Figured I would eventually post in here because it's S5 related (I have been posting my results in the S4 section) since it's been a month after testing my set-up and it's integrated so well in terms of refinement and speed that I'd share my experience
I have been experimenting with a stacked tune for the past month ever since I went with a dual-pulley setup. For those of you who are not aware of what this is, it's simply running an overdrive pulley along with the normal 3.0t stage II undersized pulley; the s/c pulley increases boost approximately 2-3psi, the o/d crank pulley increases it approximately another 2-3psi. the reason I stacked my tune is because the standard GIAC stage 2 file doesn't support the extra boost that is being produced, and simply end's up bleeding up to 19.75% at wide-open throttle in the mid-range on some of my logs, while recovering and keeps it shut the majority of the way after 5,200rpm and gradually opening up to 6% starting at 6,500rpm to redline. What does this mean? the extra boost provided is only useful after 5,200rpm, below that it's make the producing the same amount as a normal GIAC stage II car.
To fix that, I had one of two options: 1) simply switch tuning company that does support a dual-pulley set-up , or 2) add a piggyback box to manipulate the manifold pressure sensors to keep the bypass shut at wide-open throttle. Although I knew it would be risky with option #2, I decided to proceed and log specific tables using VCDS for engine health. Why you may ask? The GIAC file has many qualities that I like: it's a proven tune that was tested with continued improvements that resulted in "v.2" software, the ECU/TCU communicates quite well with each other and has never given me hiccups where additional revisions are no longer needed to replace the v.2 software, and I also hold the #2 spot for 3.0t 1/4mile time as a single-pulley only setup ([email protected]), the #1 spot goes to another GIAC stage II car that ran [email protected], while the two quicker on the list are dual-pulley set-ups running [email protected], while the other one ran [email protected]).
As is, here are my current mods:
GIAC stage II v.2 ECU (race map)
GIAC DSG TCU
Chipwerke Pro (4-1 setting)
AWE-tuning pulley
JHM overdrive crank pulley
034Motorsports silicon throttle body boot
AFE filter
2.5" drilled hole in factory airbox
Exhaust x-pipe mod
Tires: 255/35/19 Michelin Pilot Super Sports
Wheels: OEM 19" rotor wheels
Fuel: 1/2 tank 93/e85 mixture (37.7% mixture)
Full weight including spare/jack
Dragstrip: Bradenton Motorsports located in Bradenton Florida
Here is my current quickest time (662ft Density Altitude), which happens to currently be the #1 spot for our stock Eaton TVS1320 blower:
R/T .266
60' 1.610
330' 4.659
1/8 7.210
MPH 97.19
1000' 9.396
1/4 11.240
MPH 122.44
Here are my time slips that are #1, #2, #3 spots on the 1/4mile record list:
Here is my time slip from another day in 1298ft. density altitude that would hold the #4 spot on the 1/4mile list:
Here are my time slips from another day in 1337ft. density altitude that would hold the #5, #6, #7 spots on the 1/4mile list:
The #3 spot was the only run where launch control was used. I will say that there is room for improvements when looking at my logs in terms of intake air temps are concern which affected the car in being able to hold ignition timing once they reach higher temps in 3rd and 4th gears. Relief is on the way as I am having my AWE Coldfront system installed along with an upgraded AWE s/c coolant pump to reduce and maintain lower intake air temps by 15-20celcius (27-36F) by the end a gears 1-4 run in the VCDS logs as others have shown me so that I can possible reach 27-28 degrees of peak ignition timing in those gears. I know it's possible because when I do a single gear log in 3rd or 4th gears (or start in 3rd gear and into 4th gear), I can hit those timing marks. However when I run through gears 1-4, I can only hit that in 1st and 2nd gears, with 3rd gear falling to 23-24 degrees of ignition advance, and 21 in 4th gear. Additionally, once I can see density altitudes closer to 0 feet or below, times should improve when fall/winter season arrives. I'll be doing on-going improvements with different cooling techniques that will hopefully result in better times.
My goal by the end of the year is to at least hit 11.0x with full weight and street tires, which is .15 seconds away
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Originally Posted by Rshane
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