Bad Throttle Closure (Lack of Torque)

RabbitOLychee

Specialist
May 23, 2022
56
3
0
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

Lieutenant
Oct 2, 2019
894
1
801
0
UK
Ride
Z4 35i & 335i
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

Specialist
May 23, 2022
56
3
0
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