Intake system - yd25 turbo engine

I have been wondering, does the common rail diesel engine have a fundamentally similar intake system to a conventional turbo petrol motor? ie, Air travels through; air filter > intake pipe > throttle body > inlet manifold > injectors > combustion chamber, with a vacuum actuated wastegate? or is the setup different?

Reason I ask is that I am tossing up putting in boost recirculation valve (AKA blow off valve venting back into the intake pipe) to reduce impeller stalling when changing gears in the hope of keeping the turbo spinning when the throttle is lifted. I know how these devices work with petrol motors, but have never had any experience with diesels...

Re the first part......With the inclusion of travelling through the compressor/turbo, fundamentaly yes

wont work, diesels dont have a butterfly throttle valve like petrols do.

It does work but the advantages are less marked because there is no sudden flow rate drop as there is with a petrol motor that stalls the turbo - as maddogrc just said, no throttle.

the ZD30 runs a throttle like butterfly for the egr system. i don't know if the common rail D22 YD25 does tho.
BOV's do work even without a throttle, you just have to trigger it electrically and operate it with system vacuum. how much gain......bugger all, i certainly wouldn't bother better to spend the $$$ elsewhere.

maddogrc said:

wont work, diesels dont have a butterfly throttle valve like petrols do.

Click to expand...

Yeah that's what I thought, just thought that maybe common rail engines were different...

you do not require a butterfly throttle for a BOV to work. i know a few have them running on diesels without any throttle butterfly.

final verdict, pointless...

not necessarily pointless, just expensive for minimal gain. the ones i know of where done on modded motors running large boost. for a stock motor it would be pointless.