3.0T intake air temps

[guy013]

I’ve just purchased a BlueDriver OBD sensor which allows me to log several parameters including IAT and ignition advance and boost pressure. I’m currently running APR DUAL PULLEY stage 2 with stock cooling. Have a MercRacing heat exchanger on order and would like to get some logs to compare before/ after install.

What IAT are you guys typically running and under what scenarios? And at what IAT does the ECU start to pull timing?

Also what boost does dual pulley stage 2 usually peak at?

I don’t have access to a 1/4 mile track but will try to get some logs under various driving situations.

Also what other parameters are worth monitoring?

[07S6]

Subscribed! Interested to learn what the temp impacts are by adding the second pulley...without a cooling upgrade.

[Upstate Audi]

Also interested! I look forward to seeing your before and after results. You should also do the 100% duty pump mod to see what difference that makes on stock cooling

[guy013]

Just doing some test logging last night driving around in city traffic. Stopped at some lights, didn’t get past 3k rpms at any stage.

Was surprised to max boost 32 psi??? Do I need to subtract ambient pressure from this? This was reading direct from ECU

Also IAT started at ambient on start up then quickly moved up to ~50c and stayed there for rest of drive. Didn’t log ambient but it was around 30c

Just getting used to the logging format and will update more after some test fast runs

BlueDriver interface by guytan13, on Flickr

Update:

More logging done on city driving during daytime (ambient ~35c) and IAT hovered around 55c. Seems like during normal stop start driving, the IAT are right around 20c above ambient. Starting the car again right after parking a while in the hot sun IAT soared to around low 60c and takes about 15-20min of driving before settling back to low 50c. Heatsoak is a factor and wondering if the metal Injen intake tubing doesn't help matters.

coolant temp stuck on 91-93c thru all logging sessions. Will be interesting to see if the new HX affects coolant temp at all

[p3u]

Was surprised to max boost 32 psi??? Do I need to subtract ambient pressure from this? This was reading direct from ECU

That's absolute pressure, so subtract atmospheric pressure for true number.

[guy013]

Managed to log a couple 1/4 miles runs. Surprised that the IAT was managed rather well with stock cooling. After the first run, I cruised for about 5min to cool down the transmission before another launch. Coolant temp remained solid at 93c the entire time.

Overall pretty happy with the performance of the vehicle. Both runs were almost identical in data and the "track" was slightly uphill as well. Will test again after MercRacing HX installed. I feel the APR TCU tune really contributed to the good times as well. Before the DSG flash, launch control was 3000rpm vs 5000rpm, and shift points were all at 6200-6300 vs 7000+rpms.

Equipment used:
VBOX SPORT datalogger for acceleration and GPS data
BlueDriver OBD tool for datalogging of vehicle sensors

Vehicle is 2012 A6 C7 3.0T (S-tronic)
APR Stage 2 (Dual Pulley)
APR TCU Tune (launch at 5000rpms)

Location data scrubbed off

[DocTJ]

Nice numbers man

[shoe3k]

Managed to log a couple 1/4 miles runs. Surprised that the IAT was managed rather well with stock cooling. After the first run, I cruised for about 5min to cool down the transmission before another launch. Coolant temp remained solid at 93c the entire time.

Overall pretty happy with the performance of the vehicle. Both runs were almost identical in data and the "track" was slightly uphill as well. Will test again after MercRacing HX installed. I feel the APR TCU tune really contributed to the good times as well. Before the DSG flash, launch control was 3000rpm vs 5000rpm, and shift points were all at 6200-6300 vs 7000+rpms.

Equipment used:
VBOX SPORT datalogger for acceleration and GPS data
BlueDriver OBD tool for datalogging of vehicle sensors

Vehicle is 2012 A6 C7 3.0T (S-tronic)
APR Stage 2 (Dual Pulley)
APR TCU Tune (launch at 5000rpms)

Location data scrubbed off

The stock cooling is pretty good from I have seen on the A6 and B8.5 S4. Even on my old S4 with dual-pulley, I was getting really good temps doing highway pulls in an unknown, top secret location in Mexico. If you're doing constant track sessions, I would recommend cooling because the stock system can be overwhelmed.

[BG SQ5]

Managed to log a couple 1/4 miles runs. Surprised that the IAT was managed rather well with stock cooling. After the first run, I cruised for about 5min to cool down the transmission before another launch. Coolant temp remained solid at 93c the entire time.

Overall pretty happy with the performance of the vehicle. Both runs were almost identical in data and the "track" was slightly uphill as well. Will test again after MercRacing HX installed. I feel the APR TCU tune really contributed to the good times as well. Before the DSG flash, launch control was 3000rpm vs 5000rpm, and shift points were all at 6200-6300 vs 7000+rpms.

Equipment used:
VBOX SPORT datalogger for acceleration and GPS data
BlueDriver OBD tool for datalogging of vehicle sensors

Vehicle is 2012 A6 C7 3.0T (S-tronic)
APR Stage 2 (Dual Pulley)
APR TCU Tune (launch at 5000rpms)

Location data scrubbed off

Heads up- it looks like you’re monitoring the wrong IAT channel. Most standard OBD devices look at the pre-charger air temp, as opposed to post-charger. You’ll never see WOT charge air temps on a 3.0T like your data.

[Hofahome]

Agree with above. I'd go looking at the B8/8.5 S4 forum if I were you. Plethora of info in there. The 3.0t will spike higher IAT's than that at WOT - it heats up like a pissed off wife on fire. Btw, dual pulley cars without upgraded cooling can actually pull enough timing to make them less powerful than stock. I found that the upgraded cooling was best about recovery of IAT's and my S4 did not "die" from run to run. Good times BTW.
here is example of my IATs on my S4:
https://docs.google.com/spreadsheets...#gid=785561937

[guy013]

I feel like a nitwit 😭