got this info of wikipedia
Regular 2.7 Eta based
This is one option that many have discredited over the years but has been proven to work quite well. Simply find a 2.7L ETA engine and swap on the complete head off of a 325i. This is all that is needed for the engine. The result is 8.3:1 compression which is on the low end for a NA motor but is perfect for a turbo car. In fact, cars with this setup have made over 400 rwhp with the stock ETA bottom end.
If you are starting with a eta equipped car, this will require an upgrade to Motronic 1.1/1.3 from a 325i in order to get the desired revs and fuel/spark mapping. This will require the use of the entire engine harness, ECM, front crank pulley with crank sensor and bracket, all the sensors (including AFM), injectors (Etas built before September 1987 with the older Motronic system use low-impedance injectors, wereas the 325i computer must use high-impedance injectors) , also 325i plug wires and the EVAP purge solenoid. An instrument cluster with the 7000 rpm tachometer and a small wiring modification to make the tach work will also be necessary. Owners of Etas made before December 1986 will need to widen the hole where the engine wiring harness goes into the car. Owners of older Etas that have a rectangular plug joining the engine harness to the fuse box instead of a round one will have to change to the later model fuse box or splice all the wires and make a custom connection.
Regular 2.7 Eta based
This is one option that many have discredited over the years but has been proven to work quite well. Simply find a 2.7L ETA engine and swap on the complete head off of a 325i. This is all that is needed for the engine. The result is 8.3:1 compression which is on the low end for a NA motor but is perfect for a turbo car. In fact, cars with this setup have made over 400 rwhp with the stock ETA bottom end.
If you are starting with a eta equipped car, this will require an upgrade to Motronic 1.1/1.3 from a 325i in order to get the desired revs and fuel/spark mapping. This will require the use of the entire engine harness, ECM, front crank pulley with crank sensor and bracket, all the sensors (including AFM), injectors (Etas built before September 1987 with the older Motronic system use low-impedance injectors, wereas the 325i computer must use high-impedance injectors) , also 325i plug wires and the EVAP purge solenoid. An instrument cluster with the 7000 rpm tachometer and a small wiring modification to make the tach work will also be necessary. Owners of Etas made before December 1986 will need to widen the hole where the engine wiring harness goes into the car. Owners of older Etas that have a rectangular plug joining the engine harness to the fuse box instead of a round one will have to change to the later model fuse box or splice all the wires and make a custom connection.
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