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| Message: | Found a euro e30 320i eco to fit the volumetric efficiency curve of the euro e30 320i cylinder head I'm using. Runs smoother all through the rpm range, better response everywhere, no more lull right after 3k before it comes on cam, better power over 5k right up into the rev limiter with no noticeable drop in torque after peak power. And thats with the stock 320i chip. That and the 3.73 diff added a good deal more hop. Tossed the m30 AFM because of small glitches in driveability. I noticed that the 325i AFM and 325e AFM are sprung differently. The e cars had basic motronic. This means that the output voltage of the AFM increased relative to the airflow. For later systems, such as the motronic 1.1/1.3 in the 325i, the output voltage varied according to the flap angle. My AFM, apparently, came from an e30 m3. Those are equipped with basic motronic, and the AFM's are sprung accordingly. This caused problems with lean surging at lower rpm, a stutter when the throttle was suddenly hit at any rpm, and problems with the idle. This swap will only work if you use a 535i AFM. The 533 and e30 m3 afms will not work right. You can tune them by changing the spring tension to work right at low, medium or high rpms, but there will always be a problem somewhere. The 325i peice isnt bad anyway. The 3.73 diff added some more pull at WOT, but the most noticeable difference is in roll on response. In any gear, at any speed, it'll pull. At 100 in 5th, it'll pull. At 40 in 4th it'll pull. I would go for a 3.91 or 4.11 if I can find one for cheap, but it'll do for now. More news coming when I get a euro 320i chip on de german ebay. -  Daniel Leahy '85 528e- e30 323i head, 325i cam, polished outside/ported inside intake manifold, 535 injectors, I.E. shorty headers, e30 320i ecu plug'd into 325i fuel injection, 3.73 diff. 341k on chassis, 5k on motor. '83 528e- Auto trans, new paint and interior. 325i cam, still dog-slow. 175k. '88 US spec M6- Not mine, still pimpalicious. 140k | ||||
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