kw1k

Fab 8 has his FEED 4.777 Final drive installed here is the PM he sent me with a bit of info on it

"I did do a pull with a wrx from 60kmh (35 mph) to 140kmh (87 mph) and I actually beat him by 2 car lengths...

So far, no regrets on the gear set - fuel consumption remains the same. I would definitely recommend this mod.

Will let you know if I get to run against another 8.

Cheers"


Now Idk about you guys but Putting 2 + cars on a WRX is pretty good!

QBallz

The real question is the FEED 4.777 really the Kia 4.777 which is really a Mazda made 4.777?

IZoomZoomI

and the plot thickens

Vaillant

I'm with you. I don't need to be able to accelerate briskly in 6th...I just want to maintain speed and get better gas mileage.

A taller sixth with a shorter final drive could be the best of both worlds.

~ Matt

therm8

Hahah, i'd lay $100 bucks on it being true.


Everyone keeps yammering about a taller 6th gear. That's going to be extremely expensive if you have to make a new 6th. And just plain expensive if you can source one from some other tranny. The cost of this mod vs the cost of maybe 1mpg lower economy just doesn't make sense to me.

LiL BenNy

from what i understand the 4.444 are the best according to the graph?

evilmiata

Didn't I just post this in another thread? The 99+ miata uses the same 6speed. Its accepted knowledge among autocrossers that the 5speed transmission is superior to the 6speed, since less shifts are required. The 5speed would probably eliminate 3rd gear shifts for all except on extremely fast courses. Plus, the top gear in the 5speed is taller than our 6speed. The 1st gear in the 5speed is taller, but would be perfect for FI.

http://members.aol.com/solomiata/Drivetrain.html

Xyntax

So if we get this shorter final drive, we should be able to sell our stock ones to the S2K community right? I saw something there that it costs about $600 for them to purchase our gears. We could probably sell it for $400 - $500 and give them a deal. That pretty much pays off for the shorter gear for us.

therm8

best at what? Final drive is all about compromise. You'll get better acceleration with the 4.778s, but a lower speed at any given point. For the same speed you'll be at a higher rpm with the 4.778s.

IZoomZoomI

how much would it cost to install?

Slick8

The FEED, KIA and Mazda are the same 4.777, but are really 4.77777777777777777... Hence 4.778.

They are all manufacture by Mazda.

Slick8

2004 WRX Perfomance Numbers from SportCompactCar
0-30 mph : 2.0 sec.
0-60 mph : 5.2 sec.
30-50 mph : 2.3 sec.
50-70 mph : 3.4 sec.
Quarter Mile time : 14.6 sec.
Quarter Mile speed : 91.8 mph

If your pulling on a WRX 2 car lengths like that, what would your 1/4 and 0-60 be?

Mindful of the low torque on the rotary, it looks like 0-60 is less than 5.2 sec and the 1/4 much lower than 14.6sec -- Did Polak do the 1/4 in 14.6 sec bone stock?

IZoomZoomI

Yea you would have to run 14.0 to beat a wrx by two car lengths. I don't think it's impossible, depends on how much he spent on mods.

ULLLOSE

iTrader: (1)

We get a 4.7% gear change with our autox tires

Tire Size Sidewall Diameter Circumference Rev/Mile Difference
225/45-18 4.0 in. 25.97 in. 81.59 in. 777 0.0%
245/35-18 3.4 in. 24.75 in. 77.76 in. 815 -4.7%

