Stuck in VOD for 30sec +

[Rosssub]

Got my secondary off, can\'t find anything wrong with it. ECV is working fine with no visual cracks or problems. Original feels and looks better than the replacement

Original 201,000kms:

Replacement 90,000kms:

Original:

Replacement:

ECV open:

ECV closed:

Original front:

Original rear:

[Eight_dollar]

Looks fine as you say - the turbine wheel looks like the exhaust has been lean tho

[Eight_dollar]

whist the 2ndary is off- check the compressor air intake for restrictions too

[Rosssub]

Ok will do. Is there anything else I can check/test while it\'s apart? I\'m thinking I\'ll just put the original back in, it has no shaft play at all in either direction. The replacement has about 0.5mm play front to back.

[Eight_dollar]

check the ECV on its spindle -( they often come loose )

Photo of turbine looks like either oil leak or crack in heatsheild?

The oil feed banjo bolt in the head must be checked too

[Eight_dollar]

could be photo angle - but is that comp secureing nut tight?

[Rosssub]

The black mark on the heat sheild is burnt carbon/oil, its dry, hard and scratched off. The compressor nut is tight. The ECV is tight on it\'s spindle and hasn\'t moved.

Tomorrow I will check the inlet for restrictions and check all banjo bolts and hoses.

[Rosssub]

It\'s all back together, inlet is clear and clean. All banjo bolts, hoses cleared and cleaned. I guess next thing to try is replace the BBOD? I have a new Zerosports sequential controller to fit but I want everything working right before I put it in.

[Marky]

The way it\'s getting "stuck" in twin mode - and you\'ve ruled out any mechanical reasons - really suggests a solenoid or even ecu problem

Most likely solenoid getting stuck, I guess?

I can\'t remember and CBF reading back through 8 pages - but have you had the bbod out/apart and individually cleaned out all the solenoids?

[Rosssub]

Yeah twice now lol.

[Marky]

I would have burned it / just converted to single by now haha

[Rosssub]

Yip it\'s come close a few times now. But all solenoids are opening/closing and holding pressure.

-Primary boost is perfect

-Secondary removed and inspected/perfect

-Duty solenoid cleaned twice and tested perfect

-BBOD cleaned twice, all solenoids tested perfect

-Vacuum/boost lines cleaned/inspected and tested perfect

-Restrictor pills clean clear and perfect

-ECV inspected and perfect

-IACV inspected and perfect

-Waste gate tested opens/closes perfect

-Down pipe inspected and perfect

-Inlet pipe inspected and perfect

-Boost leaks tested and perfect

-Primary bypass valve (bov) tested and perfect

-Secondary relief valve tested and perfect

-ECU reset 3 times at weekly intervals

-Never had a CEL

But still a massive VOD and secondary boost very slow to rise ???

What\'s the best way to test for exhaust leaks pre turbo?

Might just put the Zerosports controller in and cross my fingers...

[Rosssub]

I installed the new Zerosports sequential controller today, The car is not getting stuck in VOD anymore. Goes from single to twin and twin back to single almost instantly. ;D

But, it\'s still slow to reach full boost in twin mode. Twin turbo boost does rise twice as quick as it was but still takes about 5 seconds to reach full boost.

Edit: The more I drive it the better it\'s getting, secondary boost is now pretty much as responsive as primary boost. VOD change over from single to twin takes around 1 second. Which suggests my original problem was with the ECU?

[Marky]

Well that\'s weird

Least it got fixed

I have a factory ecu which had no probs sitting here if you feel the need

[Rosssub]

Thanks Marky, seems to be going fine now. Finally lol, definitely been a good learning curve though. Thanks to all for the help