r/audis5

Considering a 2020 S5 premium plus coupe. Clean title, no accidents, 3 owner ~42k miles. It’s had all this done to it plus a very nice carbon steering wheel. It’s the exact spec I want and has all the mods and more that I would likely end up doing down the road. Dealer asking $39k.

Got a B8.5 S5 (2014). Been noticing extensive coolant loss and saw this today on the driveway. Passenger side-ish, and pretty big spill. Its been consistently getting worse especially as the midwest weather has slowly warmed up. During the winter I’d have to top up half the resevoir maybe once a month, twice max. Now its half the resevoir once a week. Given the nature of where it is, I really can’t tell where it would come from. Could someone give a hand?

Who need’s wheels in Jersey?!?! 🗽

Rmp bouncing on Idle , Engine light on , recently Audi replaced PCV valve

One thing I don’t see talked about enough in the tuning community is the importance of using a proper stable power supply while flashing your ECU or TCU. These cars are extremely voltage-sensitive during the flash process, and if voltage drops or fluctuates midway through programming, you can end up locked out of the module or potentially brick the ECU/TCU and create a very expensive problem.

I actually learned this the hard way after running into an issue while tuning my S5. That’s when I met my mechanic, John, over at AXION. He helped me recover and unlock the ECU so we could complete the tune properly. One of the first things he stressed to me afterward was the importance of using a real stable power supply anytime you flash these cars.

After talking with him, I purchased the same unit he uses in the shop:

Snap-on EEBC30A12V Battery Charger Plus (LiFePO4 capable)

I paid around $360 for it and now use it every single time I flash the car. ECU, TCU, returning to stock, doesn’t matter. I won’t flash without it connected.

A lot of people assume a normal battery charger is good enough, but there’s a difference between charging a battery and maintaining a clean, stable voltage supply during programming.

Considering how much money most of us have invested into tunes, intercoolers, intakes, downpipes, wheels, tires, and everything else, this honestly feels like cheap insurance. If you tune at home, I’d strongly recommend investing in a proper power supply before flashing your car.

2019 B9 S5 sportback has a rattle that can be heard faintly while idling but gets really loud while accelerating I attached a video. Took it to the dealer. Dealer said to pinpoint the sound they have to take the whole dash apart, about a 6hr job thatll run me north of $1200. I have audi pure protection (platinum) and the service advisor said theres a chance audi pure wont cover this so I took the car back because I dont know if I can swing $1200 on a chance. My audi pure expires in June. The noise sounds like its coming from behind the cluster. Anybody have this problem before? Is there a way to pull the cluster out with some trim pieces without disassembling the entire dash? Thanks in advance for any suggestions or tips!

Big thanks to John and Zac at AXION MOTORSPORTS in Holbrook, MA for helping me get my B9.5 TCU unlocked today.

The process was surprisingly quick and straightforward. Honestly, it was pretty much just like uploading a tune while sitting inside the cabin. Definitely nowhere near as involved as I expected.

Right now, I’m checking with 034Motorsport because I thought I had purchased the Stage-1 ECU / Stage-2 TCU bundle, but I may be mistaken since only the Stage-1 TCU tune appeared in my dongle.

The “seat of the pants” feel after flashing the Stage-1 TCU tune was pretty much nonexistent, which honestly was expected. From everything I’ve read, the Stage-2 TCU tune is where the more significant transmission performance changes really start showing up.

If I confirm that I only purchased the Stage-1 TCU tune, I’ll probably be upgrading in the near future to take advantage of the added transmission performance and revised behavior from the Stage-2 file.

If you’re in New England and already have a 034Motorsport tuning dongle, AXION MOTORSPORTS now has the Boot Loader Unlock (BLU) setup and can unlock the B9.5/4M.5/4M8 AL552/AL952 transmissions locally.

Posted another S5 in this group before but thoughts on this one. Or if anyone was the previous owner of this one let me know!

Looks like the only thing missing is the black optics, which I am okay with doing myself.

https://www.tamiamihyundai.com/inventory/used-2023-audi-s5-sportback-premium-plus-all-wheel-drive-hatchback-wauc4cf52pa012867/

Navarra blue s5 b9.5 2022. Forged rims came in hyper silver. 20 x 10J ET 25 with 275/30/20 CSC7s. Thoughts?

It came as I imagined it to be, but not sure if I should spray the rims black or even bronze instead.

I still do have a front bumper lip, sideskirt lip, and rear psm spoiler on order - all of it in gloss black. 😄

034 Motorsports came through fast with this one. My SPI Boot Loader Unlock (BLU) Harness for the B9.5/4M.5/4M8 AL552/AL952 just landed and I’m ready to get to work. I appreciate how quickly they got this out.

Next step is unlocking the TCU and finally seeing what this setup can really do.

From what’s actually changed on these ZF 8-speed cars with a proper TCU tune:

Faster shift timing and reduced delay between gears
Increased allowable torque input so the transmission doesn’t limit a tuned engine
Revised shift points
Improved torque converter lock-up strategy
Reduced gear hunting in steady driving
More consistent launch behavior through adjusted torque management
Better coordination between ECU and TCU during acceleration

This is one of those upgrades that doesn’t get talked about as much as engine tuning, but it changes how the whole car drives.

Can’t wait to get it unlocked and feel the difference.

The 034SPI Boot Loader Unlock (BLU) Harness is now available, giving you direct access to unlock your 2022-2025 B9.5 S4/S5/SQ5, 4M.5 Q7/SQ7, or 4M8 Q8/SQ8 equipped with an AL552/952 TCU with the locked 401 boot loader.

What to Expect
Unlock your TCU without removing or replacing hardware
Complete the process from home or through your preferred 034 dealer
Enable Dynamic+ TCU tuning for improved drivability, shift quality, and performance
Once unlocked, supported 034Motorsport TCU tunes can be flashed via OBD for AL552/952 applications, making future updates fast and simple.
034SPI Update Required
A new version of the 034SPI application is now available and must be updated to perform the BLU unlock process. Be sure your app is fully up to date before starting.