225-45-18
RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear
500 2 4 5 7 9 10
600 3 5 6 9 10 12
700 3 5 7 10 12 14
800 4 6 8 12 14 17
900 4 7 10 13 16 19
1000 5 8 11 15 17 21
1100 5 8 12 16 19 23
1200 6 9 13 18 21 25
1300 6 10 14 19 23 27
1400 6 11 15 21 24 29
1500 7 12 16 22 26 31
1600 7 12 17 23 28 33
1700 8 13 18 25 30 35
1800 8 14 19 26 31 37
1900 9 15 20 28 33 39
2000 9 15 21 29 35 41
2100 10 16 22 31 37 43
2200 10 17 23 32 38 45
2300 11 18 24 34 40 47
2400 11 18 25 35 42 50
2500 12 19 26 37 44 52
2600 12 20 28 38 45 54
2700 12 21 29 40 47 56
2800 13 21 30 41 49 58
2900 13 22 31 43 50 60
3000 14 23 32 44 52 62
3100 14 24 33 45 54 64
3200 15 25 34 47 56 66
3300 15 25 35 48 57 68
3400 16 26 36 50 59 70
3500 16 27 37 51 61 72
3600 17 28 38 53 63 74
3700 17 28 39 54 64 76
3800 18 29 40 56 66 78
3900 18 30 41 57 68 81
4000 19 31 42 59 70 83
4100 19 31 43 60 71 85
4200 19 32 44 62 73 87
4300 20 33 45 63 75 89
4400 20 34 47 65 77 91
4500 21 35 48 66 78 93
4600 21 35 49 67 80 95
4700 22 36 50 69 82 97
4800 22 37 51 70 84 99
4900 23 38 52 72 85 101
5000 23 38 53 73 87 103
5100 24 39 54 75 89 105
5200 24 40 55 76 90 107
5300 25 41 56 78 92 109
5400 25 41 57 79 94 111
5500 25 42 58 81 96 114
5600 26 43 59 82 97 116
5700 26 44 60 84 99 118
5800 27 44 61 85 101 120
5900 27 45 62 87 103 122
6000 28 46 63 88 104 124
6100 28 47 65 89 106 126
6200 29 48 66 91 108 128
6300 29 48 67 92 110 130
6400 30 49 68 94 111 132
6500 30 50 69 95 113 134
6600 31 51 70 97 115 136
6700 31 51 71 98 117 138
6800 31 52 72 100 118 140
6900 32 53 73 101 120 142
7000 32 54 74 103 122 145
7100 33 54 75 104 124 147
7200 33 55 76 106 125 149
7300 34 56 77 107 127 151
7400 34 57 78 108 129 153
7500 35 58 79 110 131 155
7600 35 58 80 111 132 157
7700 36 59 81 113 134 159
7800 36 60 83 114 136 161
7900 37 61 84 116 137 163
8000 37 61 85 117 139 165
8100 37 62 86 119 141 167
8200 38 63 87 120 143 169
8300 38 64 88 122 144 171
8400 39 64 89 123 146 173
8500 39 65 90 125 148 175
8600 40 66 91 126 150 178
8700 40 67 92 128 151 180
8800 41 67 93 129 153 182
8900 41 68 94 130 155 184
9000 42 69 95 132 157 186

