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Discussion Starter · #1 ·
Like my title says I am a potential S5 convertible owner. This will not replace my daily which is a 2020 E class. I haven’t had an Audi since the early 2000s when I had an A4 3.0 which was just completely unreliable.
Fast forward I like to pick up a new to me convertible every so often.

The car I’m interested in is a 2011, 1 owner 90k miles S5 convertible. Not much info on previous service history but was a single owner (dealer claims it was a doctor). Car is black with an orange-ish interior (forgive me as I’m not familiar with the color names yet). Car does not have the Prestiege package which I am bummed about but nonetheless a nicely equipped 10 year old car.

car is currently tuned by previous owner (some sort of pulley and a chip). Totally not my thing by any means but it’s all in there and I assume not something easy to remove.

anything major I should lookout for? Car shifts perfect. Has a funny feeling when I stop and idle at a red light during the test drive but I can only assume this is part of the tune.

hoping someone can jump in here and help!
Thanks
 

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Hi Isosunrise7, welcome to the forum! I am here often but don't normally post (mainly because the experts have covered it all before and are great!)

S5 cab is a great car! I was in the same position with you just over a couple years ago - I ended up buying 2009 S5 cab.
I have done a few mods and Stage 2 MRC. The mechanics of the car are solid.

A couple things I would check / checked before buying:
  • Considering its already modded, try to find out what pulley has been installed if you can - From my research, increasing the ratio of the supercharger beyond a stage 2 would require extra cooling
  • Also considering the aftermarket map, you might want to considering servicing the car more frequent than what's stated in the book (move to more an rs5 schedule). I generally take it once a year to the Specialists to get serviced and the stamp, and then service it myself 6 months later - I am using mine as a daily. I also change spark plugs and gearbox oil more regular.
  • There was a lot of reported issues with the early issues of gearbox failure - down to the mechatronics unit - this can be costly to repair. What is the funny feeling when you stop? It should stop as normal, even with an aftermarket map. Someone with actual experience might be able to help you here

A lot of info to take in and I hope I haven't scared you off purchasing. The car is a dream to drive! Great interior, smooth and refined but also a lot of fun when you want it to be - love it!
 

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Discussion Starter · #3 ·
Hi Isosunrise7, welcome to the forum! I am here often but don't normally post (mainly because the experts have covered it all before and are great!)

S5 cab is a great car! I was in the same position with you just over a couple years ago - I ended up buying 2009 S5 cab.
I have done a few mods and Stage 2 MRC. The mechanics of the car are solid.

A couple things I would check / checked before buying:
  • Considering its already modded, try to find out what pulley has been installed if you can - From my research, increasing the ratio of the supercharger beyond a stage 2 would require extra cooling
  • Also considering the aftermarket map, you might want to considering servicing the car more frequent than what's stated in the book (move to more an rs5 schedule). I generally take it once a year to the Specialists to get serviced and the stamp, and then service it myself 6 months later - I am using mine as a daily. I also change spark plugs and gearbox oil more regular.
  • There was a lot of reported issues with the early issues of gearbox failure - down to the mechatronics unit - this can be costly to repair. What is the funny feeling when you stop? It should stop as normal, even with an aftermarket map. Someone with actual experience might be able to help you here

A lot of info to take in and I hope I haven't scared you off purchasing. The car is a dream to drive! Great interior, smooth and refined but also a lot of fun when you want it to be - love it!
Thank you for all of this info. I am uncertain of the mapping or the pulley. At its current mileage I am Also unsure of what service has been completed.
 

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Personally, it it's had the pulley upgraded and stage 2 map, I think that's ok as long as it's been done by a reputable company, many on have done so. However service is key, and if there is no proof of service (including stronic service) than I'd walk away. Just not worth the risk.
 

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Discussion Starter · #5 ·
Personally, it it's had the pulley upgraded and stage 2 map, I think that's ok as long as it's been done by a reputable company, many on have done so. However service is key, and if there is no proof of service (including stronic service) than I'd walk away. Just not worth the risk.
When you say S tronic- you mean the trans?
 

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I would find out more about the "chip". Is it a plugin module or is it more commonly what is called a "tune" which is a reprogramming the ECU (and hopefully the TCU (transmission control unit)). A plug in module such as chipwerke can be a stage 2 and a pulley. It does not make as much HP as a true tune but is easily removable and does not require additional mods. With a stage 2 ECU tune, additional cooling should be addressed and the cats may not survive. Read some of the links I posted. Audi s5 B8.5 stage 2
 

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anything major I should lookout for? Car shifts perfect. Has a funny feeling when I stop and idle at a red light during the test drive but I can only assume this is part of the tune.
Do some research. The earlier DSGs had problems. From what I have read one of the symptoms was a "jerky" shift from 2 to 1 which is what you might have experienced. In general the B8 S5 was a fantastic car let down by gearbox problems. Check our Audizine.
 

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Discussion Starter · #12 ·
Do some research. The earlier DSGs had problems. From what I have read one of the symptoms was a "jerky" shift from 2 to 1 which is what you might have experienced. In general the B8 S5 was a fantastic car let down by gearbox problems. Check our Audizine.
I’ve never driven a dsg car before. The best way to describe it was, feeling like when the brake is applied the cars going into neutral. When I let my foot off the brake it felt like I let my car off the clutch and put it into first. Maybe it’s on my head ?
 

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Hello Iso and welcome!! As you know the S5 is a truly lovely car but you must be careful cos problems can be very costly. Given that you have no great hurry, personally I would tend to let this one go and try another without tuning and with a manual gearbox OR with a "better" auto box ie without the wierd feeling. My old A5 3.2 had the "slushbox" but it worked great, my current S4 has the 6 speed auto and that too works great, I made a transmission oil change on both just to be safe. Good luck!!!
 
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