123tom123tom Posted January 21, 2008 Author Share Posted January 21, 2008 anyone or do you think i have it susst with dodgy fpr....answers on the stock fpr question Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted January 21, 2008 Share Posted January 21, 2008 Well it sounds to me like you don't have enough fuel pressure, which is why its going so weak, however it could also be the reverse ie too much fuel, as for the stock FPR, its simply a spring loaded diaphragm that responds to pressure/vacuum, so if it receives a little more pressure it just allows a couple more PSI on a 1.1 basis, but it does have a limit which is why some people replace it with and adjustable one, if there is the need to run much larger injectors, which don't atomise very well at lower fuel pressures/RPM/DC. The system is not just reliant on fuel pressure to provide the correct mix at 1.2 BAR its down to the injector duty cycle controlled by the ECU, which in turn is told where in the load/boost scale the engine is at on the ECU map. Quote Link to comment Share on other sites More sharing options...
123tom123tom Posted January 21, 2008 Author Share Posted January 21, 2008 right so going on what you said, as long as i stick to 1.2 bar and dont go any further in modifying boost, turbos etc and put the stock fpr back on when i get one it should run fine at 1.2 bar on stock ecu/injectors, as it did before i went bpu, the problem seems to have accured after putting the fpr and double decat on and the reason for it cutting out is definatley it going lean on start up as the aem gauge tells me that.. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted January 21, 2008 Share Posted January 21, 2008 You did try adjusting the FPR ?? and yes with std FPR at 1.2 you should be OK, but i would be inclined to run 1.1 as you are starting to run out of the std turbo efficiency range at 1.2 and the injectors will be pretty much at full DC. Quote Link to comment Share on other sites More sharing options...
123tom123tom Posted January 23, 2008 Author Share Posted January 23, 2008 would me tapping into the vac hose that goes to the fpr effect anything,,,,for my boost gauge. Quote Link to comment Share on other sites More sharing options...
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