M50/ZF with 2.79 final drive

[dude8383]

Ah you are right they are identical from 3rd-5th. I have no idea how someone would run a 3.91 then.



4.25k on the freeway, yuck

Can you send me that excel?!

I don't have anything to add to the subject besides the fact I'd never go with a gearing that tall, but you've got an amazing looking car.

I don't know man, 3.25 is pretty ideal with the G250 and ZF boxes and thank you :giggle:

[Elysian]

Can you send me that excel?!



I don't know man, 3.25 is pretty ideal with the G250 and ZF boxes and thank you :giggle:

I meant the 2.79 the OP was asking about :D

[Uber E30]

Can you send me that excel?!

sure PM me your email

[nrubenstein]

Did you mean to say M50?

If you did would your comments also apply to S50B30?

No, I meant to say S50. But I will freely admit that my sensation butt dyno is calibrated around the S54.

[alexbaby88]

Sounds like the consensus is that 2.79 would be too tall. Dam looks like I need 6 sp box then...

[e30polak]

I think a 2.93 is your best option. For an s50/s52, especially ones with bolt-ons and a tune I wouldn't choose anything else.

I had a 3.25, 3.46, and 2.93 when I had my swap car. The 3.46 was more fun for street driving since the gearing was more aggressive. The 3.25 was a good compromise between the 3.25 and the 3.46. But the 2.93 was a lot more fun on the freeway, and had the longest 1st and 2nd gear. Being able to downshift to 3rd at 80 and ring it out to 100 was awesome! Also the ZF + 2.93 cruised at only 2600 rpms at 80 with my 235/40/17s! It also had a faster 0-60 then my 3.46 since I could go to 65 in 2nd gear.

Consequently, the 2.79 would be a bit too long IMO.

[alexbaby88]

I think a 2.93 is your best option. For an s50/s52, especially ones with bolt-ons and a tune I wouldn't choose anything else.

I had a 3.25, 3.46, and 2.93 when I had my swap car. The 3.46 was more fun for street driving since the gearing was more aggressive. The 3.25 was a good compromise between the 3.25 and the 3.46. But the 2.93 was a lot more fun on the freeway, and had the longest 1st and 2nd gear. Being able to downshift to 3rd at 80 and ring it out to 100 was awesome! Also the ZF + 2.93 cruised at only 2600 rpms at 80 with my 235/40/17s! It also had a faster 0-60 then my 3.46 since I could go to 65 in 2nd gear.

Consequently, the 2.79 would be a bit too long IMO.

Great summary, thanks!

[turbo325i]

Bla Bla Bla.

+1! I went from a 3.73 to 3.25 in my turbo e30 with the m20/g260 combo and LOVED it!

Now I have an m52/ZF and with no overdrive I cannot imagine running the 3.73 AT ALL. The 3.25 will be in for the break in, and then the 2.79lsd is going in! With my tires 265/35/18 I am able to reach 46mph in 1st...


Kinda hard to read, but this gives me a "mechanical" top speed of 194... hmmm Salt Flat ready!




Tire Size
265/35/18
OR
Tire Diameter
(in inches)
OR
Revolutions Per Mile

Axle Ratio 2.79
Redline (RPM)7200
First Gear 4.20
Second Gear 2.49
Third Gear 1.66
Fourth Gear 1.24
Fifth Gear 1.0
Sixth Gear


RPM 1 2 3 4 5th gear

500 3 5 8 11 13
600 4 7 10 13 16
700 4 8 11 15 19
800 5 9 13 17 22
900 6 10 15 20 24
1000 6 11 16 22 27
1100 7 12 18 24 30
1200 8 13 20 26 32
1300 8 14 21 28 35
1400 9 15 23 30 38
1500 10 16 24 33 40
1600 10 17 26 35 43
1700 11 18 28 37 46
1800 12 20 29 39 49
1900 12 21 31 41 51
2000 13 22 33 44 54
2100 13 23 34 46 57
2200 14 24 36 48 59
2300 15 25 37 50 62
2400 15 26 39 52 65
2500 16 27 41 54 67
2600 17 28 42 57 70
2700 17 29 44 59 73
2800 18 30 46 61 76
2900 19 31 47 63 78
3000 19 33 49 65 81
3100 20 34 50 67 84
3200 21 35 52 70 86
3300 21 36 54 72 89
3400 22 37 55 74 92
3500 22 38 57 76 94
3600 23 39 59 78 97
3700 24 40 60 81 100
3800 24 41 62 83 103
3900 25 42 63 85 105
4000 26 43 65 87 108
4100 26 44 67 89 111
4200 27 46 68 91 113
4300 28 47 70 94 116
4400 28 48 72 96 119
4500 29 49 73 98 121
4600 30 50 75 100 124
4700 30 51 76 102 127
4800 31 52 78 104 130
4900 31 53 80 107 132
5000 32 54 81 109 135
5100 33 55 83 111 138
5200 33 56 85 113 140
5300 34 57 86 115 143
5400 35 59 88 117 146
5500 35 60 89 120 148
5600 36 61 91 122 151
5700 37 62 93 124 154
5800 37 63 94 126 156
5900 38 64 96 128 159
6000 39 65 98 131 162
6100 39 66 99 133 165
6200 40 67 101 135 167
6300 40 68 102 137 170
6400 41 69 104 139 173
6500 42 70 106 141 175
6600 42 72 107 144 178
6700 43 73 109 146 181
6800 44 74 111 148 183
6900 44 75 112 150 186
7000 45 76 114 152 189
7100 46 77 115 154 192
7200 46 78 117 157 194

[Elysian]

My 325e has a 2.93LSD in it(I believe that's the gearing), but that gearing will never, ever, see the street. I'll be rebuilding the diff before I ever even put the car on the road.

[turbo325i]

My 325e has a 2.93LSD in it(I believe that's the gearing), but that gearing will never, ever, see the street. I'll be rebuilding the diff before I ever even put the car on the road.

Ok... Why?

[Elysian]

Ok... Why?

Had a 3.15 in my E46(which is where the motor is coming from for my E30), and wanted a 3.46, that's why. I'd never get along with such a tall ratio in the E30.

[turbo325i]

You will do better with a tall ratio because those e30 tires are much smaller than your e46's... But to each his own... I dont want to cruise 80mph and 4500rpm...