Vehicle & Technical > Discovery

Moving the waste gate actuator pipe.

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bilge rat:
i did mine and to be honest it just seemed to smoke more and not any noticable change in performance, so i altered it back .. just put  a cap over the pipe i made, so maybee put  a boost guage to it ?. not sure yet. i got the origanal plug drilled it out and soldered in a peice of copper pipe .alan....

Disco_Stu:
Hmmm, cheers bilge rat.

I may have to give it whirl anyway. I'm like a dog with a bone when I get an idea in my head. With what you've said though I think Ill treat it as an experiment and be willing to change things back if I dont like the results. I had planned to run a boost guage from one of the outlets at some point so I may end up doing just as you've done.

Stu.

stageonesimmo:
It made mine go faster!

I'm in the process of thinking why it would have made Bilge Rat's smoke more - its had no negative effects on mine or anyone else I've seen/heard of doing it...............

Range Rover Blues:

--- Quote from: Disco-Ron on August 29, 2008, 22:53:55 ---Does that not act in the same way as increasing the boost though, which apparently 300's don't like.... needs to be checked with a boost gauge to keep an eye on whats going on really.....

--- End quote ---

Yes it does, the technical spec on the TDi engines is with the turbo pressure measured at the turbo output, any losses in pipework and intercooler are taken into account by engineers (who let's face it have spent more than 5 years getting qualified and millions of pounds designing this engine ;)) so by taking the waste gate "sensing" pressure from the plenum changes the boost at the back of the valves.

I can understand that it might improve pickup, waste gates exhibit "creep" as in they begin to open before the set pressure is reached and will open whilst pressure is still building up in the plenum. But a far safer option is to use a boost control valve, these will keep the waste gate shut fully until the desired pressure is reached and that pressure can be altered easily in seconds (use a boost guage though).  They work best when the set pressure of the waste gate actuator is left at the lower pressure.

Also by sensing from the turbo not the plenum the engine gets a larger charge of fuel (the black puff of smoke) when you stamp on the throttle, this should be reduced by sensing form the plenum.  Whether you want to is a different matter, on an otherwise unmodified engine you may get less fuel being delivered.

One final thought.  If you have the waste gate controlled by the plenum rather than the turbo, what happens if one of the pipes gets blocked?  the waste gate never closes and the turbo/pipework gets damaged perhaps :-k
On a standard engine, the plenum is also full of cack from the EGR and oil mist from the turbo.  This can also block the sensing pipework.

Range Rover Blues:

--- Quote from: bilge rat on August 30, 2008, 16:29:01 ---i did mine and to be honest it just seemed to smoke more and not any noticable change in performance, so i altered it back .. just put  a cap over the pipe i made, so maybee put  a boost guage to it ?. not sure yet. i got the origanal plug drilled it out and soldered in a peice of copper pipe .alan....

--- End quote ---

I'd considered fiting a second boost guage there, it would give some idea of the efficiency of the intercooler upgrade.

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