Over boosting

[Locko90]

Hey guys.

 

Just wondering how would I go about stoping the ecu boost cut when I go over 10 psi boost on my stock ba xr6 turbo

[k31th]

get a tune and appropriate hardware to support more than 10psi.

[Locko90]

I've put a few mods on it allready but it seems that it still spikes too about 10 - 12 psi at around 3500 - 4000 rpm and if I don't back off it hits boost cut and loses all power, goes into limp mode.

Can I get a flash tuner and take the boost cut off?

I want to be able to hold it at WOT and run all gears to red line with out it over boosting and going into limp mode.

[k31th]

doing mods without a tune is just asking for the symptoms you've got.

 

you WILL need a custom dyno tune (whether you get a flash tuner box or not, but you will need a tune flashed to your car at minimum) to suit the mods you've done.

[Locko90]

It was a stock car when I bought it no mods done, but it was hitting boost cut just the same but was abit worse.

 

The exhaust was damaged when I bought the car. Turned out it was restricting exhaust air flow, I had the damaged section cut out and the cat gutted as it was ruptured and parts of the cat were lodged Futher down the exhaust, got that cleaned up and also had the middle muffler deleted.

Car seemed to run alot better after freeing up exhaust flow.

 

But still would hit boost cut if pushed too around 4000 rpm.

 

So I got a boost gauge installed and now I've found if I back it off when I spikes the 10psi it won't cut power.

 

Surely these cars in stock form shouldnt hit boost cut at 4000rpm??

 

Would a tune fix this?

[k31th]

these (a stock BA XR6T) cars won't make 10psi in the OEM configuration.

 

the OEM injectors just don't support much more flow than stock.

[Locko90]

So your saying that it's been previously tuned?
and now it needs a retune to getting it to stop hitting 10 psi or smooth out the boost spike when it's under load or something

[k31th]

that could be one scenario... or it's got a physical situation that is causing it to overboost, for example: an up-rated actuator installed, an actuator stuck closed, boost control not connected correctly or controlling correctly (tune/solenoid/sensor) etc.

[camo86T]

@k31th Regardless of previous dramas, won't extra flow from the gutted cat allow it to hit boost limit way earlier?

Let alone with 'other mods' mentioned

[Locko90]

Okay well where do I find the sensor? Thought it was just a solenoid controlled by the ECU didn't know there was a sensor.

More exhaust flow is better for turbos I thought?

 

I guess Ill look into getting bigger injectors / fuel pump ect before a tune.

How do I find out how big the injectors are in my car atm?

also not sure on how to remove them?