Quote:
Originally Posted by mike100
I took a little timing out of my Haibeck calibration right around 3800-4500 rpm in the middle Kpa map ranges. I used the tuner pro smoothing function to ramp the values. I left the 2000 and under range completely stock VE and spark etc for emissions testing and catalyst lifespan. I also cut back on AE in that range as well.
It still makes power at full throttle past 5000 rpm, just the 91 octane and 90 deg weather at dead sea level didn't work with the generic tune (not knocking Haibeck at all- pun intended), but nobody can possibly tune for all elevations and fuel blends across the country. The off-the-shelf tune did work well in Phoenix (1100 ft elevation) in 90 deg spring time temps- go figure- I think the LT5 is Kpa/ map sensitive, especially since 92 octane was the norm 20 years ago.
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Just a point of reference, AMSL for Chicago & most of the surrounding area is 600 feet - but the 93 octane is commonly available- even higher near the drag strip. So, if knock with 91 was present in your case, the altitude doesn't strike me as a contributor- might just be the octane?? (Cam timing comes to mind as well...)
No point, just musing out loud!
