Milky

Ive got 24# injectors and a MAF Sensor calibrated to 24 from 19... The housing for the MAF sensor is C&amp;L 76mm which is fine, but I would like to replace the injectors with new 24# (would 30 be overkill? I have a moderately modded engine.. cam intake heads etc..) and also the actual sensor. </P>


Does anyone know where I can get a good set of injectors and a new sensor w/out the housing???</P>


Thanks.</P>

vfast

24's would be enough believe me..
as for the parts you need e-bay would be a god start

Milky

Thanks, ill look

horatio102

You've got 24 lb injectors, are they bad? Why do you want to replace them? And you're MAF is already calibrated for 24's right? Why do you want to get a new sensor?

I'm confused.

n2o44

me too</P>


</P>

Milky

The injectors I'm not sure of, but they look like crap (dirty) and the meter was tuned amateurly and is still not right, so Id rather buy a meter already calibrated for 24# and it cant hurt to have the new injectors.</P>


When you replace stock 19# with 24, Im sure you have to adjust the computer, am I wrong? How do I do that when I replace these old 24#'s and the old meter?</P>

vfast

what color metering tube you have in the maf?

horatio102

There's 2 ways of dealing with it.

You can either get a meter that is calibrated for the new injectors, or you can program the computer.


Let's say the stock MAF puts out 1.000 volts when 100 CFM of air is being consumed (random figures). With 19 pound injectors let's say it requires 1 ounce of fuel to be squirted.

Now let's say you threw in some 38 pound injectors (for simplicity, work with me here). With the stock MAF, and without adjusting the computer at all, if engine is consuming 100 cfm of air, it still thinks that 1 ounce of fuel is correct, so it will spray for as long as it takes to squirt 1 oz of fuel with the 19lb injectors. Unfortunately, since the injectors have twice the flow, you're going to get 2 ozs of fuel, and your engine will run like crap.

So to get around this, you buy an aftermarket MAF that is calibrated for the 38 pound injectors. What that means is that at 100 cfm of flow, the new meter is going to output .500 volts. This tricks the computer into thinking it only needs 1/2 as much fuel, so the computer squirts what it thinks is .5 oz of fuel, keeping the mixture correct.

Now if you put the stock injectors in, you're going to be injecting 1/2 as much fuel as you should, and you can really damage stuff, which is why it's important to have the MAF and injectors matched.

The other way to do it is via a tuning chip - Tweecer or the likes. What you do is tell the EEC exactly which injectors you have, and then you load a MAF Transfer chart that tells it exactly what the MAF output voltage is for a given airflow, and the EEC calculates how much fuel to inject taking the Transfer and the Injector slope into consideration.

Milky

MY metering tube is justa silver metal, not chrome</P>


</P>

Milky

horatio, How can I tell if this "amateur" tweaks the computer or the meter itself? </P>


Thanks for the explanation by the way...</P><edited><editID>Milky</editID><editDate>37994.6655324074</editDate></edited>