Difference between revisions of "Drivetrain"
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![[316]] [[316i]] [[318i]] | ![[316]] [[316i]] [[318i]] | ||
[[320i]] [[324d]] | [[320i]] [[324d]] | ||
| + | ![[318iS]] | ||
![[323i]] Sport | ![[323i]] Sport | ||
| − | |||
![[323i]] [[324td]] [[325e]] | ![[323i]] [[324td]] [[325e]] | ||
[[325i]] [[325iX]] | [[325i]] [[325iX]] | ||
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!1st | !1st | ||
|3.76 | |3.76 | ||
| + | |3.72 | ||
|3.72 | |3.72 | ||
|3.76 | |3.76 | ||
| − | |||
|3.83 | |3.83 | ||
|3.72 | |3.72 | ||
| Line 53: | Line 53: | ||
!2nd | !2nd | ||
|2.04 | |2.04 | ||
| + | |2.02 | ||
|2.02 | |2.02 | ||
|2.33 | |2.33 | ||
| − | |||
|2.20 | |2.20 | ||
|2.02 | |2.02 | ||
| Line 68: | Line 68: | ||
|- | |- | ||
!4th | !4th | ||
| + | |1.00 | ||
|1.00 | |1.00 | ||
|1.00 | |1.00 | ||
|1.23 | |1.23 | ||
| − | |||
|1.00 | |1.00 | ||
|1.00 | |1.00 | ||
| Line 78: | Line 78: | ||
| | | | ||
|0.81 | |0.81 | ||
| + | |0.80 | ||
|1.00 | |1.00 | ||
| − | |||
|0.81 | |0.81 | ||
|0.80 | |0.80 | ||
| Line 86: | Line 86: | ||
|4.10 | |4.10 | ||
|3.45 | |3.45 | ||
| + | |3.71 | ||
|4.10 | |4.10 | ||
| − | |||
|3.46 | |3.46 | ||
|3.46 | |3.46 | ||
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!Getrag 242 | !Getrag 242 | ||
!Getrag 240 or 242/5 | !Getrag 240 or 242/5 | ||
| + | !Getrag 240 | ||
!Getrag 245 | !Getrag 245 | ||
| − | ! | + | !Getrag 260 |
!Getrag 260/5 | !Getrag 260/5 | ||
|- | |- | ||
Revision as of 18:41, 19 November 2011
It's great that your engine produces all that lovely power, but getting it to the Wheels is a serious matter. To make the bridge between them, you need to understand the Drivetrain.
Contents
Overview
The gearbox, propshaft and differential make up the drivetrain. To get power to the gearbox, the clutch presses itself up hard against the flywheel of the engine.
Clutch
Plate
Master Cylinder
Slave Cylinder
Gearbox
Gearbox ratios are also dependent on the ratio of your diff. For example, a high ratio diff (4.27) combined with a high-ratio first gear (3.72) will make first gear useless. In contrast, a low-ratio diff (3.25) with a low-ratio gearbox (2.48 in first)
The E30 was available as both a Manual and an Automatic. In total, eight different gearboxes were fitted to the E30; five manuals, all produced by Getrag, and three automatics by ZF.
Manual
A range of gearboxes were used in the E30.
| Four-Speed | Five-Speed | |||||
|---|---|---|---|---|---|---|
| 316 | 316 316i 318i | 318iS | 323i Sport | 323i 324td 325e | 325i Sport | |
| 1st | 3.76 | 3.72 | 3.72 | 3.76 | 3.83 | 3.72 |
| 2nd | 2.04 | 2.02 | 2.02 | 2.33 | 2.20 | 2.02 |
| 3rd | 1.32 | 1.32 | 1.61 | 1.32 | 1.40 | 1.32 |
| 4th | 1.00 | 1.00 | 1.00 | 1.23 | 1.00 | 1.00 |
| 5th | 0.81 | 0.80 | 1.00 | 0.81 | 0.80 | |
| Reverse | 4.10 | 3.45 | 3.71 | 4.10 | 3.46 | 3.46 |
| Getrag 242 | Getrag 240 or 242/5 | Getrag 240 | Getrag 245 | Getrag 260 | Getrag 260/5 | |
The M42 engine mates up to the same gearbox used in M40 engines, but is not campatible with earlier M10 gearboxes due to the angle of installation, which will cause problems with the shifter and rear gearbox mount.
Notice the similar ratios between the Getrag 240 and the Getrag 260/5. This means that for those replacing their M20B20 engine with the more powerful M20B25, Sports performance can be achieving by keeping the original gearbox.
However, don't let parts sellers convince you that the boxes are identical. Getrag gearboxes can be identified by looking for the serial number stamped around the edge of the bell housing. This number should also contain letters, which will identify the following boxes:
- Getrag 240 - MN or BMV
- Getrag 242 - LF, MD or BMU
- Getrag 242/5 - AY, AW or LG
- Getrag 245 - BJ
- Getrag 260 - NW, ANB or TNW
- Getrag 260/5 - TNN or HM
Automatic
| Three-Speed | Four-Speed | ||
|---|---|---|---|
| 316 318i | 320i 323i | 325i | |
| 1st | 2.48 | 2.73 | 2.48 |
| 2nd | 1.48 | 1.56 | 1.48 |
| 3rd | 1.00 | 1.00 | 1.00 |
| 4th | 0.73 | 0.73 | |
| Reverse | 2.09 | 2.09 | 2.09 |
| ZF 3 HP 22 | ZF 4 HP 22 | ||
Selector
Propshaft
Guibo
Bearing
Differential
Main article: Differentials
Output Flanges
Drive Shafts
Common Upgrades
A Z3 short shift conversion will help you change gears quicker.
