Project EXI

The building of a Marlin 5EXi kit car, using a Seat Leon 1.8T 20v Donor
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Mar 12 2010

Removing the secondary air pump - Part 1


Fitted to a VAG engine there is a system referred to as the secondary air injection (or SAI for short). This is a system where fresh air is pumped into the exhaust, when the engine is cold.
The idea is to burn off any unburnt fuel, to speed up the performance of the catalytic converter.
For the 5EXi this is not really needed. Its not really needed in the VAg engines, the main reason here is so the VAG group meet emission requirements in the north american markets. You will find that BAM engine in the VA group dont have the SAI system fitted. Main reason is these engine are not shipped to north america.
With this in mind the 5EXi does not need the SAI system. So for my Kit this will be removed.
This involves removing the Pump, Relay, associated electrical wires, combi valve, and vacuum hose connections.
When the combi valve is remove a small plate will be need to fill the hole into the exhaust. I intend to make a homebrew plate out of 2.5mm think aluminium plate I have and a couple of M6 bolts.

Posted by Steve | Permanent link