![]() ![]() You can also remove the injectors and clean them in an ultrasonic bath with some fancy chemicals to break down the carbon internally and externally on the nozzle tip. The only remedy to get back to the big numbers is a brand new set of injectors and a 4 figure price tag.Ī small increase can be had by fitting a new fuel filter inside a cleaned filter housing and filling that with something like Forte Diesel Cleaner. As these injectors get more miles on them, this figure can drop a fair amount and it is not uncommon to be stuck at 220bhp with the injectors on the limit of what we consider safe. When doing a mild tune, the injector delivery is not much of an issue but when we start to add larger turbos, it is very important that the injectors are in good shape, when brand new the injectors can easily deliver 260+hp on our dyno with reasonable smoke and exhaust gas temperatures. If the filter has been in there for more than 20,000 miles, please let us know and we will swap prior to the car going on our dyno. Its rare we have a car in for tuning that we don’t fit a fresh fuel filter for good measure. We quite often see black sludgy fuel filters that are so badly blocked they are almost sucked in on themselves and if left will eventually make the car stutter and stall. Cheap fuel and badly designed seals plague the high pressure multi firing Piezo PD (PPD) injector. The next issue with these injectors is fuel quality. The odd car does slip through the net but rarely. Then slowly cars were recalled so ‘most’ cars have the upgraded part number injectors, so this is not something we worry about too much now. It was only after the AA threatened VW with what is basically a UK Class Action Lawsuit that customers outside warranty were given goodwill and eventually free injectors. Not the best thing when you are stranded in the fast lane of the motorway. When they fail, the engine completely cuts out and won’t restart until a new/good injector is installed. As soon as cars were out of warranty customers were faced with £300 per injector failures that happened at very inconvenient times. When these cars were fairly new, the Siemens injectors failed regularly. The PPD engine run on a Siemens / Continental Injection and Management system. These share pretty much all of the hard engine components as the BKD, but both engines have totally different issues, especially when we begin to tune them. ![]() Over the past few years we have tuned a lot of PPD engines and suffered many problems along the way. ![]()
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