Quote:
Originally Posted by Croustibat
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)
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.
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.
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Are you still trying to convince him there are indeed knock maps for timing and fuel? Forget about it! It's harder to relearn people than a Nissan ecu! That goes for "fine tuning" with a safc as well!
Tuning the k and latency is easy, but that's not where the power comes from. I can confirm that an un-tuned Sr can make 350hp from a 2871r @ 17psi with just a mafs and an injector upgrade. Still people are like, this tuner tuned my blah blah and I make 350hp at 20psi.
And yes I've tweaked a few of enthalpy tunes, they are usually conservative from my experience and can benefit from dyno time if you want more power. Not everyone needs more power or to conserve gas though, so if you just need your engine to run correctly you're good to go!
Sent from my Highly Tuned Note 4.5!!!