But that would make sense Rob as the more off centre the sensor is the more correct the MAF editor software readings are because as you say it allows for it!
I don`t know but surely the larger BMW MAF is designed to work with it`s own more slender sensor in it`s centre......so really the nearer to the same shape as the original would be best, which is why i just suggested playing with the 850 sensor to allow it to get nearer the centre and also trim some plastic from it to make it more slender and as you say it would minimize turbulence of the measured air!
One thing seems definite ......the sensor is not accurately measuring the volume of air going past as the mix is lean!
Mercedes C320CDI Sport Estate 3 litre V6 7 Gear Auto
Remap 290bhp 628Nm torque @ 1600revs 45.1mpg
The scaling factor I mentioned was from here, page 10
http://www.paerl.it/volvo/Volvo%20Motronic%204.4.pdf
The BMW sensor is exactly the same as the Volvo one, the only difference is the plug. There are a number of people using this maf and table with no problems. Rob has a very odd issue. I would like him to get to the bottom of this, he has spent a lot of time on it. I can't see it, possible faulty ECU? I suppose its worth trying another.
1997 V70R FWD Manual
608 Modded ECU with Ostrich 2.0, COP Conversion, ITG Filter, 3.5" MAF, 3" intake, 18t turbo, Do88 Intercooler, RIP, 3" TB, 750cc EV14 injectors, AEM 320 Fuel Pump, 3" Cat back, Spartan2 Wideband
Lowered 40mm, Poly Subframe inserts
oblark (Sunday 20th July 2014)
1996 850 T5 AWD - Self tuned M4.4 ECU with COP`s, B5254T ( S60R internals in a 850 block ) ostrich 2.0 , VXR injectors @ 3.8 bar, K24 turbo with a 6+6 compressor wheel, 3.25" MAF, top mounted Dump Valve, RN Exhaust manifold, 3" downpipe with 200 cell cat, 2.75" Stainless exhaust, Brembo calipers, S60R brake discs, stainless RIP kit, 3" Throttle body,
The maf upper & lower tables didn`t match, thats why the logged values didn`t match the values in the maf table.
Thats that problem sorted on to the next, my LTFT_PL
My LTFT_PL is @+29.69 which is way to high, I`ve tried all different values but with no joy.
I know I was adding to much fuel as the car back fired everytime I changed gear.
Will get they in the end
Last edited by oblark; Tuesday 22nd July 2014 at 20:42.
1996 850 T5 AWD - Self tuned M4.4 ECU with COP`s, B5254T ( S60R internals in a 850 block ) ostrich 2.0 , VXR injectors @ 3.8 bar, K24 turbo with a 6+6 compressor wheel, 3.25" MAF, top mounted Dump Valve, RN Exhaust manifold, 3" downpipe with 200 cell cat, 2.75" Stainless exhaust, Brembo calipers, S60R brake discs, stainless RIP kit, 3" Throttle body,
claymore (Tuesday 22nd July 2014)
claymore (Tuesday 22nd July 2014)
After going through a load of data logging, text files and xld files I thing I've found the problem.
Now I dont want to tell how I've come to this conclusion as it is complicated and it will go straight over your heads
but I need a new fuel filter.
1996 850 T5 AWD - Self tuned M4.4 ECU with COP`s, B5254T ( S60R internals in a 850 block ) ostrich 2.0 , VXR injectors @ 3.8 bar, K24 turbo with a 6+6 compressor wheel, 3.25" MAF, top mounted Dump Valve, RN Exhaust manifold, 3" downpipe with 200 cell cat, 2.75" Stainless exhaust, Brembo calipers, S60R brake discs, stainless RIP kit, 3" Throttle body,
Well I`ve changed the fuel filter and guess what still the same, So I`ve done some testing with different injectors/maf`s. The idea is to get the LTFT_PL to be as close to zero as posible on idle and while driving.
Whites with 3.25 maf @ idle
Whites with 3.25 maf driving
Whites with stock maf @ idle
Whites with stock maf driving
So the problem looks like it`s the 3.25 maf/maf table. I`m going to send the white/stock maf bin file to Piet who is goin to convert it to run the 3.25 maf as something is wierd is going on with my maf table convertor software.
1996 850 T5 AWD - Self tuned M4.4 ECU with COP`s, B5254T ( S60R internals in a 850 block ) ostrich 2.0 , VXR injectors @ 3.8 bar, K24 turbo with a 6+6 compressor wheel, 3.25" MAF, top mounted Dump Valve, RN Exhaust manifold, 3" downpipe with 200 cell cat, 2.75" Stainless exhaust, Brembo calipers, S60R brake discs, stainless RIP kit, 3" Throttle body,
MoleT-5R (Monday 28th July 2014)
Yep, seems that way.
Hopefully Piet can get the right values for you.
1996 Olive Green 850 AWD - Follow the Project - Forged rods, 19T, big blue injectors, 960 TB, 3.25" MAF, Ostrich, 608 binary, arduino data display, active exhaust control with Focus RS tips, 320mm front brake conversion.
1996 Nautic Blue 850 AWD - Failed its MOT, now it's a donor for the green thing.
2004 Sapphire Black S60 D5 - The new daily hack.
Still want the squirters checked Rob?
19t, greens, 3" inlet, 3" downpipe with race cat, V70R catback, autotech map...
