I installed a PPE Boost Valve on my LB7 and I'm happy with the results. I went from about 13 - 15 PSI @ WOT to about 19 - 20 PSI @ WOT. From my understanding the LB7 can safly boost about 30 PSI.

My question is - how about running two of these valves? For the money, you can't beat it. Any thoughts? If one is good; will two be great?

03' LB7 w/ Banks six pack
120,000 miles.
Stock turbo.
intake, exhust - the basics.

You need more fuel, not another boost valve.

what are you measuring boost with that sounds too low

x2. The boost valve just regulates how much pressure runs through the vaccum hose feeding the wastegate actuator. The more it restricts, the more boost. You could pinch off/plug the line and without other mods, you'll never reach 30lbs. And as far as max boost, I've heard anywhere between 34-39lbs is starting to push it. Consider a Banks big head. I just installed one and I'm quite pleased.

what are you measuring boost with that sounds too low

Banks gauges that came w/ the six pack. It's seems too low to me aswell. It was installed by a "pro"? Truck runs strong but EGT can reach 1300 (easily) hitting an on-ramp, so i think my gauges are correct. From my understanding; low boost = high EGT.

Those boost levels are low to me, mine hit 23-24 stock. With the Edge juice and a KD boost valve, I could hit 31 on level 6. EGT's sound right though. Where did they install the boost fitting, the waste gate line or the intake manifold?

I believe your truck should have 20 PSI stock...Might want to follow the boost line from the gauge to the source and make sure it's not kinked or has a hole in it...While you're under the hood, you can check the intercooler, turbo and intake connections...

x2. The boost valve just regulates how much pressure runs through the vaccum hose feeding the wastegate actuator. The more it restricts, the more boost. You could pinch off/plug the line and without other mods, you'll never reach 30lbs. And as far as max boost, I've heard anywhere between 34-39lbs is starting to push it. Consider a Banks big head. I just installed one and I'm quite pleased.

I too have a Bank's Big Head. I did not install myself so the preload my be off. To add preload, do i turn in or out? How may turns?

What additional mods would you recommend? I would like to maintain reliability.

Those boost levels are low to me, mine hit 23-24 stock. With the Edge juice and a KD boost valve, I could hit 31 on level 6. EGT's sound right though. Where did they install the boost fitting, the waste gate line or the intake manifold?

not sure, i'll check. Which would be more accurate?

I too have a Bank's Big Head. I did not install myself so the preload my be off. To add preload, do i turn in or out? How may turns

To get stock boost, you turn it in 6 or 7 turns...Shorten the rod 3 or 4 turns and check boost again...

x2. The boost valve just regulates how much pressure runs through the vaccum hose feeding the wastegate actuator. The more it restricts, the more boost. You could pinch off/plug the line and without other mods, you'll never reach 30lbs. And as far as max boost, I've heard anywhere between 34-39lbs is starting to push it. Consider a Banks big head. I just installed one and I'm quite pleased.


32 psi is the safe limit. Trust me, 39 and you will be changing a turbo. And that sucks.

I have only seen 23-24 after my install, but have only run my ppe on 120 over. In another post someone had written that it takes a pretty agressive tune (more fuel) to get more than that

I too have a Bank's Big Head. I did not install myself so the preload my be off. To add preload, do i turn in or out? How may turns?

What additional mods would you recommend? I would like to maintain reliability.


The shorter the rod-the more boost. As far as mods, start with the basics. Cold air intake, exhaust, and then a programmer. Reliability is not much of an issue as long as you don't go overboard-depending on your current amount of miles, of course.

Your big head is missadjusted. If you had a shop install it for you take it back to them. Ask them to let you watch so you can learn though :) You can also set your boost were ever you want it with the big head so you can ditch the PPE if you want. After you have a few more posts you can sell it here at our market place :D

There is a good post that is a sticky. Take a look at it and it may help you out a bit. If you have any questions after that post away :)

http://www.dieselplace.com/forum/showthread.php?t=122018