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Hi Russell, I have another general question about running different boost levels and your chip selector ... You've all ready touched on running a little past the chip selector levels (15-18 psi selector is ok for slightly more than 18 psi), but what if I would want to turn boost down with these chips, to say 10-12 psi for if wifey wants to drive it to work for a week? Still safe? Side effects (run rich, or non-optimumly in some other fashion)? Thanks!
Perfectly safe, not fully optimum. If wifey is driving around town and not putting her foot to the floor then she's in the partial throttle fuel/timing maps which are load based, so A/F will stay the same regardless of maximum boost settings. If you think she's going to be taunted by somebody else's wifey in their bimmer to put her foot in it, she's still okay. But if you have an adjustable fuel pressure regulator you could dial it back to 40psi (~2.75 bar) and the A/F would be near perfect at 11-12psi even if your chips are mapped for 19+ boost. The boost selection is aimed at the boost you will run 'most of the time', but it doesn't confine you to those boost levels. How your boost goal effects the mapping depends on other factors as well, such as injector size, turbo size, etc... One variable on the chip selector doesn't always make a significant difference in the mapping. A combination of variables plays into the overall mapping procedure.
10-15-2006, 10:49 PM
