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Author Topic: Tuning my BWA  (Read 1927 times)
notoriousg
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« on: September 26, 2025, 03:01:34 PM »

Hey, guys

first i would like to thank you for the great community, which has helped me learn a lot by reading the threads in various occasions.
I started learning tweaking and learning motronic by playing around with my MED9 BWA A3 8p. I am constantly refering to S4 wiki,
which is a big help even on a newer ECU. I`ve done a tune on it and i am somehow happy with how it turned out for my first attempts.
The car is completely stock for now. I am trying to tune it for 1 bar boost across the rev range as close as possible, but i am getting
a boost drop. Initially it was peaking at 0.8 bar quite late at 3800 rpm and dropping to 0.5 at higher rpm, then i tweaked the boost PID
and managed to get it peak to 1 bar at around 2800 rpm, which is a good sign, but it still doesn't manage to hold it at higher rpm and drops
to around 0.7 bar. I am using VAGCOM to log the car and here are some logs.

The initial ones start with LOG-XXX and the latter ones are mod6_X.

Any advises are appreciated!

Thank you.

Edit: Applied proper Vehical logs.


« Last Edit: September 29, 2025, 02:25:18 PM by notoriousg » Logged
ABEPerformance
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« Reply #1 on: September 30, 2025, 11:37:42 AM »

hello first of all you can start by doing a log from 1200rpm in 4th gear till redline and stop there ! after this you should do more research on which maps need modification ! good luck !
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notoriousg
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« Reply #2 on: October 01, 2025, 12:24:30 PM »

hello first of all you can start by doing a log from 1200rpm in 4th gear till redline and stop there ! after this you should do more research on which maps need modification ! good luck !
Hey,
I am thinking that it might be a mechanical issue i am having with the boost, since KFLDIMX is scaled to 1 bar boost request i shouldn't need to change it to run 1 bar. I will check the Waste gate solenoid.
« Last Edit: October 01, 2025, 12:42:38 PM by notoriousg » Logged
Nitefly
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« Reply #3 on: October 12, 2025, 12:49:32 AM »

Hello. I have not had the time to look at your logs, but always good the check a turbo car for airleaks, a smoke machine is very good for that.

Have you seen/read the MED 9.1 tuning thread Basaono did? I remember, he hade the same issue, not reaching target boost at higher rpm‘s. Could be your spring in wastegate actuator which is too weak…. or some may the hoses around the N75 you could check or the N75 it self…
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notoriousg
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« Reply #4 on: October 18, 2025, 01:02:28 PM »

I tried reviving the MED9.1 basics thread, but with no luck, so i`m posting here. Went back to stock and doing logs. I am trying to figure out a couple of things, before i try to tune.
1. Why is mimax dropping @5k rpm
2. Why fr_w (STFT i think) sky rocket @5.5k rpm and prroh (rail pressure) drops @5.5k rpm
3. Is it normal for the ECU to pull timing on the stock tune.

Logs of 4th gear ~2k rpm to 6300 rpm attached.
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