drtydog Posted June 24, 2007 Share Posted June 24, 2007 hey all i just put a boost guage in my r30 skyline, but i'm not sure if it's reading right...the factory one used to show 4psi when on boost (as high as it went lol) before it mysteriously stoped wrking one day :s anyway i got an aftermarket one but it only reads between 2-3.5psi, but when the cars of the needle points a couple marks below 0...u recon the skyline is just a bit wheezy or my boost guage is incorect? Quote Link to comment Share on other sites More sharing options...
Raizer Posted June 24, 2007 Share Posted June 24, 2007 If its below 0 with the engine off your gauge is inaccurate Quote Link to comment Share on other sites More sharing options...
drtydog Posted June 24, 2007 Author Share Posted June 24, 2007 ok so the guage is prob screwed then? unless they can be adjusted... Quote Link to comment Share on other sites More sharing options...
Dell'orto Posted June 24, 2007 Share Posted June 24, 2007 They can be calibrated, but it depends on what brand it is if its worth it or not. I've found that often Autogage ones are inaccurate, often 2psi or more out. Quote Link to comment Share on other sites More sharing options...
FIAT Posted June 24, 2007 Share Posted June 24, 2007 Even high quality ones can be out by 0.5psi or so, some even autometer can be 1psi out. If they dont sit on 0 with the engine off does not mean they are totally inaccurate on boost. Quote Link to comment Share on other sites More sharing options...
Gaz Posted June 24, 2007 Share Posted June 24, 2007 They can be calibrated, but it depends on what brand it is if its worth it or not.I've found that often Autogage ones are inaccurate, often 2psi or more out. You find the autogage (which is autometer) to be inacurate? My mates one was bang on. Autogauge on the other hand is usually inacurate. I run an autogage one but have never checked my particular one to see if it is accurate. HKS, Greddy etc should be closer to correct as they are a bit more pricey. Quote Link to comment Share on other sites More sharing options...
drtydog Posted June 25, 2007 Author Share Posted June 25, 2007 i think it's one of those auto guage ones from repco...just 2psi seems a lil unlikly even with my l20et skyline lol Quote Link to comment Share on other sites More sharing options...
kpr Posted June 25, 2007 Share Posted June 25, 2007 the few autometer guages ive used, have seemed to read low as well. at least 1psi. Quote Link to comment Share on other sites More sharing options...
Dell'orto Posted June 25, 2007 Share Posted June 25, 2007 They can be calibrated, but it depends on what brand it is if its worth it or not.I've found that often Autogage ones are inaccurate, often 2psi or more out. You find the autogage (which is autometer) to be inacurate? My mates one was bang on. Autogauge on the other hand is usually inacurate. I run an autogage one but have never checked my particular one to see if it is accurate. HKS, Greddy etc should be closer to correct as they are a bit more pricey. Sorry no, I meant Auto gauge (realised that when I was in Pioneer this afternoon ) When I sold my old MR2, I swapped my Auto Meter gauge for a Auto Gauge one, and mysteriously gained 2psi. Also had a Blitz Dual SBC in the car which read boost pressure as well for a reference. Quote Link to comment Share on other sites More sharing options...
isnowi Posted June 25, 2007 Share Posted June 25, 2007 Boost gauges (and any pressure gauges for that matter) are inherently inaccurate, remember they are reading pressure above atmospheric, which means that as you gain altitude (and atmospheric pressure increases) your gauge will read more than you are actually boosting. If your gauge was manufactured (and calibrated) at a higher altitude than where you typically drive, then the gauge will read low. Also remember that the pressure can vary (by up to a couple of PSI) depending on where you take your reading from. Chances are the pressure in your plenum is less than what your turbo is producing (especially if you've got a blinging monstrosity of an intercooler hanging out the front of your bumper) Quote Link to comment Share on other sites More sharing options...
drtydog Posted June 25, 2007 Author Share Posted June 25, 2007 na no blinging fmic yet...just a pipe straight from the turb to the inlet lol mite get a small one hidden behind the bumper just to help with intake temps Quote Link to comment Share on other sites More sharing options...
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