[Diy_efi] CIS EFI via Fuel Pump PWM

[Tlsalt at aol.com]

 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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