2G Too much boost

Turboed_talon_tsi · Feb 29, 2024

I recently repaired my header/turbo gasket because it was causing a boost leak. Before it ran fine under boost and only ever reached 16psi with the leak. Once repaired I notice a quicker spool and also a whole lot more boost. Car is reaching way more than it can handle and the motor isn’t getting enough fuel to keep up. I messed with my boost controller and set it as low as possible but the same issue occurred. I think the boost controller is faulty but not sure if it could be something else. Thanks!

curt-s · Feb 29, 2024

No profile, we have no idea what your modifications are. Please create a vehicle profile.

Until you fix your fuel and boost controller issues, bypass your boost controller and plumb the line directly to your wastegate. That will keep it low.

chrysler kid · Mar 1, 2024

you should hook the boost line to the waste gate directly. that will allow it to run minimum boost

what kind of turbo is it, do you have an actual boost gauge

Turboed_talon_tsi · Mar 4, 2024

chrysler kid said:
what kind of turbo is it, do you have an actual boost gauge

okay thanks I’ll try that. It’s a 16g turbo from eBay I believe. Not sure what brand, last owner put it on, maybe cxracing but not sure. Yes I have an actual boost gauge.

evil_eagletalon · Mar 4, 2024

internal or external waste gate?

Turboed_talon_tsi · Mar 5, 2024

evil_eagletalon said:
internal or external waste gate?

Internal wastegate

curt-s · Mar 5, 2024

Have you checked all your boost control vac lines to ensure you didn't accidentally create a hole in one? Sometimes it doesn't take much.

ngerk · Mar 5, 2024

Is boost too high immediately or is it creeping with RPM? This could also help diagnose it

Turboed_talon_tsi · Mar 5, 2024

ngerk said:
Is boost too high immediately or is it creeping with RPM? This could also help diagnose it

Creeps with rpm’s. Once I get up to around 4500-5000k it keeps cutting out because I don’t have enough fuel for the boost.

pauleyman · Mar 5, 2024

Still kind of vague. Are yiu dating it hits a certain boost and stays there and then as rpms rise boost starts to go up? If that description is accurate it's a condition called boost creep.
If you have a full turbo back 3" exhaust and a stock internal wastegate that's a problem. What do you have and is my description accurate?

Justin DuBois · Mar 5, 2024

Lol, you don't have a boost creep problem... You have fuel shortage. You need more supporting mods - like ECM Link, larger injectors - possibly a fuel pump and or a fuel pump re-wire.

pauleyman · Mar 5, 2024

Justin DuBois said:
Lol, you don't have a boost creep problem... You have fuel shortage. You need more supporting mods - like ECM Link, larger injectors - possibly a fuel pump and or a fuel pump re-wire.

That's not necessarily true. We don't have enough info. The description sounds like creep which leads to fuel cut.

Justin DuBois · Mar 5, 2024

pauleyman said:
That's not necessarily true. We don't have enough info. The description sounds like creep which leads to fuel cut.

Exactly - That description does sounds like creep which leads to fuel cut. (That is why I suggest more injector - to reduce the injector duty cycle - to raise the fuel cut threshold)

DSMPT · Mar 5, 2024

Turboed_talon_tsi said:
I recently repaired my header/turbo gasket because it was causing a boost leak

What he repaired is exhaust leak, not boost leak. I don't know how much it was leaking but if the boost controller has been set with the exhaust leak, he may see higher boost after repairing the exhaust leak with the same controller setup. And if his setup was causing boost creep before, then maybe he starts seeing the boost creep again.

dwb · Mar 5, 2024

Turboed_talon_tsi said:
also a whole lot more boost.

How much boost exactly? How do you know you're running out of fuel and not just a spark issue?

Turboed_talon_tsi · Mar 5, 2024

dwb said:
How much boost exactly? How do you know you're running out of fuel and not just a spark issue?

My boost Gauge says it’s bouncing past 20-25psi. I don’t think it’s a spark issue because I have a stock fuel pump and injectors and know they can’t handle that much. I’ll post a video in the tread below

You must be logged in to view this image or video.

dwb · Mar 5, 2024

Ok, so you have no boost control?

Maybe this has been mentioned already, but visually inspect that your wastegate actuator is connected to a boost source and its arm is attached to the wastegate arm.

Going further, do a boost leak test and be sure to include the wastegate actuator. Watch for movement of the wga arm and the arm of the wastegate itself. Also verify the wga holds pressure to check for membrane rupture.

chrysler kid · Mar 5, 2024

the car should only be running 13 psi at most

the stock ecu can only handle 13psi of boost. it doesnt matter what size fuel pump you have or injectors, the stock ecu can only calibrate to 13psi

take a picture of your engine bay.

do you know what a wastegate is? do you know where the waste gate is located?

you dont have a boost controller that is a boost gauge

pauleyman · Mar 5, 2024

Turboed_talon_tsi said:
My boost controller says it’s bouncing past 20-25psi. I don’t think it’s a spark issue because I have a stock fuel pump and injectors and know they can’t handle that much. I’ll post a video in the tread below

You must be logged in to view this image or video.

Are you trying to break it? Don't stay in it when it's like that.

evil_eagletalon · Mar 6, 2024

Triple check your boost controller lines. Post a picture of how it is plumbed.

Pjj · Mar 6, 2024

this is the first time ive heard someone say theres too much boost LOL

Justin DuBois · Mar 6, 2024

Pjj said:
this is the first time ive heard someone say theres too much boost

There are lots of posts that fall under the category of "too much boost" - but they are usually associated with larger turbo's and bent or broken parts and blown head gaskets and melted pistons.

OP seems to have put their finger on the issue.
"Boost good - Fuel cut bad"

Turboed_talon_tsi · Mar 9, 2024

evil_eagletalon said:
Triple check your boost controller lines. Post a picture of how it is plumbed.

Thought I would update. It was a bad line. Had shit stuck in the line restricting airflow. Replaced it and it runs flawlessly, thank you!

The Top DSM Community on the Web

2G Too much boost

Turboed_talon_tsi

curt-s

chrysler kid

Turboed_talon_tsi

evil_eagletalon

Turboed_talon_tsi

curt-s

ngerk

Turboed_talon_tsi

pauleyman

Justin DuBois

pauleyman

Justin DuBois

DSMPT

dwb

Turboed_talon_tsi

dwb

chrysler kid

pauleyman

evil_eagletalon

Pjj

Justin DuBois

Turboed_talon_tsi

Similar threads

Latest posts

Build Thread Updates

Vendor Updates

Latest Classifieds