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Honda-Tech - Honda Forum Discussion (https://honda-tech.com/forums/)
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-   -   Troubleshooting: B16 turbo has low boost pressure after installation & tuning.Causes? (https://honda-tech.com/forums/forced-induction-16/troubleshooting-b16-turbo-has-low-boost-pressure-after-installation-tuning-causes-3334955/)

fotis2000 03-14-2019 09:37 AM
Troubleshooting: B16 turbo has low boost pressure after installation & tuning.Causes?
 
Hi to all
I would like your opinion about my problem..
i have a B16a darton sleeves 81mm 9.0:1
gt 3582 billet wheel 0.63 a/r
ramhorn
44mm
80mm exhaust
ferrea valvetrain
T1 trigger with stand alone ecu and k20 coils
id 1050

at 13 psi makes 450 hp and when we start go up at 20 psi makes 480 and at 25 psi 475...
for sure is not normal this....
intake temperature was 80 f.
engine is fresh and very healthy.
any idea what happens???

Autoworks 03-14-2019 09:43 AM
re: Troubleshooting: B16 turbo has low boost pressure after installation & tuning.Causes?
 
Is this a Garrett 3582?

fotis2000 03-14-2019 09:44 AM
re: Troubleshooting: B16 turbo has low boost pressure after installation & tuning.Causes?
 
Yes Garrett 3582 and I have put billet wheel

Autoworks 03-14-2019 09:48 AM
re: Troubleshooting: B16 turbo has low boost pressure after installation & tuning.Causes?
 
If the motor is healthy then my first look would be the turbo not being up to par.

TheShodan 03-14-2019 10:35 AM
re: Troubleshooting: B16 turbo has low boost pressure after installation & tuning.Causes?
 
Originally Posted by Autoworks (Post 51887494)
If the motor is healthy then my first look would be the turbo not being up to par.
Exactly. Just because the compressor wheel used is made of billet grade aluminum, doesn't mean it's going to perform well. You were better offf keeping the turbo stock, if it is truly a Garrett

Balor_Gr 03-14-2019 10:55 AM
re: Troubleshooting: B16 turbo has low boost pressure after installation & tuning.Causes?
 
Did you test for air charge / exhaust leaks?
Its looks that the system uses much more power than its should to keep the asked boost target.
There a rare chance that you hook your wastegate vacccum line before the intercooler and the intercooler is getting maxed on flow/cfm
This way everything works great until you max the intercooler flow THEN it creates wall of restriction and you have like 35psi before the intercooler and 20 psi after it.

Are you sure the guy that did the turbo did a good job?

fotis2000 03-14-2019 11:07 AM
re: Troubleshooting: B16 turbo has low boost pressure after installation & tuning.Causes?
 
Originally Posted by Balor_Gr (Post 51887584)
Did you test for air charge / exhaust leaks?
Its looks that the system uses much more power than its should to keep the asked boost target.
There a rare chance that you hook your wastegate vacccum line before the intercooler and the intercooler is getting maxed on flow/cfm
This way everything works great until you max the intercooler flow THEN it creates wall of restriction and you have like 35psi before the intercooler and 20 psi after it.

Are you sure the guy that did the turbo did a good job?
boost leaks and intercooler test is the second test before try a different turbo.

motoxxxman 03-15-2019 04:33 AM
re: Troubleshooting: B16 turbo has low boost pressure after installation & tuning.Causes?
 
what fuel are you using?
The fuel alone could be the entire cause of this

Txdragon 03-15-2019 05:33 AM
re: Troubleshooting: B16 turbo has low boost pressure after installation & tuning.Causes?
 
Originally Posted by motoxxxman (Post 51888116)
what fuel are you using?
The fuel alone could be the entire cause of this
5hp loss within a 5psi boost increase.. Think maybe boost ignition correction could be affecting here?

fotis2000 03-15-2019 06:52 AM
re: Troubleshooting: B16 turbo has low boost pressure after installation & tuning.Causes?
 
Originally Posted by Txdragon (Post 51888222)
5hp loss within a 5psi boost increase.. Think maybe boost ignition correction could be affecting here?
100 Ron fuel.we try different ignition timing with no results...

motoxxxman 03-15-2019 03:34 PM
Re: B16 turbo low hp after boost
 
Originally Posted by fotis2000 (Post 51888349)
100 Ron fuel.we try different ignition timing with no results...
that might be why. You're at the edge of the knock limit of that fuel.

Does the car have a catalytic converter installed? Cats can be extremely restrictive, especially if they start to clog up

NVturbo 03-15-2019 04:29 PM
Re: Troubleshooting: B16 turbo has low boost pressure after installation & tuning.Cau
 
You nearly doubled the boost pressure and only gained 25HP? Something is definitely wrong...

fotis2000 03-16-2019 12:39 AM
Re: B16 turbo low hp after boost
 
Originally Posted by motoxxxman (Post 51889063)
that might be why. You're at the edge of the knock limit of that fuel.

