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    • Audiboost member switches from GIAC to APR tuning and picks up 3 miles per hour of trap speed - B8 S5 3.0T runs 11.0@126

      Excellent results here from AudiBoost member @spool twice who keeps pushing his 3.0 TFSI supercharged V6 in his B8 Audi S5 to new heights. To be perfectly fair he made more changes than just switching from GIAC to APR tuning.


      He wanted to pair APR's tuning to their Ultracharger setup which includes a larger throttle body. He also ported the supercharger so the gain in trap speed is not through tuning alone.

      Here is the mod list:

      -APR ECU (Ultracharger, 104 file)
      -APR TCU
      -AWE 57.55mm s/c pulley
      -Fluidampr 194mm crank pulley
      -HPFP upgrade
      -e85/93 fuel
      -Killerchiller w/ AWE reservoir & pump
      -Tampa Autosports test pipes
      -Tampa Autosports ported OEM supercharger
      -Modded OEM airbox

      This results in a very impressive pass just shy of breaking into the 10's:


      Now the slips with GIAC tuning:


      The car has a bit more wheelspin now so with better traction it looks like 10's should be achievable.

      Quote Originally Posted by Spool Twice
      ...there is more to be had. I didn't anticipate that the ported blower inducing more wheelspin at the track, so I had to launch at around 1,500 rpm. After this dragstrip event, I did learn an alternative launch method that allowed me to launch harder and keep an APR-specific wide-open throttle upshift algorithm that should allow for a drop in E.T. and a higher trap.

      Regarding boost, the car's performance is more than a single-gear dyno run now. I have around 4psi more boost in 1st gear, 3psi more in 2nd gear, 2psi more in 3rd gear (bleeding off some as it exceeds the file requests), 1.5psi more in 4th gear (again bleeding off some) in an almost apples-to-apples comparison.

      Also in an almost apples-to-apples comparison, the port job gained about 3mph in overall trap speeds, but hopefully will end up being more soon.
      Great results and documentation at every stage by @spool twice.

      This article was originally published in forum thread: Audi S5 3.0t traps 126.08mph started by spool twice View original post
      Comments 9 Comments
      1. quattr0's Avatar
        quattr0 -
        I'm sure you meant B8.5....

        Great result!!!
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by quattr0 Click here to enlarge
        I'm sure you meant B8.5....

        Great result!!!
        Yeah somewhat implied with 3.0T but yes.
      1. spool twice's Avatar
        spool twice -
        wow very cool, front page! haha

        I do have some additional mods to try out this time (software/hardware), I now have my throttle body adapter/reducer ported/polished, I have not had a chance to log just yet, but the car feels more on-the-spot for throttle response. Plus I have a different software, hopefully it will resolve the boost bypass that I get at the top of 3rd gear into 4th gears because of potential boost exceeding the software requests.

        Hopefully they all add up Click here to enlarge I'll hit the track next week, with less fuel this time. I had 1/2 tank of fuel on this run, and perhaps remove my spare/jack as well.
      1. spool twice's Avatar
        spool twice -
        slowly inching forward...

        I attended a local Audi Sport of Tampa private drag day at Bradenton Motorsports. The weather was perfect, low density altitudes, low temps, high barometric pressures, and low humidity. The only downside to this day was the sun wasn't out to heat up the track surface, so almost every Audi S4/S5 car beyond stage 1 levels just spun all four wheels no matter how it was launched.


        Overall, it was fun to hang out with a group of Audi enthusiasts who share the same passion.


        I didn't get a chance to grab all of my time slips, but here are some that I managed to snag:


        11.057@126.42 (personal best trap...hopefully with grip it'll go up more Click here to enlarge )
        11.030@126.38
        11.061@126.13
        11.062@125.85


        I lost a lot of my other 11.0x@126.xx mph slips, had a few 124.xx mph, 125.xx mph once where I completely spun 1st gear. Happy that I'm inching upwards in trap speeds, my previous best was 126.08mph, but a gain is still a gain.


        Click here to enlarge Click here to enlarge


        Here is a video of one of my slower runs with basically wheelspin in 1st gear:


      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by spool twice Click here to enlarge
        I didn't get a chance to grab all of my time slips, but here are some that I managed to snag:


        11.057@126.42 (personal best trap...hopefully with grip it'll go up more )
        11.030@126.38
        11.061@126.13
        11.062@125.85
        I'm not too familiar on 3.0T standings but where does this put you and is anyone in the 10's?
      1. spool twice's Avatar
        spool twice -
        on the GIAC software, I ran an 10.976 (#2), there are 2 others did ran 10.9x. I can't launch with this new set-up, its proving difficult so I've bee using a lower 2,000rpm launch technique (vs 4500 on my 10.9 run), and focusing on no-slip launches and trap speeds, sorta like a "run it like how I would run it on the streets" type of deal.

        My highest trap to date is 127.66 mph btw...Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by spool twice Click here to enlarge
        I can't launch with this new set-up, its proving difficult so I've bee using a lower 2,000rpm launch technique
        Why not?
      1. spool twice's Avatar
        spool twice -
        it simply overpowers all fours, spins in 1st and 2nd gears. I just need better tires, but I've been sticking to the daily driver theme so I've stuck with street tires. Currently I run MPS 4S, which I feel don't offer the same level of grip for acceleration as my old PSS'
      1. Sticky2's Avatar
        Sticky2 -
        Click here to enlarge Originally Posted by spool twice Click here to enlarge
        it simply overpowers all fours, spins in 1st and 2nd gears. I just need better tires, but I've been sticking to the daily driver theme so I've stuck with street tires. Currently I run MPS 4S, which I feel don't offer the same level of grip for acceleration as my old PSS'
        Come on now you know better than to run street tires...