just got back from driving a 635 csi

[00soul]

nice car, it didnt seem like i was going fast then i look at the speedo and im cruising at 80, it felt like i was going 40. that car is built though. handles incredibly sell for a car of its size. i really want to get one now, my borhter is getting his license soon and im trying to convince him to get one just so i can look at it everyday

[PasadenaE24]

Meh, handling is ok. Were you driving a 5-speed or an auto?

A little OT, but my 6er just beat my friend's 1990 RX-7 turbo from 35-65 the other night, and hes got 185rwhp and only weights 2900lbs, with a 5speed. Mines an auto He was surprised, needless to say.

[Quadzilla]

It's becasue you git the gears ma'brotha! autos came witha 3.90 final drive... smokin' in 2nd.

[PasadenaE24]

Originally posted by Quadzilla
It's becasue you git the gears ma'brotha! autos came witha 3.90 final drive... smokin' in 2nd.

damn straight! Shark victims never see it coming

[00soul]

it was a auto.

[AngryDude]

what's the diff ratio of a manual 85 635csi? Anyone know of a good diff swap for faster 0-60 times?

[Quadzilla]

For just about all of the E12/24 run the gear sets ran like this:
<table border="1">
<tr>
<td><font color="#000080"><strong>BMW</strong></font></td>
<td><font color="#000080"><strong>original gear ratio</strong></font></td>
<td><font color="#000080"><strong>suggested ratio</strong></font></td>

</tr>
<tr>
<td><strong>630, 633 to 9/81 (side loader)</strong></td>
<td>3.45</td>
<td>3.64</td>
</tr>
<tr>

<td><strong>633 9/81-9/82 (side loader)</strong></td>
<td>3.25</td>
<td>3.64</td>
</tr>
<tr>
<td><strong>633 9/82-12/83</strong></td>
<td>3.25</td>

<td>3.64</td>
</tr>
<tr>
<td><strong>633 12/83&gt;</strong></td>
<td>3.25</td>
<td>3.64</td>
</tr>

<tr>
<td><strong>635 to 6/87 all</strong></td>
<td>3.46</td>
<td>3.73</td>
</tr>
<tr>
<td><strong>635 6/87&gt; 5-Speed</strong></td>

<td>3.64</td>
<td>3.91</td>
</tr>
<tr>
<td><strong>635 6/87&gt; Auto</strong></td>
<td>3.91</td>

<td>4.10</td>
</tr>
</table>

For all intents and purposes you could get away with saying that all 635 autos and M's got a 3.91 while the 5 speeds had the 3.64.

LSD was an option on the 635CSi and the L6 and standerd on the M6.

You can go pretty much as high or as llow with your final drive gearing if you can fine a machine shop willing to cut the gear set. It is highly advisable to enlist the help of a mechanical engineer to work out the bugs of a custom gear set.

[BMW_M3_PoWeR]

my dad has one of the first 635CSi's its a realli good car. BMW's are always SMOOOOTH! once one of my frends he was wit his grandparents he though he was goin 50 but he was goin 90.
thats how good BMW's are even the OLD ones