Overboosting?

[jas98]

As some may know ive had miss fireing issues with my ba xr6t stock tune etc. I fixed that with new spark plugs and coils. 

 

However I still have a problem that feels kinda like coils but im almost certain its not as for 1.. I swaped with a known good set and it was same. And 2 car still revs up to 4-5000rpm easy and smoothly when giveing it some.

 

What issue I have is when giveing it allot like a really hard take off I get to 100kph quick but it feels like ot surges slightly when its up to aboit 90kph and accelwrating..and I look accross and I see 7-8 psi on the boost guage when it does this... its normally 5-6.

 

So does that sound like its boost cutting? Ive also swapped fuel pumps and same issue.

 

I have had overboost problems in past where it has hit 11psi and shut power amd I had to pull over and restart it....But this is a bit different as it still drivea fine after it does it..im thinking actuator has a slight leak? Someone said to me valve springs...but it only stock.. 

 

To me it feels like traction controls kicking in but theres no.loght on dash when it does

Edited 10/04/19 01:58 PM by jas98

[k31th]

even stock tune can cause valve springs to go soft over time, especially if it's making more than stock boost quite a lot...

 

but I doubt it's boost cut at 7-8psi, as you need 10 or more for boost cut, I think.

 

it does sound like the actuator is leaking, though. the injectors may not be keeping up with 8psi.

[jas98]

Thanks. I was thinking valve springs for a bit. It does have 332 000ks lol

 

Whats best way to test actuator as im haveing a mined blank haha I trated it once before when installing a new on (stock one) can I used vacume presaure as I donhave a vacume tester.

 

The actuator in it is about 5 year old and stick garrot one 

[k31th]

to test the actuator, you apply pressure from a compressor and it should open on 5-6psi

[Bazza11]

Hi jas how did you end up fixing this problem because I have the same problem.

 

I have had overboost problems in past where it has hit 11psi and shut power amd I had to pull over and restart it....But this is a bit different as it still drivea fine after it does it..im thinking actuator has a slight leak? Someone said to me valve springs...but it only stock.. 

[jas98]

Original issue similar to yours was a combination of 2 things at time ...stuffed actuator and a stuffed cat as the cat was half blown through.