BMW E21 Harnesses
E21 Chassis Years and Models included (But not limited to):
The original engines from the chassis listed above include the M10 and M20
*If you are planning on using an automatic transmission, please send us a message.
LIFETIME Warranty with all harnesses!
This warranty only extends to the original purchaser and is limited to workmanship only. If you have any problem with these, just send us a message and we will take care of it.
**If you plan to use a Z3, M Roadster, or M Coupe harness or chassis, please let us know.**
We provide harness adapters for all of the following engines:
- S50 (US and Euro)
- M52 (Single vanos)
- M52TU (Double Vanos)
- S54 (US and Euro)
- M60 or M62 (obd1)
- M62TU (obd2)
We have our own complete diagrams for each of these motors and chassis. We have spent our own time figuring these setups out. For the newer M52TU, M54, S54, M62TU, and S62 motors, we used the E39 and E46 ETM which is available online or in book form for these diagrams. Therefore the E46 or E39 harnesses are desired. The standard S54 harness can reach the original ECU location in the glovebox on the E30. I will provide a link on the instruction sheet to assist you and possibly make it work the same for the E21.
All fuses and relays are included with all harnesses. With an exception of the USA Timed EKP modul fuel pump relay for the S54 and S62 harness.
All harnesses have been measured out for LHD vehicles and placing the DME in the glovebox compartment. RHD is available upon request.
The M52TU, M54, and S54 come standard for the E46 engine harness, please let us know if you plan to use another option. (Z3M, E39, X5,etc.)
The M62TU and S62 come standard for the E39/M5 engine harness, please let us know if you plan to use another option.
Detailed instructions are included with all harnesses
EWS must be deleted.
We now offer the M52TU, M54 (B22, B25, and B30), S54, and S62 EWS deletes (Free, with a purchase of an adapter harness). Just send us your ECU to be modified.
**$70 value without a purchase of a harness.
We will assist as much as we can throughout your entire engine swap.
These can all be customized to order. Please let us know if you have any special requests.