Fuel Pumps
Re: Fuel Pumps
Exactly what I was looking for to get the full picture! Shopp already provided the second one :
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Fuel Pumps
Yeah, so you can see that if there's a failure with the PCV valves then you could easily get some cross talk between the banks 1 and 2 inlet at the compressors. Same for the N80 / ACF circuit Where did you find a French version of that document?!
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: Fuel Pumps
Yes, exactly! I also think the blue non return valve on the first pic may also need some attention. As per this vendor on eBay, it is well known for failing : https://www.ebay.fr/itm/VW-AUDI-SEAT-SK ... 2950924975
Full French version is here :http://www.forum-audi.com/topic-237-aud ... esses.html
Loads of useful and detailed information about the car, with very clear explanations and pics!
Full French version is here :http://www.forum-audi.com/topic-237-aud ... esses.html
Loads of useful and detailed information about the car, with very clear explanations and pics!
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Fuel Pumps
Huh. Interesting. Think I'd stick with OE, personally, so as not to multiply the unknowns.Classik wrote: ↑Tue May 21, 2019 8:26 amYes, exactly! I also think the blue non return valve on the first pic may also need some attention. As per this vendor on eBay, it is well known for failing : https://www.ebay.fr/itm/VW-AUDI-SEAT-SK ... 2950924975
Cool. Thanks. PDF here:Classik wrote: ↑Tue May 21, 2019 8:26 amFull French version is here :http://www.forum-audi.com/topic-237-aud ... esses.html
Loads of useful and detailed information about the car, with very clear explanations and pics!
http://docplayer.fr/79306165-Service-au ... terne.html
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: Fuel Pumps
Great, thanks! And well noted your recommandation to stick with the OE version. 
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Fuel Pumps
Just received the parts today, namely PCV valves (034129101C) & non-return valve (035103245A) so I started to unmount all those hoses for proper clean-up.
Look at all this crap, no wonder the engine was not happy:
Hopefully I should come back shortly with good news. Otherwise I'll have to open the intake manifold to change the jet succion (venturi) pump and clean-up the mess..
Look at all this crap, no wonder the engine was not happy:
Hopefully I should come back shortly with good news. Otherwise I'll have to open the intake manifold to change the jet succion (venturi) pump and clean-up the mess..
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Fuel Pumps
That looks like your car’s been smoking 80 a day for the last few years.
You got service history for it? Has it been serviced on mineral oil?
You got service history for it? Has it been serviced on mineral oil?
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: Fuel Pumps
Tell me about it! Unfortunately no, I don't have the full history. I can only say that since I have it (2 years by now) it has been only treated with 5W40 either Castrol Edge or Motul 300V
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Fuel Pumps
Well, I was expecting to come back with good news, but even after cleaning the hoses, changing the PCVs (034129101C) & non-return valve (035103245A), I still get the same MAF discrepancies. 
As shown by this small extract from a log tonight (still some traffic so couldn't push the engine), the discrepancy can be as high as 100% difference.
As shown by this small extract from a log tonight (still some traffic so couldn't push the engine), the discrepancy can be as high as 100% difference.
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Fuel Pumps
Looks like it’s under all boost conditions, too. I’m assuming the turbos got spooled up somewhat.
Things left to try/possibilities:
swapping MAF connections L/R to eliminate wiring / ECU.
N80 non-return valves
Wastegate pre-load balancing
Smoke / pressure test
Exhaust / cat blockage
N75 plumbing / hoses
Things left to try/possibilities:
swapping MAF connections L/R to eliminate wiring / ECU.
N80 non-return valves
Wastegate pre-load balancing
Smoke / pressure test
Exhaust / cat blockage
N75 plumbing / hoses
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: Fuel Pumps
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: Fuel Pumps
Thank you Shopp, very grateful, although I must confess I'm getting VERY frustrated about all this.
I'll follow your list and report accordingly!
Regarding the turbos, I don't know how important that may be, but during my last VCDS log I also checked the Boost Pressure (specified) and Boost Pressure (actual) values. Very surprinsingly the former value (specified) [edit : almost] always stays constant (1000mbar) whereas the later follows the car boost. To my understanding the specified value is the target which should be followed as closely as possible by the actual pressure, am I correct?
