[Diy_efi] Re: OT: Tunning TDi Landies

[Stephan Helbig]

Hi Toby,

If it's a mechanical Bosch distributor pump you can raise the maximum
fuel injection deal per stroke. There should be a sealed screw above the
outgoing injector lines and right above the shut off solenoid. Remove
the seal and turn it in at about 1/4 and do a test drive. The engine
will become a bit smoky but for racing it shouldn't be important.
However, don't go too far as otherwise the fuel will not be sprayed into
the piston hole but against the cylinder walls. Just go as far as the
engine becomes smoky. 
Boost pressure can IMHO get as high as 1,8bar at this compression ratio.
VW TDIs use a boost pressure at about 1,1bar with the original
intercooler and Ford Mondeo TD (90hp) even goes up to 1,8bar. So if you
have a bigger intercooler, just go ahead, but do not get rid of the
overpressure waste gate. 
You can also turn the pump up to the most advanced position (see factory
data). There is usually a range of some mm left. 

Stephan

TVS schrieb:
> 
> > The engine is a 4 cylinder, 2.5liter with a 90.5mm bore 97mm stroke. It
> > produces 110hp @ 4,000RPM and 195b ft @ 1,800RPM. Valve are 39/36.5mm
> > inlet/exhaust The turbo is a Allied signal unit with max boost of 0.83 to
> > 1.04 The intercooler is small and robustly made with a very thick casting.
> 
> > Is the pump an electronic one, or a mechanical one?
> > If it's electronic, you need to find out who makes your controller.
> > Then we can tell if there's anything you can do.
> 
> No, its all mechanical. The later ones do have a ECU but as far as I know
> that's only for EGR for emissions.
> 
> Typically, on a engine of this kind, will the injector pump pressure be
> sufficient if, say, the boost pressure was dubbed? Is it advisable to reduce
> the CR if running high boost pressures? Its currently 19.5:1, obviously it
> can't go much lower otherwise the engine wouldn't run with boost pressure.
> Would a custom cam with earlier exhaust valve opening and later inlet valve
> closing be worth while? The engine makes peak power at 4krpm but is factory
> red lined at 4,600rpm.
> 
> There are a good few of these engine being used, but the normal tuning
> procedures (if that's what they can be called) normally result in the engine
> lasting about one season! I've heard of people removing the turbo waste gate
> diaphragm and bolting the waste gate shut. I want to do this job properly
> and do it once.
> 
> Many thanks indeed, Toby

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