PE Tuning... how much to change?
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TECH Enthusiast
Joined: Mar 2003
Posts: 618
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From: San Diego
PE Tuning... how much to change? I dynod my car today, everything went smoothly, two runs 'exactly' the same, can't even tell the lines apart. Everything went well, except the car is running rich WOT.
My A/F ratio was 12.5/12.6 2200-3800, down to 12.3@ 4000, down to 12.1@4800, and 11.9-12.0 from 5000-6400.
I would like to get it to around 12.9-13.0 from 4k up, should I use the PE table to adjust for this or try something with the MAF to cut fuel slightly at higher rpm?
If I adjust the PE table, should I just play with .001 or .01 increments?
Right now my (stock) PE table is 1.250 to 2400rpms, and 1.252 2800 +
I'll hopefully be able to rent some dyno time next weekend. The car only dynod 357/354 (cam, jba headers, orp, cutout, ls6 intake, pulley)
Thanks for any suggestions
My A/F ratio was 12.5/12.6 2200-3800, down to 12.3@ 4000, down to 12.1@4800, and 11.9-12.0 from 5000-6400.
I would like to get it to around 12.9-13.0 from 4k up, should I use the PE table to adjust for this or try something with the MAF to cut fuel slightly at higher rpm?
If I adjust the PE table, should I just play with .001 or .01 increments?
Right now my (stock) PE table is 1.250 to 2400rpms, and 1.252 2800 +
I'll hopefully be able to rent some dyno time next weekend. The car only dynod 357/354 (cam, jba headers, orp, cutout, ls6 intake, pulley)
Thanks for any suggestions
use the pe table- i wouldn't bother with the maf table. if you are at 1.25, try 1.23 or 1.22 (you will see very insignifigant changes if you only change .01 at a time). tu put it into perspective, the pe is in %, like if it is at 1.25 then you are adding 25% over amount of fuel already there, so you are now going to see how adding 23% works. fwiw adding/subtracting .001 doesn't do ****-
granted all cars are different but my car was pretty good (13.0a/f) at around 1.20- 1.18 up top. my car is mostly stock though
granted all cars are different but my car was pretty good (13.0a/f) at around 1.20- 1.18 up top. my car is mostly stock though
