wastegate
Elder User
Joined: May 2004
Posts: 637
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From: Forest Hill, MD
I would still wait until you have some sort of airfilter upgrade. I also would not do it without a boost gauge. If you do decide to do it then remember 2 things, first, the computer will defuel the truck if the MAP sensor sees more then 25psi of boost, and second, Garrett the manufacturer of the stock turbo recommends the turbo not be spun past 25psi. The efficency map on the turbo runs out a little above 25psi anyway so you are not making any more power at that point just heat. I have mine setup with a boost tube to make a maximum of 27psi, but I rarely let it get above 23psi.
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
Originally Posted by 250jl
can you disconnect the wastegate in the 7.3l. my truck is an 03. ive heard about it before and wasnt sure if this was possible or not. also what do you gain from doing this?
Gains will be minimal, but should be noticable. By not allowing the wastegate to start opening at 5 psi you will build higher peak boost, and it will build boost faster.
Freshman User
Joined: Mar 2003
Posts: 37
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From: Flint, MI
I think I have to disagree with the last post. Disconnecting the waste gate will not allow you to build boost faster, it will only eliminate the safety valve designed to prevent over boost. It doesn't control boost at lower levels. Like PSDPower said, the factory turbo doesn't like to see boost #'s above 25 lbs. I would leave it connected for now.
My ball bearing turbo can produce 30 + lb of boost with my waste gate still connected.
Randy
My ball bearing turbo can produce 30 + lb of boost with my waste gate still connected.
Randy
Senior User
Joined: Feb 2004
Posts: 116
Likes: 0
I disconnected mine and have yet to overboost. The gains are minimal, but noticeable. Doesnt it defuel if it goes over 24 psi??? If that is the case, then even with it disconnected I have not gone past that.
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Elder User
Joined: May 2004
Posts: 637
Likes: 0
From: Forest Hill, MD
Actually it will build boost a little faster with it disconnected. The stock wastegate begins to open at about 5 psi and is fully open by about 17 psi, so bypassing the wastegate eliminates the pressure lost to the partially open wastegate. Without the loss of boost to the open wastgate, the turbo will spool a little quicker. You really need a little extra fuel to notice any gains from this mod.
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FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
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From: Cabot, Arkansas
Originally Posted by Ran440
Disconnecting the waste gate will not allow you to build boost faster, it will only eliminate the safety valve designed to prevent over boost. It doesn't control boost at lower levels.
Secondly, you are not eliminating any "safety valve". The wastegate will still open with the actuator unplugged. The only difference is it won't open until the boost pressure overcomes the spring pressure that is holding it shut.
No stock fueled PSD is capable of making more than 25 PSI with a wastegate or without, and the relatively mild power of 250jl's Hypertech still makes it pretty unlikely, and if it does happen to make more than 25 it's a simple matter of releasing some spring tension to set it wherever he likes. That, and it's going to defuel at 24 PSI, which makes the wastegate pretty much irrelevant.
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
Likes: 6
From: Cabot, Arkansas
Originally Posted by Ran440
It will not defuel if you us a pop off valve so the MAP sensor never sees more than 17 lbs of boost.
Randy
Randy
Junior User
Joined: Feb 2004
Posts: 57
Likes: 0
Originally Posted by Ran440
It will not defuel if you use a pop off valve so the MAP sensor never sees more than 17 lbs of boost.
Randy
Randy
HEY IS THERE ANY SAFE way to do this mod without over boosting. i mean will the sensors you guys are talking about defuel the truck IN TIME to eliminate over boosting or is there something else i can do to limit boost to say 23-24 psi , that is before it over boosts. the simpler the better! 
Posting Guru
Joined: Feb 2004
Posts: 2,248
Likes: 1
From: Elverson, PA
The truck defuels by itself to limit the boost. The zenier doide, pop off valve, or a regulator, are all used to defeat that stock de-fueling. The easiest way would be to leave it all alone and keep it stock. That being said....
I have a switch in my wastegate actuator line so I can turn it off easily with out crawling under the hood and reaching back to the turbo. I run around most of the time with the switch off (wastegate not working), but if I hook to a trailer, or know I'm gonna be doing some racing, I turn it on so that's one less gauge I'm trying to watch. I really like how quick my turbo spools up without the wastegate, but I can also peg my 35psi gauge real quick when I floor it. It sounds good - but I garantee you the turbo does not like it.
I have a switch in my wastegate actuator line so I can turn it off easily with out crawling under the hood and reaching back to the turbo. I run around most of the time with the switch off (wastegate not working), but if I hook to a trailer, or know I'm gonna be doing some racing, I turn it on so that's one less gauge I'm trying to watch. I really like how quick my turbo spools up without the wastegate, but I can also peg my 35psi gauge real quick when I floor it. It sounds good - but I garantee you the turbo does not like it.
