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SWIRL FLAPS
The Forge Motorsport Swirl Flap Blank kit allows the removal of the
problematic OE swirl flaps in the inlet manifold commonly found in the
Vauxhall 1.9 CDTI (Z19DTH), meaning there is no need to replace the
existing manifold, instead it can be modified with this kit.
It is designed to fit the later design Pierberg manifold (7.00373.12.0)
that uses the larger 18.5mm swirl flaps. Once the flaps are removed this
kit blocks off the holes that remain.
Please note these are not a direct fit to the older design manifold
that uses the 15mm swirl flaps, unless the manifold is machined out
to accept the larger 18.5mm bungs. It is common for cars that used
the older 15mm design manifold from standard have had the manifold
replaced to the newer 18.5mm manifold in their life, but your customer
will need to check the size of their swirl flaps holes.
Once the swirl flaps have been removed of the manifold will now be
free flowing. The flap actuation motor should be left on the vehicle, and
connected electrically, but with the lever arm disconnected. This allows
the ECU to recognise that the motor is present, and working, and will
not cause the EML light to came on.
Removal of the flap system often results in a much smoother drive,
better fuel economy and most of all future proofs the vehicle against
future inlet repairs/problems.