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B14s work a little different. In a B13 ecu the fuel map is a multiplier of the calculated TP (where TP is the theoretical pulsewidth needed for 14.7:1 AFR). The 8th bit (hence 'big' numbers) indicated closedloop operation. For B14s the fuel map is directly in target AFR, where 128 is 14.7:1. You can translate the fuel map by (#/128) * 14.7 = target AFR. Where the ecu switches from closed to open loop is no longer set in the fuel map. I suspect careful reading of the FSM might offer some information on that point (its amazing what Nissan puts in the FSM, you just have to read carefully, there are descriptions of the stock fuel and timing maps in the FSM).
Whats neat is you've got some maps you can start comparing to see how everything works. Dig up the '94 rom I've posted somewhere, and compare that to a '93 rom. That gives an almost direct comparison on what a fuel map looks like in a B14-style ecu vs the oldB13/S13. Then find a S14/S15DET rom and check that out, it should give you an excellent turbo fuel map to start with. All you have to do is set your k-number and injector latency correctly. Btw, latency I think is the exact same, but obviously the k-numbers are way different, that you just have to tune to find.
Last edited by Calum; 09-05-2006 at 06:08 PM.
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