Need new injectors? New Maf or TB?
12-12-2005, 01:35 PM
#1
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Need new injectors? New Maf or TB? How do you know when you need new injectors? bigger ones i mean... I wanna do H/C setup on the car and dont know if I'll need them or not.. Also, do you need a new maf or Tb when doing this or is it only for more performance? Is it highly reccommended? I'm trying to figure out how all tis jazz works thanks!
12-12-2005, 01:56 PM
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You only need a new maf if your stock maf pegs, that is, when your airflow becomes greater than the MAF is designed to measure i.e. when the maf outputs a constant voltage at or above a particular airflow rate, it's pegged. Swapping MAFs without properly calibrating the maf transfer function in the PCM is going backwards. Many aftermarket MAFs that claim a performance gain simply allow more airflow while producing the same voltage output to the PCM, effectively leaning the car off. This works since stock LS1s and especially ones fitted with headers run plenty rich and will gain power from leaning the mixutures. But doing this will throw your trims all out of whack and the power gain will eventually dwindle as the PCM compensates and brings you back to where you started (in terms of A/F).
12-12-2005, 02:23 PM
#4
See the sticky in the Fueling and Injection section. Also see this link for more info on injector selection:
http://www.msdignition.com/fuel_1.htm
http://www.msdignition.com/fuel_1.htm
12-12-2005, 02:41 PM
#5
TECH Senior Member
Originally Posted by APeteSS
You only need a new maf if your stock maf pegs, that is, when your airflow becomes greater than the MAF is designed to measure i.e. when the maf outputs a constant voltage at or above a particular airflow rate, it's pegged. Swapping MAFs without properly calibrating the maf transfer function in the PCM is going backwards. Many aftermarket MAFs that claim a performance gain simply allow more airflow while producing the same voltage output to the PCM, effectively leaning the car off. This works since stock LS1s and especially ones fitted with headers run plenty rich and will gain power from leaning the mixutures. But doing this will throw your trims all out of whack and the power gain will eventually dwindle as the PCM compensates and brings you back to where you started (in terms of A/F).
I have wideband O2 guage.
I was running 14.7 stoich and 12.6/7 AFR WOT (nitrous tune), stock MAF.
Then I decided to run my old Granatelli MAF just for kicks.
Instead of going leaner, it went richer.
14.3 stoich and 12.0/12.1 WOT.
That baffled me
