Made some passes today...

So been rained out the last two weeks so got my first chance this year at the strip today… Was very excited as APR has made some changes to their production tunes and we put that on my car. I was very optimistic since they went 11.0x a few times in average DA. Plus with Mogs results and Loe’s GIAC benchmark I wanted to see how I’d do… DA here was great today but as I’ve often said not all DA’s are created equal. The 400-500ish DA today was mostly from the cold 44-46F temps and not the average at best BP of 30.1 and humidity of 70%ish… The sun never came out for more than a minute or two so the track surface was ice cold and prep was average. Of course there was a long wait between runs and I had no way to get heat in the tires. Had some other issues but more on that later… Anyway, enough with the excuses…

My Car: 2010 Audi S4 - DSG with sports dif, currently has 10,140 miles, most runs done with 1/8 - 1/4 tank of gas, tools and spare removed.

Mods: APR tune, APR DSG tune with LC disabled/AMAX enabled, APR blower pulley, APR crank pulley, APR TB, APR intake(larger filter and no box), APR CPS v1, 034 HFC’s, Miltek non-res dp/catback, front and rear sways, 380mm Brembo BBK, JHM LW rear rotors, BBS CHR’s, Conti’s with varying tire pressure depending on the conditions.

First pass spun pretty bad and short shifted into 2nd at 5500-5600 rpm… Tire pressure was 38-34

1.6412 60ft
4.7702 330ft
7.3308 1/8th
96.42 1/8 mph
9.5130 1000ft
11.3657 1/4 et
123.14 ¼ MPH
The spin and subsequent short shift killed the run, 60 wasn’t great but the 330 and beyond really suffered.

Second pass wheel hopped horribly which killed my 60ft worse than the spin…Tire pressure was 32-28

1.7244 60ft
4.8636 330ft
7.4082 1/8th
97.04 1/8 mph
9.5745 1000ft
11.4132 ¼ et
124.15 ¼ MPH
So like I said horrible 60 but wow pretty nice 1/8 mph and 1/4 MPH. First time I’ve trapped over 124. Thought that was good until I reviewed my logs…

Third pass I wheel hopped badly again… Tire pressure was 32-24

1.6662 60ft
4.7773 330ft
7.3269 1/8th
96.42 1/8 mph
9.5022 1000ft
11.3479 ¼ et
124.14 ¼ MPH
Another 124+ trap so was happy about that…

Just couldn’t get traction as the track surface was very cold with no sun to heat it. I spun with too much air and hopped with not enough. If I could have hot lapped like in the fall I’d have been fine because once the tires are warm they’ll hook but it was roughly 2 hours between the 3 passes. So they were ice cold. This probably helped IAT’s though. I really wonder how my Macan would have done today with a/s tires.
So while waiting to make the third pass I looked at the log and noticed mass timing pull, more than I’ve ever seen. I was like WTF. I thought about it and the only thing I can think of is the gas. Last year in Nov I couldn’t get 104 around here so I ran with 100 the one weekend and ordered a pail for the next. Well there was never a next but I had put it in my car. So it sat all winter in my garage so I’m wondering if it wasn’t the greatest quality as I don’t see why the car would pull as much timing as it did. We’re talking way above 5 degrees for multiple readings. It has more pull than when I ran the beta 104 tune on 100 last year. Already have new fuel so will see if that cures it and I’m very low now… I’ll probably pull a few plugs Sunday also to see how they look… They’re new from when I put the UC on, so 500ish miles or so on them… I’ll send Eric the logs but I think he’s out of the country so we’ll see what he says…

Anyway, little bummed with the results but happy to see the traps and given conditions and timing pull it’s really pretty good… Pretty confident next time will go much better but will see…