NefMoto

I have an s3 1.8t AMK which seems to have an issue where it feels like it pulls a lot harder when I partial throttle compared to full. Is this likely to be a tuning issue or something else? I am not sure what tune is on it but there car came with a dyno print out which reads 280hp so I assume it's a stage 2 tune although the car doesn't isn't setup for stage 2, I think the previous owner may have removed some parts and put it back to stock but left the tune the same. I have attached a log which was a full throttle pull in 4th gear and I've attached the tune which is on the car. Please can someone tell me if this looks alright?

Use a proper logger. Obey forum rules.

http://nefariousmotorsports.com/forum/index.php?topic=4094.0title=

https://s4wiki.com/wiki/Throttle_cut

Sorry I didn’t spot that rule, I’ll do a propped log today.

Thanks for the link to that throttle cut page, I hadn’t spotted that on the wiki when I had a look. The car does have an abs light on at the moment for the back right sensor which might explain the issue. I’ll get an updated log today and I’ll see if I can also het the abs sensor changed today.


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This isn't Stage 2 or Stage 1.
It's Stage 0.

IRL, at a rate of 5, 10, and 15 IOPs, stock.
HBN is FF.

Stock fuel.
1.2 bar requested at 5500.

Stock ignition. :-X

oh wow, I guess it was put back to standard before it was sold to me or I may have given the wrong .bin file since I had 2 files on my pc (one stock and one from my car). Is it the same for this is definitely what's on the car at the moment.

same not original

original file
8N0906018J
0261206794
360314

Managed to finally got a log using me7Logger (had to remove the fuse for my clocks to get it to connect to the ecu). Looks like the throttle plate angle is at 100 until I let off. Is there anything unusual with this log that would explain why it performs better at partial throttle?

Best performance at mid-range....4500 is the only time your actual boost follows the requested boost 1.4b
You need to review the boost after 5000 it's not right

Would you say this could be because of a mechanical issue such as a boost leak or is this definitely a tune issue?

Would you say this could be because of a mechanical issue such as a boost leak or is this definitely a tune issue?

I don't see anything obviously wrong except that your requested boost is significantly higher than what your setup can do. Is it possible your intake hose is collapsing under boost?

I guess that could be happening, so I'll look into this. I have also just noticed a large tear in my pcv system from the valve cover to the hockey puck so I wouldn't be surprised if there are more leaks in my pcv system. I have ordered a catch can kit so that I can get rid of all the old stuff and know that there are no leaks coming from there.

I'll also be getting rid of the 008 forge dv on the car and replacing it with a stock dv. I'll run some more logs once I've done these things to see if there are any improvements.

As for the tune in the car, I have tried comparing it to a stock .bin file and I can see there are differences between the 2 but I don't know enough yet to be able to tell  if it's stage 1/stage 2 or if there is any more I can squeeze out of the car on it's current setup once my other issues are sorted. Are there any resources or guides on how I can figure this out.

read the S4wiki here, if you have time to learn. yes, fitted an original S3 dump valve, changing all the different PCV valves will only do good

I'm also assuming you already checked for boost/dv leaks.

You have some lambda correction activity which is sus.

I've spotted a few leaks in the PCV system which I am sorting out by removing the old system and fitting a catch can. Once the catch can kit arrives and it's fitted I'll be doing a boost leak test to make sure nothing else is leaking and this will hopefully fix my issue where my boost is much lower than the desired.

I done a log today while only using partial throttle to see if it could help me find out why it feels like it pulls harder. When only using partial throttle, by 4000 rpm it's already almost at 18psi of boost compared to the full throttle pull that had only built up under 14psi by 4000rpm. Any idea what would cause it to build more boost while only giving it partial throttle?

Again, I can't see anything obviously wrong, but I will say i have seen similiar behavior and it turned out the turbo inlet was collapsing.