New HPFP

[GrayMK5GTI]

I'm no expert, but it looks like the pump is holding out fine, it's meeting its targets as far as I can see 

Have you done any other logs?

[Rob.]

Yeh, I recorded all the blocks outlined in the APR data logging page, so can post up whatever people think will be useful

I'm stumped by the boost logs I posted earlier...the Actual is well above the Specified.

[edd30]

What does Rtech say?

[GrayMK5GTI]

This may sound daft - but have you replaced your cam follower?

Looking at your logs, you need to find a straight stretch of bypass and do a full run through 3rd gear right through the rev range, as easing off and changing gear may be hiding the issue.

R-Tech are very helpful for troubleshooting, I had low pressure fuelling issues with my old K03 GTI and R-Tech altered the boost delivery to remove the issue

[Rob.]

I spoke to Ben a couple of days ago, but he hadn't had a chance to speak to Niki.

One downside of making a point of going to the best people in the business...is that they're 3hrs+ drive away from me! So I can't just pop round to speak to them.

Cam follower is fine - replaced it myself a few months ago, and inspected it again when I changed the fuel pump last week

[GrayMK5GTI]

I spoke to Ben a couple of days ago, but he hadn't had a chance to speak to Niki.

One downside of making a point of going to the best people in the business...is that they're 3hrs+ drive away from me! So I can't just pop round to speak to them.

Cam follower is fine - replaced it myself a few months ago, and inspected it again when I changed the fuel pump last week

Ah right ok.

If you can get some decent 3rd gear logs (following APRs guidelines) you can email them to Niki and he will tell you whats wrong.

If you are on facebook, join the "TFSI Tuning" group, its run by Niki and full of enthusiasts (loads of us from here on it). You can post your logs there and get suggestions 

[Rob.]

Here is something I overlooked before

http://wiki.ross-tech.com/wiki/index.php/16471/P0087/000135

I also had a reply from R-Tech outlining similar things, so I'm going to replace the fuel filter and see what I can find out about the G410 low pressure sensor too.

I replaced the cam follower at 70k, and the current one still looks spot on at 80k, so hoping the cam side of things isn't the issue.

Then I suppose if none of that works, I'll have to shell out for an uprated HPFP

[GrayMK5GTI]

When replacing the fuel filter, make sure you get the 6.6BAR filter rather than the 6.4BAR one 

[wayneitb]

This look more like a boast problem then a HPFP problem, I had the same thing happen to me on my 1.8T, turned out to be the N75 Valve, but the worst part about the problem was the valve did not trigger any error codes in VCDS, and was the last thing that got replaced.

[GrayMK5GTI]

This look more like a boast problem then a HPFP problem, I had the same thing happen to me on my 1.8T, turned out to be the N75 Valve, but the worst part about the problem was the valve did not trigger any error codes in VCDS, and was the last thing that got replaced.

The fault code he has is a fuel pressure related code though? 

[Rob.]

I've got a new 6.6bar fuel filter arriving tomorrow, so hopefully fit that this weekend. Might try TPS and see if I can get a G401 sensor too.

I took her for a spin yesterday...and the logs basically contradict the others I posted previously 

This is a 3rd gear pull, and it pulled hard right up to 6000rpm or so, then it felt like it hit a wall. You can see my full throttle input, yet the revs are dropping past 5000rpm. The rail pressure actual/specified difference increases past 3500rpm, yet the car still pulled hard...then after it broke, the rail pressures look evenly matched?!



This is a 4th gear pull a couple of minutes later. Foot nearly flat, but a huge difference in actual/specified rail pressure

[GrayMK5GTI]

Your logs are poor as youve let off the throttle, these logs only really work well if you keep your foot planted to the floor for the whole run.

The rail pressure request will be written into the map to maintain 120 bar from 3/4 load (or something like that).

See if the fuel filter makes a difference, then move onto the pressure sensor. There are loads of HPFPs on Ebay, it may be easier to just get one of those. . .