[Diy_efi] CIS EFI via Fuel Pump PWM
Tlsalt at aol.com
Tlsalt at aol.com
Thu Aug 8 17:20:04 GMT 2002
Stephen Webb wrote,
While on the subject of CIS:
I have read in a few places that the actual CIS airbox / air flap
restricts airflow, and is responsible for up to 20% (?!) loss in airflow.
Does anyone know how true this is?
Hello Steve,
Somewhat true. Even Bosch admits this in their literature and cites it as a
benefit of the hot wire and hot film air-mass meters. Numbers vary all over
then place, but one ex factory engineer who did dyno test on L-jet motors,
with and without the meter, was surprised to find a 15% increase in output.
Having had both L-jet and CIS motors, I'd guess that CIS is even worse than
the L-jet meter. I have an L-jet engine that I converted to a speed density
system, which was enough to convince me. Others may need sugar coated
potions.
Paul
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