Chasing a boost spike, Forge Wastegate question

2500avalanche

2500avalanche

Well-known member
So I am trying to tune myself a bit as funds currently prevent me taking it to a person as originally intended. I still plan on taking to a person to tune in teh very near future, but I want to see what I can do myself.
I am having an. issue with initial boost spike once I hit the gas. Boost jumps to around 19# quickly and with it comes about 7 on the knock count and then goes to around 15# with less than 1 on the knock count. I have done a lot trying to get rid of the spike, but I am curious as I am running the Forge. I currently am bypassing the silonoid as directed. But, should I connect it to assist with the boost spike? Any hints would be welcome as I am at a loss...
 
Rexxenexx

Rexxenexx

Active member
I’m going through something similar now, just my ECU is reading the MAP sensor wrong in my case, causing premature cutoff.
For you, the only thing the solenoid can do is trick the actuator to hold that high boost spike longer. Without the solenoid the actuator is going strictly off the boost pushing on the spring inside itself (Do you know what spring you have?) and the actuator arm length to the wastegate lever. If you want to lower the peak boost you have two choices. Change the spring in the Forge actuator to a softer spring, or lengthen the actuator arm to the wastegate lever. Search “wastegate actuator adjustment“ and you’ll see what you can do there. It’s good also to know what spring is in your Forge actuator so you know what it’s meant to peak at.
 
S

Sy 0145

Member
2500avalanche said:
So I am trying to tune myself a bit as funds currently prevent me taking it to a person as originally intended. I still plan on taking to a person to tune in teh very near future, but I want to see what I can do myself.
I am having an. issue with initial boost spike once I hit the gas. Boost jumps to around 19# quickly and with it comes about 7 on the knock count and then goes to around 15# with less than 1 on the knock count. I have done a lot trying to get rid of the spike, but I am curious as I am running the Forge. I currently am bypassing the silonoid as directed. But, should I connect it to assist with the boost spike? Any hints would be welcome as I am at a loss...
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Sounds like you're not getting enough fuel at high boost. I would try increasing fuel to see if knock goes down at high boost. I run turbotweek chip with silonoid connected. I run 10 gallons of 93 and 2 gallons of 110 race gas and a quart of torco mixed with methanol injection at 25psi of boost with very little knock.
 
Sy2622

Sy2622

Member
Back down your timing until the knock is acceptable. Slowly work the pressure / timing up while data logging.
 
neildemo

neildemo

Administrator
The big question here is what size injectors and pump are you running? what's your PSI at the rail? You def need more fuel to eliminate knock, additionally Def would pull timing until you figure it out. There are many articles as to why you should not use a manual boost controller, the boost will change with weather. Your better off putting a 10psi spring in the forge, and reconnecting the wastegate solenoid. You can control the boost better with Turbo Tweak and will also pull boost if Knock occurs to a safe 10psi. My 2 cents....
 
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