Quote:
Originally Posted by smelly240
The s13 sr ecu requires a knock sensor failure to enter the knock maps. You cannot enter the knock maps without some sort of sensor failure... even having 2 spun rod bearings we couldnt get one to switch over - even tried a brand new sensor. So pretty much - without destroying or unplugging the knock sensor - YOU ARE NOT ON THE KNOCK MAPS.
Nissans also ignore knock sensor inputs after around 4000rpm - they understand that the units are unreliable at distinguishing between normal engine noise and knock.. Even the best new ecu has difficulty with this.
The new and better way to monitor knock is all done through monitoring the coil activity after the spark... pretty much it has a oscope that watches fluctuations after the cylinder fires. No more crappy piezoelectric microphone BS.
you can disable the stock o2 sensor and the car will make the same power - at WOT o2 feedback is disabled... Army is correct on this - however fuel economy is not the reason for this sensor - emissions is. MOST cars are set up LEANER than stoich without o2 feedback - so technically the o2 sensor feedback will fatten the car up and use more fuel.
11psi - this has been covered for years...
Stock S13's get extremely rich up top - like 9.9-10.2 when they're stock @ 11-12psi. they're good up until about 5000rpm and then the AFRs will just hit the floor. also - they come with remarkably conservative timing maps.
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The stock S13 SR timing map is stupid conservative in the midrange, then gets super aggressive at higher RPM. This is even more of a problem if you put something like a T28 that can flow more air than the T25.
Run the T25 at 14 psi - they last for quite a while like that, but the boost drops off towards redline and the car feels like it's got kinda lame top end as a result. If you swap to a T28 or bigger, don't run over 11 psi on stock injectors/MAF - it maxes the MAF out and it WILL run lean with more boost.