245-35-18
RPM 1st Gear 2nd Gear 3rd Gear 4th Gear 5th Gear 6th Gear
500 2 4 5 7 8 10
600 3 4 6 8 10 12
700 3 5 7 10 12 14
800 4 6 8 11 13 16
900 4 7 9 13 15 18
1000 4 7 10 14 17 20
1100 5 8 11 15 18 22
1200 5 9 12 17 20 24
1300 6 10 13 18 22 26
1400 6 10 14 20 23 28
1500 7 11 15 21 25 30
1600 7 12 16 22 27 31
1700 7 12 17 24 28 33
1800 8 13 18 25 30 35
1900 8 14 19 27 32 37
2000 9 15 20 28 33 39
2100 9 15 21 29 35 41
2200 10 16 22 31 36 43
2300 10 17 23 32 38 45
2400 11 18 24 34 40 47
2500 11 18 25 35 41 49
2600 11 19 26 36 43 51
2700 12 20 27 38 45 53
2800 12 20 28 39 46 55
2900 13 21 29 41 48 57
3000 13 22 30 42 50 59
3100 14 23 31 43 51 61
3200 14 23 32 45 53 63
3300 15 24 33 46 55 65
3400 15 25 34 48 56 67
3500 15 26 35 49 58 69
3600 16 26 36 50 60 71
3700 16 27 37 52 61 73
3800 17 28 38 53 63 75
3900 17 29 39 54 65 77
4000 18 29 40 56 66 79
4100 18 30 41 57 68 81
4200 19 31 42 59 70 83
4300 19 31 43 60 71 85
4400 19 32 44 61 73 87
4500 20 33 45 63 75 89
4600 20 34 46 64 76 90
4700 21 34 47 66 78 92
4800 21 35 48 67 80 94
4900 22 36 49 68 81 96
5000 22 37 50 70 83 98
5100 22 37 51 71 85 100
5200 23 38 52 73 86 102
5300 23 39 53 74 88 104
5400 24 39 54 75 90 106
5500 24 40 55 77 91 108
5600 25 41 56 78 93 110
5700 25 42 57 80 95 112
5800 26 42 58 81 96 114
5900 26 43 59 82 98 116
6000 26 44 60 84 100 118
6100 27 45 62 85 101 120
6200 27 45 63 87 103 122
6300 28 46 64 88 104 124
6400 28 47 65 89 106 126
6500 29 48 66 91 108 128
6600 29 48 67 92 109 130
6700 30 49 68 94 111 132
6800 30 50 69 95 113 134
6900 30 50 70 96 114 136
7000 31 51 71 98 116 138
7100 31 52 72 99 118 140
7200 32 53 73 101 119 142
7300 32 53 74 102 121 144
7400 33 54 75 103 123 146
7500 33 55 76 105 124 148
7600 34 56 77 106 126 150
7700 34 56 78 108 128 151
7800 34 57 79 109 129 153
7900 35 58 80 110 131 155
8000 35 58 81 112 133 157
8100 36 59 82 113 134 159
8200 36 60 83 115 136 161
8300 37 61 84 116 138 163
8400 37 61 85 117 139 165
8500 37 62 86 119 141 167
8600 38 63 87 120 143 169
8700 38 64 88 122 144 171
8800 39 64 89 123 146 173
8900 39 65 90 124 148 175
9000 40 66 91 126 149 177

Slick8

It's obvious that that WRX would at least have an intake/exhaust/cat if it wanted to play in a street race .

QBallz

They didn't run a 1/4 mile. I imagine it would be a lot closer from a standing start since the WRX would launch better because of the AWD.

army_rx8

well got home from work (damn night shift) and found a nice final gear / tranny gear ratio speed calcualtor thingy online..and what do i find...some oen already answered my ? haha oh well...here is the site for all those interested.

http://www.csgnetwork.com/speedcalc.html

now to find out how much these gears will cost threw my parts people at work...muahaha

anyone know the car these came out of (mazda) or a part number so i can check how much it'll set me back?

kngfmsta

so what does the "yellow box" have to do with gears, does it free up hp?....and its something you buy after you get the gears right....or maybe no....im kinda confused

kw1k

What the yellow box does is it just corrects the speedo to go according the the RPMS

Mazmart

iTrader: (12)

This thread is very interesting. I'm waiting for some here to spend the money and come to a few shocking realizations.
Paul.

MadDog

Thats an infuriating post. Why don't you just come out and say what you are thinking instead of alluding to something in such a passive-agressive way?

Slick8

Republican scare tactic anyone?

EXHIBIT A: Based on ALL the thorough evidence presented,

EXHIBIT B: And the "quote" from ,

EXHIBIT C: Hmmmm, I wonder where gets the 4.10 gears for the diff swap from ,

VERDICT: What does the JURY conclude...

Mazmart

iTrader: (12)

Mad dog, please don't be mad. I'm just having a little fun. There are several ways to skin a cat and as some may find it is more than possible to re-create what we are going to be offering. Our greatest advantage is actually not in the accessability of the parts but in fact the person putting them together. This is not an us vs you thing. I don't have any 4.778 gears to offer any how. One of the points to give good consideration to any who chose to change their ratios at all find someone extremely versed. That's my helpful advice. The other thing is you guys are totally barking up the wrong tree for the particular ring and pinion that you are looking for.
Also if you knmow how to get the correct gears and would like to have us put it together, let me know.
Hopefully I can be loved by all again.
Paul.

rotarygod

I'm just going to sit back and wait for the eye opening reaction of those who actually think that a 4.77 gear will give them better gas mileage anwhere compared to what they have now. That ought to be a good one.

I still like you Paul!

Mazmart

iTrader: (12)

Thanks dude.