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GUMP · 08-31-2021, 10:33 AM

Great points on both sides of this debate. I have cars running both.

My 396 port injected combination has always been in Alpha-N. It is very consistent, but needs regular tweeking.

The two cars that I am currently towing around are direct injected. I run them in closed loop. I aim for a 1% correction window. With the maximum being 10% in case I run into crazy air. That way I can see how much adjustment I need to make to fix the base tune.

I check my TPS on a regular schedule. I also verify that the throttle is opening 100%.

The O2 sensor gets changed at the start of each season and any time I have a major engine failure.

08-31-2021, 10:33 AM	#8
GUMP VIP Member Join Date: May 2002 Location: Shelby, NC Posts: 1,817 Likes: 2,143 Liked 2,323 Times in 546 Posts	Re: Closed loop? Great points on both sides of this debate. I have cars running both. My 396 port injected combination has always been in Alpha-N. It is very consistent, but needs regular tweeking. The two cars that I am currently towing around are direct injected. I run them in closed loop. I aim for a 1% correction window. With the maximum being 10% in case I run into crazy air. That way I can see how much adjustment I need to make to fix the base tune. I check my TPS on a regular schedule. I also verify that the throttle is opening 100%. The O2 sensor gets changed at the start of each season and any time I have a major engine failure.