Cannot build up boost :(

azerty · 04-17-2009, 03:12 PM

Hi.
I have this strange problem, I cannot raise boost past 0,9-1 bar.
It just doesn't build up.
It is not hitting fuel cut.
I do have a manual boost controller, from Forge, to help me increase boost.
I tried also to fully close the vacuum line to the weastgate, but boost still doesn't build up.
Any ideeas?
Thanks .

azerty · 04-18-2009, 07:01 AM

Hmm...
Let me rephrase that.
How much boost can u make with the stock turbo?

Mahonri · 04-21-2009, 07:45 PM

Sounds like it could be a number of things going wrong. First I would look into your boost controller, make sure its setup right with the ECU.

To answer your other question, I would go as far as 15 lbs PSI max on the stock CT26 turbo. Anything more then that and you get into problems.

Kevin · 04-21-2009, 08:35 PM

i read that 10-11 psi is safe if you are all stock with aftermarket downpipe and exhaust etc
Yea like mahonri said. look into your boost controller first.. and then get back to us.

azerty · 04-22-2009, 03:56 AM

I have tryed before to play with this boost controller, and I got till 17-18 PSI before hitting fuel cut.
Now, I have the Lexus AFM upgrade and upgraded injectors, and I tryed to raise boost again.
I tryed with the boost controller fully closed, and it raised no more then 13 PSI, with it fully opened I achived even lower boost.
I have to mention that when raising to 18 PSI,I didn`t hit the fuel cut, it just don`t raise higher.
And I understand that the stock CT26 is able of far more boost than that, am I wrong?
I will try to change some more hoses, just in case, but I sure would like to know if indeed the stock CT26 can make more boost, and how much?
If I disconect the vacuum hose that goes from the turbo, trough the boost controller to the wastegate, I get the same result of 13 PSI.
Don`t you think that it should have raised and raised....?

04-17-2009, 03:12 PM	#1
azerty 3" Exhaust Join Date: Sep 2007 Location: Romania Posts: 96	Cannot build up boost :( Hi. I have this strange problem, I cannot raise boost past 0,9-1 bar. It just doesn't build up. It is not hitting fuel cut. I do have a manual boost controller, from Forge, to help me increase boost. I tried also to fully close the vacuum line to the weastgate, but boost still doesn't build up. Any ideeas? Thanks . __________________ 1988 yelow manual turbo targa HKS ssqv bov Hose Techniques silicon hoses Forge manual boost controller boost gauge K&N FIPK ACT clutch kit HD-G6 Fidanza lightened flyweel 550cc RC Injectors 255lph Walbro Fuel Pump LIPP Lexus AFM Replica 3" turbo back echaust with divorced downpipe and no cats. Aeromotive FPR Aem Uego Wideband Gauge+O2 sensor

04-18-2009, 07:01 AM	#2
azerty 3" Exhaust Join Date: Sep 2007 Location: Romania Posts: 96	Hmm... Let me rephrase that. How much boost can u make with the stock turbo? __________________ 1988 yelow manual turbo targa HKS ssqv bov Hose Techniques silicon hoses Forge manual boost controller boost gauge K&N FIPK ACT clutch kit HD-G6 Fidanza lightened flyweel 550cc RC Injectors 255lph Walbro Fuel Pump LIPP Lexus AFM Replica 3" turbo back echaust with divorced downpipe and no cats. Aeromotive FPR Aem Uego Wideband Gauge+O2 sensor

04-22-2009, 03:56 AM	#5
azerty 3" Exhaust Join Date: Sep 2007 Location: Romania Posts: 96	I have tryed before to play with this boost controller, and I got till 17-18 PSI before hitting fuel cut. Now, I have the Lexus AFM upgrade and upgraded injectors, and I tryed to raise boost again. I tryed with the boost controller fully closed, and it raised no more then 13 PSI, with it fully opened I achived even lower boost. I have to mention that when raising to 18 PSI,I didn`t hit the fuel cut, it just don`t raise higher. And I understand that the stock CT26 is able of far more boost than that, am I wrong? I will try to change some more hoses, just in case, but I sure would like to know if indeed the stock CT26 can make more boost, and how much? If I disconect the vacuum hose that goes from the turbo, trough the boost controller to the wastegate, I get the same result of 13 PSI. Don`t you think that it should have raised and raised....? __________________ 1988 yelow manual turbo targa HKS ssqv bov Hose Techniques silicon hoses Forge manual boost controller boost gauge K&N FIPK ACT clutch kit HD-G6 Fidanza lightened flyweel 550cc RC Injectors 255lph Walbro Fuel Pump LIPP Lexus AFM Replica 3" turbo back echaust with divorced downpipe and no cats. Aeromotive FPR Aem Uego Wideband Gauge+O2 sensor

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04-21-2009, 07:45 PM	#3
Mahonri Intake Join Date: Sep 2008 Location: Utah Posts: 34	Sounds like it could be a number of things going wrong. First I would look into your boost controller, make sure its setup right with the ECU. To answer your other question, I would go as far as 15 lbs PSI max on the stock CT26 turbo. Anything more then that and you get into problems.

04-21-2009, 08:35 PM	#4
Kevin 3" Exhaust Join Date: Apr 2009 Location: Ontario, Canada Posts: 194	i read that 10-11 psi is safe if you are all stock with aftermarket downpipe and exhaust etc Yea like mahonri said. look into your boost controller first.. and then get back to us.