Boost problems
Hey all,
So I would like to start out by saying I am stumped, and I hope it is something really simple that I am over looking. I am having issues of not being able to maintain boost pressure. It's a tial v60 gate, Hallman MBC. I thought the spring pack that came with it was 12 psi, but it turned out to be 6 psi. So we changed the spring to a 15 psi spring. My problem and my confusion is this, even with a 6 psi spring, the boost controller should be able to hold more than the spring pressure, I read somewhere it should be able to hold 150 % of the spring pressure, which would've been around 9 psi. But that wasn't the case, it was only making 5-6 psi, we changed the spring to a 15 psi spring, and it made 15 psi even with the boost controller maxed out. So what am I doing wrong, do I not have enough manifold/line pressure on the wastegate diaphragm to keep the wastegate closed? The wastegate is setup with the source coming from post throttle body, to the MBC, to the side port of the wastegate, top of the wastegate is VTA. Do I need to go with an electric 3 port boost controller which would utilize both ports on the gate? Because shoving a socket in the wastegate to get some more psi out of it probably wasn't the best idea, she shot up to 27-28 psi real quick before blowing my coupler |
my .02: hallman comes with 2 springs. from my exp anything over 14-15psi and you need the heavier one. (the Subaru turbo's I usually tune have a 10psi wga).
Also a monster gate like that you probably want a larger than the standard 5/16 vac line. If you want it rock solid no matter what, time for a 4port mac valve and set up both ports |
Originally Posted by 18psi
(Post 1484276)
my .02: hallman comes with 2 springs. from my exp anything over 14-15psi and you need the heavier one. (the Subaru turbo's I usually tune have a 10psi wga).
Also a monster gate like that you probably want a larger than the standard 5/16 vac line. If you want it rock solid no matter what, time for a 4port mac valve and set up both ports |
haha, I'm genuinely scared just looking at your car. I thought its already tuned? I see it rippin around going 1000mph
Most/All modern standalones can control a 4port mac valve without any issue. But I'd try the spring first because its like 30 sec to swap. I have one too if you wanna borrow |
Originally Posted by 18psi
(Post 1484296)
haha, I'm genuinely scared just looking at your car. I thought its already tuned? I see it rippin around going 1000mph
Most/All modern standalones can control a 4port mac valve without any issue. But I'd try the spring first because its like 30 sec to swap. I have one too if you wanna borrow |
If holley has boost by gear or boost by speed, or any modern boost control, I'd say yes definitely. Even on my weaksauce 400hp Subaru I utilize this, I can only imagine how much helpful it would be on your nasty beast.
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Originally Posted by 18psi
(Post 1484317)
If holley has boost by gear or boost by speed, or any modern boost control, I'd say yes definitely. Even on my weaksauce 400hp Subaru I utilize this, I can only imagine how much helpful it would be on your nasty beast.
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So you are saying your wastegate signal is coming from the intake manifold which is post throttle body, correct?
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Originally Posted by sixshooter
(Post 1484705)
So you are saying your wastegate signal is coming from the intake manifold which is post throttle body, correct?
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Might wanna source pre-tb so you don't overspin the turbo at part throttle, though it's not a huge deal in your case either way.
(is your LS drive by wire?) |
I had the the biggest trouble with my ebc solenoid, and could not reliably calibrate it to hold boost correctly.
It shared the same vacuum line with my BOV using a Tee. I gave my BOV and EBC solenoid their own vacuum lines and problem solved. |
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