So whats this the fuel cut at 12psi?
How do you get around it?
Or is it something more drastic than that?
So whats this the fuel cut at 12psi?
How do you get around it?
Or is it something more drastic than that?
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.
no not yet, i've got to get bigger injectors (currently running at 99.7% injector duty) so i'll get one fitted as soon as i get some sorted
tbh i can't remember what spec BT had got at the time, the benefit of the reverse flow would of helped itWhat sort of extra cooling did you use to keep the Turbo from getting to hot?
Last edited by p fandango; Sunday 22nd February 2009 at 13:55.
Anyone know how the ecu knows its at 12psi? Or is it the knock sensors that trigger the fuel cut?
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.
ECU calculates boost pressure from throttle position and air temp sensor and MAF reading.
So is the fuel cut bad for the engine?
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.
its there to protect your engine so not exactly bad, but once you've hit it you'll know how aggressive it is & won't want to hit it constantly for your own pleasure. Mine was set so close that any excess load would cause it to cut in, if i wanted to floor it i had to throw it down 2 gears
boost cut is normally around 15psi
855 rica 304bhp, Adjusted Wastegate, Bleed Valve, ITG Panel Filter, 171k fsh, Volvo Strutt Brace, Polybush Topmount , 4mm Samco Vacuum Hoses, 10 Core "Racing" Ht Leads, 302mm Volvo Discs under 16" Columba Alloys, Performance DS2500 Fronts Red Stuff Rears, Drillled Airbox, 5w/40 Oil Changed @ 5k intervals,
764 B230ET 108k FVSH No mods yet...Planning underway.....
Dum Spiro Spero
VOC 850/70 Register Keeper
VOC 20419
Hey Duane...
Currently i am getting a compitant 19 psi using the back of a Rica with a MBC (yes all those years you have been on at me)....Not a hint of cut, strong but quick boost....AFR is good..I expect there is a little to play with...Running 15g and stock zorst too...
Best
Jod
855 rica 304bhp, Adjusted Wastegate, Bleed Valve, ITG Panel Filter, 171k fsh, Volvo Strutt Brace, Polybush Topmount , 4mm Samco Vacuum Hoses, 10 Core "Racing" Ht Leads, 302mm Volvo Discs under 16" Columba Alloys, Performance DS2500 Fronts Red Stuff Rears, Drillled Airbox, 5w/40 Oil Changed @ 5k intervals,
764 B230ET 108k FVSH No mods yet...Planning underway.....
Dum Spiro Spero
VOC 850/70 Register Keeper
VOC 20419
Hi Mate, hows things?
well what can i say, MBC is the way to go lol. Always looks good seeing the needle go off the clock, i haven't tried it with the speedo yet tho lol. Have managed to find the higher boost cut off the ECU yet, just interested how much higher it is than standard? Are T-5's dar to run or what, i notice neither of us have got any fuel lol
take it easy mate
Hi Duane...
The car was supposed to run a pressure of 9.x psi, which allegedly crept up to around the halfway mark on the instument panel dial....I never owned a new one so i cant collabourate this, however alot of the 850 i have found myself involed
with are only producing around 6psi which is really only about a third of the scale in my experience...The reasons for this are more likely to be down to bolt ons rather than the engine itself....
I like to keep the tank empty as i am working on a less weight/more speed theory..lol
I would expect that a stock car would be able to make 10psi with a peak to 13 without hitting ignition cut....
Best
Jod
855 rica 304bhp, Adjusted Wastegate, Bleed Valve, ITG Panel Filter, 171k fsh, Volvo Strutt Brace, Polybush Topmount , 4mm Samco Vacuum Hoses, 10 Core "Racing" Ht Leads, 302mm Volvo Discs under 16" Columba Alloys, Performance DS2500 Fronts Red Stuff Rears, Drillled Airbox, 5w/40 Oil Changed @ 5k intervals,
764 B230ET 108k FVSH No mods yet...Planning underway.....
Dum Spiro Spero
VOC 850/70 Register Keeper
VOC 20419
I was refering to ambient air temp sensor. - i am aware the 70's use the sensor mounted in the front bumper, and the 850's the one within the MAF.
And yes, the ECU does derive boost pressure- thats how it knows how much to modulate the BCS according to its look-up tables.
855 rica 304bhp, Adjusted Wastegate, Bleed Valve, ITG Panel Filter, 171k fsh, Volvo Strutt Brace, Polybush Topmount , 4mm Samco Vacuum Hoses, 10 Core "Racing" Ht Leads, 302mm Volvo Discs under 16" Columba Alloys, Performance DS2500 Fronts Red Stuff Rears, Drillled Airbox, 5w/40 Oil Changed @ 5k intervals,
764 B230ET 108k FVSH No mods yet...Planning underway.....
Dum Spiro Spero
VOC 850/70 Register Keeper
VOC 20419
Indeed, which is why i said "the ecu calculates boost pressure from..." !
Just an Update....
Had to move the mbc from its position on the upper engine mount bracket, as the mbc was getting very hot with the heat from the engine, etc (not that it matters, but just in case) and adjusting it was a nightmare as it was burning my fingers. I have a strut brace, so i've relocated it on that above the abs unit (see pic) and its much cooler now.
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.
sounds like a well worth while investment ,.. dude whats the silver box,.. catch tank??
Past
95 854 2.5 10v with b5254t conversion...RIP,
96 850 awd...cut up RIP,
95 965 manual!..parted out,
94 855 T5 green..scrapped RIP,
94 855 T5 red..heart lives on body RIP,
03 S60 D5 sold
94 855 glt 2.5 10v white parted out RIP
97 V70 AWD parted out RIP
Present
93 854glt 2.5 20v (turbo)white daily project
04 s60 D5 (literal twin of previous s60)
yep, its actually a 'catches bloody everything' tank, as there's so much ££££e that comes out when I empty it, mostly its water and oil mix.
I was an reading EPE magazine from November 2008, and they've got a DIY circuit that you can fit into the line between the ECU and the BCS to variably control boost via a variable resistor mounted on the dash. Basically it intercepts the signal from the ecu to the BCS and delays it a bit.
They also had a fuel cut bypass module to build too, but it works off the input from a MAP sensor, and our cars aren't fitted with those.
Last edited by Dangerous Dave; Thursday 5th March 2009 at 19:13.
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.
Yeah, I thought that too, its there for a reason innit. Best not to mess too much.
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.
yes indeed
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