Rail pressure too high

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Audi-RS6-R
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Rail pressure too high

Post by Audi-RS6-R » Fri Apr 28, 2017 2:54 am

Hey guys...

We (my tuner & me) have a problem with high rail pressure (Upgrade-HPFP)
It won't let regulate down...the pressure is always on maximum...

We tried other Upgrade HPFP from a working car setup, tried other ECUs, changed high pressure sensors..

No chance - always the same on my plus...other cars are working with that mapping & setup, but mine does not - too rich and too much pressure on high rpms :cry:

Someone an idea??

Greetz Flexx
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Farravi
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Re: Rail pressure too high

Post by Farravi » Fri Apr 28, 2017 7:54 am

Oh this is beyond my pay grade , however Ian might be of help. I'm sure he's lurking around somwhere on the forum.


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FUBAR
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Re: Rail pressure too high

Post by FUBAR » Thu May 25, 2017 11:22 pm

If you have the possibility, get bigger injectors. There has been alot of failures and problems with HPFPs.
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Re: Rail pressure too high

Post by Audi-RS6-R » Thu May 25, 2017 11:26 pm

Bigger ones with OEM Pumps --> new mapping

or

OEM new ones with Upgrade Pumps?
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Re: Rail pressure too high

Post by FUBAR » Thu May 25, 2017 11:41 pm

Bigger injectors with OEM pumps. You will need a new MAP. Do not have part numbers for the bigger injectors, but I think they are from the Porche parts bin.
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Re: Rail pressure too high

Post by Audi-RS6-R » Thu May 25, 2017 11:48 pm

I have since a couple of days massive problems at acceleration from low rpms - strange noise from exhaust like a lot ignition failures.
Spark plugs etc. all new...now I think it must be the injectors...

BTW.: I am on OEM pumps in the moment...
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kent_andy
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Re: Rail pressure too high

Post by kent_andy » Fri May 26, 2017 7:26 am

i remember Brett had an issue when he switched to a LOBA HPFP on his 900 bhp RS6. MRC advised the standard ones are more than up to the job and no need to change to HPFP, pretty sure classba ran a standard fuel pump on his too
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Trups
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Re: Rail pressure too high

Post by Trups » Fri May 26, 2017 8:21 pm

Classba's has HPFP, I'm sure they say APR on them.
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Re: Rail pressure too high

Post by FUBAR » Sat May 27, 2017 11:10 pm

APR has stoped doing them....
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Re: Rail pressure too high

Post by Audi-RS6-R » Sun May 28, 2017 10:48 am

I changed yesterday all 10 injectors...(here the 5 of bank 1) :shock: :shock:

Car is running again...no ignition failures etc.
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Re: Rail pressure too high

Post by Ungjaevel » Sun May 28, 2017 8:56 pm

Clogged due to poor fuel quality?
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Re: Rail pressure too high

Post by Audi-RS6-R » Sun May 28, 2017 9:00 pm

No.. Never other fuel as 102 oct
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IanH755
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Re: Rail pressure too high

Post by IanH755 » Sun May 28, 2017 9:01 pm

Wow that's bloody terrible!!!

I'm glad it's all sorted but what the hell has gone wrong for that sort of damage to occur????
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Re: Rail pressure too high

Post by Audi-RS6-R » Sun May 28, 2017 9:11 pm

Man, I don't know.... :(
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Re: Rail pressure too high

Post by rs6_sid » Sun May 28, 2017 11:22 pm

They can cause ring landing failures if they fail. I was going to send mine away to get serviced and new seals
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