, i.e. trying to move 3800 lbs with only 1750 on the rear axle is a recipe for tire smoke. I know a few who shift their T-56's as fast as they can be shifted, so I know it isn't that. The lack of transfer does hurt, though, because quick shifts, especially the 1-2 can really break loose the tires, I have seen ET drags, ET streets and BFG dr's all go up in smoke on a good shift. Once you do those mods, then the car is no longer the [i]typical[/i] '03/'04 Cobra. I am sure more gear won't hurt in that situation. It is ashame we will never know how much, exactly it helped. What do you think just the ratio change will take off your ET? I like to drive my car to the track, which means DR's in the rear, normal sized wheels and radials up front, non drag shocks and springs. Even on the best prepped tracks, the car is traction limited. Thanks, I did. I hope you did, too. JT [/QUOTE]
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