How to safely add more timing to this map? (tuning timing vs. fuel)
#1
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How to safely add more timing to this map? (tuning timing vs. fuel)
Heard more knock on the way home from SLO tonight. I've been struggling with it for a couple of weeks now, slowly pulling more and more and more timing until I didn't hear it, and adding fuel in a couple of places as well. I thought I had it all, but I saw the oil pressure gauge wiggle back and forth in 3rd gear at around 5700rpm, so I went and added a bunch of fuel to that area and it seemed to flatten it out. I still have a tiny bit in the 4600 range, so I'll have to go back out tomorrow and see if I can't get some more fuel into that area too. I'm below 11.8 everywhere on my wideband, as low as 11.3 in the 5700rpm range. The timing map is really conservative too, even for ****-water 91 octane.
Any suggestions? I don't think the timing should have to be that conservative. Once I have a bit of spare cash, I'm going to rent some dyno time and get the spark map hashed out, but that's not going to be for a couple of months. I know there's no other proper way to do spark.
Anyone have a 1.8/GT2554R/91octane spark map they'd be willing to share for me to fiddle with?
Any suggestions? I don't think the timing should have to be that conservative. Once I have a bit of spare cash, I'm going to rent some dyno time and get the spark map hashed out, but that's not going to be for a couple of months. I know there's no other proper way to do spark.
Anyone have a 1.8/GT2554R/91octane spark map they'd be willing to share for me to fiddle with?
#2
I would only mess with spark on the dyno. I know this from experience with my last motor . What are your IATs up at max boost? That pressure ratio is at the point that is getting outside the efficiency of that turbo. I think that could probably account for some of the reason that timing needs to be pulled. Its getting to the point where its just blowing hot air.
#3
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112° on track at Buttonwillow, running 100 octane with a bit more advance in the upper boost ranges. I have done nothing but remove spark since I started fiddling. During tonight's tuning runs, max IAT of 73. Max boost is just over 15psi.
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The early miatas use carbon resistance sensors to monitor oil pressure. Knock screws with the sensor's ability to work, and causes the OPG needle to oscillate.
"Siegel" eh?
#12
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09-05-2015 08:02 AM