I'll follow your list and report accordingly!
Regarding the turbos, I don't know how important that may be, but during my last VCDS log I also checked the Boost Pressure (specified) and Boost Pressure (actual) values. Very surprinsingly the former value (specified) [edit : almost] always stays constant (1000mbar) whereas the later follows the car boost. To my understanding the specified value is the target which should be followed as closely as possible by the actual pressure, am I correct?
Last edited by Classik on Sat May 25, 2019 11:44 pm, edited 1 time in total.
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Fuel Pumps
I'm not sure I understand what you mean about the boost. The actual should always follow the specified as closely as possibly. Obviously, sometimes it takes time for the turbo to spool up so you can't get the specified boost very quickly at low revs, for example.
Can you post up some logs of your boost, specified and actual against rpm?
Can you post up some logs of your boost, specified and actual against rpm?
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
Re: Fuel Pumps
Here's an extract of the measurements. I need to check if there is a 'fast' mode for the measurements sampling rate on the mobile version of VCDS as the time resolution is quite low...
Please remind me not to post too quickly and double check my findings first
Actually the specified boost is not always constant as I thought initially but almost always constant except when pressing real hard on the pedal (full throttle in the above case for the first bump). What surprises me most is the second bump on the graphic ^^ where you can see a decent (actual) pressure increase with barely any changes on the specified boost. Is that the normal behaviour?
BTW, if we can trust the values, the graphic says the max measured (actual) pressure is around 1900mbar which sounds quite good to me. Could that rule out any air leak, at least up to where the pressure sensor is (=just before the throttle body)?
Please remind me not to post too quickly and double check my findings first
Actually the specified boost is not always constant as I thought initially but almost always constant except when pressing real hard on the pedal (full throttle in the above case for the first bump). What surprises me most is the second bump on the graphic ^^ where you can see a decent (actual) pressure increase with barely any changes on the specified boost. Is that the normal behaviour?BTW, if we can trust the values, the graphic says the max measured (actual) pressure is around 1900mbar which sounds quite good to me. Could that rule out any air leak, at least up to where the pressure sensor is (=just before the throttle body)?
RS6 C5 Avant 2003 Daytona Grey
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Loba 650 turbos - Wagner IC - 200 cells cats - Milltek cat-back - Hotchkis bars - Bilstein B16 - MTM Wheels - oem coolant cap
Re: Fuel Pumps
There’s a bit of a lag after the request for full boost. Might be normal. Hard to tell from the scale of the time axis.
The blip where the revs rise but the demand is zero is a bit odd. Could point to sticky waste gate / incorrect pre-load. Or it could be a normal occurrence. I’ll check my old logs.
Actually, you can see that the request does rise slightly. I bet that your sampling rate is giving a granularity that doesn’t show the peak demand at that point which is probably much higher than the graph shows. You need to sample in turbo mode.
Certainly the graph doesn’t suggest a massive boost leak, but those turbos can move a lot of volume so a leak big enough to cause mixture issues might not be obvious. Also, your problem could easily be an internal leak so that total volume of air is metered, just going to the wrong bank.
Remind me what your trim values are doing?
The blip where the revs rise but the demand is zero is a bit odd. Could point to sticky waste gate / incorrect pre-load. Or it could be a normal occurrence. I’ll check my old logs.
Actually, you can see that the request does rise slightly. I bet that your sampling rate is giving a granularity that doesn’t show the peak demand at that point which is probably much higher than the graph shows. You need to sample in turbo mode.
Certainly the graph doesn’t suggest a massive boost leak, but those turbos can move a lot of volume so a leak big enough to cause mixture issues might not be obvious. Also, your problem could easily be an internal leak so that total volume of air is metered, just going to the wrong bank.
Remind me what your trim values are doing?
Daytona RS6 C5 Avant. Viper'd, Billies, Waggers, MTM box brain, C6 stoppers, xcarlink, R8 coolant cap (woohoo)
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
///M3 E46 | XC90 (V8, natch) | Passat GTE | RR Classic V8 flapper
"The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at and repair."
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