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Please don't shout ;-)
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sorry i didnt put it in caps to sound aggressive i put it so it stands out
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STOP SHOUTING!!!
If you understood the vast difference between between the control of a petrol turbo and a diesel, then you wouldn't have even asked the question.
A diesel has no back-pressure to release - ever. [Or a vacuum in the manifold.]
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yea oright but what about on the internet and ebay theres videos of a diesel with a dump valve on driving past and under the bonnet you can tell because it sounds like a tranny van.
www.youtube.com/watch?v=f5_pODl3ckA&feature=related
and on ebay ive seen dump valve for diesels
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try using google, there are plenty of guides to doing this, the dump valve can be fitted but has absolutely no effect on the engine, it is set of using a microswitch when the throttle is closed
www.pug306.net would be a good start
chris
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That dump valve on that GM DTH is obviously being controlled by a custom-made electronic solenoid and control system - for no purpose at all except entertainment of the sad. That must cause a huge flat spot every time the throttle is re-applied.
Of course they sell them on e-bay - where else can they make a profit out of people too dense to know what a ludicrous idea a dump valve on a diesel is. There is no surplus pressure to dump - ever.
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the setup is far from custom made, they use parts from a petrol egr valve for the piping and a cheap maplins microswitch to set it off when the throttle closes and its the stop
chris
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chris
Yes; I could have put that better - it's the system that I meant was custom-built, not the solenoid. [Which was already there for the EGR valve.]
The evil flat-spot when the throttle was re-applied with a now-idling turbo must have given a whole new dimension to the phrase "turbo lag...."
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I can fit a big ham sandwich to my engine and can find them in google too, but what would be the point? If I was you, I'd just bin it or resell it.
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If you really must have one (and I'm with the others on this - why????), you can actually buy simulated ones which make the noise through an underbonnet mounted loudspeaker.
Completely pointless, but at least the engine will still run properly.
Cheers
DP
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hey there kristianc4 there are a few places that do a diesel dump valve there are a few cheap companies on ebay and then you can buy one from forge but your looking at about 230 for one of those the cheaper ones are about 130 dont listen to the people on here it has nothing at all to do with back pressure its to do with boost pressure being released from your ic and boost pipes to stop it slowing the compressor wheel down on lift off wont make much of a difference performance wise unless your running major boost
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its to do with boost pressure being released from your ic and boost pipes to stop it slowing the compressor wheel down on lift off
But this doesn't happen on a diesel engine!
There is no throttle plate on a diesel engine which means there's nothing to stop the intake air, and "slow the compressor". The intake system of a diesel engine looks the same whether the throttle pedal is at rest, or on the floor.
When you lift off in a diesel, you are simply reducing the amount of fuel going into the engine. In a petrol you are reducing (throttling) the amount of air going in by shoving a butterfly valve or plate across the intake system. This in turn can cause the compressor wheel to stall. In a diesel, it simply doesn't happen!
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Has no one noticed this thread is over a year old.
but to answer the question finally, you can fit a dump valve to a 306 1.9td, the kits that are available or can be diyed easily use a microswitch triggered by the throttle lever to tell the dump valve when to operate, it doesn't make any increase in performance at all, if anything it can marginally affect performance as the turbo needs to spool up again. people fiit them purely for the noise they make, i happen to like the noise but never fitted one to any of my 306's as i would only have one where it is actually required as a couple of hundred quid on a noise seems silly to me.
chris
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