Fuel or Spark to rid your self of that last bit of KR
06-14-2006, 12:34 PM
#1
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Thread Starter
Fuel or Spark to rid your self of that last bit of KR Just a little bit of mindless meandering...
If you had just a little bit of KR ... say 0.1 to 0.6 in your mid to upper RPMs ... and wanted to tune that last little bit out, which way would you go?
Would you add a tad more fuel, or drop timing by that much?
In your opinion, which robs the most power?
If you had just a little bit of KR ... say 0.1 to 0.6 in your mid to upper RPMs ... and wanted to tune that last little bit out, which way would you go?
Would you add a tad more fuel, or drop timing by that much?
In your opinion, which robs the most power?
06-14-2006, 12:55 PM
#2
Pull timing, you really don't want to use fuel to cover that up. Safety. 
Of course make sure it is real knock by putting in some good gas and making sure it goes away. Seen a few blower cars that just seem to pick up some wacky noise from the head unit through the head or something and interpret it as KR.
Of course make sure it is real knock by putting in some good gas and making sure it goes away. Seen a few blower cars that just seem to pick up some wacky noise from the head unit through the head or something and interpret it as KR.
06-14-2006, 01:21 PM
#3
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Thread Starter
Originally Posted by NicD
Of course make sure it is real knock by putting in some good gas and making sure it goes away. Seen a few blower cars that just seem to pick up some wacky noise from the head unit through the head or something and interpret it as KR.
Originally Posted by NicD
Pull timing, you really don't want to use fuel to cover that up.
It's always been some combination of fuel and Spark tuning that eliminated detonation, right?
Originally Posted by NicD
Safety.
Thanks for your reply ... I just need clarification on some of your thoughts.
Does anyone know whether richer mixture or decreased spark has the most "loss of power" effect?
06-14-2006, 01:47 PM
#4
haha, yea 98s in general.
I have always looked at detonation as the result of too much timing in general. So in that respect I always just pull timing as long as the fuel isn't too lean or anything like that. Basically you shouldn't have to run 10.5:1 a/f to keep knock retard at bay, if your fueling is around a mid-high 11 a/f then IMO if you have knock retard you should pull timing and not just add fuel.
I have always looked at detonation as the result of too much timing in general. So in that respect I always just pull timing as long as the fuel isn't too lean or anything like that. Basically you shouldn't have to run 10.5:1 a/f to keep knock retard at bay, if your fueling is around a mid-high 11 a/f then IMO if you have knock retard you should pull timing and not just add fuel.
Last edited by NicD; 06-14-2006 at 03:30 PM.
