95Bluestallion's head swap pic thread

alleymad95GT said:

Nah, I don't think so...

You are drowning it even more by having the undersized MAF. Think about it like this...

A 24# injector puts in some fuel per pulse (keeping it simple, as pressure and duration will affect this as well, but conceptually it will be accurate). Lets say that is amount X.

A 42# injector also puts in some fuel per pulse. Obviously, when the 42# injector pulses, it pulses more than a 24# injector, right? How else would it flow so much more fuel? So, lets say the 42 # flows an amount of fuel equal to X + Y.

Now, X + Y is obviously bigger than X. Of course. Bigger injector.

Now, your 24 # MAF. It gets some air flowing over it. That air flow is translated into a voltage that is sent to the computer. Lets say at some airflow, that voltage is A.

Now, at out hypothetical airflow (whatever it may be), voltage A tells the injector to pulse exactly whatever our hypothetical fuel value X was. Now, what happens if you send the computer voltage A, but you have the 42 # injector in there? Well, the injector pulses X + Y fuel. You see the problem?

A calibrated MAF effectively shifts the curve of the MAF function. The MAF knows how much air your combo is sucking through it. That is its entire purpose. It sends a signal to the computer based on that air flow. Your problem is it is seeing some airflow and sending a signal that will deliver the proper fuel if you had 24 # injectors. You are way rich since the 42 # injectors are so much bigger.

Will the car be the BEST that it possibly can be? No. It will probably be hard as hell to start. Can you get it running really well by prudent adjustments of fuel pressure? You bet. I bet you it will do just fine once it is started.

JMHO, of course...

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