Bad Throttle Closure (Lack of Torque)

[RabbitOLychee]

Hey All!

I've been scratching my head for a bit of why this is happening,

Recently, I've purchased a VRSF 7.5 Race Intercooler and a Cobb Charge Pipe (All fitted), and all recently, I've been missing an additional 240NM of torque roughly from a pull, and seem to notice throttle closure to start happening at the beginning of the 3rd gear pull but near 5.5k it fully opens up to 81% from 39%-43% down low.

I did have traction control fully off (Holding the button for 5 seconds) and was not losing traction at all as I was WOT from down low in 3rd gear.

Had noticed as well, everytime I put my old charge pipe on, it goes like a bat out of hell, extreme amount of torque from the second you WOT and it pulls hard. But ever since I got the Cobb and Intercooler, it seems to have died off.. (This whole problem use to happen with my old charge pipe as well).

- Checked charge pipe for missing O Ring or any gaps, C clips,
- Checked inlets and outlet pipes (None) (No boost leaks)
- Checked vacuum lines (Seem to be all fine)
- ((No codes))

Mods
- Cobb Charge pipe (Fits original diverter valves) (No meth bungs)
- VRSF 7.5" Race Intercooler
- VRSF intakes
- VRSF V2 Downpipes
- Stage 2+ V10 OTS Map
-XHP Stage 3 (Drag Mode)

(All spark plugs, coilpacks replaced recently)

3rd Gear pull log - https://datazap.me/u/rabbitolychee/throttle-closure-lack-torque?log=0&data=2-3-13-14-20-21-22-25-26

Cheers you all Hopefully someone can shed some light on what it may be.

 

[carabuser]

You're just over boosting. Assuming you have stock turbos then either boost solenoids are bad or wastegates are out of adjustment and closing more than they should. You could run a map with higher boost targets or get a custom tune.

 

[RabbitOLychee]

You're just over boosting. Assuming you have stock turbos then either boost solenoids are bad or wastegates are out of adjustment and closing more than they should. You could run a map with higher boost targets or get a custom tune.

Hey Carabuser,

Ahh yes! I had thought about boost solenoids going bad... But I do have really bad wastegate rattle, when you start the car up, it hear it rattle it's ass off for 2 seconds then it's quiet.. When I'm on light acceleration, you can hear it rattle loud but when WOT it's gone..

But I might actually have a look at the boost solenoids as that could be the issue... It goes when it wants to basically, sometimes it's REALLY fast and torquey and sometimes it's lack luster