ZR-1 Net Registry Forums - View Single Post - Tuning larger LT-5 cams

XfireZ51 · 06-24-2011

Ron,
Is there any chance you could do a run thru the emissions test while datalogging the run with a scantool? Just making some "uneducated" guesses based on my experience with my modded Xfire, I would try:

1. Hotter spark plug
2. Activate Decel Fuel Cut-Off
3. Raise the TPS% for secondaries so you are running only
primary injectors for the emissions cycle.
4. Bump timing
5. Lean out Acceleration Enrichment pump shot
6. Increase the AE Coefficient slowing down pump shot
response to throttle changes.

You'll need to make certain you don't
go into Lean Misfire. My initial thought is that the HC spikes during acceleration/decel which makes up a significant portion if the test. Not to mention the "tech" driving the car.

06-24-2011	#25
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,686	Re: Tuning larger LT-5 cams Ron, Is there any chance you could do a run thru the emissions test while datalogging the run with a scantool? Just making some "uneducated" guesses based on my experience with my modded Xfire, I would try: 1. Hotter spark plug 2. Activate Decel Fuel Cut-Off 3. Raise the TPS% for secondaries so you are running only primary injectors for the emissions cycle. 4. Bump timing 5. Lean out Acceleration Enrichment pump shot 6. Increase the AE Coefficient slowing down pump shot response to throttle changes. You'll need to make certain you don't go into Lean Misfire. My initial thought is that the HC spikes during acceleration/decel which makes up a significant portion if the test. Not to mention the "tech" driving the car.