Not making boost with Magnuson any input???

[H-E]

Originally Posted by PIGSMOKR

Cams not the issue, it is a big cam it was in the motor before making 650rwhp before I cracked a piston. Now that we rebuilt the motor I added the 265cc heads that flow something like 380 cfm at 7.5. We've checked the valve but seems most of u think that's still it I'll have them recheck it again. I really appricate the feedback guys, thanks

My heads flow 390 cfm and with my 2300 I make 14lbs with a 454 and a 650ish cam, it's not your cam

[PIGSMOKR]

Just to say I had 3.2 pulley with this cam (in the pic) and full exhaust and stock tensioner on my car making 651rwhp and 609 ft lbs torque and had no issues of belt slip.

And we have confirmed the heads and cam just flow to much air. I have to install bigger pulleys in the back and 2.8 pulley in the front just to make any boost. Most likely gonna have to upgrade to pro charger cause I don't think the Maggie is gonna cut it.

Thanks for all the input

[PIGSMOKR]

Originally Posted by jvoisel

You can see the line here:

We plugged the hole cause we where trying to make it make boost.

[JANNETTYRACING]

Originally Posted by PIGSMOKR

Just to say I had 3.2 pulley with this cam (in the pic) and full exhaust and stock tensioner on my car making 651rwhp and 609 ft lbs torque and had no issues of belt slip.

And we have confirmed the heads and cam just flow to much air. I have to install bigger pulleys in the back and 2.8 pulley in the front just to make any boost. Most likely gonna have to upgrade to pro charger cause I don't think the Maggie is gonna cut it.

Thanks for all the input

There is NO Way the heads and cam flow that much you might lose 1 to 2 psi but no all of your boost.

Something else is wrong.

Ted.

[PIGSMOKR]

Can't find anything else. Techs from Magnuson and other places confirmed it. Boost is resistance and high flow motor don't have much resistance.

[BlkSlvrdo129]

Are you using LS7 heads or L92 heads? The PRC 265 heads are LS7 heads, and you would need an adapter plate to mate them to the TVS2300 because the port shapes are different. Without this plate there would be a boost leak.

Also you never answered what type of gauge you are using to see boost; if you are using an OBD based scan gauge, or using a live scan tuning software and you still have the OEM MAP sensor, you will never see boost pressure since the OEM sensor is only a 1 bar sensor (i.e., it only reads vacuum up to atmospheric pressure).

[JANNETTYRACING]

Originally Posted by PIGSMOKR

Can't find anything else. Techs from Magnuson and other places confirmed it. Boost is resistance and high flow motor don't have much resistance.

Not here to argue but you still should have some boost no matter how big your motor is.

Ted.

[PIGSMOKR]

No Texas speed made the custom ls3 casting for my car. And makes sense about the gauge to be honest I'm not even sure what kind it is. I know it's a glow shift and it mechanical boost gauge suppose to be for 2010 camaro. But not even going off the gauge the car makes no power and s/c makes no noise.

[PIGSMOKR]

I understand I appricate the feedback.

[PIGSMOKR]

More pics

[east TX Muscle cars]

Originally Posted by JANNETTYRACING

There is NO Way the heads and cam flow that much you might lose 1 to 2 psi but no all of your boost.

Something else is wrong.

Ted.

[old motorhead]

There's no LS motor, head, cam combo that won't show VERY noticeable boost with a 3.2" front pulley/1:1 rear pulley combo....if everything's right. Everything is not right in your setup. Plain and simple. If you want to sh!t can the blower and get a bigger one, go for it. It's your money.

Edit: Just saw the cam specs. That's by no means a huge blower cam. Healthy, yes.....bleeding all your boost, no way.

[1LESSPROBLEM]

You can shit can it down to me. Ill take it.

[ayousef]

dude, I said it in the previous page move the bypass valve with your hand, you can also easily see if it moves when there is vacuum in the intake manifold vs when the engine is shut (ie: no vacuum).

Also I hope you have the boost gauge connected to the manifold and NOT between the throttlebody and rotors because you will not see any boost there...

You're making the problem worse than it sounds by not listening to anyone's advice, Magnuson don't know what theyre saying if they told you you wont see any boost with an efficient motor. Yes you might not see any boost with a 5000ci motor and a 3.2 pulley in a 2300 blower, of course if such thing exists...