Boost gauge error - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

jamesm · 02-02-2014, 06:55 PM

I've always wondered why my car always seemed to make a bit less power than I expected at a given boost level. Of course it's only ever been on mustang dynos (which I very much prefer over a dynojet), but even then things seemed a little off.

Turns out my $100 prosport boost gauge is quite optimistic (go figure!). I actually checked it against a log today and found that when the gauge reads a bit above 10psi, my actual boost pressure read from the map sensor is 8.5. At 12psi on the gauge it's 9.5, so it gets worse as it goes up.

So I guess the moral of the story is to not trust your boost gauge until you've confirmed it with a log. Especially if it only cost $100

.

FWIW i think prosport gauges are calibrated at 1000ft, which may account for some of the error.

Ironsquid · 02-02-2014, 08:08 PM

Saw the same today with my Nexus 7 setup

sshole · 02-02-2014, 08:26 PM

All my old Prosport gauges (3 boost gauges, because the senders kept breaking; 2 exhaust temp gauges, same thing; 1 oil pressure gauge I couldn't trust the readings) in my WRX were garbage. I would not recommend their stuff to even my worst enemy.

Defi all day, every day.

1stGenBRZ86 · 02-04-2014, 01:19 AM

I see a lot of guys with these gauges. I myself have one analog boost gauge sitting in a box on my desk, lol. It was for a previous project, but I was contemplating to put it in the brz. might just sell it now.

I've been looking into PLX Devices, maybe check them out. Haven't read anything bad about them.

SirBrass · 02-04-2014, 07:25 AM

Aem failsafe widebands are supposed to be pretty good, actually

Sent from my SCH-I535 using Tapatalk

DAMotorsports · 02-04-2014, 12:56 PM

Our AEM has been spot on during every dyno sesion

King Tut · 02-04-2014, 04:41 PM

Quote:

Originally Posted by jamesm

I've always wondered why my car always seemed to make a bit less power than I expected at a given boost level. Of course it's only ever been on mustang dynos (which I very much prefer over a dynojet), but even then things seemed a little off.

Turns out my $100 prosport boost gauge is quite optimistic (go figure!). I actually checked it against a log today and found that when the gauge reads a bit above 10psi, my actual boost pressure read from the map sensor is 8.5. At 12psi on the gauge it's 9.5, so it gets worse as it goes up.

So I guess the moral of the story is to not trust your boost gauge until you've confirmed it with a log. Especially if it only cost $100

.

FWIW i think prosport gauges are calibrated at 1000ft, which may account for some of the error.

Prosport gauge really bro? You have been hanging out with WRX/STI owners too much.

jamesm · 02-04-2014, 05:08 PM

Quote:

Originally Posted by King Tut

Prosport gauge really bro? You have been hanging out with WRX/STI owners too much.

yeah i had it left over from a wrx actually

02-02-2014, 06:55 PM	#1
jamesm Banned Join Date: Mar 2013 Drives: 2013 FR-S Location: Orlando, FL Posts: 2,929 Thanks: 1,166 Thanked 2,293 Times in 1,180 Posts Mentioned: 313 Post(s) Tagged: 4 Thread(s)	Boost gauge error I've always wondered why my car always seemed to make a bit less power than I expected at a given boost level. Of course it's only ever been on mustang dynos (which I very much prefer over a dynojet), but even then things seemed a little off. Turns out my $100 prosport boost gauge is quite optimistic (go figure!). I actually checked it against a log today and found that when the gauge reads a bit above 10psi, my actual boost pressure read from the map sensor is 8.5. At 12psi on the gauge it's 9.5, so it gets worse as it goes up. So I guess the moral of the story is to not trust your boost gauge until you've confirmed it with a log. Especially if it only cost $100 . FWIW i think prosport gauges are calibrated at 1000ft, which may account for some of the error.

02-02-2014, 08:08 PM	#2
Ironsquid King of Kiwi Palace Join Date: Aug 2012 Drives: Faster than you Location: Everywhere Posts: 585 Thanks: 184 Thanked 578 Times in 264 Posts Mentioned: 33 Post(s) Tagged: 0 Thread(s)	Saw the same today with my Nexus 7 setup __________________

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02-02-2014, 08:26 PM	#3
sshole Banned Join Date: Jan 2014 Drives: BRZ Location: VA Posts: 594 Thanks: 201 Thanked 388 Times in 195 Posts Mentioned: 15 Post(s) Tagged: 0 Thread(s)	All my old Prosport gauges (3 boost gauges, because the senders kept breaking; 2 exhaust temp gauges, same thing; 1 oil pressure gauge I couldn't trust the readings) in my WRX were garbage. I would not recommend their stuff to even my worst enemy. Defi all day, every day.

02-04-2014, 01:19 AM	#4
1stGenBRZ86 Senior Member Join Date: May 2013 Drives: 2013 BRZ Location: NYC Posts: 207 Thanks: 110 Thanked 58 Times in 35 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	I see a lot of guys with these gauges. I myself have one analog boost gauge sitting in a box on my desk, lol. It was for a previous project, but I was contemplating to put it in the brz. might just sell it now. I've been looking into PLX Devices, maybe check them out. Haven't read anything bad about them.

02-04-2014, 12:56 PM	#6
DAMotorsports Banned Join Date: Feb 2013 Drives: 2013 Scion FRS "Raven" Location: SoCal Posts: 503 Thanks: 335 Thanked 467 Times in 215 Posts Mentioned: 85 Post(s) Tagged: 0 Thread(s)	Our AEM has been spot on during every dyno sesion

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