01 cummins plenty of fuel, plenty of air won't pass 33psi. Help - Dodge Cummins Diesel Forum
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post #1 of 11 (permalink) Old 09-20-2019, 10:38 PM Thread Starter
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01 cummins plenty of fuel, plenty of air won't pass 33psi. Help

I have 2001 Dodge cummins with few good mods. 150 airdog, air intake, edge juice with attitude hot unlock, 5" turbo back straight pipe exhaust, air ram intake. With stock turbo was pushing 35 to 36 psi. Fantastic. Later, decided to upgrade turbo to a fleece cheetah which is a 63mm turbo which was supposed to increase boost significantly. Installed it with high expectations, but was greatly disappointed. At this moment, turbo doesn't pass 33psi. I did everything I can think of. Maxed out wastegate, put boost elbow with pin hole, modified other boost elbow drilled hole and put screw in, totally bypassing wastegate with no improvements. I can't pass 33 pounds of boost. What can I do?

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post #2 of 11 (permalink) Old 09-20-2019, 10:45 PM
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First thing I would check is for a boost leak...especially after just cracking open that piping and suddenly having a boost issue.

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post #3 of 11 (permalink) Old 09-20-2019, 11:18 PM
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I dont see any injectors in your list?

If you are still running stock injectors then I wouldn't expect any more boost.

You are signficantly under fueled if you are still running stock injectors.
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post #4 of 11 (permalink) Old 09-21-2019, 12:51 AM
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Quote:
Originally Posted by Jmorillo View Post
I have 2001 Dodge cummins with few good mods. 150 airdog, air intake, edge juice with attitude hot unlock, 5" turbo back straight pipe exhaust, air ram intake. With stock turbo was pushing 35 to 36 psi. Fantastic. Later, decided to upgrade turbo to a fleece cheetah which is a 63mm turbo which was supposed to increase boost significantly. Installed it with high expectations, but was greatly disappointed. At this moment, turbo doesn't pass 33psi. I did everything I can think of. Maxed out wastegate, put boost elbow with pin hole, modified other boost elbow drilled hole and put screw in, totally bypassing wastegate with no improvements. I can't pass 33 pounds of boost. What can I do?
Fell for the online deezul rackets.

You can't make more boost without more fuel. I'd order a set of 7x.010" injectors, and in the mean time pressurize the system and check for boost leaks, just because that's good preventative maintenance.
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post #5 of 11 (permalink) Old 09-21-2019, 08:12 AM Thread Starter
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I don't think I have a boost leak but I'll check it out. What I don't understand is that I made more boost with stock turbo. I was gonna get injectors but wanted to ask first before spending more money and hope it fixes it. Im also getting new boots.
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post #6 of 11 (permalink) Old 09-21-2019, 11:57 AM
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The stock turbo is smaller, it takes less fuel to spin.

A bigger turbo will make less boost unless you asdd fuel.


Also boost and cfm are different. A biggr turbo will flow more cfm of air at a given psi than a smaller turbo.
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post #7 of 11 (permalink) Old 09-21-2019, 04:44 PM Thread Starter
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Ok. Injectors it is. Which injectors would y'all recommend to reach upwards of 40psi?
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post #8 of 11 (permalink) Old 09-21-2019, 06:04 PM
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Why are you stuck on psi? Create power goals, psi is not important.


Generally 7 x .010's are the most widely used vp injector on a street driven truck.
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post #9 of 11 (permalink) Old 09-21-2019, 08:13 PM Thread Starter
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I word it wrong. Which injectors is recommended for this specific turbo to perform it's best. I'm not gonna do much more to this truck. I just want everything that I've done to it be performing as they should. Big power gains are not on my mind at the moment. In the future I might run a different setup.
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post #10 of 11 (permalink) Old 09-22-2019, 09:34 PM
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Quote:
Originally Posted by me78569 View Post
Why are you stuck on psi? Create power goals, psi is not important.


Generally 7 x .010's are the most widely used vp injector on a street driven truck.
Either go to a dyno or a good straight Test Hill to try yer stuff,


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post #11 of 11 (permalink) Old 09-28-2019, 12:11 AM
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That turbo is probably flowing more air at 30 PSI than your stock one did at 35 PSI.
The stock one is making more heat than actual flow past about 32 or so.

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In the near future Iím ripping out all the electronic junk and P-pumping it.
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