Quick 1.8T VAG question..

[Skiddley]

LCR..'05

Had to pick the lady up last night and was in a hurry so spanked it over to her mates house.

Pretty sure I hit a bump in the road that caused the front wheels to momentarily lift off the ground and spin up. When they landed i heard a noticeable hiss.

From that point on, the engine sounds like it's farting air, coming from the engine bay, left hand side (as you look at it) from what i can tell. The farting obviously increases in frequency\volume when you push the accelerator. Assuming some kind of split hose?

No engine management light, seems to be down on power.

Oops. I'm either several days out of warranty, or have a few days left. Any ideas?

 

[paradigm]

Sounds like you've dislodged or split an intercooler hose. You need to take the undertray off to see though.

 

[Skiddley]

Dropped it off at the dealers on the way to work. Warranty expires on 27th May - result

Thanks for the heads up.

 

[Toker]

or maybe split boost pipe, do you feel like you're down on power?

edit: oops just noticed you did say you feel down on power

my money is on the boost pipe

 

[Rwac]

Probably worth looking into extending the warranty either with the dealer or with a third party company like warranty direct - only if you intend to keep it for a while that is

 

[Skiddley]

Yea - I think it's boost related too - but would have expected the management light to come on in that case?

And no - not keeping it - selling it or donating it to the Mrs in Aug as I've got a porka on the way.

 

[Firestar_3x]

If the car detects a boost drop or overboost it will go into limp home mode, however as i found out yesterday the car can go into limp home mode and display no lights on the dash....

How kind of it!

 

[Skiddley]

It was quite embarrassing actually, cruised home at barely 30mph as I didn't want to push it and going over 2.5K makes the locals stare from the 'put put put put put' noises .

A Nissan Micra overtook me

 

[Toker]

yea that can be the danger of remapping 1.8t's, limp mode and/or boost spikes... n75j valve with a parallel mbc sorts that out

 

[Skiddley]

It's bog standard.

 

[Toker]

yea that was O/T, my money is still on a split boost pipe for you - my mate had that once with no engine management lights or anything in the dash

 

[Firestar_3x]

yea that can be the danger of remapping 1.8t's, limp mode and/or boost spikes... n75j valve with a parallel mbc sorts that out

Yeps, adjust the boost the N75 actually sees

Mine is boosting to 12.5psi so at a guess at some point its spiked to 14psi and its gone, no....

 

[Toker]

yea there are some good graphs people have produced comparing standard/mbc only/n75j only/n75j and mbc, the boost spikes seen with only the n75j can be quite scary :O

 

[Skiddley]

So presumably, if you're spanking it anyway (it was being floored from 20-60mph), then you get some frontal air = instant high revs = boost spike?

 

[Dogbreath]

yea there are some good graphs people have produced comparing standard/mbc only/n75j only/n75j and mbc, the boost spikes seen with only the n75j can be quite scary :O[/img]

2 PSI overboost is scary? Pah, the Fiat was spiking up to 1.5 BAR with the stock factory solenoid bleed valve (runs at 1.0 BAR nominal).

 

[Firestar_3x]

The red line is exactly what mine does, climbs up to a peak of 12.5psi at around 3.5k then starts dropping down till its only holding 5psi towards the redline.

I don't really get a steady amount of boost through any part of the rev range (so to speak), would be nice to either replace my N75 for a better version or fit a bleed valve.

 

[Toker]

2 PSI overboost is scary? Pah, the Fiat was spiking up to 1.5 BAR with the stock factory solenoid bleed valve (runs at 1.0 BAR nominal).

na that wasnt a scary example, just the first one i saw which shows what the parallel n75j and mbc do

but the main problem with 1.8t's and boost spikes is the fact the engines go in to limp mode if there's too much overboost

 

[Skiddley]

Anyway, it was dropped off unannounced at the dealer. Said they'd try and fix it today so might get a call. Hopefully it'll get done by the w/e or I have to drive oop north, in the heat, in the MX-5 ... doh.

 

[Toker]

ah well good luck, i'm sure it's nothing to worry about as by the sounds of the event the boost pipe or another pipe of some sorts will just have split/have a leak/become dislodged so it'll be a cheap easy fix providing the dealer mechanic isn't a total monkey

 

[Griffo]

I think it was my N75 valve that split so I got intermittent boost, mainly in 3rd. Not sure of the relevance hah. Anyway yes, sounds like a split pipe. The error code/engine warning light thing is annoying as, it can light up for something stupid, and not light up for something serious. Also Skoda can find "no error codes sorry" yet Awesome can find "oh yeah there's an error about that door lock" no problem.