Had my car on the rollers and looking at the graph it is boosting to 1.2bar and holding but when I'm driving home the boost guage is only showing about 0.6/0.7bar but it doesn't feel any slower. Could this be a faulty gauge as it did use to show about 1.2bar but doesn't now

 

Swap for a known correctly working gauge to rule in or out.

Prob a faulty gauge if you feel it's as fast as it was prior to going on the rollers. You would defo feel the car being flat/reluctant at 0.6/0.7bar when compared to 1.2bar...

 

Yeah i'll try a new guage, is it just a case of puling the old guage out and pushing the new one on th eexisting pipe? cheers for the quick reply

 

Yeah. Make sure you get hold of a regular mechanical one (not a electro-mech one) and that way you can quickly pull off the vac hose to your existing one and pop onto the tester gauge. (Any illumination wiring it might have, dont worry about that...)

 

http://cgi.ebay.co.uk/AUTOGAUGE-52mm...es_CarParts_SM

is that ok

 

If it's a purely mechanical one i.e. accepts the raw analogus boost signal from inlet manifold, then yep.

 

i have prosport one and it has a seperate sender unit connected to the gauge, the vacuum pipe goes to the sender then the sender is connected to the gauge electrically via a long loom.
so may not be as easy as you think

 

That's what I mean!

If he gets a mechanical one - i.e. NOT an electro-mech. one like yours - then it does away with that electrical gubbins that turns the raw boost signal into an electrical signal.

So he won't have to worry/have the hassle of wiring that part up. All he'd have to do - if he gets a purely mechanical one - is pop on the vac hose and he's good to go for a boost reading...