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Disco 1 Snake oil?
- Thread starter The Mad Hat Man
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ozzyboydeano
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don't worry mate I have a fair understanding how they work not exactly every bit of detail but most of ...but with out having the system tested from a specialist ..they run the riskAnd the moral behind this story is, don't play with things you don't understand.
I normally use the same injection specialist that we use at work costs me nothing to have injectors tested as well as some fuel pumps I do drop in a carton of beer every now and again though keeps him sweet
the vid can be also misleading to others .there could be a slight blockage resulting in high pressure not enough flow etc and now he is compensating for other issues .by changing the timing or fuel rate
like I say without knowing how the injector performs crack pressure spill pressure and atomisation adjusting the fuel pump to compensate can be an engine killer
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He is not altering the fuel rate. The mod is about altering the amount of automatic dynamic timing adjustment available. It does not effect fuel amount at all, just the point of injection. The pre-injection internal pressure is provided by the internal pressure pump. This runs at between 3.5 and 4.5 bars dependent on RPM. At around 4.5 bars the pressure relief valve opens and returns fuel to the inlet side of the internal pressure pump. Normal static on these pumps is 1.54 mm lift on cam at TDC. The dynamic timing device advances this subject to internal fuel pressure as RPMs rise. This mod just gives slightly more available dynamic advance.
ozzyboydeano
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so if one has a dribbly injectors or a worn out injector nozzles advancing the fuel injection is the way to go via the fuel pump to gain more power or is this just compensating
bandade fix
and without knowing how the injectors performance its only a big guessing game
the injectors them selves have moving parts as well as preloads and tolerances.... like I say there is no electronic on the injector .they rely on the fuel injection pump when to open and close ...
what if the injector does not like to the different fuel settings ? without known you have a worn out nozzle or the injector is fatigued advancing any timing should be put on hold
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I can only explain what it does. Whomsoever is fitting it will have to make the decision as to it's suitability for his particular car.
ozzyboydeano
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basically its a mechanical version of a remap and a mild remap if that
would like to see some rpms and boost gauge readings before and after
it been known some remaps to create conflicts just saying
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On the EDC version of the pump a remap just alters fuelling it does not effect the timing modulation. There is a very simple way of improving low down tractability and power on the mechanical VE pump.
ozzyboydeano
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alters the fuelling how ?
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It changes the fuel map to give slightly more fuel at any given throttle position within the smoke limitations. There is only one way to increase power and torque on a diesel engine without any other modification, that is to increase fuel.
ozzyboydeano
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what about a clean burn scenario those who think they roll coal...ie black smoke ...... a clean burn actually produces more power its a well known fact
so lets just dump in more fuel using the stock intercooler and original waste gate settings should work right and overlook EGTs on the stock system should be ok
so lets just dump in more fuel using the stock intercooler and original waste gate settings should work right and overlook EGTs on the stock system should be ok
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You still get a clean burn if the remap is done properly within the smoke limitation map. The stock intercooler and waste gate settings will work just fine.
ozzyboydeano
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that's if injectors are working correctly..how does one know if there are any compensation just because the fuel pump has a set or desired pressure
how sure are you all 4 Injectors are working the same ?
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Anyone with sense would not use a remap to cure bad running problems.
ozzyboydeano
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how dead set sure about this this is a forum full of many people some probly have never changed a tyre in there life or even where to check engine oil level never mind diagnosing power issues
to have the injectors checked is cheap to have the injectors serviced is costly as the injector at fault maybe unserviceable and maybe a new injector is needed ..
to be honest some injectors failing don't give off any other symptoms or rough running as other injectors compensate so without having them tested .like I say it can be a guessing game
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I can only speak from my perspective and not from the perspective of others. Too many people who do not know what they are doing read tuning comics and bugger their cars up.
ozzyboydeano
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as we normally use the drivers chair as the dyno type system
same on other parts of the forum ..people advise so many turns on the waste gate actuator arm should be the same as another without any boost pressure gauge installed ... not to mention different spring ratings and age will have a big affect
I have learned my own mistakes that playing with fuel pumps a pyro gauge should be fitted... just like a boost gauge should be fitted when playing with turbo pressures
turning the fuel up or advancing the fuel on an injector that has done 3000k will perform differently to a new injector
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If you have a below par engine sort it out. Looking on Ebay and thumbing through tuning mags for sometimes dubious modifications to improve performance is a fools errand.
ozzyboydeano
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or those who think they know what there doing really don't ... and modifying the fuel pump it feels great in the drivers doing it by trial an error of feel
was the fuel pump checked for flow rates was the injectors tested for crack pressures and spray atomization this leads back to a fools errand also
on the flip side
normally when you remap you need extra bolt ons .
normally the correct way to remap is bolt ons first like exhaust intake intercooler larger injector nozzles etc then the remap is then to suit
not the other way round lets remap then do bolt ons
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That would entirely depend on the level you wish to achieve. The P38 diesel can be mapped from 136 BHP and 280 Nm of torque to around 175 BHP and 320 Nm of torque with no need for any other modification. Providing the engine is sound and running normally that is. Chipping one to cure a sick engine, as said earlier, is stupid.
