Thread: 13.8 MPG! wow....

Originally Posted by matt5112

I've seen comparisons of MAF and SD calcs on a V8 PCM.

It seems they were both as accurate, but the MAF had more outliers.

Flexibility of the SD tune would depend on its accuracy.

Who is talking about speed density.... I have only heard of one guy actually trying to run his naturally asperated car on SD mode full time.

Originally Posted by darkhorizon

Who is talking about speed density.... I have only heard of one guy actually trying to run his naturally asperated car on SD mode full time.

Good point.

However I can only think of two reasons you'd want to run open loop though.

Lean cruise or by-pass MAF.

Originally Posted by matt5112

Good point.

However I can only think of two reasons you'd want to run open loop though.

Lean cruise or by-pass MAF.

You can run in sorta closed loop in SD mode though.... The few SD LSx cars I have tuned pretty much need to have a narrowband helping them out for cold/hot stuff unless you really play with dialing in the tune.... Even then I had problems.