Compressor Bypass Valve
I have been trying to find an alernative to the standard Volvo part for my 940. I understand 850's and a few others use the same valve.
Whats the general opinion regarding increased boost verses bypass valve life ? The on on my car is ok at the moment but genuine Volvo ones cost about £130 and no aftermarket direct replacement is avaiable. I have spotted some for sale in Japan for a slightly better price. Trouble is even a new one might have limited life when running higher boost. The other alternative is to fit a Saab type bypass valve (re-circulation type) and fit a blanking plate. Can anyone help ? |
With a little alteration to some pipework you can fit a DV30 Bailey recirc valve that is rated upto 60psi IIRC. You would fit a blanking plate then fit the valve taking the pressure forom the throttle body (as near as possible for best results) then dumping it back post Maf but pre Turbo.
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Thanks for the reply. I'm thinking that might be the best way at the moment. I know Forge do the blanking plates and LMA do various valves and bits of pipework. All it would need is a pipe fitted into the steel one from the intercooler. It's just the return that might be difficult to do well.
I have found that IPD in America can supply diaphrams but I don't know exactly what they are yet. It surprises me that nobody keeps them in this country. Plenty of companies supply recon turbos, I wonder what they fit ? |
I have just been looking oon turbo vricks site and found a bit of info on CBV's.
I'm wondering if the part I was told about by Volvo is the right one. Are there different types of Mitsubishi bypass valve ? The price did seem over the top for a diaphram and spring and the picture on Vadis looks more like a thermostat for want of a better discription. The part number I have is 271640. This part is also listed for the V70. if there are different ones then the choices are more limited than I though. |
You can step off the CBV internally with a spacer behind the spring to increase the spring closing pressure so that it will work with higher pressures. The refurb kits on ebay from a few sellers are actually genuine Mitsubishi parts direct from Japan.
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I've got a shim under the spring seat which has helped I think. Trouble is the diaphram is the original and it's being asked to do a bit more than it was designed for. Saying that the turbo plus lit on the 940 gave about 10psi and there must be a reasonable safety margin built in.
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