RomRaider

Has this been confirmed as the correct table for A4TF520F? I have edited the defs with the above and the tables populate with Idle 33.33 and Cruise 66.67.

I have this light throttle stumble that is driving me bonkers.

Confirmed correct values

Thank you! Really appreciate the feedback. Now it's time to see if that helps

finally solved, thankd td-d and all
my posts in page 9
problem is stumbling at 2800-3600rpm with id1000 injector, afr up to 18 in a grf
tried up fuel pump duty to 100%, failed
tried adjust per injector BPW compensation, improved but not solved
saw another thread , increase fuel line length (mechanically) to 90cm long, solved
thanks, i love romaider

yes forget to cross reference the thread

viewtopic.php?f=15&t=4911&start=255
page 18 onwards

A8DK100V = 3a424

OK, I am new to this romraider stuff but have building and tuning cars for over 20yrs so please don't stone me.

I stumbled across this thread while looking for something else and I have read the past ten pages in this thread and after the first page started wondering why we don't just hard wire the pump with a relay?

Every aftermarket pump I have ever used uses the Fuel as a coolant. So using a duty cycle to make the pump work hard at a slower speed seems like it would induce heat build up and premature pump failure.

I think it's safe to assume that if you have an aftermarket fuel pump you also have an aftermarket FPR. to regulate it.

So what is the problem with having the pump run at full voltage and regulate the Fuel pressure with the FPR?

your aftermarket injectors were flow tested at 43.5psi Fuel pressure.

Why does this have to be so complicated?

Again if I am totally missing something here please tell me.
Fueling in my mind is pump-controlled by regulator -injector duty cycle controls actual engine fueling. The fuel pressure at the injectors is controlled by the regulator. The pump is only moving Fuel from the tank to the injectors. So the pump should be on at full voltage all the time. The injectors are in charge of Fuel delivery to the cylinders via Fuel pressure, injector size - duty cycle and pulse widths.

So why not hard wire the pump, turn off the code asking for pump duty cycle and focus on dialing in the fueling via the injectors?

maybe because using fuel pump duty cycle is the elegant way, without wiring and stuff..and is also more flexible - you can use 100% duty cycle all the time if you want or you can use different duty cycles when required ...

Actually a lot of people can manage a stock FPR on aftermarket fuel pumps no issue. By running it full ball generating 250+LPH at idle, yes you are using the fuel as a coolant but that heat energy has to go somewhere... the fuel

Fuel Temp Sensor in the fuel tank measures that change and adjusts the final pulsewidth accordingly(most of the fuel temp sensor scalings are missing from definitions)

Its the equivalent of matching fuel flow to the engines actual demands. You have less fuel being heated/pressurised and then being returned to the fuel tank where it then heats the rest of the fuel in the tank. That excess fuel flow is then also heated by the engine bay and that creates a LOT of in tank fuel vapour.

I tested it on my own car, tested the pump duty values with all being 100% Vs stock values on a stock fuel pump... guess which got worse fuel economy figures? High flow pump on full ball at low pulsewidth was the worst fuel economy despite the final injection pulse being similar.

Current run a Magnaflow 1500Hp external pump with surge tank, fed by a pump in stock location. The in tank FP Duty is at stock % in both of the adjustable values simply as I have no 'pressure' in the surge tank so it flows an insane amount of flow at 0psi.

Can someone help please with the A4RN300G ROM? I try to find the mentioned hex for the 16 bit ecu but got only crap, when put the found address to the xml.

1D98B is CRUISE

1D9AD is IDLE

Thx for the fast response.
Thats really weird but I found the same address for CRUISE and get the value 170 in ecuflash. For IDLE i got 66 so it´s properly CRUISE?

I put the following lines to the A4RN300G.xml for testing:

<table name="Fuel Pump Duty CRUISE" category="Fuel Pump" address="1D98B" type="1D" level="1" scaling="rawecuvalue" description="TEST 1"/>
<table name="Fuel Pump Duty IDLE" category="Fuel Pump" address="1D9AD" type="1D" level="1" scaling="rawecuvalue" description="TEST 2"/>

Do I something wrong?

Use the xml templates provided on this thread rather.

Ah, ok thx, I do it a wrong.

But the right address for IDLE is 1D99D.

So for A4RN300G ROM:

into the "A4RN300G.xml":

<table name="Fuel Pump Duty (Idle)" storageaddress="1D99D" />
<table name="Fuel Pump Duty (Cruise)" storageaddress="1D98B" />

into the "16BITBASE.xml":

<table name="Fuel Pump Duty (Idle)" category="Fuel Pump" type="2D" level="2" scaling="Duty Cycle">
<description>This will set the desired Cruise FP duty during Idle conditions.</description>
<table name="Idle Duty" type="Static Y Axis" elements="1">
<data>Fuel Pump Duty During Idle Conditions</data>
</table>
</table>

<table name="Fuel Pump Duty (Cruise)" category="Fuel Pump" type="2D" level="2" scaling="Duty Cycle">
<description>This will set the desired Cruise FP duty during cruising conditions.</description>
<table name="Cruise Duty" type="Static Y Axis" elements="1">
<data>Fuel Pump Duty During Cruise Conditions</data>
</table>
</table>



Thx for help!

Anyone got these for A4TH100H?

DONT WORRY Found them.


<table name="Fuel Pump Duty (Idle)" address="e777">
</table>

<table name="Fuel Pump Duty (Cruise)" address="e765">
</table>

Thanks