Hi all,

A friend and I are having problems with a D Reg Cosworth. The car drives spot on other than having boost problems. We installed a boost gauge today to see what kind of pressures we are getting.

When driving in any gear at say 1500 rpm, then foot flat to the floor, I would expect the boost to start rising around 2-2.5k revs then hit peak boost somewhere between 3-4k revs but the car just doesnt boost. A peak boost of around 0.5bar is acheived at somewhere between 5-6k revs with not much below that.

We have gradually wound the actuator rod in little by little, and is currently set on its shortest setting, but this hasnt made any difference what so ever.

We disconnected the AMAL valve and had the actuator running directly from the compressor housing on its shortest setting and it still wouldnt hit peak boost (0.5 bar) till around 5 revs.

Other than this the car drives ok with no smoke, bangs etc.

It feels as thought the engine isnt detecting any load on the engine, if that makes sense. Its feels like its boosting far too late in the rev range and the boost levels seem a little low. The ECU has been labelled up as 'stage 1' also.

Could this be a faulty AMAL Valve??

Any advice would be greatly appreciated as its driving us nuts.