Does the car have a catalytic converter installed? Cats can be extremely restrictive, especially if they start to clog up
No catalytic converter on the car...
the fuel is just perfect my friend for this set up until 600 hp at this dyno

Autoworks 03-16-2019 04:29 AM
Re: Troubleshooting: B16 turbo has low boost pressure after installation & tuning.Cau
 
... change the turbo

motoxxxman 03-16-2019 04:39 AM
Re: B16 turbo low hp after boost
 
Originally Posted by fotis2000 (Post 51889195)
No catalytic converter on the car...
the fuel is just perfect my friend for this set up until 600 hp at this dyno

100 RON is the same as 93 Ron+Mon/2 here in the states. And knock limit on our 93 occurs around 400hp-450hp on most hondas, some reach 475 and blow up soon thereafter

fotis2000 03-16-2019 06:33 AM
Re: B16 turbo low hp after boost
 
Originally Posted by motoxxxman (Post 51889206)

100 RON is the same as 93 Ron+Mon/2 here in the states. And knock limit on our 93 occurs around 400hp-450hp on most hondas, some reach 475 and blow up soon thereafter
100 Ron here (Europe) is 100ron not like USA

fotis2000 03-16-2019 06:43 AM
Re: Troubleshooting: B16 turbo has low boost pressure after installation & tuning.Cau
 
Originally Posted by Autoworks (Post 51889203)
... change the turbo
probably yes but why at 13 makes good power???if the turbo was but should make low power at lowest boost.

motoxxxman 03-16-2019 07:28 PM
Re: B16 turbo low hp after boost
 
Originally Posted by fotis2000 (Post 51889235)
100 Ron here (Europe) is 100ron not like USA
Yes, I am very aware of that. Which is why I'm glad you stated 100 Ron instead of just saying 100 octane.
Read what I said again:

Originally Posted by motoxxxman (Post 51889206)

100 RON is the same as 93 Ron+Mon/2 here in the states. And knock limit on our 93 occurs around 400hp-450hp on most hondas, Some reach 475 and blow up soon thereafter
The characteristics of USA 93 octane are the same as Europe's 100 octane, because they are exactly the same fuel. Meaning The same power figures apply to you. And is probably the reason you're not gaining any power as you raise the boost. To get over 450hp, you're going to need 105-110 Ron gas.

fotis2000 03-17-2019 12:51 AM
Re: B16 turbo low hp after boost
 
Originally Posted by motoxxxman (Post 51889459)
Yes, I am very aware of that. Which is why I'm glad you stated 100 Ron instead of just saying 100 octane.
Read what I said again:



The characteristics of USA 93 octane are the same as Europe's 100 octane, because they are exactly the same fuel. Meaning The same power figures apply to you. And is probably the reason you're not gaining any power as you raise the boost. To get over 450hp, you're going to need 105-110 Ron gas.
Not correct....
with 100 octane you can go very far...I have many examples my friend sorry...
my last set up with gt 3076 was 530hp at 26 psi...

Txdragon 03-17-2019 05:46 AM
Re: B16 turbo low hp after boost
 
Originally Posted by fotis2000 (Post 51889497)


Not correct....
with 100 octane you can go very far...I have many examples my friend sorry...
my last set up with gt 3076 was 530hp at 26 psi...
Different turbo, and also not experiencing a problem. I don't believe your fuel itself is an issue here. Is it possible? Yes. Is it PROBABLE? No. I'm leaning toward a restriction somehow, somewhere, but that's my thought. I had a similar issue once on an SR engine with the stock turbo. Turns out it was just pushed past its efficiency. Not saying that's your issue, but seems to be turbo related. Again, just my thoughts. :cheers:

ls joker 03-17-2019 11:15 AM
Re: Troubleshooting: B16 turbo has low boost pressure after installation & tuning.Cau
 
What size intercooler and what type of cams do you have again

fotis2000 03-17-2019 11:35 AM
Re: Troubleshooting: B16 turbo has low boost pressure after installation & tuning.Cau
 
Originally Posted by ls joker (Post 51889608)
What size intercooler and what type of cams do you have again
600/300/75
itr cams

Balor_Gr 03-17-2019 02:10 PM
Re: Troubleshooting: B16 turbo has low boost pressure after installation & tuning.Cau
 
Are you sure thats a .63 garrett housing? That behaviour is close to the back pressure
wall from a too small housing. I know tjere isnt a garrett .48 for the gt35 maybe something else?
Just saying.

fotis2000 03-17-2019 02:56 PM
Re: Troubleshooting: B16 turbo has low boost pressure after installation & tuning.Cau
 
Originally Posted by Balor_Gr (Post 51889658)
Are you sure thats a .63 garrett housing? That behaviour is close to the back pressure
wall from a too small housing. I know tjere isnt a garrett .48 for the gt35 maybe something else?
Just saying.
no balor for sure is 0.63...
maybe this week I will have news...I will try some things about ic and after turbo.

TheShodan 03-17-2019 04:48 PM
Re: Troubleshooting: B16 turbo has low boost pressure after installation & tuning.Cau
 
Originally Posted by Balor_Gr (Post 51889658)
Are you sure thats a .63 garrett housing? That behaviour is close to the back pressure
wall from a too small housing. I know tjere isnt a garrett .48 for the gt35 maybe something else?
Just saying.
Once again, we'll disagree. Most of my 650whp GT3582Rs run on .63A/R, and no back pressure issues. Difference between theory and actual use


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