All Things Mk5 > Performance Modifications
Fuel pressure deficiency...
pudding:
Is the lpfp controller OEM or aftermarket?
Certainly looks like the problem is in the lpfp area, which I did steer you in the direction of in my first reply :smiley:
cupra_matt:
Hi.
I had exactly this problem with my GIAC stage 1+ map on my eddy. after 4K rpms it would loose power and torque. Its done this since i bought it.
I had it in R Tech yesterday for stage 2+ mapping and when Niki did the first run on the giac map it was requesting 110 bar and going dangerously lean, as a result of this the ecu was closing the throttle to try and richen itself up.
It had a correction factor of 25% and an injection time of 10ms. so very similar to yours.
At first niki thought it was a hardware fault, but he soon realised it was the GIAC mapping.
Stage 2+ completed i came away with 380 BHP and 405 lbs/ft and what feels like a new car. I cannot belive how bad the graph from the GIAC map was!!
So check your mapping before replacing any hardware!! I can almost guarantee its the map at fault.
Hope this helps.
pudding:
Blimey, that's a bit poo.
We had exactly the same issues with GIAC 10 years ago when their software came with US supplied supercharger kits for VR6s. Sh1t rich in part throttle, too lean in boost, and too much timing. I'm surprised they are still mapping in that way despite all the negative feedback over the years. Weird.
jhook661:
I'm having similar issues too I'm Revo stage 3 k04 conversion the car on full boost after 4K is dangerously lean so the ecu is pulling it back and mine has all new parts
Fuel filter 6.6 bar
Loba hpfp
Rs4 return valve
Brand new s3 injectors
No boost leaks or vacuum leaks either
Fuel pressure is good too
And top of all this the idle is shocking to it hunts and choughs but revs never drop or fluctuates :thinking:
Dan_FR:
If the fuel pressure is good then why are you running lean? Logs? You know the fuel request is adjustable, right?
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