Blow Off Valve?
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From: auburn, al
Blow Off Valve?
Do the 6.0's have blow off valves. My buddy's evo has an aftermarket one that sounds rediculous and it got me wondering about my truck. And if they do does anyone make an aftermarket one?
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Typically Diesel engines don't have blow off valves as they don't have a throttle body. A gasoline turbo engine needs one because when you let off the throttle it creates a closed line between the turbo's compressor and the engine creating a lot of pressure with no where to go, which can snap turbo compressor wheels or blow seals. Diesel with no TB the extra pressure is just pumped into the engine as normal. I've heard of surging problems on some Ford diesels which this would help wear on the turbo but this is a poor engine management problem adequately controlling the adjustable turbo or wastegate.
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From: Las Vega$
Originally Posted by tippmann87
The 6.0 turbos are pretty loud as is, don't know why you would want one. If you still wanted one, I'm sure you could find one, but it won't increase performance at all.
he would want one because it saves the turbo from compressor surge (the dreaded turbo fart),
but alas, diesels don't make vacuum like gas motors do, and it's the vacuum that operates the blowoff valve. there is currently nothing available aftermarket for the PSD as far as a blowoff valve.
there is a company that is offering one for the duramax, it's electronically operated and it's quite expensive, i've been tinkering with designing one for my truck myself
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From: Las Vega$
Originally Posted by brusk
Typically Diesel engines don't have blow off valves as they don't have a throttle body. A gasoline turbo engine needs one because when you let off the throttle it creates a closed line between the turbo's compressor and the engine creating a lot of pressure with no where to go, which can snap turbo compressor wheels or blow seals. Diesel with no TB the extra pressure is just pumped into the engine as normal. I've heard of surging problems on some Ford diesels which this would help wear on the turbo but this is a poor engine management problem adequately controlling the adjustable turbo or wastegate.
it does not increase performance, it increases the longevity of the turbo.
and it is not "poor engine management problem" that causes surging always, sometimes larger compressors than stock will surge because they are trying to supply more air than the engine can utilize at a certain RPM.. especially on VGT type turbos that do not have a wastegate to control boost...
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Yes that's what I'm saying the engine management controlling the VGT and or wastegate, the PCM should be able to control this better. BTW Greddy did make a BOV that was vaccuum controlled and also has a pressure adjustment but those types won't handle the type of boost a diesel truck puts out.
