Thread: L67 injectors on L32 IFR help

Ok question. I am going to be upgrading to 42# injectors, they have the older style clips. I got a set of clips and a known good set of older 97-03 L67 injectors. I soldered and heat shrunk the clips on and put in the older style injectors into my 04 comp g.

Now even using the 97-03 injector flow rate table or the 04 injector table I still see 10 to 1 afr on my wideband under quarter throttle. Any higher and it just pegs out super rich.

My question is has anyone else ever done this and got it to run good? And what should my injector table look like to make these work?

L67 and L32 have the same IFR because they both use a 36 lb injector. when switching to the 42.5 lb injectors you divide 42.5 by 36 or something like that to get about .847. if you are using hp tuners your IFR will be higher because the pcm will pulse the injectors less times with a higher number. if you are using dhp it is the opposite.

I figured it all out on my own.<br />
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All this info came off of witchhunter.com which tests and meters fuel injectors<br />
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This is their test of a new L67 injector tested at 43.5psi<br />
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This is their test of a new L32 injector tested at 43.5psi<br />
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Then I had to take their test of cc/min and convert to lb/hr. For the L32 I got 33.3. For the L67 I got 33.7. This is using witchhunters conversion calculator<br />
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Then I had to convert the pressure readings in 60psi flow instead of 43.5psi taking into account the 04+ fuel pressure and non return system. I got 39.1 lb/hr at 60psi for L32, and 39.6 at 60psi for the L67.<br />
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Then I took 39.1 divided by 39.6 and got .987 which is 98.7%. Then took my stock IFR table for the 04 and multiplied it all by 98.7% and got my new table.<br />
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Car runs awesome now