New Car – Audi A4 Avant B715 min read

2020 was supposed to be a year of avdenture and wonder for my girlfriend and I. After years of saving and excitement, we left our jobs, homes and security to backpack for as long as we could make it.

That lasted a whopping 2 months as we were forced to return to the UK as the outbreak started taking its grip on the world. It was a difficult decision to make, but ultimately the right one.

We returned home a day before my birthday. Instead of drinking cool beers on a Thai beach with nothing to worry about, I was spending my birthday indoors with nothing to do. Amazing.

No job, nothing to do, unable to leave home I convinced myself that a new car would drown my sorrows and give me something to concentrate on, so that’s what I did.

So, after around a week of looking around, I found the car I was looking for. The day after my birthday, I went out to see it and a few hours later, had my new car parked up.

A little bit of history.

I’m a relatively new driver, at the time of writing I’ve had my license for less than a year and half. Owing to this, and the fact that I live in London, my insurance is insane. When I was shopping for my first car I had a real predicament in finding something that wasn’t an absolute shitbox but also didn’t destroy me on insurance, which anything did anyway.

What I ended up with was a 1L 2014 Ford Fiesta which served my girlfriend and I really well. Even being a small 1-litre engine, my insurance was still £2500. Yes. That was the cheapest I could get anywhere, and regardless of the car was not much less.

I really enjoyed the Fiesta, was a really nice drive and even at 1L, had enough power to satisfy my new thirst for speed thanks to it’s small turbo.

I didn’t really do much to the car bar changing the intake and small modifications like HID install as I was always planning on selling it and getting something larger and faster which I would instead spend my money and this is where I have arrived with the Audi.

The Spec.

Due to my rush to get a new car I didn’t really have a lot of choice when it came to spec, but I did manage to find one that had almost everything I wanted.

  • 2008 Audi A4 Avant S-Line
  • Quattro w/ Torsen 50/50 differential
  • Full S-Line spec, not ‘S-Line lite’
  • 2.0L TDI BRD engine – 170BHP stock
  • 18″ RS4 Rims w/ alloy spare
  • Full leather interior
  • Front heated seats w/ electric lumbar support
  • Climatron
  • Multifunction Steering wheel
  • Full Bose sound system w/ sub
  • Auto lights & Auto wipers

When I bought the car it had 140k miles, which is a lot, but I did get a pretty good deal on it considering what other similarly spec’d cars were going for and, really, if well looked after 140k isn’t a lot for a diesel like this.

Why Diesel?

I decided to go for a TDI as the fuel consumption for long trips better, and we do a lot of long drives. Torque figures are also very good and with a straight map this car should get around 210BHP without modifications, and around 250BHP+ with some modifications here and there, which is more than enough for a car like this.

I was also heavily persuaded and encouraged by my good friend Tigattack as I have been following his Diesel journey and was always impressed by the power of his cars when sitting in it. Go have a look at his car shenanigans over here. He’d also persuaded me that older cars were more fun with more possibilities for modifications, previously I wouldn’t have considered a car of this age but here we are.

Note: Because I’ve taken so long to write this post, he’s actually gotten the exact same car now after wanting one for a while and enjoying mine :D.


Unfortunately there was no service history with the car, so I’ve made it my mission to make sure everything is healthy and fully documented for when it’s time to say goodbye.

First on my list was a complete service, including cambelt & water pump change as well as the auxiliary belt.

I made sure to get this done as soon as possible, so within days I had someone come and help me change all these parts as well as give the car a once over once everything was opened up.

Owing to the engines longitudinal placement the entire front end had to be removed to get to the belts. After all was done, the belts, water pump, tensioner and an idler were changed, after which she was purring like a tractor.

Of course, the oil was flushed and changed with performance oil, and coolant drained and refilled so I knew what was in there, which had to be drained for the water pump in anycase.

After doing 5000 odd miles or so since that job, the car has performed well bar the issues coming later in this post. I’ve made sure to use Diesel cleaners in fuel top-ups, as well as injector, EGR & DPF cleaning additives.

Radio Woes.

One of the biggest gripes with the car right off the bat was the old head unit which didn’t have any Bluetooth support. This was pretty annoying for a long time and the use of FM transceivers was driving me nuts.

The Bose speakers and amp in the car sound pretty good, so there isn’t any need to change this in my eyes, but the Audi Symphony had to go.

After a lot of deliberation I decided to give an Android head unit a go instead of a branded one, as I like to tinker (see this blog…) and the functionality is far superior.

The OEM look was something that I would have ideally liked but I did want something as functional as possible, so retrofitting Linux/Android Auto into an RNS-E was still a no go for me owing to the smaller screens size.

Now, when I say Android head unit I do not mean the cheapest of the cheap Aliexpress buy, I did opt for a branded, well-reviewed unit from Amazon, namely this Pumpkin unit. One of the main reasons for choosing this particular one was that I really wanted a proper volume knob.

After ordering the correct Audi ‘Quadlock’ to ISO connectors I installed the unit and was pretty impressed, but the speakers had awful alternator whine and when using the headlights it was impossible to ignore the high pitched screeching through the speakers.
I opted for a high to low-frequency converter instead of using the RCAs on the back of the head unit and this has worked really well. Below is the finished loom for the head unit including the high to low converter spliced in.

