Greddy Turbo (can't hold boost)
06-07-2009, 05:12 AM
#42
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Originally Posted by g352s2k,Jun 6 2009, 07:56 PM
I GIVE UP and SELLING THE KIT.
My kitdoesthe exact same thing. Everyone kept telling me that it was my BOV and that I needed to adjust it, not the case. I played and played with the BOV and it is working just fine. My kit was tuned with Hondata K-Pro and I have a Greddy EBC, Greddy Type RS BOV, Berk HFC and stock exhaust. I had the motor tuned to 8psi and made 270whpw/180 ft.lbs.tq. As soon as I hit 6/7K the boost starts to leak! Annoying!
06-07-2009, 07:26 AM
#43
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I had some kind of problem like this way back, if it's not your plugs and your sure the kit is installed and tuned properly then it becomes a PIA to figure out. I just ended up getting a new turbo and mine worked fine after that. Now I want even more power LOL. All I can tell you is most all of us have had one problem or another with our cars so your not alone.
06-07-2009, 07:50 AM
#44
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[QUOTE=Revenge,Jun 7 2009, 10:26 AM] I had some kind of problem like this way back, if it's not your plugs and your sure the kit is installed and tuned properly then it becomes a PIA to figure out.
06-07-2009, 07:54 AM
#45
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Originally Posted by Spec_Ops2087,Apr 8 2009, 09:26 AM
It's the turbo. It's too small to hold peak boost all the way to redline...
pressure level in the intake manifold is at best only a partial indicator of mass flow. Mine holds 10psi and more all the way to redline and have had it as high as 12psi.
06-07-2009, 08:02 AM
#46
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Originally Posted by devs2k,Apr 8 2009, 10:33 AM
You can try tightening the wastegate actuator arm. In my Greddy setup, the arm was initially too lose and I'd hit 7.5 psi at 4000 rpm and drop down to 5.5 by redline. After tightening it, in summer/spring it'll hold 7.5 psi to redline.
During the winter, it jumps up to 10psi, but AFRs are in check.
No boost controller
During the winter, it jumps up to 10psi, but AFRs are in check.
No boost controller
My crack pressure (SPR) is set to 5.
Someone said an internal WG turbo can't hold boost - that's
. There are many many internal WG vehicles that hold much higher boost levels no problem. I'm not debating internal vs external WGs, just trying to clear out the typical that gets posted . . .. 
06-07-2009, 09:01 AM
#47
I have checked the plugs and they are good.
We have also blocked off the BOV and still no change.
We even removed the inter cooler and back flushed it with water.
We did some data logs and with the controller set to 50% duty cycle his car would barley hit 9.5 PSI and taper back down to 6.5-7PSI & on my car 30% was nearly 11.5 PSI. There is something wrong, I want to blame the intercooler piping b/c there are several places on his car that do not line up properly but I fear there is something bigger happening.
I still am at a loss with respect to the huge pressure drop which exists between the turbo and the TB.
There are only 4 explanations I can come up with, unless anyone else has measured or can measure the system pressure drop.
(1) There is an incredible amount piping losses
(2) The system is losing CFM and the turbo is running off of the curve trying to keep up with the demand
(3) The Throttle blade is bent or not opening all the way. (We have not checked doubt I dobt it)
(4) The engine is making some much power that the turbo can't keep up. (With having the kit on my car first and know how it ran this is very unlikely)
We have also blocked off the BOV and still no change.
We even removed the inter cooler and back flushed it with water.
We did some data logs and with the controller set to 50% duty cycle his car would barley hit 9.5 PSI and taper back down to 6.5-7PSI & on my car 30% was nearly 11.5 PSI. There is something wrong, I want to blame the intercooler piping b/c there are several places on his car that do not line up properly but I fear there is something bigger happening.
I still am at a loss with respect to the huge pressure drop which exists between the turbo and the TB.
There are only 4 explanations I can come up with, unless anyone else has measured or can measure the system pressure drop.
(1) There is an incredible amount piping losses
(2) The system is losing CFM and the turbo is running off of the curve trying to keep up with the demand
(3) The Throttle blade is bent or not opening all the way. (We have not checked doubt I dobt it)
(4) The engine is making some much power that the turbo can't keep up. (With having the kit on my car first and know how it ran this is very unlikely)
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