Lbs/min airflow value

[DetroitStroker]

i understand "what" it is. But my questions or thoughts are; if you log 50lbs/min in 2nd gear but in 3rd or 4th flow a max of say 42lbs/min - is this an inflated reading in dsmlink while in second gear? (possibly due to 3" gm maf?)

Or did you actually flow more air in 2nd then in 3rd?

 

[DetroitStroker]

I guess this will lead to another point I have: while street tuning - is a 2nd-3rd (very close to 80mph during that shift) gear pull adequate load/gear to make your adjustments and tune off of?

 

[Brandon Mau]

There is a ton of factors to take into consideration. If you upload a log of what you are talking about we can pick it apart.

 

[DetroitStroker]

Thank for the reply

While this pertains to my vehicle; it is not a question directed to it as much as it is to proper practice / use of reading lbs/min as a tuning tool when you are street tuning and making pulls in second gear.

Kind of like making dyno pulls in the 1:1 gear or closest

 

[Brandon Mau]

I would say it's inflated unless you are using boost by gear and purposely running lower boost. This being said about a completely calibrated tune where global fuel, deadtimes, ve map, wb est and actual are all in line from 4500 rpm and up. When you go to a dyno to get tuned they will use it to dial in afrs and play with timing to find mbt on your particular setup. Once that gets dialed in they use 3 or 4th depending on power level because some setups smoke the tires in 3rd from insane amounts of power to finish the wot/after mbt tune. I wouldn't use any numbers from 2nd gear if I was trying to get calculations unless it was an automatic transmission. Hope this gives you some clarity on what you are asking. I'm sure others can chime in that actually tune cars for a living.