[Ssniper3105]

I'm looking at Atometer sport comp II gauges but I'm wondering why a BOOST gauge can be ordered with a VACUME reading......? I've searced all over the site looking for an explenation.... no luck. I hope I don't get beat over the head for this question.
:think:


Thanks
Jerry

 

[COBRAJET]

Diesels do not incur vacuum...ie negative pressure in the manifold since they have no throttle plates. On gas motors when the turbo is spun up and the driver lets off the gas the turbo continues to spin...as it does in a diesel, but the flow hits a closed throttle plate. This causes the pressure to come back at the compressor wheel. The manifold is now negative. Unless a pop off valve...not a wastegate is employed all boost is loss and the car is as flat as a board when the driver gets back on the gas. Monitoring the negative vacuum allows proper setup of the pop off valve. Purchasing a gauge which reads negative manifold pressure for a diesel is not necessary. Buy a 0-60 and you will be fine for all your needs...unless you have really BIG plans.

 

[Ssniper3105]

No big plans just wondering if it helps to have it. Thanks for the imfo.:bow:

Jerry

 

[Ssniper3105]

Also, is 60 PSI the way to go? I'm not planing to go any further than just a preditor on economy tune.

 

[05LLY2500HD]

Also, is 60 PSI the way to go? I'm not planing to go any further than just a preditor on economy tune.

If you're not changing turbos or upping boost a 35 would be suffecient (sp).

 

[Every Day Diesel]

Good question Ssniper3105,
Why would you need a 0 to 60 gauge I like how easy it is to read the 0 to 35 gauges.

 

[COBRAJET]

Most gauges tend to be most accurate reading middle of the scale. I personally do not like reading a guage that is close to being pegged. It is a preference only.

 

[BudTX]

Good question Ssniper3105,
Why would you need a 0 to 60 gauge I like how easy it is to read the 0 to 35 gauges.

A bigger turbo that increases boost over the stock turbo would require a gauge that reads higher than 35.

 

[saratoga]

You can use a vac/boost gauge, it will just never read on the vac side (or you're idling with a really, really dirty air filter)