Guest mk47 Posted November 2, 2006 Share Posted November 2, 2006 Does anyone know the conversion of psi to bar? As far as I knew, around 10psi read 0.9 bar which is about right for stock with 2nd decat? Reason i ask is my boost gauge reads upto 20psi, and after having my fcd fitted today (first decat is still to be fitted, as are plugs) the boost is now 15psi. now is that because i have a cheapo gauge or is it normal? Link to comment Share on other sites More sharing options...
ChrisSZ Posted November 2, 2006 Share Posted November 2, 2006 0.069 springs to mind for some reason. 1bar = 14.5psi (I think) Link to comment Share on other sites More sharing options...
qaisar Posted November 2, 2006 Share Posted November 2, 2006 http://www.britishmetrics.com/html/pis-bar.htm Link to comment Share on other sites More sharing options...
Guest mk47 Posted November 2, 2006 Share Posted November 2, 2006 cheers for that info just another thing.. as i mentioned it now does around 15psi when i boot it, and that on the chart shows as about 1.03bar, so if i add my 1st decat, plugs and restrictor ring will it overboost? Link to comment Share on other sites More sharing options...
GeordieSteve Posted November 2, 2006 Share Posted November 2, 2006 use google (i.e. type 15psi in bar) Link to comment Share on other sites More sharing options...
ChrisSZ Posted November 2, 2006 Share Posted November 2, 2006 http://www.britishmetrics.com/html/pis-bar.htm I was about right then:d Link to comment Share on other sites More sharing options...
terribleturner Posted November 2, 2006 Share Posted November 2, 2006 I always just plug it into google. "22psi to bar" hit search and hey presto"1.5168466 bar" Link to comment Share on other sites More sharing options...
Guest mk47 Posted November 2, 2006 Share Posted November 2, 2006 Ok got the bar/psi thing out the way. does anyone know that by just fitting a 2nd decat and an fcd does it raise the boost more than .9bar? because as far as i knew it wouldnt until i added the 1st decat also? yet now from 10psi its showing 15psi on the gauge? Link to comment Share on other sites More sharing options...
Jake Posted November 2, 2006 Share Posted November 2, 2006 does anyone know that by just fitting a 2nd decat and an fcd does it raise the boost more than .9bar? Huh? Read that back to yourself Maz. It doesn't make sense to me. because as far as i knew it wouldnt until i added the 1st decat also? yet now from 10psi its showing 15psi on the gauge?Quite possible. Results vary from car to car. Exhaust flow (and therefore back pressure) is one consideration. Link to comment Share on other sites More sharing options...
Guest mk47 Posted November 2, 2006 Share Posted November 2, 2006 Huh? Read that back to yourself Maz. It doesn't make sense to me. Quite possible. Results vary from car to car. Exhaust flow (and therefore back pressure) is one consideration. Sorry mate will try that again. stock boost is around 0.8bar right? Now when i had my 2nd decat fitted it didnt go up by much at all, if anything it was showing 0.9bar, and today after having my fcd fitted its showing 1.03bar on the boost gauge, even though my 1st decat is not yet fitted. I have a restrictor ring, only thing im worried about is when i have my 1st decat fitted will it overboost? I dont want to blow the turbos etc.. Link to comment Share on other sites More sharing options...
Homer Posted November 2, 2006 Share Posted November 2, 2006 If you have just over 1 bar with the 2nd cat out then you will almost certainly see 1.2 bar and over with the 1st one gone. You will need the a properly sized restrictor ring to keep it to 1.1/1.2 bar. Link to comment Share on other sites More sharing options...
Jake Posted November 2, 2006 Share Posted November 2, 2006 Yes stock is around 0.8 bar somewhere. It seems to vary a bit. So you're saying that the max boost level you're seeing has changed from 0.9bar to 1.03bar and the only thing different on the car is the FCD? Well the FCD can't affect the boost level like that so I guess it's just down to atmospheric conditions. It is bloody cold out at the mo, so the air is denser. That's my bet anyway mate. Link to comment Share on other sites More sharing options...
