timing retard?
01-04-2002, 07:53 AM
#2
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Re: timing retard? i just answered this question on another board so here goes:
in order to remove timing, you can 'trick' your computer by changing the resistance value of your IAT sensor to make the intake air seem warmer than it really is.
here's some approx values during normal operation:
5.2k~92F
5.1k~85F
5.0k~78F
4.9k~71F and so on.
for every 100ohms you move 7 degrees. so, if you want to make the air charge seem warmer, add resistance in series with the circuit. a 1k (1000) ohm resistor added will add 70F to actual reading. this will pull out ~4 degrees timing. if you ever decide you want to add timing (if your Autotap or Ease Scan tells you your shy on timing) you'd have to use Ohms law to add resistance in parallel to lower the overall resistance:
R1*R2/(R1+R2)
so, if you want the IAT to be 4.8k but it is at 5.1k, we'd need to add a 81.6k resistor in parallel.
remember, we make the most power when we run as lean as possible with as much timing as possible without going into detonation. this is where the maxim 'lean and mean' comes from. but because we want to err on the side of safety for the sake of our motors, we sacrifice some power by ensuring a little rich and little less timing to avoid knock. hope this helps. oh, almost forgot, a 1/4 watt should be fine in this circuit.
in order to remove timing, you can 'trick' your computer by changing the resistance value of your IAT sensor to make the intake air seem warmer than it really is.
here's some approx values during normal operation:
5.2k~92F
5.1k~85F
5.0k~78F
4.9k~71F and so on.
for every 100ohms you move 7 degrees. so, if you want to make the air charge seem warmer, add resistance in series with the circuit. a 1k (1000) ohm resistor added will add 70F to actual reading. this will pull out ~4 degrees timing. if you ever decide you want to add timing (if your Autotap or Ease Scan tells you your shy on timing) you'd have to use Ohms law to add resistance in parallel to lower the overall resistance:
R1*R2/(R1+R2)
so, if you want the IAT to be 4.8k but it is at 5.1k, we'd need to add a 81.6k resistor in parallel.
remember, we make the most power when we run as lean as possible with as much timing as possible without going into detonation. this is where the maxim 'lean and mean' comes from. but because we want to err on the side of safety for the sake of our motors, we sacrifice some power by ensuring a little rich and little less timing to avoid knock. hope this helps. oh, almost forgot, a 1/4 watt should be fine in this circuit.
01-04-2002, 03:23 PM
#3
Re: timing retard? NitrousC5, that is some GREAT info you have there, and we really appreciate you sharing it on the site. However, we ask that our members try and keep their sig somewhat abbreviated, so if you could shorten it down a little, we would appreciate it. Thanks and welcome to the site! <img src="gr_stretch.gif" border="0">
Josh
Josh