Astra VXR Content. Quick question
28 June 2013, 12:14 PM
#1
Astra VXR Content. Quick question
My little brother in law has just had his 09 VXR remapped with a 3" turbo back cobra system. I think he is running to much boost it peaks at 25psi. I followed him the other day and on gear change it kicks out smoke.
What should the PSI be roughly and what could the smoke be.
Cheers
Thought i would ask here before joing the VXR forums
What should the PSI be roughly and what could the smoke be.
Cheers
Thought i would ask here before joing the VXR forums
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28 June 2013, 08:01 PM
#13
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With those mods it will be a stage 2 remap, psi depends who has mapped it but upto 20 at peak, some car when remap at stage 2 had good results with nearly 300bhp.
Vxr owners site are really helpful, I use to have a stage 2 nurburgring edition. Tell him to keep an eye on the manifold as they are prone to cracking and it's a new turbo or secondhand manifold.
Vxr owners site are really helpful, I use to have a stage 2 nurburgring edition. Tell him to keep an eye on the manifold as they are prone to cracking and it's a new turbo or secondhand manifold.
Last edited by baz999; 28 June 2013 at 08:06 PM.
30 June 2013, 08:24 AM
#18
Scooby Regular
I'm an ex-vauxhall fanatic, i know these engines inside and out....
The VXR engine is a Z20LEH and can handle a fair few horses before it goes pop because they added under piston oil jets when remaking from the previous Z20LET, i'd say around 350,
BUT
The turbo they use made by KKK are made out of chocolate, they are a K04-049 and the metal used for the thrust bearing is too soft and wears down due to too much boost, it definitely seems like your VXR is running too much boost as if i remember correctly there only good for upto about 20/22 over boost and holding around 17, if i'm honest i reckon the turbo won't last 12 months!
When being mapped above stage two, you have to make sure you are running good fuel as there prone to melt piston number 3.
The smoke i wouldn't worry about too much if its only as you come onto boost it will more than likely be fuel but should be a blackish colour. They are common for valve stem seals too, but that usually only occurs on over run / idle.
Hope this makes some sort of sense lol
The VXR engine is a Z20LEH and can handle a fair few horses before it goes pop because they added under piston oil jets when remaking from the previous Z20LET, i'd say around 350,
BUT
The turbo they use made by KKK are made out of chocolate, they are a K04-049 and the metal used for the thrust bearing is too soft and wears down due to too much boost, it definitely seems like your VXR is running too much boost as if i remember correctly there only good for upto about 20/22 over boost and holding around 17, if i'm honest i reckon the turbo won't last 12 months!
When being mapped above stage two, you have to make sure you are running good fuel as there prone to melt piston number 3.
The smoke i wouldn't worry about too much if its only as you come onto boost it will more than likely be fuel but should be a blackish colour. They are common for valve stem seals too, but that usually only occurs on over run / idle.
Hope this makes some sort of sense lol
30 June 2013, 08:25 AM
#19
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