Quote:
Originally Posted by SpeZ
Hmm, my 2019 ZL1 SC750 from Callaway just has the stock airbox with a green filter.
Actually at WOT the barometric pressure drops up to 1.5 PSI which means the supercharger creates a vacuum in the intake.
This leads to high wear of my LT5 TB which usually only lasts 1-2 seasons each time before it starts dropping off throttle body codes at WOT.
The main restriction is caused by the air filter. The surface is just not large enough.
A cone intake like rotofab offers a lot more filter surface.
For sure doing cuts in the stock airbox allows to suck in more air through the restriction. I see it as 1 main restriction from the filter and another smaller restriction by the small opening.
106 Hz to be fair does not sound like alot to be honest.
I might gonna try this anyway, if I fixed my fender liner. Which basically is barely there anymore.
Can you share what exactly you did on your stock intake?
I did already cut out all the grids from the lower half. Worried about the upper half in terms of MAF reading with changed airflow.
I am considering cutting the lower half like in the first post of this thread.
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No doubt the OEM paper filter is more restrictive than an oiled panel or cone, but my hesitation is how much a different filter alters the MAF signal due to changes in airflow quality. GM calibrated the MAF around the stock paper element, so changing that can shift the transfer function.
Turbulence clearly matters—otherwise GM wouldn’t have designed the airbox with a diverter/straightener ahead of the MAF. In my experience, a higher-flow filter might pick up a bit on the top end, but it can cost some mid-range torque if the MAF readings get skewed.
Of course, once you’re tuning, that concern largely goes away.