Quote:
Originally Posted by XfireZ51
Mike,
R U saying you cut back AE on the <2K range or in the 3800-4500rpm range?
The LT-5 uses a Speed Density system, so I guess it is MAP sensitive. The calibration you had may have been fatter in the higher kPa range since the motor would be operating there more often in Phoenix. Drier air too. Moving to SoCal, the VE could have been a bit lean in the lower VE range.
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yeah, I cut back or totally zero'd AE in the range which I believe the CA state inspection system runs their IM-240 equivalent (4 minute dyno test- really it's about a minute nowadays). That's all below 2000 rpm mostly at light loads. This also tends to keep the mixture leaner during light cruise which should help with economy and Cat lifespan.
Then I reduced/smoothed out the timing in the range it pinged and where I believe the load points to be KPa wise. I didn't take a lot out
the only mods I have done since was to go to a 2.5" Corsa from a 3" B&B I traded and it 0-60's ever so slightly quicker, but I haven't re-dyno'ed it or anything. I doubt it would be leaner- but that's really a guess.
I will probably be buying an emulator gizmo soon because I want to datalog or at least hit trace a few maps just to be sure where it really operates in certain modes.