Fuel enough for two!
Discussion
Just took delivery of this handsome collection of fueling components today. Should see me to 600HP and beyond and then some. The Procharger project is moving along. Won't make it in time for stoneleigh 
but maybe end of May to early June. The quality of these parts is excellent. The parts are two low pressure pumps, one high pressure pump, two 100 micron filters, one 10 micron filter, one Y block and one fuel pressure regulator. The regulator pressure will rise 1:1 with my boost pressure. I bought them direct from the US. I collect the injection system on friday
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Regards Dave
www.v8yes.co.uk
but maybe end of May to early June. The quality of these parts is excellent. The parts are two low pressure pumps, one high pressure pump, two 100 micron filters, one 10 micron filter, one Y block and one fuel pressure regulator. The regulator pressure will rise 1:1 with my boost pressure. I bought them direct from the US. I collect the injection system on friday. Regards Dave
www.v8yes.co.uk
Maybe a silly question but why do you want the regulator pressure to raise with the boost pressure, sounds like an outdated way of doing things ???
Surly a 4D Map will take care of the boost pressure, by altering the fuel manifold pressure your making the Map more complicated are you not ??? the Last thing you want is trouble with fuel pressure and running Lean when on Boost....
>> Edited by gtrclive on Tuesday 28th February 21:32
Surly a 4D Map will take care of the boost pressure, by altering the fuel manifold pressure your making the Map more complicated are you not ??? the Last thing you want is trouble with fuel pressure and running Lean when on Boost....
>> Edited by gtrclive on Tuesday 28th February 21:32
Hi Clive
I will see how things go when I start maping. Need to find out if I have the capacity in the injectors to keep the fuel pressure static at the base pressure (44psi). High flow injectors are not great at idle speeds so I'll just have to wait and see. The 65lbs injectors should be good up to 730HP.
Regards Dave
>> Edited by CanAm Dave on Tuesday 28th February 23:01
I will see how things go when I start maping. Need to find out if I have the capacity in the injectors to keep the fuel pressure static at the base pressure (44psi). High flow injectors are not great at idle speeds so I'll just have to wait and see. The 65lbs injectors should be good up to 730HP.
Regards Dave
>> Edited by CanAm Dave on Tuesday 28th February 23:01
gtrclive said:
Surly a 4D Map will take care of the boost pressure, by altering the fuel manifold pressure your making the Map more complicated are you not ??? the Last thing you want is trouble with fuel pressure and running Lean when on Boost....
Not sure what you mean. Are you talking about a dead-headed setup with the fuel pump pushing into the fuel rail with a pressure sensor regulating the pump via a PWM controller? I thought that was still fairly complex stuff these days.
Vac/boost related regulator may be old hat but its very simple (it makes the fuel sums a ton simpler) and well proven.
Clive
Here is an extract from the MegaSquirt site:
"If you were to 'cap off' the manifold vacuum port on the fuel pressure regulator, you are reducing the dynamic range of the injectors. This means you will need lower pulse widths at (giving less control over idle mixtures) and lower flow under boost (restricting the maximum horsepower)"
It does seem a pretty normal mechanism, and as I think it suggests you can get away with running larger injectors but at idle run with a lower (than base) fuel pressure so that there is more control over the injector duration (ie it can be longer).
Phil.
Here is an extract from the MegaSquirt site:
"If you were to 'cap off' the manifold vacuum port on the fuel pressure regulator, you are reducing the dynamic range of the injectors. This means you will need lower pulse widths at (giving less control over idle mixtures) and lower flow under boost (restricting the maximum horsepower)"
It does seem a pretty normal mechanism, and as I think it suggests you can get away with running larger injectors but at idle run with a lower (than base) fuel pressure so that there is more control over the injector duration (ie it can be longer).
Phil.
A 1:1 regulator is completely correct. What you are doing is keeping the pressure differential between the manifold and fuel pressure the same. So when the the manifold is in what we term vacuum (or under ~14psi) the pressure is reduced and when you increase the manifold pressure above ~14psi (what we call boost) the fuel pressure needs to be raised to compensate - at a 1:1 ratio. so for every 1 PSI of boost, your fuel pressure goes up by 1 psi also. (or a 3bar fuel rail will be a 4bar when running 1 bar[14psi] of boost).
You may be thinking of rising rate regulators (non 1:1 ratio), which was raised the fuel pressure at a higher rate in order to richen the mixture whilst the ECU was unaware of 'boost' - which is a bit of a bodge (but worked well for many people)
>> Edited by eliot on Wednesday 1st March 09:01
You may be thinking of rising rate regulators (non 1:1 ratio), which was raised the fuel pressure at a higher rate in order to richen the mixture whilst the ECU was unaware of 'boost' - which is a bit of a bodge (but worked well for many people)
>> Edited by eliot on Wednesday 1st March 09:01
davefiddes said:
Surly a 4D Map will take care of the boost pressure, by altering the fuel manifold pressure your making the Map more complicated are you not ??? the Last thing you want is trouble with fuel pressure and running Lean when on Boost....
Not sure what you mean. Are you talking about a dead-headed setup with the fuel pump pushing into the fuel rail with a pressure sensor regulating the pump via a PWM controller? I thought that was still fairly complex stuff these days.
Vac/boost related regulator may be old hat but its very simple (it makes the fuel sums a ton simpler) and well proven.
No.. feed in though a "Y" fitting to both Rails then a Regulator connected to the other ends with a return to the tanks, but keeps a constant fuel pressure...
I See how a lower fuel preesure at idle would make sence with Big injectors, but a Hayabusa with 4 x 1000cc injectors seems to run fine on tickover and still rev to 12,000 and have over 600 bhp... So 8 injectors with say 650cc should be enough for most of us ( Gman may be the exception )...
But as they say there plenty of ways to Skin a Cat... oops thats upset the RSPCA....
I'll ask my Motorsport friend and see what the boys that know seem to say....
Dave what Ampage are all those pumps, Am using 2 intank low pressure/high flow pumps, and 2 Bosche Motorsport high pressure pumps out of the swirl pot... But thats 5 amps each suction and 15 amps for each high pressure pumps.....
All together thats nearly 40amps when there all running.. with that and the EWP thats 50amps... I have had to fit a bigger alternator to account for al these..
Just a note might be worth counting up your loads.....
All together thats nearly 40amps when there all running.. with that and the EWP thats 50amps... I have had to fit a bigger alternator to account for al these..
Just a note might be worth counting up your loads.....
I see what you mean. Just don't vacuum/boost reference the fuel pressure. I'm with Eliot/Phil on that. On a road vehicle you want to do that. If you don't then you wont get the dynamic range out of the injectors to give a smooth idle and not run out of flow at the high end. The motorsports guys don't bother because they run lairy big cams that can't supply a decent vac reference (assuming NA) and to be honest they couldn't give a stuff about idle qualilty or part throttle fuel consuption...which we care about a lot.
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