02-18-2013, 07:42 AM
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#20 (permalink)
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A True Z Fanatic
Join Date: Jan 2012
Location: Dallas/Ft.Worth
Posts: 3,349
Drives: Noisily.
Rep Power: 22
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Quote:
Originally Posted by chrischhorn
i understand what you're saying and it makes sense. funny thing is you say maxed out A.k.a. running lean. My car with all my bolt ons was running so pig rich at points hitting 10.9:1 in the afrs. my car was straight up dumping fuel without a tune. my mpg was like 17-18 without the tune. got it leaned out to 13:1 afrs and my mpg is back up to low 20's and the pulls like a beast. Maybe my car is an oddball but without the tune i was running stupid rich and needed to lean it out bad!
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Quote:
Originally Posted by TerribleONE
super odd... glad its runnin good now!
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The engine will go into a 'mode' where it dumps fuel in open loop mode, if you add too many breathing mods without a tune.
The Nismo intakes (that I have) are one mod that if you put it on without a tune, it'll just go full rich, 10.5:1 or whatever the low threshold is on our O2 sensors. Even with their MAF spacers (which are just like the ones AAM includes in their intakes).
Strange, but I think it's a protection mechanism.
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