25-02-2013, 11:30 PM
Your biggest problem with the L Series is that it IS Direct Injection. - whilst DI is a much better technology, it causes other issues...
Now you can fit 300tdi nozzles which are a significant upgrade as I understand, but you will still be left with the same issues, DIs require short injections, they only have the heat in their cylinders for a relatively short period (in comparison to an XUD) so long injection times (i.e. more fuel on stock injector nozzles) simply equals longer injection lengths, IDI can get away with this since the precombustion chamber is RED hot throughout the whole stroke, hence why an IDI can rev higher and make more power up high on stock injector nozzles.
![[Image: InjectorVCO.jpg]](http://vegburner.co.uk/images2/InjectorVCO.jpg)
![[Image: figure_15.jpg]](http://www.4crawler.com/Diesel/SAE/figure_15.jpg)
You can there see the difference between a DI nozzle and an IDI nozzle on the right - the IDI nozzle - the needle literally is exposed, once the needle lifts, the fuel can flow straight out - versus a DI nozzle where there's a cover over the end which atomizes the fuel through 5 or 6 holes - of about 0.15mm in diameter.
Your best option is big injector nozzles (in which case your map is going to have to be changed quite a bit, but afaik there is Damos files for the EDC15/MSA15 on them). Maybe fitting an 11mm injection head (IIRC they're 10mm as standard, but obviously reverse, but I'm sure there's a few 11mms out there that are reverse).
From when I looked at an L series - the heads on them really are very poor, great for emissions and swirl at their stock power level, but not great for power, but you need to remember that you've not got swirl chambers like an XUD - so the valves and head are inducing the swirl that's required for good combustion and it's seriously easy to screw up the swirl with head work etc.
Because of all this - it's all set for the L series in relation to an XUD9 doesn't like revs, big nozzles will definitely improve this - getting fuel in a shorter time etc. You're not going to be able to "get away" with as bigger turbos as an XUD without significant problems. However there is a good bit, you can get seriously improved torque figures, the head is set up for low down torque etc. With properly sized turbos you can get serious power out of them, they'll be more "Driveable" since they can burn the fuel better at a lower RPM with less boost than an IDI.
Hope this kinda makes sense?
Now you can fit 300tdi nozzles which are a significant upgrade as I understand, but you will still be left with the same issues, DIs require short injections, they only have the heat in their cylinders for a relatively short period (in comparison to an XUD) so long injection times (i.e. more fuel on stock injector nozzles) simply equals longer injection lengths, IDI can get away with this since the precombustion chamber is RED hot throughout the whole stroke, hence why an IDI can rev higher and make more power up high on stock injector nozzles.
You can there see the difference between a DI nozzle and an IDI nozzle on the right - the IDI nozzle - the needle literally is exposed, once the needle lifts, the fuel can flow straight out - versus a DI nozzle where there's a cover over the end which atomizes the fuel through 5 or 6 holes - of about 0.15mm in diameter.
Your best option is big injector nozzles (in which case your map is going to have to be changed quite a bit, but afaik there is Damos files for the EDC15/MSA15 on them). Maybe fitting an 11mm injection head (IIRC they're 10mm as standard, but obviously reverse, but I'm sure there's a few 11mms out there that are reverse).
From when I looked at an L series - the heads on them really are very poor, great for emissions and swirl at their stock power level, but not great for power, but you need to remember that you've not got swirl chambers like an XUD - so the valves and head are inducing the swirl that's required for good combustion and it's seriously easy to screw up the swirl with head work etc.
Because of all this - it's all set for the L series in relation to an XUD9 doesn't like revs, big nozzles will definitely improve this - getting fuel in a shorter time etc. You're not going to be able to "get away" with as bigger turbos as an XUD without significant problems. However there is a good bit, you can get seriously improved torque figures, the head is set up for low down torque etc. With properly sized turbos you can get serious power out of them, they'll be more "Driveable" since they can burn the fuel better at a lower RPM with less boost than an IDI.
Hope this kinda makes sense?
