Vacuum Line Pressure Help (boost Gauge)

[nitestalkr]

Hi Guys..

I have done a search but couldnt find anything relevant.

I need to know if any changes occur to the accuracy or responsivness of a boost gauge if the diameter of the vacuum line that feeds it is increased.

The increase would only be small (ie/ 2.5mm to 3 or 3.5mm).

Am i correct in thinking because it is a closed circuit of air that the responsiveness may suffer but the gauge will still eventually be accurate?

Let me know your thoughts.

Cheers,

Daniel

[Sydneykid]

Standard boost answer, more air in the system = slower response.

Cheers

Gary

[GeeTR]

nitestalkr, unless ur talking bout hoses feeding a input system like a map sensor (which can be mounted close to the pressure source anyway) i wouldn't worry bout the v.small +/_ in response time. How often are you looking at the gauge when quick pressure changes are occurring? I think a gauge is really only a rough indication anyway, specially when the needle is moving quickly.

Again, this doesn't apply to A>D conversion, like map senders, logging box's etc feeding closed loop systems.

To answer your Q more, many gauge sets come with a small ID nylon line, instead of normal wider vac hose.

Edited April 3, 2008 by GeeTR

[nitestalkr]

Thanks for the replies guys.

To follow on from what you have said, its really the accuracy i was more worried about as im trying to dial in 12psi which is getting to the pointy end for this turbo (standard 34 GTT turbo), and i am relying a fair amount on the end accuracy of the boost gauge to judge this.

Response time isnt a massive concern because as GeeTR eluded to, i dont look at the boost gauge often at all once i have dialled my optimum pressure in. Aftermarket gauge is already behind in response time to the standard one anyway, so really not a concern.

Cheers,

Daniel