All Things Mk5 > Performance Modifications
Bluefin Stage 2 too much boost .. not enough fuel pressure?
Hedge:
I would have thought your N75 would be taking care of any excess boost. :confused:
haithame:
--- Quote from: Mark_GTIV on May 31, 2009, 06:14:36 pm ---Yeah I read your story with your conversation with the guy from australia on mkvgolf.
I think my problem is a little different from yours, because when I read your story, your fuel pressure requested versus achieved was inconsistantly variable all the time, whereas mine is only inconsistantly variable on high load, in a specific series of RPM where boost is excessive (i.e. 1.43 BAR).
At anything lower than 1.4 BAR boost, my fuel pressure is perfect. I'm going to ask SC to scale back the requested boost in the danger zone, so that the car will only achieve less than 1.4 BAR boost in those areas and then I think it will be fine - I'll let you know how I get on.
--- End quote ---
my fuel pressure is inconsistent in the range of 4k rpm not all the time
Mark_GTIV:
--- Quote from: Hedge on May 31, 2009, 07:27:53 pm ---I would have thought your N75 would be taking care of any excess boost. :confused:
--- End quote ---
The wastegate actuator is used to keep the turbine in it's efficiency envelope and stop it over-reving and it's controlled by the mapping - When SC tweak the boost mapping, the ECU will use the wastegate actuator to control the turbo according to the map. In other words the N75 will do whatever the map tells it to do, and right now SC are asking for 1.4 BAR... which is the issue.
Mark_GTIV:
--- Quote from: haithame on May 31, 2009, 07:36:34 pm ---
--- Quote from: Mark_GTIV on May 31, 2009, 06:14:36 pm ---Yeah I read your story with your conversation with the guy from australia on mkvgolf.
I think my problem is a little different from yours, because when I read your story, your fuel pressure requested versus achieved was inconsistantly variable all the time, whereas mine is only inconsistantly variable on high load, in a specific series of RPM where boost is excessive (i.e. 1.43 BAR).
At anything lower than 1.4 BAR boost, my fuel pressure is perfect. I'm going to ask SC to scale back the requested boost in the danger zone, so that the car will only achieve less than 1.4 BAR boost in those areas and then I think it will be fine - I'll let you know how I get on.
--- End quote ---
my fuel pressure is inconsistent in the range of 4k rpm not all the time
--- End quote ---
oh really.. what are the boost readings when the fuel pressure goes strange?
john_o:
have you have checked that you arent due the Fuel Pressure Sensor recall (not that I think its an issue here)?
reading your comprehensive reply. Im surprised your fuel press actual is ABOVE your requested.
forge shouldnt have an effect under WOT and you are achieving requested boost levels.
I assume you have tried going back to stage 1 (which the bluefin will allow) and the fault doesnt occur ?
FP looks ok in rest of range but have you checked your cam follower?
may also be worth changing your in tank fuel filter too?
the question in my mind would be why SC map is requesting a boost level the car (in good working order) cant achieve :surprised:
either that or dropping the boost is just a band aid to hide an issue you havent found yet...
at the end of the day vrstu's the expert :wink:
(the other contraversial option given the way the bluefin maps are uploaded , in theory you could reflash to stock and get a stage 2 REVO or APR trial and see if it exhibits the same issue))
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