Thoughts on AMS findings regarding divorcing coolant

B8 S4
#45

Thanks for clearing that up, I just haven’t seen anyone run thermocouple for water temp data. Usually they use RTD sensors as they are more accurate, thermocouple sensors have 30* +/- accuracy (Depending on the type). But if you have your baseline and testing data using thermocouples with the proper . However if you are using the engine water temp which is an RTD sensor as one of your data points things will be skewed.

But you guys have been doing this for a while, so I’ll just let your R&D do their thing.

Don’t mind my ranting.

#46

Sent again ron

#47

It was sitting in drafts for some reason

#48
#49

So Aaron/dblearon sent me some logs from today and gave me permission to post about them… He’s getting more now at the dragstrip ;D

I think these illustrate that there is clearly a difference between 13’s and 14’s… His car is a 2013 with GIAC tune and DSG tune… I had him focus on the timing values since it seems to be the biggest potential issue as boost isn’t bleeding on the tunes…

He made two runs… IAT’s were great with low 40’s average and peaks of low mid 50’s C…


http://i1012.photobucket.com/albums/af247/concordslim/Aaronlog_zps5cbc0a62.jpg

The average timing is nearly double what I’ve seen on the 2014’s! He was also running 93 and I believe Skywagon was running 100 on the 93 tune but I’m sure he’ll correct me if I’m incorrect about this… I’m sure it’s more complicated than that and I’m sure the tuners will dismiss this, but I figured it was worth discussing… Also, the drag passes should tell more with results through 4th gear… He is going to reduce the # of knock fields and grab boost and air mass values…

Edit: here are skywagons… lower iats for db help for sure but still a big timing delta…

http://i1012.photobucket.com/albums/af247/concordslim/skywagon_zps1b77ca91.jpg

#50

Brandon, Could you please clean up the performance thread and this one and put the 14 stuff in the thread I made mentioning the issues 1.5 months ago… Feel like we’re making each topic about too many things… Oh and I’m part to blame so not blaming anyone… Thanks bud!

http://audirevolution.net/forum/index.php?topic=2613.0

#51

Good idea. You should have just bumped your old thread. Recommend infraction for pt!

#52

Just left the track, laptops dead, 8 back to back runs easily…lost count.

Will send data to Ron tonighy

#53

What ya run?

#54

12.530 fastest time, spare in trunk, subs in trunk(45-60 lbs), 1/4 tank (reading 80 miles left), dewalt drill and laptop bag…uhhh some gum in the center counsel as well; I think that’s all the excuses I can up with.
I weigh a buck 58 but haven’t taken a dump yet today…

Didn’t mess with tire pressure, so probably high as hell as normally I keep it at 41.

79 degrees for majority of runs 82 degrees was the max I saw.

first 3 runs no wait time, next 4 10-15 minute waits, car stayed running in staging lanes,

last 4-6 runs easily 20-30 min waits, car stayed running; felt very hot to say the least. Seconded fastest run was my second to last (car easily heated up at this point and went 12.585.

Once I get home I’ll charge up the laptop and send logs. I messed up a few times on starting and stopping but there should be some good logs in there.

The track was run horribly, 4 times they messed up the tree and the trigger so Ron you may see some weird accelerations in there, not my fault.

#55

Dang… based on the logs I thought you’d do better like 12.3-12.4… Cooler around here I hadn’t looked at Chicago weather… What track was this? Looking forward to the logs…

Certain S4 owner at Norwalk APR stage II running a very nice time in 1800ish DA, but I’ll let him tell everyone about that… He went on race gas also… Hopefully, he has made some more passes but it’s a big event weekend so it’s probably slammed…

#56

Yeah 93 map for me, not sure what da is…can we look it up

#57

Rubber floor mats too :slight_smile:

#58

Enter the track, date and pick the time closet to when you ran…

http://www.dragtimes.com/da-density-altitude-calculator.php

#59

Should have an email Ron.

#60

2328 DA

#61

That sounds like a pretty decent time for that high of DA on the 93 tune.

#62

http://img.tapatalk.com/d/14/08/16/yhyhezys.jpg

http://img.tapatalk.com/d/14/08/16/y4y4ubyg.jpg

http://img.tapatalk.com/d/14/08/16/gyvu3eva.jpg

Here are the slips, some are missing due to the track not having their shit together nearly every other run, so sorry for that. Wasn’t going for times anyways just learning how to log and make sure I didn’t mess up.

#63

How do you correct for DA?

#64

Aaron, You can correct for DA at the bottom of the link I sent you… I’ve found the Mildly modified NA adjustment to be more accurate than the supercharged adjustment… Also, I show the DA was a little better than the 2328 more like 2027 at least for your best pass…

Thanks for the logs…

IAT’s were much worse than the morning logs you sent me even in the lower gears… Probably a result of worse conditions plus sitting still in the staging lanes… You have the new AMS/Alpha setup, correct? Small sample but comparing to some of my logs and others in similar conditions it doesn’t look to be any better at controlling IAT’s, doesn’t look any worse either… Again, way to small sample but it’s not like your 10C lower than others…

Timing was also a little lower on average… Average pull was a little better though… Still at least 3+ degrees higher than any 14 logs I’ve seen…

Boost looks fine with very little bypass…

Your MAF values are much lower than I expected for a Roc Euro setup… Is the filter dirty? Have you removed the snow screen in the stock plastic inlet? I’d say they are still better than the boxed intakes but probably 5% lower than most Roc Euro cars… Could also be the relatively high temps and under 30BP but humidity wasn’t too bad… I’d clean the filter and remove the screen if you haven’t… Also, a quick and cheap way to help IAT’s is to wrap the intake with header wrap… A roll is like $15 and it takes 10 minutes to install and looks decent if you buy the black…

Your best run is interesting as you sat on LC for a while… This caused boost to be dumped at over 30% until you were over 5K RPM in first… Timing was much higher though as the boost was dumped so that more than offset the reduced boost… All of the other runs boost was fine but timing was much much lower when launching… Unfortunately, I don’t think you have the log from pass #9 which was your other 12.5 but I bet it would show similar…

Bottom line is the car looks pretty good IMO… Better conditions and your 12.3-12.4 on pump… I’ll send the logs back… I highlighted the runs in green, LC in yellow, and averages in red… I have to go to Pitt to my inlaws for my wife and her twins bday but I’ll graph some things tonight and compare some more to other logs I have…