Why oh why so little boost!!!??? :(
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Senior User
Joined: Sep 2009
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Why oh why so little boost!!!??? :(
thank you fellow IDI brotherhood members for opening my thread.
So here we go, I brought my truck over to FidyDiesel in Concord Ca. I have a 1994 7.3 with factory turbo with 190k miles with original injectors and IP.
I wanted to raise my boost to 13. So I installed a brand new Autometer boost gauge. After a few pulls, the boost showed that I maxed 5psi at factory settings.
We then proceeded to shorten the rod (for more boost) but the rod snapped in half. So then we had to get a brand new assembly and rod. After a few pulls, it stayed at 5. And finally we just said **** it, we ended up just wiring the wastegate totally shut. And we were fully aware that can spell disaster. And after a few final pulls, only PEAK 7 psi
Whats happening? I dont think there are any exaust or boost leaks. I have a KILLER homade cold air intake. What gives??
any thoughts/theorys would be greatly appricatied
So here we go, I brought my truck over to FidyDiesel in Concord Ca. I have a 1994 7.3 with factory turbo with 190k miles with original injectors and IP.
I wanted to raise my boost to 13. So I installed a brand new Autometer boost gauge. After a few pulls, the boost showed that I maxed 5psi at factory settings.
We then proceeded to shorten the rod (for more boost) but the rod snapped in half. So then we had to get a brand new assembly and rod. After a few pulls, it stayed at 5. And finally we just said **** it, we ended up just wiring the wastegate totally shut. And we were fully aware that can spell disaster. And after a few final pulls, only PEAK 7 psi
Whats happening? I dont think there are any exaust or boost leaks. I have a KILLER homade cold air intake. What gives??
any thoughts/theorys would be greatly appricatied
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
Two thoughs.
What are you running for exhaust?
How much is the fuel turned up?
The stock down pipe and exhaust system with a muffler will kill the boost.
Heat is also a required element to make boost.
What are you running for exhaust?
How much is the fuel turned up?
The stock down pipe and exhaust system with a muffler will kill the boost.
Heat is also a required element to make boost.
Senior User
Joined: Feb 2010
Posts: 443
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From: Bear, DE
thank you fellow IDI brotherhood members for opening my thread.
So here we go, I brought my truck over to FidyDiesel in Concord Ca. I have a 1994 7.3 with factory turbo with 190k miles with original injectors and IP.
I wanted to raise my boost to 13. So I installed a brand new Autometer boost gauge. After a few pulls, the boost showed that I maxed 5psi at factory settings.
We then proceeded to shorten the rod (for more boost) but the rod snapped in half. So then we had to get a brand new assembly and rod. After a few pulls, it stayed at 5. And finally we just said **** it, we ended up just wiring the wastegate totally shut. And we were fully aware that can spell disaster. And after a few final pulls, only PEAK 7 psi
Whats happening? I dont think there are any exaust or boost leaks. I have a KILLER homade cold air intake. What gives??
any thoughts/theorys would be greatly appricatied
So here we go, I brought my truck over to FidyDiesel in Concord Ca. I have a 1994 7.3 with factory turbo with 190k miles with original injectors and IP.
I wanted to raise my boost to 13. So I installed a brand new Autometer boost gauge. After a few pulls, the boost showed that I maxed 5psi at factory settings.
We then proceeded to shorten the rod (for more boost) but the rod snapped in half. So then we had to get a brand new assembly and rod. After a few pulls, it stayed at 5. And finally we just said **** it, we ended up just wiring the wastegate totally shut. And we were fully aware that can spell disaster. And after a few final pulls, only PEAK 7 psi
Whats happening? I dont think there are any exaust or boost leaks. I have a KILLER homade cold air intake. What gives??
any thoughts/theorys would be greatly appricatied
Theres your problem brotha.. Your not getting enough fuel. No fuel = no heat, no heat = no boost.
Senior User
Joined: Apr 2010
Posts: 262
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Didn't you say that you bought new sticks? Lets put them ****s in already and check your fuel pressure with the new sticks in. You got about 100k on your thermostat too, replace them ****s so the motor can warm up some and we might be in business
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Senior User
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Dave, thank you very much for your reply. I have an upgraded downpipe to 2.25" out the back to a straight pipe. I know its not the mighty 3", put its the best I can do with my factory housing. And the fuel is not turned up, the IP is still a virgin
ManicMike- Thank you as well for your reply. Ya man, looks like plain and simple.
Brian- Correct, I got the new sticks, IP, pyro, and intercooler. I was more excited then the first time i ever boned
Then unfortunately, last week, I had to sell them all I have been devastated yo. I came across some tough $$$ times of late, but will be back and ready to attack VERY soon. And yes, you have mentioned the stat
ManicMike- Thank you as well for your reply. Ya man, looks like plain and simple.
Brian- Correct, I got the new sticks, IP, pyro, and intercooler. I was more excited then the first time i ever boned
Then unfortunately, last week, I had to sell them all
I have been devastated yo. I came across some tough $$$ times of late, but will be back and ready to attack VERY soon. And yes, you have mentioned the stat
Logistics Pro
Joined: Sep 2007
Posts: 3,737
Likes: 179
From: Western Mass
My truck has ~201K on original pump and injectors. Last winter I put a ATS 093 kit on with the 3" downpipe connected to a 3.5" exhaust (with muffler) out of a powerstroke. Stock intake as well. I average from 5-7 PSI on the highway when unloaded. I'm not loaded often, and even then, the max I've seen is maybe 9 PSI. When I installed the turbo, I played with the wastegate a little with a brake bleeder vacuum/air pump. I don't remember what it was stock, but I did adjust it slightly higher, but doubt it gets close to those levels.
I'm pretty sure my problem is worn out pump and injectors, but since it still runs fine, I can't afford to replace them at this time. I was contemplating wrapping the up-pipe in header wrap, but don't know how much I'd need, and its not as cheap as I'd like either.
I'm just throwing this to compare my experience with yours. I had wondered why mine didn't perform like others, but have come to the realization that I need to put more $$ into the truck. The turbo did help though.
I'm pretty sure my problem is worn out pump and injectors, but since it still runs fine, I can't afford to replace them at this time. I was contemplating wrapping the up-pipe in header wrap, but don't know how much I'd need, and its not as cheap as I'd like either.
I'm just throwing this to compare my experience with yours. I had wondered why mine didn't perform like others, but have come to the realization that I need to put more $$ into the truck. The turbo did help though.
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Posting Guru
Joined: Dec 2009
Posts: 1,615
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From: Hagerstown, Md
just driving around and even on the highway i only run about 2-4 but the second i put the hammer down empty or hit a hill loaded ill hit 12-15
also i have 178k on my original pump (turned up though) and injectors, smashed down pipe to open exhaust and custom intake
also i have 178k on my original pump (turned up though) and injectors, smashed down pipe to open exhaust and custom intake
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Postmaster
Joined: Jun 2009
Posts: 3,420
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From: Maryland
same here and i have the crushed dp i can go more but i invested too much in the motor to pop a head gasket and its my dd so no downtime allowed
Lead Driver
Joined: Dec 2002
Posts: 5,491
Likes: 16
From: Kuna ID
Is the pump turned up at all? I'd closely inspect all the connections for signs of soot(easier to spot if turned up a few flats). Check the manifolds for cracks, the gaskets and the U-pipe connections. After I fixed all my leaks, I was amazed how much quicker I could build boost. If it still doesn't work for you than you probably dont have enough fuel.
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