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The mkiv Supra Owners Club

found the cause of the wailing sound


brians25

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well thankfully it wasn't the turbo's or the intercooler, it was my blitz dump valve passing air whilst the car is on boost from about 3k upwards , why it was doing this i do not know, i have stripped it down and all looks fine inside it, the only thing i can think of is that the spring has become weak,

 

anyone got any ideas what caused it to do this as it was working fine for the last 8 months

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  • 1 month later...
well thankfully it wasn't the turbo's or the intercooler, it was my blitz dump valve passing air whilst the car is on boost from about 3k upwards , why it was doing this i do not know, i have stripped it down and all looks fine inside it, the only thing i can think of is that the spring has become weak,

 

anyone got any ideas what caused it to do this as it was working fine for the last 8 months

 

Did this have any negative impact on performance, have you noticed any improvements since changing it?

 

imi

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not by a considerable amount but by a good 20bhp or so, still messing with different spring rates in the bov just now to try an get it sealing the boost proper, but looking like i'll just have to put the stock bov back on full time

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