zredbaron Posted July 11, 2004 Share Posted July 11, 2004 hey guys...i was wondering if anyone has installed a knock sensor in an L28, if so...where? here is where I put mine... this is an old pic, but its where i installed the knock sensor. it doesn't seem to be doing its job. if my octane is less than ~97, i hear the detonation warning sounds under load. i am using the electromotive hpv-1 direct ignition setup. (and btw, i finally get my sunbelt head this week ) Quote Link to comment Share on other sites More sharing options...
Doug71zt Posted July 11, 2004 Share Posted July 11, 2004 The stock location on the F54 block L28et is on the passenger side, quite high on the block between cyl 4 and 5. I run a GM knock sensor with my SDS, but I am going to change to the stock nissan sensor when I change the engine. The GM sensor has a different tuning, and is picking up noise (Valvetrain?)and backing off the timing. I have it set so low in sensitivity that it is pretty much shut off. Can you adjust the sensitivity of your knock sensing on the HPV1? I think that a higher mount would likely work better for you. Closer to the source of vibration. As with you, I know when I get a bad tank of gas. I just back off the timing a couple of degrees under boost until the next fill-up. SDS is nice that way for quick adjustments. Doug Quote Link to comment Share on other sites More sharing options...
zredbaron Posted July 11, 2004 Author Share Posted July 11, 2004 thanks for the info... so....are you telling me i should mount it where the heater hose mount is in this picture? Quote Link to comment Share on other sites More sharing options...
Doug71zt Posted July 11, 2004 Share Posted July 11, 2004 Yes - on the F54 block, it is right close to that area. I don't have a picture handy. Doug Quote Link to comment Share on other sites More sharing options...
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