Optimum placement of MAF sensor
The OP and I had a short discussion about this when I visited with him in Savannah (GA) last month, as he was showing me his OTR intake setup.
I don't know where it's written, but here's something that makes the implication that GM has some numbers they consider of significance when designing an intake:
(from Chevy Performance Parts Catalog)
Air Inlet Kit for LS-Based Crate
Engine Installation
19301246 NEW
Designed for universal LS and LSX EFI crate engine installations, this
kit contains intake tubes with provisions for the mass airflow meter and
vacuum line, along with a reusable, high-performance air filter and mounting hardware. When joined, the kit’s straight and elbow tubes provide the optimal distance between the throttle opening and mass airflow meter, including the minimum length of straight tubing required for accurate mass airflow meter operation – saving the time and guesswork involved with fabricating a similar system. The intake tubes are polished and the kit also includes couplers, worm-style clamps and a vacuum hose. The mass airflow meter provision accepts all GM production meters, which must be purchased separately.
