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Vx220 Turbo Power Loss At 3500 Rpm


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#1 scrappyloz

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Posted 25 October 2018 - 04:58 PM

Just picked up a vx220 turbo from an auction house.

 

Car has great history and is in decent condition apart from a few paint blemishes. It does have a couple of issues that im hoping someone here can help me with.

 

The car has a stage 2 package fitted by TMS when it was new. Currently the car has an intermittent stumble when idling so i wanted to replace the plugs but im not sure which ones and what gap if its stage 2?

 

Also when accelerating hard in 3rd 4th or 5th gear the car has a noticeable power drop when it gets to 3500rpm all the way through the rev range. I fitted a pro alloy intake thinking this was the problem but it turned out not to be. The problem is also still there when the maf is disconnected. I also noticed then when the car looses power if I lift off and on the accelerator quickly the power all returns. In 1st and 2nd gear there are no problems at all.



#2 siztenboots

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Posted 25 October 2018 - 05:21 PM

peak torque is normally at 3500rpm with the original turbo , this is assuming the wastegate actuator is holding the boost



#3 VegyBS

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Posted 25 October 2018 - 07:51 PM

I suffered very similar issues, turned out to be a split vacuum hose, although other common suggestions are sticky wastegates, actuator issues, boost solenoids.

 

I just spent a day going over the entire vacuum/boost hose system with the intention to do a full replacement. Turned out to be on of the rubber joiners near the vacuum box - replaced and the issue went.



#4 scrappyloz

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Posted 25 October 2018 - 09:47 PM

cheers. I will go over the vacuum lines tomorrow. The fact that the power returns when i lift off and back on the throttle makes me think its possibly the boost solenoid.

 

Does anyone know what plugs i should be using?



#5 scw02102

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Posted 29 October 2018 - 04:36 PM

Stage 2 you can run the standard GM plugs but you can gap them slightly different. Someone else can confirm the gap as I forgot 

 



#6 siztenboots

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Posted 29 October 2018 - 05:00 PM

0.8mm gap , better still get a plug 1 grade colder 



#7 jonnyboy

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Posted 29 October 2018 - 06:25 PM

Various causes

Boost solenoid as mentioned
Perferated or non working recirc valve
Blown aux water pump fuse
Errors in egg to be cleared using op com
Vac pipes

Edited by jonnyboy, 29 October 2018 - 06:26 PM.


#8 scrappyloz

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Posted 29 October 2018 - 07:08 PM

Various causes

Boost solenoid as mentioned
Perferated or non working recirc valve
Blown aux water pump fuse
Errors in egg to be cleared using op com
Vac pipes

 

 

Cheers. All vac pipes are good

Ive ordered a boost solenoid and an uprated recirc valve. 

No faults at all stored in ecu.

 

I will change these two bits later this week and let you know if it fixes it.



#9 scrappyloz

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Posted 29 October 2018 - 07:14 PM

0.8mm gap , better still get a plug 1 grade colder 

 are these the standard ones?

BKR6EIX



#10 jonnyboy

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Posted 29 October 2018 - 07:57 PM


Various causes

Boost solenoid as mentioned
Perferated or non working recirc valve
Blown aux water pump fuse
Errors in egg to be cleared using op com
Vac pipes



Cheers. All vac pipes are good
Ive ordered a boost solenoid and an uprated recirc valve.
No faults at all stored in ecu.

I will change these two bits later this week and let you know if it fixes it.

Check specifically with op com not just a generic code reader.

#11 scw02102

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Posted 30 October 2018 - 10:34 AM

 

0.8mm gap , better still get a plug 1 grade colder 

 are these the standard ones?

BKR6EIX

 

They are not standard but can be used. 
Thats a cooler plug usually used in stage 4 cars but will work in Stage 2..

 

When I was stage 2 I just bought mine from Vauxhall direct was only £5 or so each



#12 siztenboots

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Posted 30 October 2018 - 11:17 AM

grade 6 plug was also specced for VXR220 

 

you don't have to fit the iridium tip plug , copper equivalent will do



#13 james4563

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Posted 30 October 2018 - 03:52 PM

Various causes

Boost solenoid as mentioned
Perferated or non working recirc valve
Blown aux water pump fuse
Errors in egg to be cleared using op com
Vac pipes


Does blown aux water pump fuse really cause this? Is that just cause it'll trigger limp mode?

#14 siztenboots

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Posted 30 October 2018 - 04:26 PM

no it won't



#15 jonnyboy

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Posted 30 October 2018 - 05:42 PM

Not limp mode but it does give the symptoms mentioned in the first post which appears to be boost limitation rather than limp mode (no EML) 



#16 scrappyloz

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Posted 25 November 2018 - 05:45 PM

Just wanted to say thanks. The fault was indeed a torn diaphragm on the recirc valve. 



#17 LeoD

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Posted 06 January 2019 - 06:13 PM

Struggling to source a recirc valve. Can anyone suggest an online place to purchase one. Thanks!

#18 scrappyloz

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Posted 06 January 2019 - 06:17 PM

Struggling to source a recirc valve. Can anyone suggest an online place to purchase one. Thanks!

I got mine of the previous owner

 

But

https://www.courtena...ation-Valve-20T



#19 siztenboots

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Posted 06 January 2019 - 06:44 PM

these are fine , better sized seals compared to the forge ones

 

 

https://www.banggood...ur_warehouse=CN



#20 LeoD

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Posted 06 January 2019 - 08:18 PM

Nice one gentlemen. Much appreciated!




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