This harness is specifically engineered for a BMW E30 (1982-1993) with the S15 SR20DET engine swap. It was developed in house on an actual S15 SR20DET engine in an E30 chassis to ensure a perfect fit to all engine connections. 

NOTE for 1982-1986 E30 Models  

  • Due to the existing OEM chassis harness wiring age & it being inadequate to support a modern EFI system properly, 82-86 E30 orders will receive a self-contained version of the harness which utilizes a 5-relay Bussmann fuse block to integrate with ignition, fuel pump, two cooling fans and Auxiliary relays.
  • You will need to manually connect a handful of wires for speedo, tach, coolant temp, oil pressure warning light, alternator warning light etc. These can be connected into the OEM body connector or wired directly to individual sensors & gauges.
  • This option provides the best results in ensuring the more modern EFI system is not negatively affected by the existing chassis wiring in the E30.  A Factory Service Manual or other wiring diagrams will be required.  

ENGINE: S15 SR20DET

  • Any SR20DET RWD from JDM S15 Silvia 1999-2002

CHASSIS: E30 BMW

  • Any E30 BMW manufactured in 1982-1993
  • Factory Speedometer remains functional with BWM differential.
  • Factory Tachometer remains functional unless number of cylinders changes. Use Dakota Digital SGi-5 if the number of cylinders has changed from factory.
  • Alternator Warning light, A/C, wipers and reverse lights remain functional.
  • Optional Factory Gauge Sensor Adapters retain the factory BMW Oil Pressure and Coolant Temp cluster functionality. The adapters are also machined to support most aftermarket temperature and pressure gauges that require a 1/8"-27 thread pitch. Will require the use of E30 BMW (Original BMW sensors) Oil and Temp sensors (1-wire).

PRO-SERIES HARNESS TECHNICAL SPECS

  • Plug and Play – simple and efficient
  • NO CORE HARNESS or additional wiring required
  • OEM wire colors used, where applicable
  • Fireproof fiberglass sleeving used in high-temp sections near the manifold & turbo (-40°C/-40°F to +450°C/+845°F operating temperature)
  • Point-to-Point continuity tested on every wire
  • Constructed using exact OEM connectors and seals
  • Made with high temp TXL wire with adhesive shrink tubing (-40°C/-40°F to +125°C/+257°F operating temperature)
  • Wrapped in lightweight nylon loom (-94°C/-137°F to +125°C/+257°F operating temperature)
  • Includes a charge harness and improved grounds
  • Fully tested after production for an easy plug-and-play installation

PRO-SERIES HARNESS INCLUDES

  • Main Engine and Transmission one-piece tucked harness
  • Alternator charge cable
  • Knock sensor connector
  • MAFS connector (OEM or Upgraded)
  • VTC connector (for S14 and S15 models)
  • Boost solenoid connector
  • TPS Connector
  • 4x Injector connections
  • CAM sensor connector
  • 4-pin and 5-pin ignitor chip connectors
  • OEM Oxygen sensor connector (wideband wiring is not part of the EFI harness and needs to be supplied)
  • Ground ring terminal
  • Idle control/fast idle connectors
  • Engine coolant sensor and gauge coolant temp switch
  • Reverse sensor connector
  • Speed sensor connector (Both S13 and S14 connectors are supplied)
  • Alternator connector
  • Starter signal connector
  • OEM oil pressure 1-pin connector (only 1-pin version supplied)
  • Nissan Diagnostics connector
  • Dash and fuse box connections through the Interface harness
  • Printable install instructions with pictures
  • Turn Key ENGINE START Guarantee

Return Policy

 

All items are subject to a 20% restocking fee on all returnable items within the 14 days of the purchasing date depending on their condition when returned.

If you placed an order and received free shipping but returned an item and you no longer qualify for the free shipping, you, the buyer, are responsible for paying the original cost of shipping and the return shipping cost..

What is a reasonable restocking fee? It is the percentage of the item’s price depending on type of item and condition when it is returned. Our restocking fee is 20%.

Type of Return Request

Restocking Fee Applied?

Buyers changes mind, buyer remorse or price difference

Yes

Buyer refuses delivery

Yes

Buyer returns an item but it arrives to the seller damaged, defective or materially different than what was originally shipped by the seller

Yes

Buyer receives an item materially different from what they ordered

No

Order is returned as undeliverable

No but an amount equivalent to the return shipping costs will be deducted

Items arrive to the buyer damaged or defective

No

Buyer refuses delivery due to visible damage incurred during shipping or caused by the carrier

No