oxygen sensor readings

[martin at mgass.demon.co.uk]

Dear Rich,

Read you EFI article with interest, have a question for you.....

On a vehicle with a closed loop system and cat what is the likely 
effect of removing the cat and replacing it with a straight pipe ?

I reasoned as follows :

a) removing cat will alter back-pressure

b) back pressure alteration will affect air-fuel ratio.

c) in a closed loop system the lambda will detect the alteration of 
air-fuel ratio and instruct the intake to correct ?

d) this may cause a gain or lowering of power and torque depent on 
the engines characteristics.

e) What effect will the EGR valve now have if deployed by the ECU ?

You comments would be appreciated

Thanks

Martin


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martin at mgass.demon.co.uk
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