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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8051   
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what sort of bhp are you pushing? we ran a highly tuned td5 that didnt have issues with stand alone aftermarket electric fuel pump to meet demand. Cheers
James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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28th Jul 2020 4:22pm |
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| Naf Member Since: 07 Dec 2016 Location: Sandbox Posts: 412  
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I am somewhere in the clouds above 250 but below 300.
The bosche 044 pump flows more than the stock pump. By removin the air i am also makin the mixture more predictable and with an extra fuel cooler, i should see better overall performance. Can't leave well enough alone |
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28th Jul 2020 4:27pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8051
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ours was a tad over 250, measured. I can't recall aftermarket pump. But had that and no i tank pump.
Be warned, engines don't last long. Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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28th Jul 2020 9:14pm |
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| bankz5152 Member Since: 02 Feb 2017 Location: South London/North Kent Posts: 2173 
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Sure its not your tank? Getting fuel starvation? Instagram @defender_ventures
Empire Tuning - Agent |
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29th Jul 2020 6:41am |
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| Naf Member Since: 07 Dec 2016 Location: Sandbox Posts: 412
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I like to keep the fuel levels above 1/2 a tank.
I also have a fuel pressure sensor on the line before the regulator on the head. So I have an accurate reading of what is there. I played with the fuel regulator. I installed one with a pressure nipple and bumped up the pressure so it would hold more pressurized fuel, but it didn't help. It was just as erratic but at a higher pressure. Can't leave well enough alone |
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29th Jul 2020 6:51am |
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| Naf Member Since: 07 Dec 2016 Location: Sandbox Posts: 412
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More frequent oil changes, better oil coolin, and lots of 2T oil. 3ml per ltr of fuel.
Keeps mine runnin fine. Can't leave well enough alone |
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29th Jul 2020 4:31pm |
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| mturri Member Since: 13 Jul 2010 Location: All over Posts: 33 
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A healthy stock fuel pump outputs 180 litres/hour (HP stage) which should be more than enough flow rate wise. High flow is primarily needed so that the regulator can choke it so as to create the necessary back pressure for efficient injector fuel fill. Note that the regulator is actually downstream of the fuel rail, though it's location and the fact that it acts both as a fuel entry & exit point makes things rather confusing. Td5 injectors have an ultimate injecting capability of 90 mg/stroke, with an operating maximum (Td5 EMS) of 50-55 mg/stroke as out of factory. At peak power theoretical fuel intake is about 280 grams/min so roughly 0.33 litre/min ~ 20 litre/hour (very debatable finger math based on achievable engine speed versus driver demand and ignoring all limiters so actual figure should be significantly less). That's roughly 10% of fuel pump delivery capacity and a full tank in a little over 3 hours... some serious fuel burning!
Have experimented with 5 and 6 bar FPR inserts and did not experience any measurable performance gains (EBP/EGT). Fuel temperature helps optimise atomisation which in turn maximises thermal efficiency so unless suffering from specific fuel heating issues (e.g. climate derived) decreasing fuel temperature will not do much for performance, perhaps even the opposite. IQ is mass based and that is what the inlet fuel temperature sensor is for. If fuel too cold EMS derates IQ to keep emissions at bay. If fuel too hot IQ is capped accordingly. If fuel pressure erratic would suggest to check fuel pump current draw waveform, potentially bad section on commutator or even armature shorting, not necessarily indicative of impeding pump failure but may explain pressure swings & performance issues. 24 yrs of Td5 ownership D110 Td5 MY06 fully tuned up ex-D2 Td5 MY04 Auto ex-D110 Td5 MY00 ex-D2 Td5 MY00 ex-D2 Td5 MY99 ex-D1 300Tdi MY89 ex-D90 200Tdi MY87 |
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4th Aug 2020 2:16am |
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