Hi guys, I’ve been a silent reader here for a while but first time to post.
The car is 2011 S5 Sportback (pre-facelift, but 3.0T unlike the early coupe S5s), mapped Revo Stage 2+ 91 octane (pulley, decat on stock exhaust and respective tune) incl. DSG tune a couple of weeks ago, now trying to figure out what my problem is as the car does not feel to have the claimed 470 bhp by all means.
Don’t have a dragstrip nearby but measured 100-200 with Racelogic and got 12.7 sec best which is a joke. I saw similar engine cars (incl. both A4s/S5s/A6 doing 100-200 in about 10 sec).
When trying to trace the issue with local Revo dealer the outcome (based on logs) was that the car runs fine (which is boosting ca. 1 bar, max air consumption ca. 1300 kg/h, no major ignition pull due to knock) but the IATs were somewhat high exceeding 65C already on the 4th gear if you start your pull on 2000 revs on 3rd and then just keep going and shifting at readline (which is 7000 on Revo DSG tune). I don’t have those logs unfortunately.
To adress the IATs I swapped the stock compressor cooler (front) to a new one (don’t want to go for an aftermarket cooling system at this stage) and bled the system properly to ensure everything is working as it should.
In the last days I finally managed to make some logs myself and here’s what I saw (this is 3rd gear 2000-7000 and then 4th gear from 5500 or so to almost 7000 as well):
http://i1230.photobucket.com/albums/ee498/lemanopc/RevoSt2log_19092015.jpg
There was no major knock / ignition pull. I made several logs and the picture is pretty consistent. Ambient temp was 25C. I’ll post the full log file when I figure how.
Would much appreciate the opinions on above, especially:
- My boost is only peaking 0,9 bar and then sharply dropping to 0,7-0,6 closer to redline while the specified value is peaking 1,2 bar and gradually declines to 1,0 on higher revs. Despite this fact the compressor flap is 23% opened all the time. Is there any logical explanation to that?
- Is my understanding correct that stage 2 3.0T (APR, GIAC etc) actually boost around 1.0 to redline?
- My IATs are still high reaching 65C aready by the end of 3rd gear pull. Does this look wrong (given stock cooling)? I saw some 3rd gear pull logs on here and elsewhere but still uncertain.