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Help Needed - Vxt Compression Test

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#1 Pipo


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Posted 23 July 2019 - 10:38 PM

Hi guys,

I need some info, and after one hour search I'm left a bit confused. as I read several contradiction numbers.


At this moment my VXT is for sale.  In 2 weeks a buyer is coming to check my car.  But as he's coming from abroad, he asks me to go to a service centre to let them make an official compression map of the 4 cylinders. 


I driving a full stock VXT, (2.0 turbo) with no engine modifications whatsoever and only 27.000 km (about 16.800 miles) on the counter.  I only replaced the precat by a straight pipe (second maincat is in place).  And replaced the silencer by a sports silencer of VX-Performance.


What is the factory compression I should read by performing a compression test?


I also suppose a dynorun would show a bit more then the factory 200 BHP ?


Your help will be much appreciated :mellow:

#2 chris_uk


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Posted 24 July 2019 - 01:00 AM

i think its about 175psi.. 


different gauges can sometimes read high/low.. the important thing is that they are all within X across all 4. 

#3 Nev


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Posted 27 July 2019 - 05:31 PM

170 PSI is good, 150 PSI is acceptable. That is with oil on the rings and at normal operating temps.

#4 hairy



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Posted 27 July 2019 - 10:10 PM

170 PSI is good, 150 PSI is acceptable. That is with oil on the rings and at normal operating temps.


Yes agreed


Some background info for you: https://www.vauxhall...l-engine.71683/

#5 scw02102


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Posted 20 August 2019 - 06:50 PM

I had mine checked a few moths ago

I got 175psi to 180psi on all 4 cylinders
Apparently that was good (2.0 turbo) so anywhere near that would be ideal

Test takes a few minutes but I would say around 30 mins start to finish including taking the plugs out etc

Edited by scw02102, 20 August 2019 - 06:51 PM.

#6 Matthew Bentley Racing Ltd

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Posted 21 August 2019 - 08:32 AM

As Above,


Anything 150PSI over is perfectly acceptable. Its more important that they are within 5-10psi of each other - thats what would put a buyer off.



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