First Log on my Evo IX
What the hell was 
thinking tuning the car like this.
If you set it to 2500, you make the start/end rpm the same, basically turning off lean-spool.
Like I said, it's a quick and dirty way of doing it.
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There may be more to it than that too. Some of the lean spool parameter tables suggest that under certain load conditions, the lean spool program may be active and causing some change to the AFR even before the "lean spool start RPM".
I actually tell people this all the time. I have seen dozens of instances where guys with very little experience, get irate at tuners after they log their own cars some time after a tune, and see knock.
Its unavoidable to get some small amount of knock, large amounts that affect the tune are where you have to be really concerned.
But even getting 0 counts on the dyno, doesn't mean its knock free while driving, I think thats where the huge misconception came from.
Its unavoidable to get some small amount of knock, large amounts that affect the tune are where you have to be really concerned.
But even getting 0 counts on the dyno, doesn't mean its knock free while driving, I think thats where the huge misconception came from.
congrats again on the ix nj!
Last edited by ST; May 31, 2007 at 05:22 PM.
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If you mean about a few knocks being unavoidable, its because its true. The Evo knock detection system is super sensitive and cannot be completely isolated from other things that generate noise that is detected by the knock sensors.
When I first started logging data and tuning about eight months ago, I was really upset if I got any knock counts. I eventually realized with a safe tune, a few stray knock counts is just noise. Nowadays, I start paying attention when I see consistent knock counts at a particular rpm or if I see a spike greater than 3.
When I first started logging data and tuning about eight months ago, I was really upset if I got any knock counts. I eventually realized with a safe tune, a few stray knock counts is just noise. Nowadays, I start paying attention when I see consistent knock counts at a particular rpm or if I see a spike greater than 3.
I reconfigured the knock counter in EvoScan to read 0-15 instead of 0-50 like it starts out. I am with you though Mrfred, 1-3 counts lets you know how close a particular combo is to "the edge".
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Its those spikes where the knock sum goes from 0 to 5+ instantly that are indicators of real knock.
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Octane boost additive for trips to CA would be fine. Just make sure the booster actually works. Many of the brands have very little effect on octane.
