2.0tfsi HPFP Specifications?

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Bad Ash
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2.0tfsi HPFP Specifications?

Post by Bad Ash » Fri Feb 16, 2018 11:29 pm

Hi Guys

Anyone know the maximum fuel pressure that can be generated from a stock Hitachi HPFP (mk5 gti/mk6r/s3 8p).
And what sort of pressure gains should be expected from aftermarket upgrades.
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Re: 2.0tfsi HPFP Specifications?

Post by vwpro » Sat Feb 17, 2018 6:55 am

standard and upgrade can deliver the same pressure, the volume of the upgrade is more. The relieve valve on the rail determined the pressure
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Re: 2.0tfsi HPFP Specifications?

Post by Bad Ash » Sat Feb 17, 2018 3:41 pm

How would one know if their hpfp is stock or upgrade without physically stripping the pump? Ive been led to believe that logging fuel pressures might give some insite depending on the tune as the stock hpfp can only request a maximum pressure of 'x' amount.
Guys with a stage 2 tune should be at that maximum pressure as 2+ requires hpfp upgrade
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Re: 2.0tfsi HPFP Specifications?

Post by BdtDSG » Sat Feb 17, 2018 8:35 pm

Bad Ash wrote:How would one know if their hpfp is stock or upgrade without physically stripping the pump? Ive been led to believe that logging fuel pressures might give some insite depending on the tune as the stock hpfp can only request a maximum pressure of 'x' amount.
Guys with a stage 2 tune should be at that maximum pressure as 2+ requires hpfp upgrade
Get someone with vcds to log group 230. Stock pump sits aroud 109 bar and will drop in the midrange under WOT. Upgraded pump should keep up with the requested rail pressure.

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Re: 2.0tfsi HPFP Specifications?

Post by panic-mechanic » Sun Feb 18, 2018 9:48 pm

just strip it if you want to know.
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Re: 2.0tfsi HPFP Specifications?

Post by Bad Ash » Mon Feb 19, 2018 5:11 pm

Logged a WOT in 3rd gear. The requested in the midrange is 120+ bar. The actual matches that all the way to redline.
What are the physical differences between the stock hpfp internals vs upgraded? On autotechs website they talk about 9.8mm vs 8mm stock. Are they talking about the diameter of the piston.
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Re: 2.0tfsi HPFP Specifications?

Post by BdtDSG » Mon Feb 19, 2018 5:30 pm

Bad Ash wrote:Logged a WOT in 3rd gear. The requested in the midrange is 120+ bar. The actual matches that all the way to redline.
What are the physical differences between the stock hpfp internals vs upgraded? On autotechs website they talk about 9.8mm vs 8mm stock. Are they talking about the diameter of the piston.
Larger diameter piston as well as larger cylinder sleeve to accommodate the piston. If it's an autotech it will have the logo on the sleeve as well. Image

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Re: 2.0tfsi HPFP Specifications?

Post by Bad Ash » Mon Feb 19, 2018 6:41 pm

BdtDSG wrote:
Bad Ash wrote:Logged a WOT in 3rd gear. The requested in the midrange is 120+ bar. The actual matches that all the way to redline.
What are the physical differences between the stock hpfp internals vs upgraded? On autotechs website they talk about 9.8mm vs 8mm stock. Are they talking about the diameter of the piston.
Larger diameter piston as well as larger cylinder sleeve to accommodate the piston. If it's an autotech it will have the logo on the sleeve as well. Image

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Shot boet. Guess the fool proof way would be to strip the pump. The 122bar at midrange could be software maxing the stock pump.
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Re: 2.0tfsi HPFP Specifications?

Post by Tander » Wed Feb 21, 2018 9:13 am

Bad Ash wrote:
BdtDSG wrote:
Bad Ash wrote:Logged a WOT in 3rd gear. The requested in the midrange is 120+ bar. The actual matches that all the way to redline.
What are the physical differences between the stock hpfp internals vs upgraded? On autotechs website they talk about 9.8mm vs 8mm stock. Are they talking about the diameter of the piston.
Larger diameter piston as well as larger cylinder sleeve to accommodate the piston. If it's an autotech it will have the logo on the sleeve as well. Image

Sent from my SM-G935F using Tapatalk
Shot boet. Guess the fool proof way would be to strip the pump. The 122bar at midrange could be software maxing the stock pump.
For interest sakes, I used a stock internal on my HPFP last month. I was getting 130bar no problem. But I have an upgraded return vale (RS4 one) so that may have contributed to it. Car now has the auto tech internals back in and getting 130+ on the fuel rail.

As Stephan says; the sure way is to just strip and check. Its literally a 10 min job.

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Re: 2.0tfsi HPFP Specifications?

Post by BdtDSG » Wed Feb 21, 2018 1:14 pm

Tander wrote:
Bad Ash wrote:
BdtDSG wrote:
Bad Ash wrote:Logged a WOT in 3rd gear. The requested in the midrange is 120+ bar. The actual matches that all the way to redline.
What are the physical differences between the stock hpfp internals vs upgraded? On autotechs website they talk about 9.8mm vs 8mm stock. Are they talking about the diameter of the piston.
Larger diameter piston as well as larger cylinder sleeve to accommodate the piston. If it's an autotech it will have the logo on the sleeve as well. Image

Sent from my SM-G935F using Tapatalk
Shot boet. Guess the fool proof way would be to strip the pump. The 122bar at midrange could be software maxing the stock pump.
For interest sakes, I used a stock internal on my HPFP last month. I was getting 130bar no problem. But I have an upgraded return vale (RS4 one) so that may have contributed to it. Car now has the auto tech internals back in and getting 130+ on the fuel rail.

As Stephan says; the sure way is to just strip and check. Its literally a 10 min job.
Depends on the software as well. The hpfp pressure will start to drop if the pump can't provide enough flow, which usually happens in the midrange on remapped cars, otherwise there would be no need for the HPFP upgrade.
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Re: 2.0tfsi HPFP Specifications?

Post by Bad Ash » Wed Feb 21, 2018 11:24 pm

Yeah shot guys. Will strip and check. Thanks for the info. I get more out of here then all the other conflicting info available online. I was led to beleive that the stock pump can pump a max of 110bar in the midrange regardless of rs4 valve. Ive now learnt its actually software dependent and the stock pump can be pushed upto 130bar.
''I spent alot of money on booze, birds and fast cars. The rest I just squandered...''
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