Guest mk47 Posted November 2, 2006 Share Posted November 2, 2006 If you have just over 1 bar with the 2nd cat out then you will almost certainly see 1.2 bar and over with the 1st one gone. You will need the a properly sized restrictor ring to keep it to 1.1/1.2 bar. i have a ring that i bought with the decat pipe which measures 45mm / 1.77inches diameter. would that be about right to maintain between 1.1/1.2 bar? Yes stock is around 0.8 bar somewhere. It seems to vary a bit. So you're saying that the max boost level you're seeing has changed from 0.9bar to 1.03bar and the only thing different on the car is the FCD? Well the FCD can't affect the boost level like that so I guess it's just down to atmospheric conditions. It is bloody cold out at the mo, so the air is denser. That's my bet anyway mate. i thought that at first aswell but im just trying to explore all my options before having to resort to a boost controller at this point Link to comment Share on other sites More sharing options...
Jake Posted November 2, 2006 Share Posted November 2, 2006 You'll have to just try it and see what boost you get with both decats and the restrictor and take it from there. Even if you're lucky and the restrictor size is correct for your car in cold weather you will find that the boost level is much lower in hot weather. In which case you would still need a boost controller to raise the boost up to the level you want. Either that or put up with the lower boost on hot days. Link to comment Share on other sites More sharing options...
Guest mk47 Posted November 2, 2006 Share Posted November 2, 2006 hmm well if all goes to plan then ill be getting the first decat and plugs fitted tomorrow. i suppose if its ok for now i will get a boost controller before winter is over. only reason im trying to avoid it at the moment is im looking to get a few bits for the body aswell at the same time Link to comment Share on other sites More sharing options...
matt k Posted November 3, 2006 Share Posted November 3, 2006 You'll have to just try it and see what boost you get with both decats and the restrictor and take it from there. Even if you're lucky and the restrictor size is correct for your car in cold weather you will find that the boost level is much lower in hot weather. In which case you would still need a boost controller to raise the boost up to the level you want. Either that or put up with the lower boost on hot days. UK cars don't suffer from this. Link to comment Share on other sites More sharing options...
Jake Posted November 3, 2006 Share Posted November 3, 2006 UK cars don't suffer from this. UK cars don't suffer from what? Link to comment Share on other sites More sharing options...
Guest mk47 Posted November 3, 2006 Share Posted November 3, 2006 Indeed mine is J/spec. Link to comment Share on other sites More sharing options...
matt k Posted November 3, 2006 Share Posted November 3, 2006 UK cars don't suffer from what? Overboosting due to the MAF! Link to comment Share on other sites More sharing options...
dangerous brain Posted November 3, 2006 Share Posted November 3, 2006 A boost controller won't hold the pressure down. It will only allow you to increase the boost. Without a restrictor ring my old car used to overboost to around the 1.5 bar marker. Link to comment Share on other sites More sharing options...
Jake Posted November 3, 2006 Share Posted November 3, 2006 Overboosting due to the MAF!I'm not sure what you're getting at Matt. You quoted my post but I wasn't talking about over boosting Wild guess; do you have a UK spec, Matt? Link to comment Share on other sites More sharing options...
Jake Posted November 3, 2006 Share Posted November 3, 2006 A boost controller won't hold the pressure down. It will only allow you to increase the boost. He knows that. It's not what he's asking. (I think) Link to comment Share on other sites More sharing options...
Homer Posted November 3, 2006 Share Posted November 3, 2006 Overboosting due to the MAF! wtf are you on about! Link to comment Share on other sites More sharing options...
carl0s Posted November 3, 2006 Share Posted November 3, 2006 Going back to the original query, Maz why don't you try removing your restrictor ring and see how you go then? You might find that the CAT works as a fine restrictor on its own. Link to comment Share on other sites More sharing options...
Guest mk47 Posted November 3, 2006 Share Posted November 3, 2006 See carlos at the moment ive not even got the restrictor ring fitted. just the 2nd decat and an fcd. i suppose yes the weather etc could be a factor as to why its boosting higher, but on my way down to the place yesterday it wasnt boosting over about 10/11 psi, and then on the way home after having my fcd fitted its doing 15/16psi. Link to comment Share on other sites More sharing options...
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