Blow off valve

Hey Brendo,

Why do you want a blow off valve?

They are only necessary to prevent the sudden deceleration of the turbo turbine blades when the throttle body butterfly closes on petrol engines, (which also allows faster pick up when back on the throttle because the turbo is still spinning).

I don't know huge amounts about all the diesel engines out there, but as far as my limited knowledge goes most doesn't have a throttle body...

I'm sure others will be able to set me straight if this is incorrect.

Ross.

P.S. We have one on our WRX and it makes a big difference to boost response, and from what I can tell turbo longevity.

As poted above the reason for the BOV is to keep the turbo spooled. With a throttle, the pressure on the compressor casues the turbo to slow when the throttle is closed. The 3.2 Titon has no throttle and has a variable vane turbo which helps keep the turbo spooled when at lower revs. So no need for a BOV.

"Hey guys, have been reading up on BOV on turbo diesel's. I have a new Triton 3.2 turbo diesel. A lot of people say that it cant be done,"

- what is "IT" that can't be done ????

Why do you want a blow off valve?
To play boy racer and go 'whoosh' all over the place every time you change gear :o)
Havn't tried it, but .................
If you really have to, why not take the blow off hose from the waste gate and put a blow off valve on the end, with the whistle you want.

The waste gate blow off is plumbed back into the intake manifold by Mitsu. Remember to block off the hose inlet on the intake manifold. Bit of hose and screw would do it.

Now it can be a bit of fun for a lark, but you do get fed up with it.
In playing with the boost on my pajero, I over boosted it and the manifold safety valve would let go with a big whoosh. Could do it in 1st, 2nd and 3rd with 3000rpm. Good fun in the city with all of the young uns around and me going whoosh taking off from the traffic lights, and they all look and see it is an old bloke in an old diesel pajero. Won't describe the look , you can imagine:o). Only did it one night for a stir. Got fed up with it. The paj actually was faster block to block than some of the ricers since I could do 50km/hr over the speed bumps while they would only do 10. But they were a bit faster taking off from the lights. :o)

hey the new 3.2 turbo diesel wastegate is operated by a vacuum switch. The switch has constant vacuum to it, as does the wastegate. When the throttle is backed off the switch closes and vacuum is no longer at the wastegate(Goes to atmosphere 0 on the boost gauge). When there is no vacuum the wastegate opens.

I know i need vacuum when i back off for the blow off valve to work. Just not to sure how i can achieve this without the use of another pressure switch or something.