Boost won't go past 18

[Braxton Jordt]

I just put a new cam in my car along with valve springs and lifters. It's running awesome and is way faster than it used to be. But even with my boost Controller tightened all the way the boost will only go to 18 pounds no further. Any ideas? Ta 49 turbo. Waste gate actuator is non adjustable

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[Bescurred]

You need an HD adjustable actuator. With a stock actuator and rjc controller I couldn't get above 20psi until I went HD...then I couldn't get it below 18 lol pick your poison

 

[Bescurred]

And that's a stick adjustable fyi...

 

[Braxton Jordt]

Before I did the cam and everything I was able to get 25 out of it and haven't changed anything. What's a stick adjustable?

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[Bescurred]

Stock it auto corrected on me

 

[Bescurred]

What style controller do you have?

 

[Braxton Jordt]

Rjc boost controller

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[Bescurred]

What else did you change other than cam?

Like I said with my stock adjustable and the Rjc controller I couldn't get more than 20 until I went to an HD.

 

[Braxton Jordt]

Valve springs and lifters. My old cam was about as flat as you could imagine. I'll get me an hd and hopefully that does the trick

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[Bescurred]

You're flowing more air now is my guess I really surprised ya push 24 psi with the Rjc controller alone.

 

[earlbrown]

I'd make sure you new cam isn't flat before buying wastegates.

As a goofy test, hang a throttle return spring on the stock wastegate and CAREFULLY see if it allows more boost. If it does, and your exhaust is sealed you can shim the spring in the boost controller.

 

[Braxton Jordt]

New cam has maybe 30 miles on it and I broke it in properly. I also sent the cam in to have it cryode (I believe that's how you spell it) and use zddp in all oil changes

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[earlbrown]

With 30 miles on the cam and a running condition, I'd have the dial indicator out checking cam lobes.

 

[Braxton Jordt]

I'm guessing it's not flat because it's 10 times faster at 18 pounds than it was with the flat cam at 25 pounds.

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[John Larkin]

Kind of like Earl said, you can restrict the opening of the actuator with an added spring or even clamp a small pair of vice-grips on the arm at the base of the canister - it can't move then. However your right foot will be the only boost control so you could see if that gets you above your current level. Just be real careful and prepared to let off the gas.

 

[RmvBfrFlght]

I'm guessing it's not flat because it's 10 times faster at 18 pounds than it was with the flat cam at 25 pounds.

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The turbo (TA49) may be at the limits of it's mass flow. You mention that the car is much faster, and with less restriction on the induction side the boost is lower. But it is moving more air at 18 psi then at 25 psi.

RemoveBeforeFlight

 

[Braxton Jordt]

I'm lost now haha

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[earlbrown]

Boost is just a measure of air the engine can't swallow. When you modify the engine it 'lets more air out of the intake plenum' so the boost reading for the same amount of air is lower.

 

[Braxton Jordt]

Put a brand new hd actuator on and boost went to 15. Boost controller all the way in and act rod all the way tight.

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[we4Mateo]

Put a brand new hd actuator on and boost went to 15. Boost controller all the way in and act rod all the way tight.

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Exhaust is missing the turbo somehow. Make sure the puck completely covers the hole. You had the DP off when you did the cam right? Puck may not be sealing properly now.