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Old 10-16-2001, 10:58 AM   #1
WRBLUEWAGON
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Question I get full boost 15.14 psi Peak in first and Sec. Gear???

I have done a search on this and people are saying that they only can boost up to 10 psi in first and second gear. Is something wrong with my car? It drives fine and feels fine. Or is something wrong with there cars. Now this is only peak not constant. (I have a peak display on my boost gauge)

I only have a TT and a TURBO XS BOV. No MBC or Unichip.

Any Help would be great.

Eric
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Old 10-16-2001, 11:03 AM   #2
JenisonWRX
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Where do you have your gauge tapped too?
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Old 10-16-2001, 11:06 AM   #3
WRBLUEWAGON
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In between the BOV and Manifold.

Eric
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Old 10-16-2001, 02:04 PM   #4
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Eric,

Doesn't your gauge read out in kPa? If so, like I mentioned before, you're looking at the wrong unit of measurement.

kPa / 0.14504 = PSI

I think you mentioned that you were getting a max of 1.05 in 1st and 2nd, right?

1.05 / 0.14504 = ~7.23 PSI

Or, about right with everyone else who is seeing 7-10 psi in 1st/2nd gear.

Dude, just get an MBC already :-D

As always, corrections are welcome.

- Andrew
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Old 10-16-2001, 02:25 PM   #5
WRBLUEWAGON
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Your killing me man,,

1.00hkPa=14.7

14.7 psi is = to atmosphric persure

so I got 1.06hkPa

=15.582psi in first gear. +- .20

I checked my old books and called up a few tech's on this one. I'm right but corrections are very well come.

Plus than my car would be really messed up because I boost that in 3rd to 5th.

Blitz on there web site said that it can read up to 2.50kpa = 36.75 psi

so 36.75 divided by 2.50 = 14.7psi

14.7psi times 1.06 hkPa= 15.582psi

That is all at peak, So it might have just touched it for a spit sec.

I will show you tonight.

Eric
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Old 10-16-2001, 02:43 PM   #6
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Wrong.

2.5 bar = 36.75 psi.

My math was slightly in error before, kpa X 0.14504 = PSI.

But 1 psi = ~6.89 kpa, so it's definitely either being expressed in the wrong unit, or you need new glasses
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Old 10-16-2001, 02:58 PM   #7
WRBLUEWAGON
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Yourrrr Wrrrrogggg!!!!

I done with you. Anyone else have any idea's or corrections.

Please help.

Eric
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Old 10-16-2001, 03:17 PM   #8
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The only descrepency [sp?] I see is the h in front of kpa...

My metric units are a little rusty, but isn't that hectares, as in 10 to the sixth power?

That would make it 10,600,000 kpa, roughly equivalent to 1,537,424 psi

But, just to prove that I'm right, () here's a conversion chart :

http://www.fife.com/conv.htm

or a simple formula :

http://www.plasticsgroup.com/profess...rsion_factors/

[edit : just wanted to add, 1.06 kpa is actually 0.1537318 psi.]
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Old 10-16-2001, 03:22 PM   #9
WRBLUEWAGON
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I will show you tonight.


Eric

EOM
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Old 10-16-2001, 03:53 PM   #10
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According to my engineering reference,

1 kPa = 0.145 psi or
1 psi = 6.895 KPa

Therefore, if you are truly reading 1.06 KPa, then you only have 0.154 psi of boost!!!

I suspect there is some confusion over your meter's measuring units. Are you certain the gauge is not reading in "bar" measure instead of KPa?

1 bar = 14.5 psi = 100 KPa

Or maybe your gauge reads 100 X KPa (100 X 1000) or in MPa, mega, or 100000 X Pa (I believe Subaru's gauge reads in MPa)

Either way, our soobs are known to limit boost in first gear - I can't remember if it limits 2nd. Fairly certain someone mentioned only 9 psi of boost max in 1st instead of the advertised 14 psi. Supposedly TurboXs' Unichip removes this limit and up boost a bit.

Hope this helps. Cheers
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Old 10-16-2001, 04:02 PM   #11
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Stop arguing about the maths. zoomzoom is correct. And I don't know what boost gauge you're talking about, but the Subaru OEM ones read in MPa. Max boost should be just under the .1MPa mark [.1MPa = 100kPa ~ 14.7PSI].

So, WRBLUEWAGON seems to be getting higher boost in all gears, especially 1st. I'll have the dealer check it out. Or perhaps your gauge is incorrect.

