All Things Mk5 > Performance Modifications
Bluefin Stage 2 too much boost .. not enough fuel pressure?
Mark_GTIV:
Hi there,
During this phase of fuel pressure drop in the high torque zone, timing goes down to a steady +3, fuel pressure is fluctuating all over the place, but on average a 20BAR less than requested.
The car goes from feeling strong with a nice consistent surge to a slight feeling of alternating gentle reining in during the 3750 rpm through 4300 rpm, then it comes strong again and then the same feeling as it passes peak power in the 5300-5500 rpm range. - I only feel this if I'm doing a wide open throttle pull in 6th gear starting at 2000 rpm.
Last week, it threw a DTC code P0087 Lower limit fuel pressure intermittent in the Engine ECU at 3200 RPM with WOT in 6th gear and the car did an enforced throttle reduction.
So, I think, perhaps because of the Forge unit (I'm running the stronger spring), in my particular case, the bluefin programming will need it's requested boost toned down by 0.1 or 0.2 BAR to stop it 'over boosting' and maintain fuel pressure in this danger zone. I suppose they programmed stage 2 for a normal diaphragm valve with the only hardware change expected being a hi-flow cat and down-pipe.
I'm going to have a conversation with SC on Monday.
haithame:
i have the same problem and i have P0087 - 002 - Lower Limit Exceeded - Intermittent
i contacted Superships many times trying to solve that...they tried to send me several files trying to reduce the boost BUT NOTHING WORKS....by the way i am using the factory dump valve
Mark_GTIV:
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.
vRStu:
I think you are showing classic signs of fuel cut. Upgrading the fuel pump internals would solve the problem or going back to Stage 1 software.
Mark_GTIV:
--- Quote from: vRStu on May 31, 2009, 07:11:43 pm ---I think you are showing classic signs of fuel cut. Upgrading the fuel pump internals would solve the problem or going back to Stage 1 software.
--- End quote ---
Yup I do too. My achieved boost is usually 0.3 BAR boost above requested, so if they crank it down a notch I think it will be fine.
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