The only real issue I have with the unit is that I don’t have a fitting bezel to fit around it as you can see below. This actually doesn’t annoy me as much as it should, especially since spraying the metal cage around it black but I will eventually 3D print something to go around it, but for now I’m really happy with this setup.

Navigation like this is a lot better than having my phone on the windscreen, and since everything works with the steering wheel controls (which are fully remappable) it’s turned out to be a really worthwhile purchase.

The GPS antenna and microphone were run down the A pillar with the WiFi antenna just shoved behind the dash.

The girlfriend and I have had a fair few lunches in the car watching Plex on it too which has been very useful when on the road!

Limp Mode Is No Fun.

Unfortunately, on my first long trip the car decided to yeet itself into limp mode which was a very real experience for me. I have read a lot of people talk about limp mode as a minor inconvenience but limp mode in this car is pretty full-on, especially when travelling at speed.
The car pretty much cuts off the turbo and you lose almost all power, so cruising on the motorway becomes an impossible task, it struggled to maintain 40MPH and hills were a real struggle.

Turning the car off and on again seemed to fix the issue for a little while, sometimes enough for me to get home or a decent chunk to where I was going, sometimes it would fail instantly. I got very practiced at turning the car off on the motorway and letting the momentum turn the engine over.

After a lot of back and forth with trying to fix the issue, investigating possible boost leaks or even stuck veins in the turbo, the issue ended up being a very dead swirl flap actuator, the actuator has a rubber gasket which had completely split and leaked vacuum, vacuum which is shared with the turbo actuator.

This 20 GBP part ended up fixing the issue at long last.

Image curtesy of Darkside Developments.

Eventually I plan to remove the swirl flap in it’s entirety using another intake manifold as they are known to cause issues.

Minor Modifications + Retrofits.

Cruise Control.

One very crucial thing that I had to retrofit immediately was cruise control, thankfully this is as easy as buying a stalk for around 20-30 GBP, removing the steering wheel, cowling and a few modules, installing the stalk and coding using VCDS.

The things to remove come out really easily, as long as you have the right tools. Once this is done it’s a piece of cake really. The image below shows the last step before putting the steering wheel back on, you can see the cruise stalk on the bottom left.

Here is how everything looks when sitting in the drivers seat.

Interior LEDs.

Of course, this is something everyone should do with their cars IMO. Changing out the horrible halogen bulbs with nice bright white LEDs was an easy job and really helped with the look and usability of the car.

A few smaller additions which I’ve made such as cable routing into the driver’s cubby hole for keeping my phone charged, and routing chargers into the glovebox, putting a microphone near the A-pillar, as well as fitting the GPS antenna for the head unit underneath.

There are a myriad other little things that I’m planning to do as well to make life easier and generally make the car feel newer than it is.

Wind Deflectors.

I know some people hate them, but I think they add a lot to a cars look and also give you the ability to crack open a window at high speeds with a much reduced noise in the cabin.

Future Plans.

I have a number of things I want to do to the car now that’s it’s working and performing as it should, in a somewhat order of importance is the following:

  • Retrofit interior lighting pack.
  • Retrofit folding & dimming side mirrors.
  • New headlights with DLRs and projectors for HIDs.
  • RS4 brake upgrade, same size disks but improved performance.
  • Calliper recondition/respray.
  • New suspension & lowering springs.
  • RS4 sway bar upgrade.
  • DPF + EGR Delete.
  • Swirl flap delete.
  • New turbo-back exhaust.
  • Hybrid Turbo.
  • Front mount intercooler.
  • Remap after the above.
  • Rim refurbish and possible spray.
  • Fix paintwork.


All in all I’m very happy with the car and can’t wait to see it slowly evolve over time as I fix more things and add more and more improvements.

Having an estate has been really useful for transporting larger things and not having to worry about filling a small car, it’s also been great to bring the seats down and have a chill with the boot open.

Even the dogs have much preferred their journeys to long walks.

The overall look of the car is, in my opinion, really nice too without having to spend so much. It’s a very good looking car that one could be mistaken for thinking is a lot newer, which I think is perfect.

I’m sure next time I post an update will be a long time from now so I’m hoping most of these upgrades/fixes should be implemented, so if you’re interested subscribe to my blog or some shit.

Thanks for reading! ~~Muffin

1 thought on “New Car – Audi A4 Avant B715 min read

  1. Hello Muffin!
    As a first time commenter I must derail my prerogative to say THANK YOU! Your blog is an amazing and influential resource, and an ultimate kindness to the world.

    This has definitely not been a typical year, and likewise this is not the type of post I expected to find here. Nevertheless cooperative systems are awesome no matter how they are physically implemented or purposed, we don’t mind smaller automotive updates here. 🙂
    It is interesting to see I was not the only one who had to sacrifice an abnormal amount of money and manhours to the automotive gods. My significant other wrecked my up-until-recent mint anniversary edition 350z, and with insurance BS I was in a situation were it made more sense to invest in the tools and perform the necessary reparations myself.. Transportation to the office was going to be an issue so in a panic I got a truck to fill the time gap until I could get the Z back on the road. One week later everything went on lockdown and I’ve been WFH ever since. *facepalm*

    All that to say: I hope you find time to update us sooner than you expect- your distractions are much appreciated 😀

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