A4 and 4.10 gears users inside please
04-08-2004, 09:35 AM
#1
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A4 and 4.10 gears users inside please I have a 200-4r w/transbrake in my car with 4.10's out back and a SS3800E verter and right now 26" ET Streets but soon to be 28" streets or drags. Last year I ran 112mph on street tires in the quarter and since then I have added the NXL kit and I am in the process of getting a H/C package.
My question is will I be able to cross the traps without hitting the rev limiter? I am going to raise the limiter to 6800 with the stock bottom end. Should I go a little higher on the rev limiter?
I really dont want to have to shift into OD, but if I do am I gonna hurt stuff badly?
I am guessing without the h/c I will be trapping around 120ish and with the heads and cam around 135ish (It is in a 93 RX7 so I only weigh around 2900lbs).
I will be at the track in 2-3 weeks so let hear some input.
What do you think? I dont have to many gear options the lowest I can go is 3.9.
Mike
My question is will I be able to cross the traps without hitting the rev limiter? I am going to raise the limiter to 6800 with the stock bottom end. Should I go a little higher on the rev limiter?
I really dont want to have to shift into OD, but if I do am I gonna hurt stuff badly?
I am guessing without the h/c I will be trapping around 120ish and with the heads and cam around 135ish (It is in a 93 RX7 so I only weigh around 2900lbs).
I will be at the track in 2-3 weeks so let hear some input.
What do you think? I dont have to many gear options the lowest I can go is 3.9.
Mike
04-08-2004, 10:43 PM
#3
Output from the calculator on my site Speed vs RPM .
I think you need a numerically smaller gear or a bigger tire.
Code:
Transmission Ratios: 1st: 2.74 2nd: 1.57 3rd: 1 4th: 0.67 Tire Diameter 1: 28 inches Rear Gear Ratio 1: 4.1:1 RPM 1st 2nd 3rd 4th 5th 6th 1000 7 12 19 29 0 0 1500 10 18 29 43 0 0 2000 14 24 38 57 0 0 2500 17 30 48 71 0 0 3000 21 36 57 86 0 0 3500 24 43 67 100 0 0 4000 28 49 76 114 0 0 4500 31 55 86 128 0 0 5000 35 61 95 143 0 0 5500 38 67 105 157 0 0 6000 42 73 115 171 0 0 6500 45 79 124 185 0 0 7000 49 85 134 200 0 0 7500 52 91 143 214 0 0 8000 56 97 153 228 0 0
04-09-2004, 10:04 AM
#4
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Why do I have to log in to use your programs?
I'm running 28x10.5x15 et drags, 2.48 first gear T400, Yank 4500, shift points at 7000, with 750rwhp what gear do I need? I am running a 4.11 but it's too much.
I'm running 28x10.5x15 et drags, 2.48 first gear T400, Yank 4500, shift points at 7000, with 750rwhp what gear do I need? I am running a 4.11 but it's too much.
04-09-2004, 10:22 AM
#6
Originally Posted by Pro Stock John
Why do I have to log in to use your programs?
I'm running 28x10.5x15 et drags, 2.48 first gear T400, Yank 4500, shift points at 7000, with 750rwhp what gear do I need? I am running a 4.11 but it's too much.
I'm running 28x10.5x15 et drags, 2.48 first gear T400, Yank 4500, shift points at 7000, with 750rwhp what gear do I need? I am running a 4.11 but it's too much.
Regarding the gear you need what mph does the car trap at now? Here is the output for you set up, this assumes a 6% torque converter slip.
Use this Calculator for comparing two different gear ratio's.
Code:
Transmission Ratios: 1st: 2.48 2nd: 1.48 3rd: 1 Tire Diameter 1: 28 inches Rear Gear Ratio 1: 4.11:1 MPH RPM 1st 2nd 3rd 4th 5th 6th 1000 8 13 19 0 0 0 1500 12 19 29 0 0 0 2000 15 26 38 0 0 0 2500 19 32 48 0 0 0 3000 23 39 57 0 0 0 3500 27 45 67 0 0 0 4000 31 51 76 0 0 0 4500 35 58 86 0 0 0 5000 38 64 95 0 0 0 5500 42 71 105 0 0 0 6000 46 77 114 0 0 0 6500 50 84 124 0 0 0 7000 54 90 133 0 0 0 7500 58 97 143 0 0 0 8000 61 103 152 0 0 0 Tire Diameter 2: 28 inches Rear Gear Ratio 2: 3.73:1 MPH RPM 1st 2nd 3rd 4th 5th 6th 1000 8 14 21 0 0 0 1500 13 21 31 0 0 0 2000 17 28 42 0 0 0 2500 21 35 52 0 0 0 3000 25 43 63 0 0 0 3500 30 50 73 0 0 0 4000 34 57 84 0 0 0 4500 38 64 94 0 0 0 5000 42 71 105 0 0 0 5500 47 78 115 0 0 0 6000 51 85 126 0 0 0 6500 55 92 136 0 0 0 7000 59 99 147 0 0 0 7500 63 106 157 0 0 0 8000 68 113 168 0 0 0
You can try the quarter mile simulator eDragstrip but the traction algorithm needs some work. It works really well for cars under 350 Wheel HP.
Last edited by smokemup; 04-09-2004 at 11:35 AM.
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04-09-2004, 10:32 AM
#8
Originally Posted by gator's 99TA
tire growth is an issue too.
My calcs do NOT account for tire growth. I haven't been able to figure out a good growth algorithm. I assume growth is a function of rpm but I have no way to measure it in the real world. Therefore I keep it simple and assume no tire growth.
