worth the purchase or no? sorry for asking a lot of dumb questions on the site, just trying to learn and find out as much as possible. tried using the search but didnt really come up with anything. thanks guys
? on PPE boost valve for lb7
- Thread starter 03GreenLB7
- Start date
i would say yes , you can just plug the wastgate boost hose but you have to watch your boost pressure because you can overspeed the turbo . i ran this way with no issues but others have said they ruined there turbos . probably better to by the boost valve and play it safe but i was cheap 
A boost pipe like PPE sells "fools" the wastegate into opening later. LB7 chargers do OK up to 32psi, but as go further the lifespan drops rapidly as you go higher. By the time you hit 40PSI, it's about 100% failure rate.
Most the big LB7 tunes will run more HP if you can turn the charger up to 30PSI or so, and are fueled accordingly.
Most the big LB7 tunes will run more HP if you can turn the charger up to 30PSI or so, and are fueled accordingly.
Trent
There were no boost valves back then. Stone age technology that works.
are you busy today i was going to call you today and pick your brain for a minute ?
ahh ok, soo better to go with some kind of tune like a EFI live tune, or say hand held tune that will also add fuel and what not, and not put me in any kind of danger with the failure of the turbo.
No, to get up past 26psi, you will need to do something. A Bank's BigHead, a boost pipe, BUT NOT VISEGRIPS@! Without something, you are leaving power on the table. While there is a bit more power to be had by going past 32, it becomes risky. Many run at 34psi and have mixed luck.
The PPE valve makes about 30 PSI if I remember correctly.
Without something, you are leaving power on the table. While there is a bit more power to be had by going past 32, it becomes risky. Many run at 34psi and have mixed luck.The PPE valve makes about 30 PSI if I remember correctly.
there have been quite a few people touching on 35-37 with certain tunes using the boost valve. I went with the kennedy's valve because its adjustable. So is the big-head wastegate, but its more of a pain.
Each truck/tune reacts differently to the valve. I believe its a safe, easy way for the norm of us to increase boost. I run it. I'm happy with it. I'm not hitting their peak numbers as advertised but like I said I believe it depends on each truck, tuning, elevation, etc etc. I'm at about 5200ft elevation and stock I went from 18-19 to about 21psi. With my tune I run at about 25 with peaks at 27. But DO NOT disconnect it! I'm on my second turbo due to that plus a leaky boost gauge
The Banks & BD wastegates have bigger diaphragms than the factory gate that will hold more pressure & prevent opening earlier. Example-if you have a IHI turbo on a bench, hook up an air hose to the wastegate line. Test 1 stock, gate opened at 2xpsi. Test 2 was with a crack pipe, gate opened later but was creeping open close to test 1.
i have one and i like it. with my economy tune i was running 19 psi and with the valve i am seeing 27 psi at wot... if i make a tune that will go over 30 psi my transmission will limp so with my stock tranny, i dont have a problem with over spinning my turbo
I've had two stock turbo's. The first one with the ppe boost valve. Ran well over 35 psi sustained, on ppe lv 10. Turbo lasted 3-5 months. The new turbo no boost valve and with the ppe lv10, mcrat and neens efi tunes I can peak 34-35 and sustain 32. With some of the bigger tunes now is it really needed?
I use the ppe valve too and haven't had any issues. When i had the bullydog power pup i couldn't really notice a difference with the valve but that was only a 90 hp tune i think. I've hit 35psi with it a few times but it normally peaks at 32psi.
i used to hit 32 with out a boost valve on a tune with lots of pw. but stopped running it cause the egts would climb real fast.
i run with a ppe valve, and better tuning and make about 33psi, and i got my boost valve reading map from somewhere else
i run with a ppe valve, and better tuning and make about 33psi, and i got my boost valve reading map from somewhere else
ahh ok, soo for 30 bucks, i think ill get it, but what im also picking up on is that im def going to need to get a boost gauge. to monitor my psi to make sure im not going crazy with the boost. and guess ill also get a egt gauge also
brace urself, another dumb question. if i get this valve and say a ppe programmer, what power levels could i go to before i would be looking at harm into the stock tranny?
brace urself, another dumb question. if i get this valve and say a ppe programmer, what power levels could i go to before i would be looking at harm into the stock tranny?