LIMP MODE

[Wilsoan]

wondering if someone can help with an issue i've got. cars not boosting right at all, won't hit limiter whistle driving and struggles to pull. goes into limp mode when i hit 60-70 but goes away when i turn car off and on, got all the boost pipes checked and welded and put back together and a new front mount intercooler. i had the water issue with the car since i've had it so got a pd150 engine dropped in it and hoped that would eliminate both problems, fixed the water issue as it was most likely the head. but got it back and it's still not boosting right and judders when i put the foot down and still going into limp mode. trying to find an n75 valve and the hoses for sale as the only thing that got changed what the engine block and head nothing else. what's people's verdict? and does anyone have n75 valve and hoses for sale? cheers boys x

[Ootohere]

Welcome to the forum.

If it is a Mk1 Fabia maybe best post in that section.

[MjClanger]

I've currently got the same problem on my Occy VRS. 

At the moment I've had a new pressure sensor fitted and Terraclean™ done. My mate hooked it to his VCDS and it showed no issues (or at least the fault codes didn't show up).

 The DPF showed 4% soot content, well within limits. 

  I'm a bit stuffed so it's going to skoda soon. 

I've  looked on the forum and it could be anything....from a sensor to swarf in the fuel system.

I'll update you soon. 

[KenONeill]

@Wilsoan - So, based on your post, it's got a 150 head, cam and injectors, but the original 130 map and ECU?

[sepulchrave]

It needs remapping if you have a PD150 turbo, they're different to the original turbo, the rest is all the same. A bit retarded changing the whole engine instead of just fixing the head gasket!

[KenONeill]

@sepulchrave - So I'm clear on this, you're saying that the peak duty cycle on the PD130 is so low that you're not bothering anything other than maybe air mass flow by turning it up to 1.15 of standard? That would explain a lot about the engine's apparent tuneability

[sepulchrave]

3 hours ago, KenONeill said:

@sepulchrave - So I'm clear on this, you're saying that the peak duty cycle on the PD130 is so low that you're not bothering anything other than maybe air mass flow by turning it up to 1.15 of standard? That would explain a lot about the engine's apparent tuneability

 

Most BLT PD130's make nearer 150 BHP as standard anyway but the PD150 turbo unit is actually larger and on a map designed for a 130 it will boost harder and trigger limp mode due to the ECU reading the MAP pressure as overboost, a simple remap will sort it out and also push power to about 190 BHP although it won't be useable for long before the standard intercooler heat soaks.

 

If you shove more air and fuel into any engine it will make more power, the PD130 is not as tuneable as the later 16V engines because inlet flow is restricted.

The golden rule is simple, the greater the inlet valve area available then the greater the power potential of any engine, petrol or diesel, turbo or not.