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Originally Posted by KAT-PWR
Prob disabled the knock sensor. After changing 4 knock sensors and 3 sub harnesses I told martin to just rid me of that shit. Had no issues for a year, then he came and tuned me on the dyno without it.
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Interested in how he did that. I always heard you need a 500 to 1Kohm resistor on the cable that goes to the ECU, so he probably soldered that in the ECU. But i never did it on a nissan engine.
Tried it on a toyota ecu but it didn't work ( the work differently, it is a pain)
Quote:
Originally Posted by spooled240
I think you might be confusing the functionality of the knock sensor on reflashed ecu's. I wouldn't doubt that those might have additional fuel maps and features should the knock sensor encounter any issues.
I'm not completely ruling out the possibility that Nissan designed the stock ecu's with two fuel/timing maps, but I just have a hard time believing that they wouldn't have mentioned it in the FSM. Case in fact: My engine was producing devastating knock on boost which ended up cracking ring lands on #4 and there was no apparent change in the driveability. Even JimWolf himself told me that the knock sensor is there to retard timing under light loads and was mostly used to "protect" (although very minimal) the engine from bad gas, etc.
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I am not confusing anything. Until the feature pack 1, a nistune was just modifying OEM data stored in an eprom in the ECU. The FP1 actually modifies the code and removes the knock maps to make some room for the flexfuel system.
The FSM is a manual for stores, not for reverse engineering enthusiasts, that is why the info is not in.
I believe nistune makes a demo version of its software, it is very crippled and unusable to tune, but you can test the UI on it and see for yourself. You can also check the address files, they are provided in the "rom pack" . You will see there is a knock fuel map and a knock timing map. If it sill is not enough, i think i have the code somewhere for a ca18det (lower level is different from sr20 but it works the same way. It is also easier to understand as it actually was written in asm on the first versions, not compiled as it is on the 44F ECUs). It is a 6802 MCU, which is a very old and simple µcontroler, so it has very few instructions.
Quote:
Originally Posted by NickS14
U, but I may get an SAFC II to fine tune.
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Seriously don't do that. It is the nastiest piece of crap you can fit on a MAF system.
I don't understand why so many people want one. That thing changes the MAF signal, and your ECU relies on this to set fuel AND timing .
Tuning the K and latency values is a 30mn work, and it does not requires a dyno, just a wideband AFR sensor.