If anyone can provide any feedback, that would be great!

This is from a 3rd gear pull from around 3600k and my issue is when it starts to hesitate/stall around 4600k. What could be causing this to happen? This does happen in 4th gear WOT as well. I haven’t noticed anything like this in 1st and 2nd gear doing WOT.

I have spent hours reading forums trying to figure it out and tried looking up videos on YouTube but my issue doesn’t seem as aggressive as the ones I saw or read about.

I have an Invidia q300 dual exhaust and a ETS intake (intake came with BOV recirculation hoses). I currently don’t have a tune.

Is this a fuel cut due to overboosting? If so, does this mean a pro tune would eliminate this issue?

Is my clutch going bad?

Any feedback would be appreciated. Thank you.

Link to video: https://imgur.com/a/P6Zpgw8

 

It's challenging to diagnose a car problem like this without being able to see, hear, or test the vehicle, but I can give you some general possibilities to consider:

1. Overboosting: It could potentially be a fuel cut due to overboosting. Without a proper tune, the engine control unit (ECU) might be seeing boost levels higher than what it's programmed to safely allow, causing it to cut fuel to prevent damage. A professional tune could help with this, as it would adjust the ECU to work properly with the increased airflow from your aftermarket intake and exhaust.

2. Fuel System: It could also be a fuel delivery problem. If your fuel pump or injectors are struggling to supply enough fuel at higher RPMs, this could cause a similar symptom. The ECU might be trying to add more fuel than your fuel system can supply.

3. Clutch: If your clutch was slipping, you would typically notice a rise in RPM without a corresponding increase in speed. It doesn't sound like this is what you're describing, but it's something to consider.

4. Ignition or Spark: You could be facing an issue related to spark plugs or ignition coils. If they're unable to provide a strong enough spark at higher RPMs, it could cause hesitation.

5. Airflow Issues: The aftermarket intake might be causing some air metering issues leading to the ECU misinterpreting the air/fuel ratio.

Given that this issue is happening at higher gears and high RPMs, it seems like it's an issue that only occurs under high load. This points more towards a fueling, spark, or possibly an overboost issue.

The best way to know for sure would be to get a data log of what's happening when the problem occurs and possibly get a diagnostic run by a professional who can check fuel pressure, boost pressure, ignition performance, etc. A professional tune could potentially help, but if there's a mechanical issue causing this, the tune won't fix the problem and could possibly make it worse. It's best to diagnose and fix the underlying problem before getting a tune.

 

This happened to me for a silly reason.

If you are running a stock air box there are two small plastic pins in the forward facing air horn that connects to the top half of the air box. The screws fail over time and with filter replacement. While waiting for new screw / push pins to arrive I ran without them.

At full throttle the car almost shut down, let off and it was fine.

What was happening was the forward facing air horn was being sucked up against the hood due the draft from the turbo. This shut down the intake and strangled the engine.

Got and replaced the two screw / push pin retainers and no more problem.

Take a look at yours, those plastics retainers are critical with the stock air box system.

 

Thanks for the advice, I will keep it in my mind.