What Rpm Does A Turbo Spin
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Discussion Starter · #1 ·
Hi Guys,
I have gotten so much help from this forum over the years. Every time I come here it feels like I am with very good friends.
Perhaps someone here would know how I can find some specifications on the stock Garrett turbo that was fitted to my 2000 f250 7.3L.
My question today is a little different. I have my stock turbo on the shelf from a major upgrade I did a few years ago.
I have a need to pressurize a very large chamber to around 25 to 30 psi. An air compressor would probably take days to fill it. I am thinking that the old turbo I have might fit the bill nicely.
My question is, how fast must I get the turbo to spin to achieve around 30 psi?
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I'm going to guess somewhere around 120,000 RPM.
Steve
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Garrett hides the specs for their turbos. But most turbos spin at 100,000 to 140,000 RPM, with 120,000 RPM being common. Here is a Garrett gauge that shows the speed of the turbine shaft:
http://www.turbobygarrett.com/turbobygarrett/images/Product_Overview/Face01.jpg
Our stock turbo is a Garrett GT38. The upgrade is a GTP38R. The "R" means ball bearings. So find the specs for either the GT38 or the GTP38R and you'll know the turbine shaft speed for max boost.
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Discussion Starter · #4 ·
Thanks guys,
Any guess what the CFM is at around 25 or 30 psi? That will tell me how long this blower will have to run to achieve pressure within the tank. It must be a tremendous amount. If I cannot find the specs, I will just try it and see.
Now I have to design a way to spin that turbo really, really, really fast. Perhaps a jet of steam, or air pressure from a Gas tank like nitrogen, or take the exhaust impeller off and run the shaft against a belt attached to a large flywheel on an electric motor. Any other ideas, or reasons to reject the above ideas?
Thanks
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What's the volume of the chamber?
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If you're using air to run the turbine, why not just use that air to pressurize, thus you'll avoid the efficiency loss in a turbo setup. Using air to push a turbine, to turn a shaft to spin a "fan" to compress air is a round about way to compress air.
If you want to spin the compressor wheel really fast, you'll need something like a router or other really high RPM motor with good torque.
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Discussion Starter · #7 ·
The tank is 2,000 gal. If I assume it is 1/3 full of water that leaves 1,400 Gal of space to pressurize. That amounts to about 180 cubic feet.
Of course you are right, using compressed air is silly, I was brainstorming as I was typing. I was thinking of perhaps a scuba tank full of air might work in loo of the turbo. But, then I would have to mess with getting bottles filled all the time.
Tim I like the router motor idea, high rpm, high torque, and I have an old one laying around I have not used in the last 10 years. I could put pulleys on the router and the turbo to get full rpm - therefore full boost. Perhaps I would need to put a variable speed power regulator on the motor to lighten its load as the turbo spools up. 130,000 or 140,000 rpm is really fast. A power regulator would give me control over the psi as well. I am also thinking they should all be enclosed in a steel box, in-case of a blow out!
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I still think that with the effort you are going to put into this turbo to get it to work, you could just plug in a decent air compressor and let it go to town.
If you do still do the turbo idea, you may want to think about keeping the bearings lubricated with oil.
Steve
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If you are going to use the turbo, your going to have to have someway to lube the bearings.
The tank is 2,000 gal. If I assume it is 1/3 full of water that leaves 1,400 Gal of space to pressurize. That amounts to about 180 cubic feet.
Thirty PSI in that size tank is a lot of pressure. Is your idea to make some kind of a pressure washer?
A tank with 1600 gallons of water would weigh 13280 lbs. plus the weight of the tank, a guess would be around 4000 lbs. The air in the tank would weigh approx. 14.5 lbs. which is negligible.
If your going to use it commercially it better be a certified air vessel.
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Discussion Starter · #10 ·
If you are going to use the turbo, your going to have to have someway to lube the bearings.
Thirty PSI in that size tank is a lot of pressure. Is your idea to make some kind of a pressure washer?
A tank with 1600 gallons of water would weigh 13280 lbs. plus the weight of the tank, a guess would be around 4000 lbs. The air in the tank would weigh approx. 14.5 lbs. which is negligible.
If your going to use it commercially it better be a certified air vessel.
Bill, Thank you for you reply. I have been considering the oil, but does this turbo have bearings? This turbo is my original stock. I replaced it with the GR38R which is touted as "having bearings", thus I assume this one must float on oil using bushings.
Pressure washer 
....no. The tank is rated for 30 psi, and it will not be used for any commercial use. It will sit on the ground, so weight is not a concern.
I think the only info I still am struggling to find is the approx. CFM of this turbo at max rpm. Once I have this number. I can determine how long this technique should take to fully charge. My guestimate is 3 min. which is much faster than a compressor.
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Okay, so what are you going to use this for? We're all curious!
From a purely technical perspective, you would be better off ditching the turbo and using a compressed gas tank w/a regulator to fill with (scuba tank or nitrogen). Would probably be as quick or quicker than the turbo.
From a gee whiz, look what I did perspective; I like your thinking. Would be cool if you can pull it off. Keep in mind that the closer you get to your target pressure, the faster the turbo CFM's will fall off (at the same RPM's). It'll take a lot longer to go the last 5 psi than it did the first 5.
Source: https://www.thedieselstop.com/threads/what-rpm-does-turbo-spin-for-its-max-psi.261845/
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