Jump to content
SAU Community

Recommended Posts

]mines actually on +5 on idle...(auto) and jumps to 20 when i rev out its a mechanical cobalt series boost/vac gauge i just tap'd it into the line at the front of the manifold like described in a step by step posted on here i know its wrong coz my stock gauge sits in the - and jumps accordingly.. post-84025-0-70170300-1306822304_thumb.jpg

Edited by nismo07

any idea's?

Hmm, not sure. I've always tapped boost gauges directly off the plenum itself. Never really tried to tee it off an existing line. It definitely should be reading somewhere in the negatives on idle though.

Edited by GT32

Hmm, not sure. I've always tapped boost gauges directly off the plenum itself. Never really tried to tee it off an existing line. It definitely should be reading somewhere in the negatives on idle though.

Was thinking maby trying it at the rear where the stock line goes in from the little box right near the brake booster? if i was to pull that off and run the gauge straight in be fine right? doesnt matter if i disconnect the stock gauge at all does it??

Hmm, you could be right. Possibly a faulty gauge. I used to have an Omori boost gauge on my old 32. The gauge looked ancient! Was a mechanical type and I remember it was always 1-2psi out. When I had the car dynoed a few years ago, their dyno chart always displayed 1-2psi higher than what the boost gauge in the cabin displayed. It was probably due to wear and tear though. Is the gauge you're using brand new or second hand?

Hmm, you could be right. Possibly a faulty gauge. I used to have an Omori boost gauge on my old 32. The gauge looked ancient! Was a mechanical type and I remember it was always 1-2psi out. When I had the car dynoed a few years ago, their dyno chart always displayed 1-2psi higher than what the boost gauge in the cabin displayed. It was probably due to wear and tear though. Is the gauge you're using brand new or second hand?

Brand new from autobarn was a cobalt autometer so thought it was quality rofl...

Hmm, could be faulty. Bring it back and exchange it for another one to see if it still does the same thing. I'm not even gonna bother using a conventional boost gauge this time around in my new car. Once my AVC-R goes in then I'll just rely on that from now on to show me how much boost I'm running. :).

also shouldnt the gauge reset to 0 when the ignition is off? it sits on 15+ ??

Sorry, didn't see this. Yes it should revert back to +-0 when the ignition is off. If it sits on +15 then there definitely is a problem lol.

definitely was the gauge lol... funny on the phone to them were trying to blame installation but once they actually looked at it they said "yea its stuffed"... lol dont know how it could be my fault when the needle resets to +15psi and wont go below 5+ anyways yea overnight delivery :)

kool on another note what should the boost be reading on idle?? -7 like the stock gauge?

Different units, the stock gauge reads in mmHg x100 for both positive & negative pressure.

Most aftermarket boost gauge will read in inHg for negative & either PSI or Bar for positive pressure.

15 - 20 inHg is the norm for idling pressure with the car stationary, anything lower than 15 inHg & you may have a leak somewhere.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Just wanted to pop in an update on my setup. The CD swap has been great, I love the mazworks housing for the overall simplicity. I ended up sealing my trans tunnel with a thin sheet of aluminum reused some of the holes on the trans tunnel, and laid some window sealing EPS foam around the edges. Works great, really quieted things down and sealed up the car.  As for the power comment. Right now I am also running about 650whp. with the way the bell housing is attached to the face of the transmission I have zero doubts it would be fine, mainly because the input shaft and main shaft bearings are seated into the bell housing adapter. This means the load is NOT on the bolts to maintain the power, rather into he casing of the bell housing; Yes the bolts are doing some work there, but with both shafts locked in zero worries.  End of the day, the Mazworks solution is the easiest and safest. no need to take your trans to a shop to get milled perfectly, it fits with minimal clearancing, and you can use all your existing clutch and flywheel.  Driving wise the CD has been great compared to the big box, I'll probably swap my final drive at some point. The serial 9 shifter is gooooood, my only qualm is how tight it is, it takes a fair bit to get use to, 5th and 6th are a bit eh/hard to find at times, but maybe I need re-adjusting, and I think my clutch master is very tired and needs a rebuild. 
    • If you are keen, have a look at my build thread. Car is for sale for the right money or straight swap for a F80 M3 LCI.
    • Welcome mate.  No point in over thinking it, buying any one of those cars you mentioned is not a smart or logical choice with the availability of many "better" (re price to performance) cars available to you.  The heart wants what the heart wants, buy whatever it leads you too.
    • Hey everyone! Im so grateful to be apart of this community and ill do my best to be apart of this. Firstly, i'm not disclosing my real name due to in real life circumstances surrounding my privacy and public image (sorry lol) Secondly, The only thing personal I am willing to share is that I'm from Sydney and a descendant of one of Sydneys largest mortgage firms. I got gifted my first ever car, a 2022 Porsche Cayenne and I love it to death. Ive been driving it for about 5 or 6 months now and honestly Im so grateful for my parents for gifting me this vehicle. However recently I've been working my ass off to afford my second car (which I need help deciding soooooo community help me out please?). Once decided, im planning to try modify it myself. Recent I've been thinking about getting a Skyline, particularly a 25GT or GT-V, yes I know overrated as hell, but I'm also considering a Chaser which I recently came to love. However my dream is to one day own a 180SX (So hard to find clean versions and im not really into importing).  Lastly before I send this off, I want to apologize if I sound tacky or pretentious. I try not to and want to genuinely learn from everyone and anyone. (Im no expert in this area) Thanks for reading!
    • I've got three stashed away but it's starting to get silly with the prices 
×
×
  • Create New...