correct reading on pressure gauge
Turbo Mini Forums

hi there

maybe it is silly question, but haven't used them before :(
i have mini metro turbo engine, standard except damp valve.

So what is normal reading on oil pressure/ oil temperature/ petrol pressure/ air and flue ratio gauge? (cold/hot engine, low boost/high boost) what i need to know more to make this gauges work properly not just for design

And what useful info can i get from Voltmeter Gauge and Vacuum Gauge?

And this Air/Fuel Ratio Gauge i need to connect to Lambda Sensor? and then i can correctly regulate mixture in my carburettor? :)

Thank you

Nothing special!

Vacuum gaige is pretty pointless on a turbo engine lol, you want a boost gauge instead, and it telss you how fast you could be going Volt meter will tell you that the alternator is charging when its above 12v and tell you that you are draining your battery when its 12v or less. Simply put, it does the same as an ammeter but without the big chunky cables and risk of fire.

Lambda gauges have been discussed loads lately, try a search, but by the sounds of it you are talking about the narrow band veriety which cost around £50 all in. They are ok for something to look at on your dash and be amazed at how much it flashes back and forth as you drive, other than this, it tells you little. Wideband AFR gauges cost around £150.

Oil pressure for any A series engine should be aprox 15psi at idle, rising to aprox 60psi normal driving. boost should have no bearing on oil pressure. cold oil will give a higher idle oil pressure which will drop to aprox 15psi as the oil and engine warms up.

yea, definitely i need boost gauge :) i just was thinking what else would be useful to have, to keep all i mint condition :)

what about fuel/petrol pressure gauge? how much it should show when engine running in N gear and what proportion it should grow with boost pressure?

is it worth to install fuel pressure regulator?

thank you for help :)

On 27th Mar, 2010 Sprocket said:
Vacuum gaige is pretty pointless on a turbo engine lol, you want a boost gauge instead, and it telss you how fast you could be going Volt meter will tell you that the alternator is charging when its above 12v and tell you that you are draining your battery when its 12v or less. Simply put, it does the same as an ammeter but without the big chunky cables and risk of fire.

Lambda gauges have been discussed loads lately, try a search, but by the sounds of it you are talking about the narrow band veriety which cost around £50 all in. They are ok for something to look at on your dash and be amazed at how much it flashes back and forth as you drive, other than this, it tells you little. Wideband AFR gauges cost around £150.

Oil pressure for any A series engine should be aprox 15psi at idle, rising to aprox 60psi normal driving. boost should have no bearing on oil pressure. cold oil will give a higher idle oil pressure which will drop to aprox 15psi as the oil and engine warms up.

Nothing special!

You need a fuel preasure regulator, or you would get pump preasure fuel straight to your carb and most likely just permenantly flood it. You would use a fuel preasure gauge to set the regulator to 3.5 to 4 psi. With a turbo, this then rises with boost (e.g. 3.5 psi plus 8psi of boost giving 11.5 psi of fuel preasure).

You can have a fuel preasure gauge permenantly fitted under the bonnet, but I would never consider putting one in the cabin as you would have fuel at a very high preasure inside the car.

Thank you! now i have image what i really need, now just need to search for shop which selling one style gauges :):)

Nothing special!

i decide to go now for boost psi gauge, oil pressure and air/flue mixture gauge :)
black smoke effect, hope it will be good :)



is anyone using them?? hope they work properly 8-)

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i have oi presure and oil/water temps from them seem ok

Yes i moved to the darkside

Instagram @jdm_brett

yea they looks good :) i said that i am mini club member and they gave me 10 pounds discount on 3 gauge set, not bad, not bad :)

Nothing special!