Any real advantage to aftrmrkt wastegate [Archive] - Diesel Place : Chevrolet and GMC Diesel Truck Forums

: Any real advantage to aftrmrkt wastegate


the freeze
11-04-2009, 08:22 PM
I've read All the bs from banks and bd but i want to hear from people that have tried them. I run the stock IHI turbo and push 24psi which is fine for me because I don't want any more boost from that little hair dryer in stock form. So is there any advantage at all to a different wastegate if I were to set it up to run at the same 24 psi max. Cause stock boost is fine till I get my TSS turbo

WI Huck
11-04-2009, 09:09 PM
The waste gate is a pressure relief valve. The factory one is set to the pressures you are seeing. The aftermarket ones like Banks use a larger spring and are adjustable for the maximum pressure you want to see, which is 32 PSI on your stock turbo. The larger spring will keep the gate shut tight up until the opening pressure. The smaller stock spring creeps open early and lets some boost out. If you are happy with stock then keep it stock.

JustinD
11-04-2009, 09:32 PM
I have a Banks Bighead, it made a big difference.

the freeze
11-04-2009, 10:45 PM
Wo wo wo happy with stock is there such a thing.
I'm just don't think raisin boost pressure is good for me I tow heavy all the time 15k and heat is not my friend since I'm sure it'll just raise my egt s with the stock turbo
so would there still be a benefit since it won't creep as you say

MattPark
11-05-2009, 03:18 AM
Boost creep is when the wastegate can't flow enough exhaust to keep the boost from rising further. The exhaust must go somewhere, and if it's through the turbine wheel, it will spin faster and the boost will rise. That's not a problem with stock LB7 turbos. I applications where it is an issue, a larger wastegate will cure the problem.

The stock LB7 wastegate spring relieves pressure around 22-24 psi. If you put a bleeder inline to the wastegate actuator (such as the PPE boost valve), it will drop the pressure the wastegate actuator sees (compared to actual boost in the intake manifold), and delay its opening, which increases intake boost pressure. The aftermarket actuators accomplish the same thing, but generally cost much more.

32 psi is generally accepted as the safe level for stock LB7 turbos, and up to that point they seem to decrease EGTs. Past 32 psi, turbo life is reduced dramatically, and there is no EGT benefit.

WI Huck
11-05-2009, 09:17 AM
Heat is made from burning fuel. More boost does not make heat unless you are making lots of black smoke which is too much fuel and not enough air. To reduce heat you need more air flow through the engine to carry the heat away. That is why an exhaust system does such a good job at lowering EGT's. More boost will help you not hurt you when towing to keep temps down.

cwq21
11-05-2009, 09:25 AM
I installed the PPE boost valve and run 28-29 (on gauge) regularly when towing with no problems. The only EGT problem I had was with the Predator programmer. Went back to my Hypertech and EGT's are good again.