-Ray
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Old 10-16-2001, 04:04 PM   #12
WRBLUEWAGON
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I just got of the phone with Blitz North America

1.00hkPa = 1 Bar

1 Bar = 14.7

1.00hkPA = 14.7

so 1.06 is what my reading on my Blitz Dual TT DC is = 15.582 psi

1.06hkPa X 14.7psi = 15.582

I get that in first gear as a peak reading.

So my Math is right and the convertion is correct as well.

Now why am I getting more boost in first than other people???

Eric
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Old 10-16-2001, 04:09 PM   #13
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Thanks for your help. But I don't want to go to the dealer because I can't see it being a bad thing. I have full boost in first.. That rocks because eveyone else has to have a MBC to get what I have stock.
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Old 10-16-2001, 04:18 PM   #14
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I was getting the same thing.. It spikes to a little under .1MPa (Subaru Gauge pack) then drops a bit in all gears.. I call it a spike cause 500 RPMS has to be a spike.

I installed a MBC and set it for .1MPa The turbo spools up to .1MPa alot quicker but still drops off in the higher rpms (turbo running our of juice)
Maybe they made changes to later model WRXs? I just bought mine about 1 month ago.


-Zach
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Old 10-16-2001, 04:37 PM   #15
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1.0 Bar

= 1000 mBar (milibars)
= 100 kPa (kilopascals)
= 14.7 psi (pounds per square inch)
= 750.06 mmHg (milimeters of mercury)
= 29.52 inHg (inches of mercury)

1.0 Bar is kind of 1.0 hkPa but that is really not the case because there is no such thing as hecto-kilopascals. It is an error in units. The right way to write it would be 1.0 x 10(2) - i.e. Ten squared kPa.

I don't know html enough to superscript.

It may say hkPa on a gauge, but that just some dumbass calling himself an engineer when he's really the graphic designer that is too stuipid to ask the engineer what the real units are. (Trust me, I work with a couple)

He was using the h (meaning x 100) when you can't really combine metric prefixes that way.

The subaru gauge units of MPa are correct. Those are megapascals 1 Bar = .1 MPa and if I'm not mistaken doesn't the subaru gauge read vacuum and then 0-.1? .

Obscure was wrong- he divided by .145 when he should have multiplied. Everyone else seems to have it straight.

Being Canadian, knowing the metric system appears to be more useful than I once thought.

Kyle
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Old 10-16-2001, 10:35 PM   #16
amelnikov
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Quote:
Originally posted by WRBLUEWAGON

so 1.06 is what my reading on my Blitz Dual TT DC is = 15.582 psi
I get that in first gear as a peak reading.
So my Math is right and the convertion is correct as well.

Now why am I getting more boost in first than other people???

Eric
----------------------------------------------------------------------------------
the reading is correct, it is 15.582 psi, but a peak reading is just that, a peak reading. A spike. Are you saying that it's staying at that boost all through the first, or just spikes to 15.8 and then drops to lower boost?
----------------------------------------------------------------------------------

Alex...
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Old 10-16-2001, 10:48 PM   #17
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*****

I didn't know that MENSA had a forum for cars... j/k

What does your BoCon do when your car is not in use? Track satelites? [sp?]
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Old 10-17-2001, 10:48 AM   #18
Jon [in CT]
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Why does everyone (except zoomzoom) mistakenly believe that 1 bar = 14.7 PSI when, in fact, 1 bar = 14.5 PSI?
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Old 10-17-2001, 11:00 AM   #19
Greenracer6
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Default PSI

Maybe you should hook up a US psi gauge and see what it says, instead of using a bar or metric boost gauge.

Also, if you want a boost controller so you can run 16psi @ all gears full boost. I took my Apex-i AVC-D off b/c I'm getting a Link

$225 if you want it, retails for $330

Bill
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Old 10-17-2001, 11:03 AM   #20
TypeC
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Quote:
Originally posted by Jon [in CT]
Why does everyone (except zoomzoom) mistakenly believe that 1 bar = 14.7 PSI when, in fact, 1 bar = 14.5 PSI?
probably because .2 psi is so small it's not worth arguing about. I've always heard 14.7psi, but never bothered to check my books because it doens't really matter.

-C
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Old 10-17-2001, 11:05 AM   #21
WRBLUEWAGON
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Your right 14.7 = 1bar.

But bar does not show - for vacume. That's what Blitz told me
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Old 10-17-2001, 02:25 PM   #22
Jon [in CT]
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Wow, you just did it again! 14.5 = 1bar.
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Old 10-17-2001, 04:51 PM   #23
solomrus
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autometer sport comp boost gauge:

-18 = 18 inches of vacuum

+15 = 15 psi of boost.

no conversion. no question.

(just being a smartace)

:monkey:
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