Fuel Pressure Reg setting?
#1
Fuel Pressure Reg setting?
Just had a fuelab fpr installed on the car and was told the standard pressure it has to be set at is 3bar,it has been set to this or just slightly under it but this is when the engine is on idle tick over,is this correct? as the pressure goes up above 3bar on the gauge when the accelorater is pressed.
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Depends on how much boost you intend to run, as the boost pressure is added to the base fuel pressure.
Circa 6.5 Bar total on a Fuellab IIRC
You need to be careful if running much over 3.5 bar (no Vacuum) static on stock rubber fuel lines.
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Ask Mark @ Lateral for a definative answer, but...
a - circa 470-480cc
b - circa 590-600cc IIRC
You'll reach a point where upping the pressure gives diminishing returns on flow..
Increased pressure will also make very slight changes to lag times, due to increased pressure on the fuel injector's operating valve
a - circa 470-480cc
b - circa 590-600cc IIRC
You'll reach a point where upping the pressure gives diminishing returns on flow..
Increased pressure will also make very slight changes to lag times, due to increased pressure on the fuel injector's operating valve
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Pinks are New Age 550 TFs, aren't they?
At 4-bar static, you're looking at around 'em flowing up to around 630cc, right? (certainly over 600cc). Surely that's enough for seeing up to 500bhp - maybe more?
Was it defo the pinks holding you back?
At 4-bar static, you're looking at around 'em flowing up to around 630cc, right? (certainly over 600cc). Surely that's enough for seeing up to 500bhp - maybe more?
Was it defo the pinks holding you back?
Last edited by joz8968; 19 January 2010 at 01:35 PM.
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it doesn't always work like that and what something will do on paper varies in practice sometimes.
Last edited by Jolly Green Monster; 19 January 2010 at 02:00 PM.
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What do mappers 'like' to achieve for IDC? (about 88-92% I think I've read, as posted by a specialist).
I think Simon told me you can run inj. at 98% IDC, if you really need/are 'forced' to! The available remaining 2% headroom is, allegedly, sufficient to cover any fuelling anomolies(?).
I think Simon told me you can run inj. at 98% IDC, if you really need/are 'forced' to! The available remaining 2% headroom is, allegedly, sufficient to cover any fuelling anomolies(?).
Last edited by joz8968; 19 January 2010 at 07:39 PM.
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ecu may want to add extra fuel under certain circumstances, but I'm not going to put my neck on the block....
( Add extra fuel as a coolant ? )
dunx
P.S. The reason I say this is that when std mine would heat soak the TMIC on a run and drink a positively scary amount of fuel, whilst getting slower and slower
( Add extra fuel as a coolant ? )
dunx
P.S. The reason I say this is that when std mine would heat soak the TMIC on a run and drink a positively scary amount of fuel, whilst getting slower and slower
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That's right - liquid (petrol in this case) obviously has fantastical heat exchaging properties, and adding extra fuel is probably THE best way of instantly combatting det due to that reason.
I'd love to know how the JECS ECU is programmed e.g. in the prescence of det, (and aside from first cutting boost) will it always add fuel first, or will it pull timing first... for example? Be interesting to know its programmed strategy...
I'd love to know how the JECS ECU is programmed e.g. in the prescence of det, (and aside from first cutting boost) will it always add fuel first, or will it pull timing first... for example? Be interesting to know its programmed strategy...
Last edited by joz8968; 19 January 2010 at 10:06 PM.
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it pulls timing via fine learn and coarse learn (advance mulitplier) and the advance map and then will add fuel via the high det fuel map and drop the boost once advance multiplier drops right down.
A car mapped properly should never do more than play with the fine learn imho, assuming ran on the same fuel it was mapped for.
Simon
A car mapped properly should never do more than play with the fine learn imho, assuming ran on the same fuel it was mapped for.
Simon
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Cheers Simon, that explains it then.
Is it a case of 'something's seriously wrong' if it pulls all the fine, then coarse, timing and thus getting into the fuel side of things, then? Or can that scenario happen for a number of reasons, and is therefore 'still okay'?
Is it a case of 'something's seriously wrong' if it pulls all the fine, then coarse, timing and thus getting into the fuel side of things, then? Or can that scenario happen for a number of reasons, and is therefore 'still okay'?
Last edited by joz8968; 19 January 2010 at 10:45 PM.
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should never happen on a car that is mapped properly.. and this is the OE ecus btw..
Obviously Apexi does none of that etc
Simon
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lol fair enough.
I suppose what I was trying to get at (badly) was, IF IT DID get into the high det fuel map (putting aside for one moment that it shouldn't), then will the engine be done for? How long can that situation go on for until dead engine? Or is that a factors-dependent, 'how long is a bit of string'-type question?
Or am I simply repeating myself?
(Yeah I know the PFC is fixed, etc. ).
I suppose what I was trying to get at (badly) was, IF IT DID get into the high det fuel map (putting aside for one moment that it shouldn't), then will the engine be done for? How long can that situation go on for until dead engine? Or is that a factors-dependent, 'how long is a bit of string'-type question?
Or am I simply repeating myself?
(Yeah I know the PFC is fixed, etc. ).
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lol fair enough.
I suppose what I was trying to get at (badly) was, IF IT DID get into the high det fuel map (putting aside for one moment that it shouldn't), then will the engine be done for? How long can that situation go on for until dead engine? Or is that a factors-dependent, 'how long is a bit of string'-type question?
Or am I simply repeating myself?
(Yeah I know the PFC is fixed, etc. ).
I suppose what I was trying to get at (badly) was, IF IT DID get into the high det fuel map (putting aside for one moment that it shouldn't), then will the engine be done for? How long can that situation go on for until dead engine? Or is that a factors-dependent, 'how long is a bit of string'-type question?
Or am I simply repeating myself?
(Yeah I know the PFC is fixed, etc. ).
It only takes fpr vac line to split or maf failure as two examples for it to go into that state.
The best solution is to manipulate these safety features in order to save the engine or at least give it a chance.
Hence timing is removed, fuel added and boost dropped.
Simon
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