a harsh lesson

[ARV_90]

^^

Fuel pressure is determined by your map. Increased pressure is requested when you increase load on the engine (ie put your foot down), and the pressure is adjusted as per the request. You can see the differences by logging on VCDS.

Generally at idle and light acceleration fuel pressure is low(er), and raises as you increase load with the accelerator pedal .

The fuel pump has a chamber which is filled with fuel and compressed by a piston which is powered by the follower. The higher pressure required means more fuel in the chamber to pressurise which takes more force to pressurise which in turn means more pressure on your follower.

There you go then ... the more power you request the higher the load.  

As to this problem only applying to engines that have been mapped or std that depends if the car you own has ever had a HPFP fitted in it's life.... how do you know as you see a lot of cars on here being "returned to std" to sell on .... nah then  

[ARV_90]

Little update whilst waiting for parts to arrive. I thought i may as well change the hpfp internals. Never done one before so i just downloaded the one from autotech. Now, looking at the new pump im thinking to myself where the fook do the collats go. Hmmmm lets see. Looks as if my cam has chewed the fecker up along with the spring retainer .

A quick pic with old at the side of new.



Notice how much of the fp it has eaten away.

 That my friend is Fu##ed ... did you manage to find the collets and end cap !!! Has it worn through the follower then ?

[gazon69]

Have you not seen the pic on page 1 ???

[ARV_90]

Have you not seen the pic on page 1 ???

My bad 

Oh my lord  what sort of HP are you running ? Looks like it has broken right where the collets fit, maybe a bit weak where it has been turned down.

Roller follower kit is the way to go I would imagine ... especially when running big Hp gains.

[vRSAlex]

Little update whilst waiting for parts to arrive. I thought i may as well change the hpfp internals. Never done one before so i just downloaded the one from autotech. Now, looking at the new pump im thinking to myself where the fook do the collats go. Hmmmm lets see. Looks as if my cam has chewed the fecker up along with the spring retainer .

A quick pic with old at the side of new.



Notice how much of the fp it has eaten away.

Good effort Gaz.  That has been running on the cam for quite a while then.  Never seen one that worn before.  So the retainer and the collets were missing?  I'm fooking shocked tbh.

All the stuff turn up ok today?

[ARV_90]

/\/\/\/\

I see... the end of the push rod had actually been running on the cam itself .... surprised it actually managed to make any fuel pressure at all..

I assume Mr vrs you have done a bit on the TFSI then ?

[vRSAlex]

/\/\/\/\

I see the the end of the push rod had actually been running on the cam itself .... surprised it actually managed to make any fuel pressure at all..

I think the main fault was low fuel pressure and going into limp mode.

[ARV_90]

/\/\/\/\

I see the the end of the push rod had actually been running on the cam itself .... surprised it actually managed to make any fuel pressure at all..

I think the main fault was low fuel pressure and going into limp mode.

I see.

Are there revisions on these cams then ? I think someone said the earlier engines had a narrow cam... if that is the case do you know when the revision took effect. be nice to know if mine was going to suffer eventually.

[bacillus]

Two revisions on the cam, the earlier A one that has "soft" lobes and the more robust and later B one.

[ARV_90]

Two revisions on the cam, the earlier A one that has "soft" lobes and the more robust and later B one.

I see, and at what year did the rev B appear.

[gazon69]

/\/\/\/\

I see the the end of the push rod had actually been running on the cam itself .... surprised it actually managed to make any fuel pressure at all..

I think the main fault was low fuel pressure and going into limp mode.

that was towards the end of its life that it was going into limp mode. It was actually still making decent power somehow. If it was as quick as it was with a fooked cam and f/p, daren't think what its gonna be like when its all fixed up. knowing the luck im having at the moment it'll prob bend a frickin rod.

[vRSAlex]

Two revisions on the cam, the earlier A one that has "soft" lobes and the more robust and later B one.

I see, and at what year did the rev B appear.

05, but the A cam has been found in 07 cars with the newer BWA engine code.  Nothing is consistent.

[E30Dom]

So not a case the internals are at fault/fitting of, that's caused such accelerated wear?

[woky]

can this wear happen in a standard car? i,ve had my 06 gti for 7 months now and i love it ! but all the probs i,ve been reading about on here makes me think have i bought the rite car ?

[MightyMullet]

can this wear happen in a standard car? i,ve had my 06 gti for 7 months now and i love it ! but all the probs i,ve been reading about on here makes me think have i bought the rite car ?

In the sameboat, always wanted one, looked for problems, bought a gti (1month ago), join forum, find out theyre a bit of a shed!