Vehicle & Technical > Discovery

300tdi need more power

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Budgie:

--- Quote from: "TheBlueySilverThing" ---yep yo right
but,
ive done 3 intercoolers now and all three where like me arse until the smoke screw was altered, off booste was rubbish and so was on boost
that was with the diaphram already at 90 on all

i do the smoke screw at work on the lathe

dan
--- End quote ---

If you mean 90 degrees Dan then on large intercoolers that's too little. The diaphram needs to be turned at least 120 degrees from it's standard setting to allow enough fuel in.
With a standard intercooler I'd turn the diaphram 90 degrees max from the standard setting, after that then your're just wasting fuel.  :wink:

extreme90:
yer, the owners didnt want more as per instructions  :?
dont ask why i honestly dont no, it wouldnt really effect fuel that much as they were concerned about, as your still doing the same speed just at a diff throttle position ( i.e less)
you only drink it when the foot is down
my pumps at around 130 ish :twisted:

on another hand on the towing wise, ive just thought allisport do a thicker high flow std size intercooler dont they  :?
that would help out, but its still going to be running warm as itll need fueling turning up

dan

Porny:

--- Quote from: "Budgie" ---
If you mean 90 degrees Dan then on large intercoolers that's too little. The diaphram needs to be turned at least 120 degrees from it's standard setting to allow enough fuel in.
With a standard intercooler I'd turn the diaphram 90 degrees max from the standard setting, after that then your're just wasting fuel.  :wink:
--- End quote ---


But what's standard??
I've tweaked Tdi's that have had the diaphragm set to min point - from new, and I've seen others when the diaphragm is nearly at max.

The other thing is the dot on top of the metal plate - if the diaphragm has ever been replaced, then the chances are the dot is no longer in the correct place - no two cars are the same... so what works on one, might not work on another.

My 90 runs with the diaphragm set to its max point, without any problem... the star wheel is also tweaked - again without excessive black smoke.

What you need to do it get an understanding of what does what, and then try each modification until you get the desired results.

And if you start turning up overall fuelling then you really want to measure EGT or you will cause damage.


But... the one thing everyone seems to miss is the most important point!!!

Make sure everything is working correctly before you even think about doing any modifications/tuning!!!


I.e:

Check engine and FIP timing is correct - retarded cam timing makes quite a difference!! - you could also advance the FIP slightly.

Check that the fuel pin that operates on the diaphragm is actually moving and not seized!

Check that the throttle cable is correctly adjusted.

Check that you making 1.0bar boost pressure

Check that the lift pump is working correctly

Check the valve clearances - again can make quite a difference

Check that the fuel filter and air filter are clean

Check that the intercooler is clean

Check for splits/leaks in any of the intercooler hoses


Only when you know that everything is correct, and thus the engine is making its (standard) full potential should you start trying to get more.



Have you got EGR fitted, or a CAT in the downpipe?

As mentioned, having the injectors (at least) overhauled/tested/clean will usually make a difference on a high mileage car.




Ian

chaosego:
i am thinking of getting a cat and mid box replacement pipes will this help power on a standard auto 300 tdi cheers glyn

Range Rover Blues:
I'd be interested in a definite answer to that, a bloke was selling a S/S system on fleabay with no boxs whatsoever in it and reconed on about 8BHP extra.

But which boxes can you get rid of legally and which are going to make it wake the dead?

When the TDi goes back together next week it's got a new full width intercooler and the inlet pipes and plenum are as clean as they can be.  I know it's been tweaked a bit before so I'll be interested to see how it goes, but most of all I'd like it to be more economical.

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