- Joined
- Aug 6, 2007
- Messages
- 444
- Reaction score
- 3
- Points
- 18
- Age
- 61
- Transmission
- Automatic
Although I've been running a blower on my truck for several years now, I'm ALWAYS concerned when I have to go through the semi-annual emissions test. When I first installed the supercharger, I had a lot of trouble because of bogging and stalling off idle. This was caused by the interplay of the mass airflow and O2 sensors. Many of you remember that this issue caused me to abandon the factory computer entirely.
This is my fourth year running Megasquirt. I still have some issues with afterstart enrichments and a rather annoying tendency for the truck to stall after it's first fired up, or after coming down a long downhill stretch, but everything else is running pretty well. I thought, perhaps that my tuning problems with the LC-1 might have toasted my catalytic converter, but I got through the emissions test with no problem this afternoon.
Here are my readings:
Hydrocarbons: .462 gm / km (max= .99)
CO: 8.5 gm / km (max = 12.43)
NOx: .996 g / km (max 1.55)
This illustrates that even after 230 000 km, a modified, non-dyno-tuned engine can easily pass a pretty strict emissions test. I've owned my truck for better than 10 years now, and even with the blower on it, the vehicle still burns pretty clean! (It's at least as good as it was with the factory computer and NO blower.)
There is NO need, then, to dump the catalytic converter, the EGR or any of the other emissions equipment. We can enjoy "higher performance" without compromising environmental quality any further than would be the case with a stock engine.
This is my fourth year running Megasquirt. I still have some issues with afterstart enrichments and a rather annoying tendency for the truck to stall after it's first fired up, or after coming down a long downhill stretch, but everything else is running pretty well. I thought, perhaps that my tuning problems with the LC-1 might have toasted my catalytic converter, but I got through the emissions test with no problem this afternoon.
Here are my readings:
Hydrocarbons: .462 gm / km (max= .99)
CO: 8.5 gm / km (max = 12.43)
NOx: .996 g / km (max 1.55)
This illustrates that even after 230 000 km, a modified, non-dyno-tuned engine can easily pass a pretty strict emissions test. I've owned my truck for better than 10 years now, and even with the blower on it, the vehicle still burns pretty clean! (It's at least as good as it was with the factory computer and NO blower.)
There is NO need, then, to dump the catalytic converter, the EGR or any of the other emissions equipment. We can enjoy "higher performance" without compromising environmental quality any further than would be the case with a stock engine.