Plemun and trumpets

[jacjac]

Has anyone had any experiance of increasing the volume of the plenum by means of a spacer from TVR Power and/or SC Power. Apparently the 'ideal' is to have the plenum volume equal to the engine capacity. Because TVR used all the same 4 ltr Range Rover plenums - making my 500 a bit short of breath! The kit also comes with an insulating gasket to stop heat soak from the engine which keeps the air passing through it cooler and thus more dense. Also looking at fitting bellmouth trumpets to improve airflow into the engine. It all makes sense in theory - any experiences?

[jacjac]

I spoke to Colin Harvey at SC Power (very helpful). There is a 15mm ali spacer between the bottom of the plenum and the trumpet base then a 2mm insulating gasket that fits under the trumpet base. Total 17mm increase in height which should fit under a standard Griff bonnet and give the plenum a capacity of 4.6 litres. The trumpets Colin said he could give an exact length of the inlet tubes to be cut to according to the state of tune of the engine. He said he was planning to offer the service of supplying the tubes already cut to the correct length - which is what I'm waiting for. I assume from the replys so far that no one has done this upgrade? Maybe I will be the first and let you know how it all goes.