Restoring a Cheap Audi TT - pt 4: Boost Issues and PCV Removal

Welcome back to our channel! In this episode of our Audi TT restoration project, we're tackling some boost issues that have been plaguing the car. We'll show you how we diagnose the problem and walk you through the process of removing the PCV and fitting a catch can to help prevent future issues. As always, we'll share our tips and tricks for working on cars and give you a behind-the-scenes look at the challenges and triumphs of car restoration. Join us as we work to bring this old Audi TT back to life, one step at a time. Don't forget to like and subscribe to our channel for more updates on this project and other car-related content!
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[@xo7966]

The max PSI is 15psi on a stock tune for the 225. Depending on what diverter you have, it can fail in few different ways, If it's a spring type (after market) it will either seize open or close. If it seizes open you will build little to no boost. If it seizes closed you will be dumping excess boost into the compressor wheel and you will hear alot of turbo flutter. If you have the diaphram style and if fails (tears) you will have issues hitting peak boost and holding. If you have a vacuum leak and you don't have a pump or smoke tester go ahead and replace anything that looks crusty. It's seems to me like your car may be flashed. If you were over boosting (20psi) you would hit boost cut, and the car will go into limp mode, and you won't be able to boost past 5 psi. Also, you should have between about 20 inches of vacuum. Check the hard line for the break booster and the black vacuum check valves as well.

[@duanefry3360]

Excellent video mate! Clear explanation. I got pretty much all I needed from this & got a couple clear screen shots

[@valveauto]

Glad you found it useful thanks for following.

[@RS-ci3eu]

Tidy work! That boost to 20psi does seem wild! I have every faith you'll find the issue. Didn't realise you were planning on going to the ring with it one day, can't wait to see it all built up slapping round the nordschleife!

[@flippingcars101]

Good video and very clean work, keep up the good work

[@tots_mk1_225]

Around 15 PSI max is correct for standard 225, mine peaks at 15 (probably just under as the gauge probably is 100% accurate).

[@Al-qv5vs]

Good video. Good info. Thinking of doing the catch can mod mysel.

[@julesmatthews2178]

Just for reference if it boosts strong I suggest it’s possibly got a stage 1 map.. stock 225s are flat 👍

[@willcarson5444]

Acid test !!! Could you explain please?

[@julesmatthews2178]

Have you got any warning lights on the dash? And also Have you got a smooth idle ? Ideally you need to run VCDS it will bring any codes up 👍

[@julesmatthews2178]

@@valveauto eml could be a 02 sensor going bad there’s 2 on 225s .if it is always buy BOSCH sensors nothing else .

[@julesmatthews2178]

@@valveauto esp light could be a few things MAF sensor brake pressure sensor ABS sensor . If you plug it into a diagnostic tool it will tell you And cylinder 2 could be a faulty coil pack .. check for any oil around the rocker gasket as there very common to leak 👍

[@julesmatthews2178]

@@valveauto that snapped plastic crank case breather on yours it’s very common for that part to fail .. give us shout if you need any advice 👍

[@julesmatthews2178]

@@valveauto also check the half moon seal that can be done same time as rocker gasket .. something else too that leaks that’s the seals on the injectors 👍

[@julesmatthews2178]

@@valveauto the injector seals are only made of rubber. There tiny think there’s 2 seals per injector 👍

[@keithriley3159]

Oh wow ! I only live around the corner from you, have you seen a silver TT in the village, thats me.

[@valveauto]

Ah yea I’ve seen it 👍

[@keithriley3159]

@@valveauto I’m having occasional boost issues that I need to investigate. That’s how I ended up watching your video 👍

[@valveauto]

If you get stuck ping me

[@keithriley3159]

@@valveauto thanks, I’ve just got to be arsed to sort it out 😂

[@andrewmilner2438]

Which pillar mount is best for my tt 2003 ? Would send a link for the one like yours ?

[@gregr3283]

Yes you didn't say anything about the mount.

[@valveauto]

Mintice 2 Inch 52 mm Universal Side Single Hole Gauge Pod Holder Gauge Mount Bracket Instrument Holder amzn.eu/d/9d9f4OK

[@valveauto]

@valveauto apologies YT has removed all my responses for some reason.

[@DrCrazyAzz]

What is the acid test with the oil filer cap?

[@DrCrazyAzz]

Thanks bud, so its should be sucking in?@@valveauto

[@DrCrazyAzz]

Thanks for the reply and the content.@@valveauto