wont boost past 10psi

mtxfrk2k1 · 03-31-2006, 12:24 AM

i have:

vf22
asp front mount
stock modded injectors to 740cc
walbro 255
erz turbo back
erz up pipe
tuned with enginuity.

i try to set boost map up to 20psi but it still only goes to 10psi.

i switched guages from the stock boost guage to an autometer CF

the old one with my old map showed .12 bar

this guage only shows 10 psi.

what all can it be?

it doesnt feel like its completely boosting.

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White 2.5rs · 03-31-2006, 01:20 AM

wrong forum

Aphex28 · 03-31-2006, 08:02 AM

Try the Factory 2.0L Turbo Powertrain subforum...

Quote:

Aftermarket Forced Induction Powertrain (3 Viewing)

Tech. discussion of powertrain parts & problems for any NON-FACTORY TURBO Subaru that is turbo/supercharged.

(Any turbo/supercharged US Subaru that was naturally aspirated from the facto

qoncept · 03-31-2006, 09:57 AM

Sounds like your boost solenoid is hooked up backwards. 10psi is probably wastegate pressure. It might also be your IAM, have you logged that? If its <= 4, the ECU won't control boost at all.

Master2192 · 03-31-2006, 11:12 AM

Quote:

Originally Posted by mtxfrk2k1

i have:

vf22
asp front mount
stock modded injectors to 740cc
walbro 255
erz turbo back
erz up pipe
tuned with enginuity.

i try to set boost map up to 20psi but it still only goes to 10psi.

i switched guages from the stock boost guage to an autometer CF

the old one with my old map showed .12 bar

this guage only shows 10 psi.

what all can it be?

it doesnt feel like its completely boosting.

I hope it wasn't .12 bar, thats 1.7 psi of boost. Even if it was a mistake and you meant 1.2 bar, thats 17.4 psi of boost. Alittle closer to your boost target.

mtxfrk2k1 · 03-31-2006, 11:49 AM

i meant 1.2 bar.

i havent touched the soleniod ever so i dont see how its backwards.

how do i log the IAM?

where do i do that at?

qoncept · 03-31-2006, 01:24 PM

What are you logging with? Tari has a parameter called advance multiplier. If you can't find that, look at knock correction. If you're seeing a lot of negative values, there's something wrong with your tune.

There is a T in the vacuum line that goes from the wastegate to the boost solenoid. If that's backwards you'll only see wastegate pressure. You definately would have messed with it during the turbo install.

johnnyb · 03-31-2006, 02:50 PM

Exhaust leak?

Check all the little hoses around the turbo, when I had a TMIC installed, one had a small crack and had to be replaced. Easy fix with some vacuum hose. They dry up from all the heat and become brittle.

Aphex28 · 03-31-2006, 03:11 PM

can a mod please move this thread to the correct forum...

Quote:

Aftermarket Forced Induction Powertrain (13 Viewing)
Tech. discussion of powertrain parts & problems for any NON-FACTORY TURBO Subaru that is turbo/supercharged.
(Any turbo/supercharged US Subaru that was naturally aspirated from the facto

qoncept · 03-31-2006, 05:50 PM

Quote:

Originally Posted by johnnyb

Exhaust leak?

Check all the little hoses around the turbo, when I had a TMIC installed, one had a small crack and had to be replaced. Easy fix with some vacuum hose. They dry up from all the heat and become brittle.

You'd have to have a huge leak to be losing 8psi.. That would probably be pretty apparant.

johnnyb · 04-02-2006, 04:01 AM

Defintely a good point qoncept, but still the hoses are worth a look. If the wastegate manifold hose is cracked, your turbo will not operate properly.

03-31-2006, 12:24 AM	#1
mtxfrk2k1 Scooby Newbie Member#: 103401 Join Date: Dec 2005 Chapter/Region: MAIC Location: Pittsburgh, PA Vehicle: 2015 STI White	wont boost past 10psi i have: vf22 asp front mount stock modded injectors to 740cc walbro 255 erz turbo back erz up pipe tuned with enginuity. i try to set boost map up to 20psi but it still only goes to 10psi. i switched guages from the stock boost guage to an autometer CF the old one with my old map showed .12 bar this guage only shows 10 psi. what all can it be? it doesnt feel like its completely boosting. * Registered users of the site do not see these ads.

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03-31-2006, 01:20 AM	#2
White 2.5rs Scooby Guru Member#: 39936 Join Date: Jul 2003 Vehicle: 99RS TWE&SCAT EJ257 Hydra+HMist+PPG+35R=DEATH	wrong forum

03-31-2006, 09:57 AM	#4
qoncept Scooby Specialist Member#: 44762 Join Date: Oct 2003 Chapter/Region: MWSOC Location: Palo, IA Vehicle: 2013 BRZ WRB	Sounds like your boost solenoid is hooked up backwards. 10psi is probably wastegate pressure. It might also be your IAM, have you logged that? If its <= 4, the ECU won't control boost at all.

03-31-2006, 11:49 AM	#6
mtxfrk2k1 Scooby Newbie Member#: 103401 Join Date: Dec 2005 Chapter/Region: MAIC Location: Pittsburgh, PA Vehicle: 2015 STI White	i meant 1.2 bar. i havent touched the soleniod ever so i dont see how its backwards. how do i log the IAM? where do i do that at?

03-31-2006, 01:24 PM	#7
qoncept Scooby Specialist Member#: 44762 Join Date: Oct 2003 Chapter/Region: MWSOC Location: Palo, IA Vehicle: 2013 BRZ WRB	What are you logging with? Tari has a parameter called advance multiplier. If you can't find that, look at knock correction. If you're seeing a lot of negative values, there's something wrong with your tune. There is a T in the vacuum line that goes from the wastegate to the boost solenoid. If that's backwards you'll only see wastegate pressure. You definately would have messed with it during the turbo install.

03-31-2006, 02:50 PM	#8
johnnyb Scooby Specialist Member#: 57593 Join Date: Mar 2004 Chapter/Region: SCIC Location: Stay Classy, CA Vehicle: 2015 Crosstrek XV DGM	Exhaust leak? Check all the little hoses around the turbo, when I had a TMIC installed, one had a small crack and had to be replaced. Easy fix with some vacuum hose. They dry up from all the heat and become brittle.

04-02-2006, 04:01 AM	#11
johnnyb Scooby Specialist Member#: 57593 Join Date: Mar 2004 Chapter/Region: SCIC Location: Stay Classy, CA Vehicle: 2015 Crosstrek XV DGM	Defintely a good point qoncept, but still the hoses are worth a look. If the wastegate manifold hose is cracked, your turbo will not operate properly.