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-   -   Boost gauge (https://www.rx7club.com/2nd-generation-specific-1986-1992-17/boost-gauge-824771/)

arad99 03-08-09 02:30 PM
Boost gauge
 
My boost gauge shows about 20 lbs of vaccuum. Even if I rev the engine up to 3000 - 3500, the gauge stays at about -20 lbs.

Does the engine have to be under load for the boost gauge the show boost?

I've changed the boost sensor and the OEM boost gauge

Spectator 03-08-09 02:33 PM
Originally Posted by arad99 (Post 9027233)
My boost gauge shows about 20 lbs of vaccuum. Even if I rev the engine up to 3000 - 3500, the gauge stays at about -20 lbs.

Does the engine have to be under load for the boost gauge the show boost?

I've changed the boost sensor and the OEM boost gauge
You have to be under boost for the car to show boost. Normally, if you are at WOT from 800rpm, you should be around full boost at 4000rpm depending on your turbine and set-up.


Spec.

Boosted11 03-08-09 02:57 PM
20 lbs of vacuum is about right for idle. The car does not boost sitting still, you have to be moving.

katkaroto 03-09-09 06:45 AM
well, how's the boost over 3500rpms? is it showing anything?

MmSadda 03-09-09 07:39 AM
Um, this should probably be in new member technical.

If you're not really getting on the throttle, and you're just crusing at 3000 RPMs, it IS normal to be in vacuum. If you think there's a problem with the boost gauge, try going WOT and see what it reads out.

arad99 03-09-09 06:26 PM
Originally Posted by katkaroto (Post 9028681)
well, how's the boost over 3500rpms? is it showing anything?
Last fall when I had it on the road, the boost gauge didn't show any boost. So, I changed the boost sensor. Still didn't show boost, so I just changed the instrument cluster. I haven't had a chance to try it on the road yet. My 7 is still covered up in the garage .

Houstonderk 03-09-09 06:31 PM
Is it electronic? Some gauges will stay at a certain spot if not properly installed.

Evil Aviator 03-09-09 09:14 PM
Originally Posted by arad99 (Post 9027233)
My boost gauge shows about 20 lbs of vaccuum. Even if I rev the engine up to 3000 - 3500, the gauge stays at about -20 lbs.
Dang, too bad Mazda never made a service manual which explains how to troubleshoot the boost gauge. However, if they did, it would probably also tell you what that strange "x10mmHg" writing means. Oh well, I guess you are just hosed.

Originally Posted by arad99 (Post 9027233)
Does the engine have to be under load for the boost gauge the show boost?
Dang, too bad Mazda never made a service manual which explains how to check the turbo for boost. Oh well, I guess you are just hosed yet again.

Originally Posted by Travis V (Post 9027276)
20 lbs of vacuum is about right for idle.
On which planet?


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