On board compressor used for boost? - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 12-13-2012, 04:35 AM Thread Starter
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On board compressor used for boost?

I am probably daydreaming about this idea but I would still like to share it. I have an early 99 manual 7.3 with a ts chip, 4" straight pipe, and k&n cai. The turbo lag is unbelievable and I can barely hit 23 psi.

Would it be possible to use an on board engine driven (or electric) compressor to fill a tank and route a line to the engine?

I know it would be impossible for it to keep up and feed the engine constantly, but if a regulator could be set for 10-15 psi during the times of no boost and assist in spooling up the turbo it could give more power at low rpm.

There would be obvious times where you wouldn't want the extra boost (idle or cruise) so it would be activated somehow by the waste gate position. (I dont know exactly how the 7.3 waste gate works but i work on aircraft and some use a throttle linkage to control the waste gate position, so maybe activate the compressed air by throttle position)

I'm probably missing a big flaw or two but I still wanted to throw it out there.

E1999 7.3 PS 6 Speed,TS 6 position chip. K&N CAI, 4" straightpipe, Auto Meter Elite gauges.
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post #2 of 8 Old 12-13-2012, 05:12 AM Thread Starter
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I think I answered my own question by finding the flaw.
If air is injected into the intake pre-turbo the air will just come out of the airfilter and escape into the atmosphere and have no effect.
If the air is injected after the turbo such as the intercooler, the air will not only go into the engine but also overcome the turbo and go backwards thru the system. Thus causing a compressor stall and causing the power (exhaust) impeller to also stall, creating massive back pressure in the exhaust and blowing the engine.

Does this sound correct?

E1999 7.3 PS 6 Speed,TS 6 position chip. K&N CAI, 4" straightpipe, Auto Meter Elite gauges.
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post #3 of 8 Old 12-13-2012, 09:15 AM
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Your pressure, say 100 psi in a 3/4 in pipe/hose won't give desired boost pressure on a 3 inch intake. You kinda need to think about the cfm part of it.

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post #4 of 8 Old 12-13-2012, 11:44 AM
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The CFM produced by turbo is dramaticlly higher than most compressor. For that kind of idea you would want a Blower run off a belt. This gets rid of turbo lag but is very un effecient in fuel usage compared to a turbo.
Now a dual turbo has been tried which gets rid of turbo lag. I think they run this on the new acert cat engines.
Also there is a aftermarket gadget you can get on ebay, which fools the computer, keeping the wastegate open slightly and gets rid of turbo lag.
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post #5 of 8 Old 12-14-2012, 12:34 AM
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Boost is a measure of restriction. The psi part of boost isn't what actually matters in making power, it's the cfm. You pack 1200cfm into the space where 600cfm was before the boost is going to be higher. A compressor would in no way flow enough cfm to make any difference.

And most of the stuff mentioned about getting rid of lag makes no sense at all. You can run a procharger feeding the turbo which gets rid of lag, you can also run compounds which can help reduce lag if everything is sized properly. On our trucks tho you need billet rods to run compounds.

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Last edited by dentexpowerstroke; 12-14-2012 at 12:37 AM.
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post #6 of 8 Old 12-15-2012, 05:10 AM
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It would be a lot more effective to figure out what is wrong with your turbo then to try and dump compressed air into it to help it spool.

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post #7 of 8 Old 12-15-2012, 08:42 AM
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On the other hand it is too bad the we don't have more boost pressures. One could tee into, say, the map line and fill an air tank with a check valve inline to run train horns and such....

Quote:
Originally Posted by bjs505 View Post
Of course I'm handy under the hood, I currently own a cummins.

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post #8 of 8 Old 12-15-2012, 08:52 AM
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need a supercharger that switches to turbo like Gale Banks has set up for the Military it's for marine use and had terrible out of the hole issues so He added the switchable supercharger ..


Just because I have a banner that states "Moderator"
does not mean you can't argue with my opinions !

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