Inaccurate boost gauges!
08-03-2005, 05:13 PM
#1
10K+ Poster!!
Thread Starter
Inaccurate boost gauges!
had my car on the rollers last week only yo find it was holding 25 psi when the boost gauge was reading only 21. 
anyone else has this prob with normal mechanical gauges?
got my self a pukka SPA digital combined oil and boost now....wasnt cheap tho!
anyone else has this prob with normal mechanical gauges?
got my self a pukka SPA digital combined oil and boost now....wasnt cheap tho!
08-03-2005, 05:19 PM
#2
Professional Waffler
I had a TIM guage years ago that told me I was boosting at 1bar and the first time it went for a tune up I found it was running 11psi. Some 3.5psi out. Least it was an over reading guage and not an under reading one
08-03-2005, 05:27 PM
#5
Professional Waffler
Originally Posted by b19bal
pmsl @ steves "tim" gauge
08-03-2005, 05:31 PM
#6
yeah my boost gauge was all over the shop the other day when Tom Scarlett was sorting my car out. The oil gauge he was using was always reading the same boost where as my one went anything from 15 - 20+ psi 
Anyone know any good spot on boost gauges that can fit into a twin piller pod?
Anyone know any good spot on boost gauges that can fit into a twin piller pod?
08-03-2005, 05:33 PM
#7
Professional Waffler
Autometer ones are pukka.
Seem to remember my bro having to mod his slightly to get it to fit in his A pillar pod. His was on a FRST though so you may be fine
Seem to remember my bro having to mod his slightly to get it to fit in his A pillar pod. His was on a FRST though so you may be fine
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08-03-2005, 06:41 PM
#9
Oh yeah... When a first bought ma fiesta the old gauge was reading 5 psi.. Got boost turned up and place i took it to were at it for ages until they realised gauge was screwed and was permenantly reading 5 psi.. Digi one on the way.. Still got a mechanical one in it the now..
10-03-2005, 05:21 PM
#10
10K+ Poster!!
Thread Starter
must say do like my SPA digital one. loads of features like high boost limit light and low oil press light.
you can change it to read in bar or psi.
lights up green or red.
recall your max and averges.
you can link up other external lights and sensors to it too.
very accurate as it works off proper electronic sensors. no vaccum pipes etc.
accurate to 0.0001 psi while tested at 232psi so the spec sheet says.
you can change it to read in bar or psi.
lights up green or red.
recall your max and averges.
you can link up other external lights and sensors to it too.
very accurate as it works off proper electronic sensors. no vaccum pipes etc.
accurate to 0.0001 psi while tested at 232psi so the spec sheet says.
10-03-2005, 06:27 PM
#17
PassionFord Post Whore!!
Originally Posted by rapidcossie
spot on now davie boy.
holding 21 no probs and going pretty damn quick. will give a few passenger rides on sun if its dry!
holding 21 no probs and going pretty damn quick. will give a few passenger rides on sun if its dry!
need you to make up my mind to sell my car
im gonna have to watch through there.sure the police are out to get me now through there
10-03-2005, 06:39 PM
#19
It Wasnt Me!
Euan, we'll jus have to go Fq400 hunting 
sure wont take long to find one 
!
Dave - bean tin / fast mint sapph, dont really need a ride in one to work out what to pick
sure wont take long to find one !Dave - bean tin / fast mint sapph, dont really need a ride in one to work out what to pick
10-03-2005, 06:56 PM
#21
PassionFord Post Whore!!
Originally Posted by vroooom ptssssh
Dave - bean tin / fast mint sapph, dont really need a ride in one to work out what to pick
need someone to make it look like ive a got a quick car
10-03-2005, 06:59 PM
#22
It Wasnt Me!
Euan, yup weather no doubt will be crap. . the Evo owner will get a surprise when its dry tho
yours is pretty quick already dave, jus needs an AVA set up getitfugginsorted!!!!
not taking mine up, still neesd oil/oil return pipe and a licensed driver called vroooom ptssssh
yours is pretty quick already dave, jus needs an AVA set up getitfugginsorted!!!!not taking mine up, still neesd oil/oil return pipe and a licensed driver called vroooom ptssssh
10-03-2005, 07:06 PM
#23
PassionFord Post Whore!!
Originally Posted by vroooom ptssssh
yours is pretty quick already dave, jus needs an AVA set up getitfugginsorted!!!!
was just going through with duxrs he was getting some stuff done to his.
you can ask him if i need an AVA tune up
sorry duxy
10-03-2005, 08:24 PM
#24
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I think the reason the mechanical gauges are often inaccurate is due to them being sensitive. Eventually the high / low pressure cycles will cause the metal to change its properties. I think most are not very accurate to start with.
I use map sensors for my display, as most are quite accurate. I have found that even secondhand sensors still are very accurate, even after a many years of use. (within 0.5 psi !!!!)
The webber sensors are best, being normally accurate to 1%.
I find that the GM map sensors are not very nice at all! - lots of variation on each one!
Whenever you buy any display, gauge etc, it is best to use one with the lowest possible range, 1% error on a 2 bar gauge is less than 1% error on a 3 bar guage!
Darren
I use map sensors for my display, as most are quite accurate. I have found that even secondhand sensors still are very accurate, even after a many years of use. (within 0.5 psi !!!!)
The webber sensors are best, being normally accurate to 1%.
I find that the GM map sensors are not very nice at all! - lots of variation on each one!
Whenever you buy any display, gauge etc, it is best to use one with the lowest possible range, 1% error on a 2 bar gauge is less than 1% error on a 3 bar guage!
Darren
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