310.2bhp / 333ft/lb
2016 Swedish Day UK "Best Modified Swede"
SOLD
Got an old discovery now.
well at least you found whats bugging it up,good news
full respray..plenty of body mods..comets..ray cat back noise pipe..decat and wrapped downpipe..me7 exhaust manifold..3" throttle body with ported inlet manifold..blue injectors..adjustable fuel reg..reverse intercooler pipework..19t..open cone air filter..255 fuel pump..m-r-p short shift..boost gauge..unknown remap..adjustable suspension..lightweight crank pulley..n/a cams..stripped out interior..and a heavy right foot
1996 850 T5 AWD - Self tuned M4.4 ECU with COP`s, B5254T ( S60R internals in a 850 block ) ostrich 2.0 , VXR injectors @ 3.8 bar, K24 turbo with a 6+6 compressor wheel, 3.25" MAF, top mounted Dump Valve, RN Exhaust manifold, 3" downpipe with 200 cell cat, 2.75" Stainless exhaust, Brembo calipers, S60R brake discs, stainless RIP kit, 3" Throttle body,
On Piet`s recomemdation I`ve checked the sensor too housing fit.
Sorry for the picture quality as they where taken on my phone.
I discovered that the 850 (right) sensors o ring is 6mm from the flange and the BMW (left) sensors o ring is 10mm from the flange.
Also the BMW maf housing has a 6mm deep chamfer whilst the volvo one only has a 2mm chamfer.
BMW maf housing.
Volvo maf housing.
So the o ring on the 850 sensor is not sealing againt the BMW housing as it sits where the chamfer is, to overcome this little problem I`ll get a thicker o ring tomorrow from work.
Then I`ll refit the maf with Piet`s bin file.
1996 850 T5 AWD - Self tuned M4.4 ECU with COP`s, B5254T ( S60R internals in a 850 block ) ostrich 2.0 , VXR injectors @ 3.8 bar, K24 turbo with a 6+6 compressor wheel, 3.25" MAF, top mounted Dump Valve, RN Exhaust manifold, 3" downpipe with 200 cell cat, 2.75" Stainless exhaust, Brembo calipers, S60R brake discs, stainless RIP kit, 3" Throttle body,
Dangerous Dave (Monday 28th July 2014),theflyingbrick (Monday 28th July 2014)
Hmm, so it may be leaking then
1996 Olive Green 850 AWD - Follow the Project - Forged rods, 19T, big blue injectors, 960 TB, 3.25" MAF, Ostrich, 608 binary, arduino data display, active exhaust control with Focus RS tips, 320mm front brake conversion.
1996 Nautic Blue 850 AWD - Failed its MOT, now it's a donor for the green thing.
2004 Sapphire Black S60 D5 - The new daily hack.
1996 850 T5 AWD - Self tuned M4.4 ECU with COP`s, B5254T ( S60R internals in a 850 block ) ostrich 2.0 , VXR injectors @ 3.8 bar, K24 turbo with a 6+6 compressor wheel, 3.25" MAF, top mounted Dump Valve, RN Exhaust manifold, 3" downpipe with 200 cell cat, 2.75" Stainless exhaust, Brembo calipers, S60R brake discs, stainless RIP kit, 3" Throttle body,
slightly would be enough to cause grief on a standard tune so i reckon itll cause havoc on yours!!
full respray..plenty of body mods..comets..ray cat back noise pipe..decat and wrapped downpipe..me7 exhaust manifold..3" throttle body with ported inlet manifold..blue injectors..adjustable fuel reg..reverse intercooler pipework..19t..open cone air filter..255 fuel pump..m-r-p short shift..boost gauge..unknown remap..adjustable suspension..lightweight crank pulley..n/a cams..stripped out interior..and a heavy right foot
The o ring on the 850 sensor is 3mm, so I`ve fitted a 4mm and its sealed the sensor to the housing.
The first picture is the 850 o ring and sensor, the second picture is the with the 4mm o ring, it pulled in nicely when the screws where done up.
I`ll go for a drive later on once the rush hour traffic has died down and report back
1996 850 T5 AWD - Self tuned M4.4 ECU with COP`s, B5254T ( S60R internals in a 850 block ) ostrich 2.0 , VXR injectors @ 3.8 bar, K24 turbo with a 6+6 compressor wheel, 3.25" MAF, top mounted Dump Valve, RN Exhaust manifold, 3" downpipe with 200 cell cat, 2.75" Stainless exhaust, Brembo calipers, S60R brake discs, stainless RIP kit, 3" Throttle body,
claymore (Tuesday 29th July 2014)
1996 850 T5 AWD - Self tuned M4.4 ECU with COP`s, B5254T ( S60R internals in a 850 block ) ostrich 2.0 , VXR injectors @ 3.8 bar, K24 turbo with a 6+6 compressor wheel, 3.25" MAF, top mounted Dump Valve, RN Exhaust manifold, 3" downpipe with 200 cell cat, 2.75" Stainless exhaust, Brembo calipers, S60R brake discs, stainless RIP kit, 3" Throttle body,
wow thats a big difference!! just a little leak huh? glad you sorted it mate
full respray..plenty of body mods..comets..ray cat back noise pipe..decat and wrapped downpipe..me7 exhaust manifold..3" throttle body with ported inlet manifold..blue injectors..adjustable fuel reg..reverse intercooler pipework..19t..open cone air filter..255 fuel pump..m-r-p short shift..boost gauge..unknown remap..adjustable suspension..lightweight crank pulley..n/a cams..stripped out interior..and a heavy right foot
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