Just a quick question if anyone can help?

I've fitted a boost gauge to a stage 2 sapph and on idle the vacuum (negative pressure) is reading 30 inHg is this Ok! or is there something wrong, I'm sure that I have read somewhere before that most gauges read at about 15 to 16 at idle.

 

yeah my gauge reads 15 on idle but i dont know about if its ok reading 30 sorry m8

 

On most of my turbo rsts and cosworths the needle has been on 8-10 neg on boost gauge.


Can you post a pic of it pleased?



john

 

Here's a photo of it you asked for mate its made by AUTO GAUGE!!!

 

think it should sit about 15or there about it has on my last 2 s2s but maybe differant for cos,hope u get it fixed,tommy

 

I meant a pic of it in your car so i can see what needle is pointing to!!!!




john

 

[quote="rsjohn"]I meant a pic of it in your car so i can see what needle is pointing to!!!!

Sorry no can do John! but to be honest the photo of it in the car would look the same as ubove picture but the needle would be on the 30 inHg.

Also had a play around with it today and noticed that when I pull the vacuum/air hose off from the top of the Dump valve the boost gauge then reads 15 inHg, if anyone has any more ideas! as to what the problem could be please let me know.

CHEERS!!!!

 

what dose it sit at with engine off

 

When I turn the engine off the needle goes back to just under the zero, do you know what governs the vacuum hose preshure???

 

You have got the boost pipe connected wrong on your manifold then?


Can you tell me how you have the pipes connected for the DV, boost gauge and fuel pressure please?





john

 

i think same as john pipe wrong on inlet check all pipes

 

mine idles at -0.6 bar gauge = 20 inHG and that with no air leaks or dump valve.

 

OK lets see if I can explain??

If you think of the outlets on the plenum as North _ East _ South _ West

Map sensor goes to North

the fuel reg goes to East

South is blanked off from the old breather

West goes to the Dump Valve which I have Teed off of close to the plenum for the feed to the Boost gauge.

Is this correct???

 

makes no difference really, all are into the same plennum, they are just there so each one can be directly connected, the order they are piped in makes no difference.