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Author Topic: MED9 HPFP & LPFP Control  (Read 53440 times)
BenR
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« on: November 13, 2013, 06:26:41 AM »

Hi Guys,

Ive seen a bit of chat around regarding this but no solid information supporting it so thought id start something.

HPFP
When a bigger pump is used we bump up the rail pressures under HDRPSOL. There are rail pressure maps for Homogenous Operation, Knock Protection, Lean Protection, Cat heating.There is also a maximum rail pressure limit map. X axis is RPM and Y axis is 'indexed Driver torque limit before change" which i dont fully understand but it seems to work like most other load vs rpm scaled maps.

There is also VHDP which is pump volume. For example the OEM on a 2.0tfsi is 251mm^3. Many tuners change this map when the HPFP is upgraded. Ive heard of 300mm^3 for an APR pump. Whats the formula behind this?

LPFP
Generally you dont need to touch this but once you're using bigger turbos you have 2 choices. Either change the hardware to something that is hardwired to flow more or change the software. It seems the hardware option is easier.
Maps i have found are:

KFNTBKS "Target pressure as a function of temperature HDP"
KLPSKRMX "Characteristic set pressure fuel low pressure system maximum"

I am about to do some testing on these maps and will report back my findings.

So if anyone is using the OEM LPFP module on a bigger turbo (2867, 3071, 3076) you will see your lpfp drop to 2.5bar once you start making half decent power. The question is how can we demand more fuel? Im confused in how the above to maps will help that as they're not requesting a certain pressure. I will however report back when i have more info, or if someone else does. Feel free to chime in.

Cheers

« Last Edit: November 13, 2013, 06:30:09 AM by BenR » Logged
RaraK
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« Reply #1 on: November 18, 2013, 01:55:57 PM »

Your stock controller of mk5 gti and similar will usually overheat if you demand much out of a pump.

You must hardwire or upgrade to a better lpfp controller of the TTRS maybe.
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mec
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« Reply #2 on: November 18, 2013, 02:45:01 PM »

I'm running an rs4 lpfp controller on my a4, with stock pump and so far it has been way more than enough. When I installed it I did nothing to the lpfp maps, and I was seeing 6.1bar at idle, high 5's even at WOT. Then I adjusted the target pressure maps, now I Idle at 4.1bar and at WOT at 6000 RPM I am around 3.3-3.4bar. Not sure if you can use it. Otherwise the Boost Manager plus is also a cool solution, my friend had it on his car and you can program the lpfp maps, manage boost profiles, and control meth all from one device.
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BenR
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« Reply #3 on: November 18, 2013, 06:03:41 PM »

I currently use a TTRS HPFP on smaller turbo cars. Say GTX2867. It seems to hold well at 25psi to 7000rpm. Even after requesting higher pressures through the correct maps the TTRS pump is ok for 30psi on GTX3071.
I use the RS4 controller and TTRS pump but i believe you do not need to controller and it can be done through the correct maps. Has anyone done this?
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RaraK
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« Reply #4 on: November 18, 2013, 09:09:40 PM »

BenR -

Controller is needed for upgrade, it will overheat on road race or high speed runs for sure at high duty.  I have done this on multiple setups and had to use an uprated rs4/ttrs lpfp controller to resolve the issues.

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BenR
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« Reply #5 on: November 18, 2013, 09:18:46 PM »

Rarak,

Thank you for the response. This is why i havent overheated yet. I will make sure the other cars use the module also.

I am yet to re flash my car but i was getting fault codes from this module. "Out of specified limit" I think after adjusting some maps i can get rid of this. Or maybe turn off the diagnostics/fault codes for the LPFP?
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hammersword
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« Reply #6 on: November 25, 2013, 06:11:39 PM »

I use stock controler with TTRS/RS3 pumps.

The only need is to recalibrate the controler's DC.
I did a GTX3071R last days and at 8200RPM I had 3.6bar @ 2bar boost with 84%DC
If you don't recalibrate well the controler then you will face an engine shut off at high speeds...

About the HPFP there are more maps like piston diameter, piston surface etc
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TCSTigersClaw
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« Reply #7 on: November 27, 2013, 04:17:13 AM »

MED is so complicated ,but its worth it !

Thanks Fotis
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BenR
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« Reply #8 on: November 28, 2013, 03:39:36 PM »

I dont like using the modules from different cars, too many other problems like waking it up when you open the door etc.

Ive found all the DC tables so should be able to get the OEM module to behave at high power with just the TTRS pump.
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Beaviz
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« Reply #9 on: December 01, 2013, 01:43:43 PM »

About the HPFP there are more maps like piston diameter, piston surface etc

Hi Fotis

I am trying to figure this out as well. Are you talking about RQUAHDPK and VHDP? I am reading through the same pages in the FR over and over again without any luck. Huh
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hammersword
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« Reply #10 on: December 01, 2013, 05:41:48 PM »

you got it. Some of the maps are these... try to fingure more maps
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Beaviz
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« Reply #11 on: December 02, 2013, 01:12:33 PM »

you got it. Some of the maps are these... try to fingure more maps

I think I have figured out a bit more tonight.

I guess that these are the maps:
Map:
RQUAHDPK
SKHDPMX
VHDP
Description:
HPFP piston radius/area
Maximum compression limit of the HPFP piston
Total volume of the HPFP
Stock value:
16.0 mm2
5.0 mm
251.2 mm3

The calculation for VHDP seems to be: RQUAHDPK * pi * SKHDPMX (I wonder why VHDP it is actually defined as a map)

If the information I have found on the internet for aftermarket pumps are correct (assuming all have the same piston surface!), RQUAHDPK is changed to 24.0 mm2. If I input that into the formula above VHDP now = 376.8 mm3.

Is all this correct? I am only talking about calibration here - not changing the rail pressure.
« Last Edit: December 04, 2013, 12:02:12 PM by Beaviz » Logged
Beaviz
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« Reply #12 on: December 04, 2013, 10:57:31 AM »

Still trying to figure this out. Huh Grin

Is VGESAPP the last map that I need?
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B234R
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« Reply #13 on: December 04, 2013, 11:43:52 AM »

VGESAPP is only used on application mode, not in the normal calculations.

For the rest you are on the right way...
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Beaviz
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« Reply #14 on: December 05, 2013, 01:51:18 PM »

Thanks! I see about the application mode after reading closer.

How many maps am I missing? Just a hint would be nice... Smiley
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